Case 1 Strength Analysis of Engine Mounting Bracketweb.mscsoftware.com/support/online_ex/Scenario/Case/case1_1a.pdf · Jobname : case1 Solution Type ===> Click Solution Type : Linear

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Case 1: Strength Analysis of Engine Mounting Bracket

ABSTRACT: The purpose of an engine mounting bracket is to safely support the power-traintem in all conditions. Since it is very difficult to change the supporting locations and types ofport after the engine is built, the mounting brackets must be verified in the design stage.The engine mounting connects the engine to the body. If the mounting bracket does noappropriate stiffness,it can cause noise and vibration. This vibration is passed from the moto the body causing body vibration. A weak bracket can also lead to rolling vibration of the enor shock from deceleration and accelleration. Due to these factors, it is very important thaengine mounting bracket have enough stiffness and strength.Strength analysis needs to be performed to verify the bracket properties early in the designThe strength analysis computes the magnitude of a load from the mass of the engine, inclufactor of safety, and applies this load to each engine mounting bracket. The stress analysisfomed with these boundary conditions and the analyst verifies that results are within an accerange..

Solution Type : SOL101 Linear Static Analysis

< Model Geometry >

58

tion

irec-

n of

Calculate the magnitude of loading before being applied.

Even if the component of load in the vertical direction is already known as 450 Kgf, the direc

of the actual force is not vertical direction of the cylinder but fifteen degrees in right and left d

tion with respect to the vertical axis. Therefore, their components, F, should be calculated.

2 F cos 15o = 450

F = 450 / (2 cos 15 o) = 232.935

This F is not applied to one point but applied evenly to eleven nodes existing in the directio

length of the cylinder.

Force per grid point : 232.935/11 = 21.176

Create the cylindrical coordinate in the origin to apply loads easily.

υGeometry | Create | Coord | Euler

Type : Cylindrical

X-axis : 90o

Y-axis : 0 o

Z-axis : 0 o.

The directrion of thecoordinate is;

113

Post the cylindrical part only to apply loads easily.

Group|Post... Select Groups to Post : select the circle only.

Apply

Edit the load conditions.

◆ Loads / BCs

Create | Force | Nodal

New Set Name : Force 1

Input Data....==> Click.

Force < F1 F2 F3 > : < 21.176, , >

Analysis Coordinate Frame : Coord 2

OK

Select Application Region....

Geometry Filter

◆ FEM

Application Region

Select Nodes

Node 734 776 927:993:22 1023:1111:22 1142:1152

Add

Ok

Apply

114

Check that loads are applied correctly.

◆ Loads/BCs

Plot Markets Assigned Load/BC Sets

Force_Force1

Apply

115

itions

MSC/

e

file of

it is

The second step : Solution

1. Creating input file for MSC/NASTRAN

Until now, the model was completed with elements and nodes and load and boundary cond

were defined.

Therefore, all data necessary for the analysis are prepared. Input data necessary to perform

NASTRAN will be generated in this step.

◆ Analysis

Analyze | Entire Model | Analysis Deck

Jobname : case1

Solution Type ===> Click

Solution Type :◆ Linear Static

Ok

Apply===>Input file named case1.bdf is created in th

current directory.

The extension of the file name named as case1.bdf, .bdf, means that the file is the bulk data

MSC/NASTRAN.

The created input file named case1.bdf can be performed by MSC/NASTRAN. However,

desirable to check always whether the input file is created according to analysts intention.

116

/PAT-

Editor, a general command, is used to check the input file.

> vi case1.bdf

<The summary of the content of case1.bdf file>

SOL 101 =============> the type of a linear static structural analysis

TIME 600

CEND

SUBCASE 1

SPC = 2 ===============> register the constraints

LOAD = 2 ===============> register the load condition

OLOAD=ALL ===============> print the summation of applied loads (edit seperately)

DISP=ALL ===============> print displacements of all grid points

SPCF=ALL ===============> print the reaction forces on constrained points

STRESS=ALL ===============> print stresses of all elements

BEGIN BULK

PARAM POST -1 ===============> request to create case1.op2 for post-processing with MSC

RAN

$ Direct Text Input for Bulk Data

$ Elements and Element Properties for region : thick3.2

PSHELL 2 1 3.2 1 =============>check the element property

CQUAD4 1 2 3 23 22 1

CQUAD4 2 2 4 24 23 3

CQUAD4 3 2 5 25 24 4

CQUAD4 4 2 6 26 25 5

CQUAD4 5 2 7 27 26 6

CQUAD4 6 2 8 28 27 7

CQUAD4 7 2 9 29 28 8

CQUAD4 8 2 11 29 9 2

CQUAD4 9 2 15 12 10 13

CQUAD4 10 2 15 29 11 12

CQUAD4 11 2 16 28 29 15

.

.

.

CQUAD4 1309 2 1332 990 968 1331

117

CQUAD4 1310 2 1333 1012 990 1332

CQUAD4 1311 2 1334 871 1012 1333

CQUAD4 1312 2 1335 1042 871 1334

CQUAD4 1313 2 1336 1064 1042 1335

CQUAD4 1314 2 1337 1086 1064 1336

CQUAD4 1315 2 1338 1108 1086 1337

CQUAD4 1316 2 1339 1130 1108 1338

$ Referenced Material Records

$ Material Record : steel

MAT1 1 20700. .3 =======================> check the material property

$ Nodes of the Entire Model

GRID 1 8.30000 86.8000 87.0000

GRID 2 8.29999 86.8000 42.3951

GRID 3 8.30000 86.8000 81.4244

GRID 4 8.30000 86.8000 75.8488

GRID 5 8.30000 86.8000 70.2731

GRID 6 8.3 86.8000 64.6975

GRID 7 8.3 86.8000 59.1219

GRID 8 8.29999 86.8000 53.5463

GRID 9 8.29999 86.8000 47.9707

GRID 10 8.29999 66.7999 42.3951

GRID 11 8.29999 80.1333 42.3951

.

.

.

GRID 1335 -42.6229 4.30000-7.03834

GRID 1336 -42.6229 9.80000-7.03834

GRID 1337 -42.6229 15.3000-7.03834

GRID 1338 -42.6229 20.8000-7.03834

GRID 1339 -42.6228 26.0000-7.03834

$ Loads for Load Case : Default

SPCADD 2 1 3 =========> the constraint registered in SUBCASE1 as SPC=2

LOAD 2 1. 1. 1 =========> the load condition registered in SUBCASE1 as LOAD=2

118

$ Displacement Constraints of Load Set : all_fix

SPC1 1 123456 158 THRU 181

$ Displacement Constraints of Load Set : tz_fix

SPC1 3 3 351 THRU 374

$ Nodal Forces of Load Set : Force1

FORCE 1 734 2 21.716 1. 0. 0.

FORCE 1 776 2 21.716 1. 0. 0.

FORCE 1 927 2 21.716 1. 0. 0.

FORCE 1 949 2 21.716 1. 0. 0.

FORCE 1 971 2 21.716 1. 0. 0.

FORCE 1 993 2 21.716 1. 0. 0.

FORCE 1 1023 2 21.716 1. 0. 0.

FORCE 1 1045 2 21.716 1. 0. 0.

FORCE 1 1067 2 21.716 1. 0. 0.

FORCE 1 1089 2 21.716 1. 0. 0.

FORCE 1 1111 2 21.716 1. 0. 0.

FORCE 1 1142 2 21.716 1. 0. 0.

FORCE 1 1143 2 21.716 1. 0. 0.

FORCE 1 1144 2 21.716 1. 0. 0.

FORCE 1 1145 2 21.716 1. 0. 0.

FORCE 1 1146 2 21.716 1. 0. 0.

FORCE 1 1147 2 21.716 1. 0. 0.

FORCE 1 1148 2 21.716 1. 0. 0.

FORCE 1 1149 2 21.716 1. 0. 0.

FORCE 1 1150 2 21.716 1. 0. 0.

FORCE 1 1151 2 21.716 1. 0. 0.

FORCE 1 1152 2 21.716 1. 0. 0.

$ Referenced Coordinate Frames

CORD2C 2 0. 0. 0. 0. 0. 1. + N =====> the coordinate to be used to apply the load

+ N-4.37-8 1. 0.

ENDDATA ==================================================> the end of input file

119

10

ay

due to

verify

2. Checking the result file after running and executing MSC/NASTRAN

After checking the input file, perform MSC/NASTRAN.

❏ nastran case1.bdf

First of all, check whether there are fatal errors, and whether the value of epsilon is less than-6.

If the value of epsilon is greater than 10-6, then analyst should check the model because there m

be unstable factors. In other words, check up duplicate nodes, duplicate elements, a hinge

the difference of DOF, etc. Also, after checking the external forces and the reaction forces,

that magnitude of a displacement is in the linear region.

>vi case1.f06

< the summary of the content of case1.f06 file >

SOL 101

TIME 600

$ DIRECT TEXT INPUT FOR EXECUTIVE CONTROL

CEND

0

0 C A S E C O N T R O L D E C K E C H O

CARD

COUNT

1 SEALL = ALL

2 SUPER = ALL

3 TITLE = MSC/NASTRAN JOB CREATED ON 24-SEP-97 AT 17:45:10

4 ECHO = NONE

5 MAXLINES = 999999999

6 $ DIRECT TEXT INPUT FOR GLOBAL CASE CONTROL DATA

7 SUBCASE 1

8 $ SUBCASE NAME : DEFAULT

9 SUBTITLE=DEFAULT

10 SPC = 2

120

08

121

11 LOAD = 2

12 OLOAD=ALL

13 DISPLACEMENT(SORT1,REAL)=ALL

14 SPCFORCES(SORT1,REAL)=ALL

15 STRESS(SORT1,REAL,VONMISES,BILIN)=ALL

16 BEGIN BULK

0 INPUT BULK DATA CARD COUNT = 2651

0 TOTAL COUNT= 2640

0 OLOAD RESULTANT

0 T1 T2 T3 R1 R2 R3

0 1 4.4601184E+02-5.2275796E+00 0.0000000E+00 8.3786901E-04 -2.4100974E-02 -1.9632772E-13

LOAD SEQ. NO. EPSILON EXTERNAL WORK EPSILONS LARGER THAN .001 ARE FLAGGED WITH ASTERISKS

1 -2.6157543E-13 1.0322804E+02

0 SPCFORCE RESULTANT

0 T1 T2 T3 R1 R2 R3

0 1 -4.4601184E+02 5.2275796E+00 1.0044232E-10 -8.3787105E-04 2.4100967E-02 -1.2557186E-

0

D I S P L A C E M E N T V E C T O R

POINT ID. TYPE T1 T2 T3 R1 R2 R3

1 G -3.388117E-02 5.967543E-04 -3.476353E-04 -1.073203E-04 -8.464418E-04 5.435654E-04

2 G 1.705256E-03 -1.505788E-04 -2.252729E-04 .0 -9.692291E-05 -8.521343E-05

3 G -2.778594E-02 4.691521E-04 -3.199295E-04 .0 -1.257081E-03 5.270182E-04

4 G -2.004636E-02 3.697563E-04 -3.162545E-04 .0 -1.401420E-03 4.542482E-04

5 G -1.228214E-02 2.594843E-04 -3.140836E-04 .0 -1.249428E-03 3.532296E-04

6 G -6.052270E-03 1.463794E-04 -2.931711E-04 .0 -8.780626E-04 2.108079E-04

7 G -2.046922E-03 5.145672E-05 -2.621209E-04 .0 -4.982703E-04 1.010211E-04

8 G 6.992900E-05 -1.912706E-05 -2.384312E-04 .0 -2.477344E-04 -1.501670E-06

9 G 1.108005E-03 -8.286034E-05 -2.268947E-04 .0 -1.220527E-04 -6.036313E-05

10 G 7.732020E-04 -1.197503E-04 1.196657E-06 .0 -1.116166E-04 1.617573E-04

11 G 1.064274E-03 -1.464049E-04 -1.380086E-04 .0 -5.197330E-05 -9.569000E-05

12 G 4.626031E-04 -1.306775E-04 -5.964141E-05 .0 -5.272346E-05 -3.611754E-05

0 SUBCASE 1

L O A D V E C T O R


734 G 1.936063E+01 -9.836187E+00 .0 .0 .0 .0

776 G 2.170703E+01 -6.242449E-01 .0 .0 .0 .0

927 G 1.843098E+01 -1.148406E+01 .0 .0 .0 .0

949 G 1.993994E+01 -8.601365E+00 .0 .0 .0 .0

971 G 2.097365E+01 -5.629444E+00 .0 .0 .0 .0

993 G 2.159627E+01 -2.277220E+00 .0 .0 .0 .0

1023 G 2.160161E+01 2.226015E+00 .0 .0 .0 .0

1045 G 2.114079E+01 4.965018E+00 .0 .0 .0 .0

1067 G 2.038867E+01 7.475735E+00 .0 .0 .0 .0

1089 G 1.943528E+01 9.687855E+00 .0 .0 .0 .0

1111 G 1.843098E+01 1.148406E+01 .0 .0 .0 .0

1142 G 1.843103E+01 -1.148398E+01 .0 .0 .0 .0

1143 G 1.936065E+01 -9.836150E+00 .0 .0 .0 .0

1144 G 1.993995E+01 -8.601331E+00 .0 .0 .0 .0

1145 G 2.097367E+01 -5.629372E+00 .0 .0 .0 .0

1146 G 2.159627E+01 -2.277204E+00 .0 .0 .0 .0

1147 G 2.170703E+01 -6.242368E-01 .0 .0 .0 .0

1148 G 2.160161E+01 2.226004E+00 .0 .0 .0 .0

1149 G 2.114080E+01 4.964996E+00 .0 .0 .0 .0

1150 G 2.038869E+01 7.475703E+00 .0 .0 .0 .0

1151 G 1.943530E+01 9.687818E+00 .0 .0 .0 .0

1152 G 1.843101E+01 1.148402E+01 .0 .0 .0 .0

SUBCASE 1

F O R C E S O F S I N G L E - P O I N T C O N S T R A I N T


122

E+00

80E-01

2

7 G .0 .0 .0 2.166371E-06 .0 .0

8 G .0 .0 .0 -3.478547E-06 .0 .0

14 G .0 .0 .0 2.914168E-05 .0 .0

16 G .0 .0 .0 9.358940E-06 .0 .0

17 G .0 .0 .0 -2.637488E-05 .0 .0

27 G .0 .0 .0 3.833955E-06 .0 .0

28 G .0 .0 .0 -2.963803E-06 .0 .0

30 G .0 .0 .0 8.032917E-21 .0 .0

34 G .0 .0 .0 -1.770970E-06 .0 .0

39 G .0 .0 .0 3.382080E-05 .0 .0

0 SUBCASE 1

S T R E S S E S I N Q U A D R I L A T E R A L E L E M E N T S ( Q U A D 4 ) OPTION = BILIN

ELEMENT FIBRE STRESSES IN ELEMENT COORD SYSTEM PRINCIPAL STRESSES (ZERO SHEAR)

ID GRID-ID DISTANCE NORMAL-X NORMAL-Y SHEAR-XY ANGLE MAJOR MINOR VON MISES

0 1 CEN/4 -1.600000E+00 -3.718809E-01 -2.568718E+00 2.515556E-02 .6560 -3.715929E-01 -2.569006E+00 2.404839

1.600000E+00 3.717893E-01 2.608708E+00 3.783849E-02 89.0312 2.609348E+00 3.711494E-01 2.444993E+00

3 -1.600000E+00 -4.847836E-01 -2.689847E+00 2.515556E-02 .6535 -4.844967E-01 -2.690134E+00 2.483586E+00

1.600000E+00 3.408120E-01 2.439261E+00 3.783849E-02 88.9673 2.439943E+00 3.401299E-01 2.288911E+00

23 -1.600000E+00 -4.291624E-01 -2.495634E+00 2.515556E-02 .6973 -4.288563E-01 -2.495940E+00 2.311544E+00

1.600000E+00 4.489827E-01 2.797545E+00 3.783849E-02 89.0772 2.798155E+00 4.483733E-01 2.603092E+00

22 -1.600000E+00 -2.626563E-01 -2.454165E+00 2.515556E-02 .6576 -2.623676E-01 -2.454453E+00 2.334354E+00

1.600000E+00 3.999416E-01 2.767264E+00 3.783849E-02 89.0845 2.767869E+00 3.993370E-01 2.591381E+00

1 -1.600000E+00 -3.145123E-01 -2.636364E+00 2.515556E-02 .6207 -3.142398E-01 -2.636637E+00 2.494406E+00

1.600000E+00 2.983108E-01 2.430919E+00 3.783849E-02 88.9838 2.431590E+00 2.976396E-01 2.297277E+00

0 2 CEN/4 -1.600000E+00 -8.626834E-02 -7.314132E-01 -1.397349E-01 -11.7109 -5.730297E-02 -7.603786E-01 7.3340

1.600000E+00 4.526021E-02 7.575784E-01 1.414459E-01 79.1699 7.846376E-01 1.820105E-02 7.756972E-01

4 -1.600000E+00 -3.429305E-01 -9.712070E-01 -1.397349E-01 -11.9902 -3.132538E-01 -1.000884E+00 8.86775E-01

1.600000E+00 3.053080E-01 9.331093E-01 1.414459E-01 77.8717 9.635058E-01 2.749115E-01 8.596749E-01

123

8

8

Y

24 -1.600000E+00 -2.279778E-01 -6.168498E-01 -1.397349E-01 -17.8518 -1.829744E-01 -6.618532E-01 5.91968E-01

1.600000E+00 2.314744E-01 7.193519E-01 1.414459E-01 74.9465 7.573937E-01 1.934326E-01 6.815841E-01

23 -1.600000E+00 1.702557E-01 -4.873516E-01 -1.397349E-01 -11.5123 1.987162E-01 -5.158121E-01 6.38783E-01

1.600000E+00 -2.138885E-01 5.797360E-01 1.414459E-01 80.1906 6.041919E-01 -2.383445E-01 7.522379E-01

3 -1.600000E+00 5.926153E-02 -8.511710E-01 -1.397349E-01 -8.5323 8.022559E-02 -8.721350E-01 9.148897E-01

1.600000E+00 -1.463379E-01 7.979878E-01 1.414459E-01 81.6617 8.187191E-01 -1.670692E-01 9.137811E-01

* * * * A N A L Y S I S S U M M A R Y T A B L E * * * *

SEID PEID PROJ VERS APRCH SEMG SEMR SEKR SELG SELR MODES DYNRED SOLLIN PVALID SOLNL LOOPID DESIGN CYCLE SENSITIVIT

--------------------------------------------------------------------------------------------------------------------------

0 0 1 1 ' ' T T T T T F F T 0 F -1 0 F

SEID = SUPERELEMENT ID.

PEID = PRIMARY SUPERELEMENT ID OF IMAGE SUPERELEMENT.

PROJ = PROJECT ID NUMBER.

VERS = VERSION ID.

APRCH = BLANK FOR STRUCTURAL ANALYSIS. HEAT FOR HEAT TRANSFER ANALYSIS.

SEMG = STIFFNESS AND MASS MATRIX GENERATION STEP.

SEMR = MASS MATRIX REDUCTION STEP (INCLUDES EIGENVALUE SOLUTION FOR MODES).

SEKR = STIFFNESS MATRIX REDUCTION STEP.

SELG = LOAD MATRIX GENERATION STEP.

SELR = LOAD MATRIX REDUCTION STEP.

MODES = T (TRUE) IF NORMAL MODES OR BUCKLING MODES CALCULATED.

DYNRED = T (TRUE) MEANS GENERALIZED DYNAMIC AND/OR COMPONENT MODE REDUCTION PERFORMED.

SOLLIN = T (TRUE) IF LINEAR SOLUTION EXISTS IN DATABASE.

PVALID = P-DISTRIBUTION ID OF P-VALUE FOR P-ELEMENTS

LOOPID = THE LAST LOOPID VALUE USED IN THE NONLINEAR ANALYSIS. USEFUL FOR RESTARTS.

SOLNL = T (TRUE) IF NONLINEAR SOLUTION EXISTS IN DATABASE.

DESIGN CYCLE = THE LAST DESIGN CYCLE (ONLY VALID IN OPTIMIZATION).

SENSITIVITY = SENSITIVITY MATRIX GENERATION FLAG.

1 * * * END OF JOB * * *

************************************************************************************

124

g

The thir d step : Post-processing (Verifying the results)

If verifying the text results is done, then read case1.op2 in PATRAN.

υAnalysis

Read Output2 | Resulties | Translate Select Result File... ===> Click

Select Result File : case1.op2 ===> select via clickin

OK

Apply

Display the deformed shape.

Group | Create... New Group Name : all_fem

Since result post is in the current group, Make Current

do group FEM only. Unpost All Other Groups

Group Contents : Add All FEM

Apply

◆ Results | Basic

Select Fringe Result

1. 1_Displacement,Translational

Result Quantity : Magnitude

Select Deformation Result

2.1_Displacement, Translational

Apply

No-show all message on the upper portion of viewport

Display | Result... Erase Show Result Title.

Display only the deformed shape except the original model.

Display | Results.... Show Undeformed Entities ===> set off

125

l

Display the contour of von Mises stresses.

Select Fringe Result

1. 1_Stress Tensor

Result Quantity : Von Mises

Select Deformation Result

1. 1_Displacement, Translationa

Apply

Display various analysis results.

(For example, displacements, Ux, Uy, and Uz, stresses, Sx, Sy, and Sz,......)

126

r,

t-

T-

< The steps of the Analysis Procedure >

♦ The first Step : Modeling(Geometric Shapes, Material and Physical Property, Boundary and Load Conditions)

METHOD create a model with a drawings in Patran.import a CAD Model created already. (IGES, CATIA, Pro/EngineeCADDS5, EUCLID-3, Unigraphics)

♦ 2nd Step : SolutionGenerate the input data for MSC/NASTRAN and perform NASTRAN for ouput file.

♦ 3rd Step : Post-processing (Verifying the results)Check the results printed as text file or verify graphically by using MSC/PARAN.

The First Step : ModelingStart Patran.% > p7

METHOD click Preferences | Analysis...in main menu. Analysis Preference

Decide Analysis Code and Type

filename.bdf for input data

filemane.op2 for output data

59

click File | New... New Model Preference

File | New ... New DataBase NameOkNew Model PreferencesUse default value. | Ok

Import IGES File.File | Import Object : Model

Source : IGES

confirm the directory that the file to be imported exists.

Double click */.. to go back to the preceding directory.

Click the file name on the list on the right side.

- Apply -

In case of Based on Model, if the sizemodel is maximum, the tolerance is0.05% of its size.

Default value of the tolerance is 0.005.

case 1

60

3226

Displaying a table summarizing the imported IGES file.

OKWarningTrimming Loop is not closed for Trimmed Surface defined on Parameter Data Line numberin the IGES file. The Trimmed surface was not processed.Reset and select OK button.

A solid model built up bysurfaces.Meshing shell elements onoutside surface of the solidmodel.

(Iso 3) View

61

t).

Meshing the model.First, mesh the outside surface on the right of the quadrilateral shape of parts in the model

Group | Create New Group NameClick Select Box and when the cursor is blinking,Edit a group name.Make CurrentWhen this switch is on, the Group is current andall elements to be created belong to this group (righ

- Apply -Cancel

To maintain the view when translating, rotating, and zooming the model, work the following.

Preference | Graphics.. Switch off all toggles shown on the right . Apply(By one click, toggle on or off.)

Cancel

• GeometryCurves to make surfaces are obtained from imported surfaces.Create | Curve |ExtractOption : Edge(generate curve on a surface boundary Edge)

Change to ( Top ) View.

Auto ExecuteEdge List : By dragging mouseselect this area.(For this, Preference|Picking..

Enclose Centroid is useful.)

-Apply-

right

62

t

63

Post only curve entities made.Group | Post ... Select Group to Post

rightApply

Cancel

( Iso 3 )View

Add curve to unconnected section.Create | Curve | Point Option : 2 Point

Auto ExecuteEven though no points are included in the currenGroup and displayed, curve can be created.Starting Point List(select upper point)

Curve 11.1(means the position of vertex 1 of curve 11)

Ending Point List(select lower point)

Curve 1.1(means the position of vertex 1 of curve 1)

Create edge curves on the inside surface of three pipe in total model.

Group | Post... Select AllApplyCancel

er

64

Create | Curve | Extract Option : EdgeAuto ExecuteEdge List : select curve in the order of the numbappeared on the above picture.(Highlighted in orange color)

Surface23.1 24.1 25.1 26.1 27.1 28.1Apply

Group | Post... Select Groups to PostrightApplyCancel

Tool | List | Create...

Geometry | Point | Association AssociationCurveCurve Curve 1:27(select all curves in the right group)

Target List “A”Apply

1

2

3

4

5

6

rcles.

List A

When clicking,List Save Menu is displayed.

List SaveGroup Nameright (Current group is listed up.)(Select a group to save the contents of list A.)

ApplyTo finish, click cancel in target list.

(Point Size ) Scale up points on screen.

Default size of the point is 9. Reduce this size to 5, which is appropriate for looking.

Display | Geometry Point Size 5ApplyCancel

Move three small circles on the picture to the surface made by straight lines.Measure the distance between small and large circles. Points have nothing to do with ci

Show | Point | Distance Option : PointAuto ExecuteFirst Point List(Refer to label on the next page.)

Point 51 (Select a point on the small circle.)

Second Point List Point 27 (Select a point on the large circle)

CancelTransform | Curve | Translate Translation Vector

< -5 0 0 >

65

Delete Original CurvesAuto ExecuteCurve List Curve 22:27ApplyDo you wish to delete the original curves?

( Show Label ) on

Display | Entity/Label....Change Show Label Size to8 and apply, then the labelSize is reduced like the sizeon the picture on the left.

Before transform

After transfom

66

are notture.

If meshing is done on trimmed surfaces made using curves shown on the above, mesheswell-shaped. To make well-shaped mesh, divide curves and create surfaces as following pic

If the surface is created like the above, a well-shaped mesh can be obtained.Break the circle in halves.Edit | Curve | Break Option : Parametric

Parametric Value : 0.5Auto ExecuteSelect all circle curves on the curve list of ‘right’Group.

By using ‘Polygon Pick’ of‘SelectMenu’, Curve 5:10 28:33select curves with ease. Apply

67

Do you wish to delete the original curves?Yes

Circles brokenEdit | Curve | Break Option : Point

Auto ExecuteCurve List Curve 3 (Upper curve)

Break Point List Point 116 120 118ApplyDo you wish to delete the original curves?Yes

Curve List Curve 4(Lower curve on the right)

Break Point List Point 115 119ApplyDo you wish to delete theoriginal curves?Yes

68

2

Curve List Curve 1(Lower curve on the left)

Break Point List Point 117ApplyDo you wish to delete theoriginal curves?Yes

Create curves for surface.Create | Curve | Point Option : 2 Point

Auto ExecuteStarting Point List Point 129Ending Point List Point 116Create curves with referring to labels, hereafter.Point 115 131/ 128 120/ 119 130/ 127 118/ 117 13

69

Merge unconnected curves before creating surfaces.Edit | Curve | Merge Curve List Select with holding Shift Key.

Curve 36 35ApplyDo you wish to delete the original curves?Yes* Merge coupled curves by two.

No show labels of points.

( Label Control )

(Click point only. Then, labels of un-

highlighted elements are disappeared.)

/37 34 / 44 43 / 45 42 / 40 39 / 41 38 / 62 66Edit | Curve | Break Option : Point

Auto Execute

Curve List Curve 65Break Point Point 108 105ApplyDo you wish to delete theoriginal curves?Yes

70

curves

in the

Click (Right Side View) to change the view.

Viewing | Angles... Model Relative

Angles

-90, 0.0, 0.0

Apply

(Auto Scale View ).

Give a name to the current view and store it to reuse.

Viewing | Named View Options... Create View...

v1

Apply

Close

Creating a trimmed Surface.

To make a surface which is composed of over 4 edges, create a outline curve by connecting

with chain and use Create | Surface | Trimmed.

Method to create a outline curve.

.By using Auto Chain.. in Create | Curve | Chain, select curves to be connected one by one

curve list..

.Auto Chain... in Create | Surface | Trimmed is also available.

Create | Surface | Trimmed Option : Planar

Auto Chain...

Auto Execute

Select Start a Curve

Curve 2

Blue points are generated on

the curve selected next

Choose Curve to Continue

Curve 64

If curves for a surface are

listed, then OK, or click Next

to list up curves to be

connected at the end point of

71

e

ing

Curve 2.

Next Curve List

Curve 68 74 68 57

The following question is issued when the end point of th

last selected curve is reached to the end point of a start

curve.

Do you wish to delete the original curves?

No

* The next chain curve to be

created

Select Start a Curve

Curve 67

Curve to Continue

Curve 74 68 63 70 75 69 60

Do you wish to delete the orig-

inal curves?

No

Select Start a CurveCurve 69Curve to ContinueCurve 76 70 79 72 77 71 59Do you wish to delete theoriginal curves?No

72

Select Start a CurveCurve 71Curve to ContinueCurve 78 72 82 20 19 12 1516 80 21 11 58Do you wish to delete theoriginal curves?NoCancel

Outer Loop List (select thecurve generated previouslyby the chain.) Curve 83- Apply -Do you wish delete the origi-nal curves? No

(Display Line) on

Outer Loop ListCurve 84- Apply -Do you wish delete theoriginal curves? No

73

ent inents,es on

r

Outer Loop List Curve 85-Apply-Do you wish delete the originalcurves? No

Outer Loop List Curve 86-Apply-Do you wish delete the originalcurves? NoCancel

(Display Line) offThe arrow indicates the point located in the boundary between the rectangular componworking and a large circle on the bottom. To coincide the element edges of both componassociate the point with the surface (by this step, the surface is meshed with creating nodassociated points).Group | Post.. Select All

Apply

(Hide labels)

Associate | Point | SurfaceAuto ExecutePoint List Select Point 4Surface ListIndicating (created previously) Select Surface 58The location of triangle points is the

boundary that the upper and lowe

components are connected.

(if associated, then symbol is a triangular)

Group | Post ... Select Groups to Postright

74

ApplyCancel

Finite ElementDefine the number of elements around a circle is four in Mesh Seed.Create | Mesh Seed | Uniform Number 4

Auto ExecuteCurve ListCurve 73:78Apply

Create | Mesh | Surface Global Edge Length 6

PaverSurface List : select all sur-face in right group. Surface 55:58Apply

Viewing | Named ViewOp-tionsClick V1 stored previously to change a

view.

The meshed surfaces.

75

d

mallar too.

For the rest of the space, do 2 Curve Mesh using two curves faced each other.

Merge the curve of the small circle first.

GeometryEdit | Curve | Merge Curve List : after clicking every two the paire

curves,/ 47 48 / 51 52 / 50 53 / 55 56 / 54 57 /

Apply

After having merged, mesh the circumference of the circle with two curves (for large and scircle) of circles facing each other and then mesh the left empty region shaped of rectangul

Create | Mesh | 2 Curves Global Edge Length 6Auto ExecuteCurve 1 List :Curve 2 List :Unpost elements for a convenient view.

(Plot /Erase)Click Erase All FEM.Ok

76

Meshing a circle part./ 73 87 / 74 88 / 75 89 / 76 90/77 91 / 78 92 /Meshing the rectangular,empty region on the left./ 20 18 / 18 17 / 17 16 /Meshing by selecting everytwo the paired curves.

2 Curve Mesh

Coincide duplicated nodes by plot all elements.

(Plot /Erase)Plot All EntitiesOk

Coincide duplicated nodes.Equivalence | All | Tolerance Cube Apply

77

t

Mesh is finished on this side, then mesh the opposite side. Create a new group.Group | Create ... New Group Name : left

Make CurrentApplyCancel

Finite ElementsUse Copy function to create elements on the opposite surface.Transform | Element | Translate Translation Vector

(Tip ans base points) Click

Click Point 1 first, and then click

Point2.

Auto ExecuteElement ListSelect all elements meshed on the righ

group.

Elm 1:156Apply

1

2

78

transformed elements.

Copied elements will be included in the left group.Creating elements on the left surface.Sweep | Element | Extrude Mesh Control

Number 3OkDirection Vector

( Tip and base Points ) Click

View is current.

In Select Menu, change to Node and

select.

And then change again to Point and

select.

Base Entity List

(Elements Edge )After picking the polygon, select the

element edge.

Apply

79

t

those

.shell elements created aelement edge by the sweepcommand.

After having meshed on surfaces faced each other, mesh the region to be connected bysurfaces.Sweep | Element | Extrude MeshControl

Number 6Direction Vector

(Tip and Base Points )

Click Point 1 first, and then Point 2.

Base Entity List

(Elements Edge )select the element edge with Polygon

Pick.

Apply

12

80

Display | Plot /Erase ... Erase All GeometryOk

(Hidden Plot )

(Wireframe)

Display | Plot /Erase... Plot All EntitiesOk

(Plot / Erase) Erase All FEM

81

t

Create surfaces on the rest of spaces and mesh.GeometryTransform | Curve | Translate Translation Vector

(Tip and Base Points)

Click Point 1 first, and then Point 2.

Auto ExecuteCurve List :Click the surface edge (Orange) on the

back.

Surface 7.1 10.3 6.1 Apply

.Curves created on the fronby ‘copy’

Edit | Curve | Merge CurveListSelect three curves created newly. Curve 93:95 (refer to the next picture)ApplyDo you wish to delete the original curves?Yes

1

2

82

group

Create | Surface | Curve Option : 2 Curve

Auto ExecuteStarting Curve List Surface 29.4Click upper surface edge andlower curve merged.Ending Curve LIst Curve 96

Create points on boundary nodes in order to mesh with respect to the element edge of leftwhich was already meshed, and associate them with surfaces.

(Plot / Erase) Plot All EntitiesCreate | Point | XYZ Auto Execute

Point Coordinate ListChange Select Menu to Node and select. Node 364:367 470 491Apply

83

on the

Associate points with thesurface.Associate | Point | SurfaceAuto ExecutePoint List Point 133:138Select points created previously

with dragging mouse.

Surface ListSurface 60Apply

.Associated points

Fit together the number of element edge to the upper surface by setting the mesh seed as 6upper edge of surface 60.Finite ElementCreate | Mesh Seed | Uniform Number 6

Curve ListSurface 60.4Apply

Create | Mesh | Surface Global Edge Length 6Mesher.Paver

84

Auto ExecuteSurface ListSelect the surface created previously.Surface 60

.Hidden plot of right, left, and

default groups whose meshing iscompleted.(If the geometry and elements are

plotted together, the hidden plot is

not clear)

Display | Plot /Erase Erase All GeometryOK

(Refresh Graphics)

.a distinct picture of hiddenplot

Display | Plot /Erase Plot All EntitiesOk

(Wireframe )

85

e

Creating a pipe passing through a circle.Group | Create New Group Name pipe

Make CurrentApply

Group | Post Select Group to Postdefault_group, right, pipeApplyCancel

Sweep | Element | Extrude Mesh Control

Number : 6OkDirection Vector

(Tip and Base Points)Define a vector with two points

Base Entity

(Element Edge)Select element edges around the circl

(Orange).

Apply

.elements making up Pipe.

12

86

Group | Post Select AllApplyCancel

Equivalence | All | Tolerance Cube Apply

Display | Plot/Erase... Erase All FEMOk

(Front View)

Group | Create ... New Group Name

Entity Selection Select by dragging a mouse.

Apply

support1

87

s

re

Group | Post ... Select Group to Postsupport 1ApplyCancel

GeometryCreate | Surface | Trimmed Option : Planar

Auto Chain...

Create new curves by connecting curve

forming the lower surface and generate

a new surface.

This surface is created byextruding the element bound-ary edges which are madefrom the surface.

Auto ExecuteSelect a Start Curve

Choose Curve to Continue

Then, OK. If the bellow surface edges and curves ashown, then OK, or do next to get them.Surface 49.1 48.4 47.2 Curve 16

Do you wish to delete the original curves?NoCancelOuter Loop ListSelect curves created before by chain.

ApplyDo you wish to delete the original curves?No

Surface 51.1

Surface 50.7

Curve 97

88

-

t

Lets check the weight of the structure before meshing the support1 group.

When assuming that there is a coordi

nate frame inside the circle on the pic-

ture, the load, 450Kgf, is applied to the

portion, where the arrows are indicating

on the picture, to the x-direction (by 15

degrees on both sides, total is 30

degrees). Therefore, nodes for elemen

are created on those points better.

Group | Post ... Select Group to Postdefault_group, support1ApplyCancel

Create a temporary coordinate frame in order to generate a node on the loading positions.Create three points necessary to define a coordinate frame.

Create | Point | ArcCenter .Auto Execute

Curve ListCreate the center point of the circle.

Select the surface sdge.

a created point 139.

Surface 3.1

89

Create a new point necessary to define the z axis.Create | Point | Extract Parametric Position : 0.5

Auto ExecuteCurve ListClick the surface edge selected just before.

Then, two points are created.Create | Coord | 3 Point Type : Rectangular

Auto ExecuteOrigin : click the center point (139) of the circle.

Point on Axis 3 :click the extracted point (140).

Point on Plane 1-3 :click point 5 on the right side from the center

of the circle

Point 104

Transform | Point | Rotate Axis

(Coordinate System Direction 2) Click

click a new coordinate.

Rotation Angle : -30Auto ExecutePoint List

Surface 3.1

139

5

140

Coord 1.2

Point 104

90

ves are

l

A copied point

Associate copied points with the surfaceGeometryAssociate | Point | Surface Auto Execute

Point 141Surface List

Apply(Associate : When meshing a surface, create nodes on the positions where points and cur

associated, and mesh.

Surface 61

Associated point

(A triangle mark means a successfu

association.)

Point List

Surface 61

91

shing is
If meshing is started on the surface, then nodes are created on the associated points and medone.Group | Post ... Select Group to Post
support 1ApplyCancel

Finite Mesh Global Edge LengthPaverSurface List

Apply

Click surface 61.

This surface copies theelements of the surface 61meshed already.

Transform | Element | Translate Translation Vector

ClickClicking point 1, and then click point2 .

Element ListSelect via dragging mouse.

Apply

6

Surface 61

1

2Elm 683:712

92

Elements on the side surfacevia transforming.

Sweep | Element | Extrude Mesh Control...

NumberOkDirection Vector

(Click)Click point 1 first, and then click point 2.Base Entity List

(Elements Edge) Click

Select fifteen element edges.

Apply

4

2

1

93

The completed extrusion

Group | Post... Select Group to Postright, support1ApplyCancel


94

bel

Creating a element directly.Create | Element | Edit

Shape : QuadTopology : Quad4Pattern : StandardAuto ExecuteNode =1 : Node 875Node =2 : Node 130Node =3 : Node 128Node =4 : Node 964

Create four elements with selecting nodes by referring to the node la

on the picture.

(964 128 129 948) (948 129 127 932)(932 127 123 828)

Next, mesh the support on the opposite side.

Group | Post ... Select Group to Postdefault_groupApplyCancel

Do grouping the geometry data on the opposite side named as support2.


(Front View)

support2

95

ociated

Entity SelectionSelect via dragging mouse.ApplyCancel

Group | Post... Select group to PostSelect left, support2 with holdingCtrl Key.

ApplyCancel

To coincide with elements meshed already and the edge, change nodes into points and assthem with the surface.GeometryCreate | Point | XYZ Auto Execute

Point Coordinate List

Click to change a view.

Create points on the nodes.Apply

Surface 35

Node 372:370:-1 368 471 492

96

.
Associate | Point | Surface Auto Execute
Point List Click point created in the previous step

Surface List

Apply

Finite Element

Create | Mesh | Surface Global Edge Length

PaverSurface List

Apply

Post the support2 group only and mesh.Group | Post ... Select Group to Post

Support2ApplyCancel

Complete the other side of surface via copying the elements of surface 35 meshed already.

Transform | Element | Translate Translation Vector

Click

Point 142:147

Surface 35

8

Surface 35

97

The copied elements.

Element List Select elements via the surface mesh.

Apply

Create | Mesh Seed | Uniform Number

Curve List

Apply

Create | Mesh | Surface Global Edge Length

IsoMesh

1

2

Define vector with point

Elm 807:826

4

Surface 38.3

8

98

Surface List

Apply

The surface mesh

Group | Post ... Select Group to Postsupport2, leftApplyCancel

Equivalance | All | Tolerance Cube Apply

Create a element by selecting node directly on the upper part of the support.

Create | Element | Edit Shape : QuadTopology : Quad4Pattern : StandardAuto Execute

Node 1 : 376Node 2 : 1005Node 3 : 1060Node 4 : 374...Node.

Select the parenthesized node.

(374 1060 1052 375)(375 1052 1044 373)(373 1044 973 369)

Surface 37

Surface 38

Surface 38 37

99

Do Hidden-Line-plot the meshed model.Group | Post Select Groups To Post

Select AllApplyCancel

Display | Plot /Erase... Erase All GeometryOkCancel

(Iso 3 View)

(Hidden Line)

The hidden line plot of theelements except geometrydata.

Display | Plot/Erase... Plot All EntitiesOkCancel

(Wireframe)

Next, mesh the lower, large circle. (use Sweep | Extrude)


Make CurrentApplyCancel

circle

100

Sweep | Element | Extrude Mesh Control...

Number

OkDirection Vector

( Click )Define a vector with two points

Click point 1 first, and thenclick point 2.

Base Entity List

(Element edges included in support1

group)

(Select four element edges in‘support2’ group.)

Apply

1

Select ten element boundary edges

(Orange).

101

n

Elements extruded to negativeY direction.


Number

Direction Vector

(Click)

Click the point. Click the point

Base Entity List

(Element Edge)Select nine element edges othis surface edge.

Apply

1

102

in the

Extruded elements

The circle group is created by extruding elements with checking with element edges meshedright group.Group | Post ... Select Groups to Post

circle, rightApplyCancel(Post two groups only. The current group is the circle.)


Number

Direction Vector

(Click)Define a vector with two points.

Click point 1 first, and then click point

2.

3.2 is listed..

Base Entity List

(Elements Edge)Select all element edges

around the circle (orange).Apply

1

1

2

Extrude Distance

103

d

Extruded elements


Number

Direction Vector

(Click)

Extrude Distance

Offset

Input the magnitude of the extrusion

used previously.

Base Entity ListUse the same element edge list selecte

before.

Apply


Number

2 (the number of elements for the next is two.)

13.6

3.2

1 (the number of elements for the next is one.)

104

d

d

Direction Vector

(Click)


2.

Extrude DistanceOffset

Add the magnitude of the extrusion used

before and input that number.


before.

Apply


NumberDirection Vector

(Click)


2.

Extrude DistanceOffset




before.

Apply

1

2

3.2

16.8

4 (the number of elements for the next is four.)

1

2

22

20

105

d

Sweep | Element | Extrude Mesh ControlNumber4(the number of elements for the next is four.)

Direction Vector

(Click)


2.

Extrude Distance

Offset




before.

Apply

Complete the circle group using the geometry of the default group (use Sweep | Arc).Group | Post ... Select Groups To Post

circle, default_groupApplyCancel

Sweep | Element | Arc Mesh Control...

Number

Axis

(Coordinate System direction 2)

Sweep Angle

Base Entity List

(Element Edge)Apply

5.2

42

4

Coord 1.2(Click the coordinate created before)

30.0(value that a loading location is considered)

106

,
(The color of elements may be changed
but no problem.)

Select element edges withPolygon Pick.

Swept Elements

Complete the circle model with the element edges again.Sweep | Element | Arc Mesh Control...

Number 16Axis

(Coordinate System Direction 2)

107

Sweep Angle

Base Entity List

(Elements Edge)Select the marked region in the previous page with Polygon Pick.

Apply

Swept Elements


Meshing of the model is completed. Check the element boundaries via posting all group.

Coord 1.2

150.0

108

Group | Post.. Select AllApplyCancel

Verify | Element | Boundaries Free EdgesApply

Reset GraphicsDisplay | Plot/Erase Erase All Geometry

OK

(Hidden Plot )

the completed full model

( Wireframe )

109

Renumber | Node Start ID or List of New IDs1Node ListSelect the total model.Apply

Total nodes : 1339Total elements : 1316Create table of a material properties used for components.

Materials

Create | Isotropic | Manual Input Material Name

Input Properties...

Elastic Modulus

Poisson Ratio

Apply | Cancel

Input the thickness of each component.Properties

Create | 2D | Shell Property Set Namethick

Input Properties...

Material

Click steel on the material property sets.

Thickness

OkSelect MembersClick the box, and then

(2D element)ClickSelect all elements.

AddListed up on the application region.Apply

Create the boundary conditions.Load / BCsGroup | Post Select Group to Post

rightApply | Cancel

Create | Displacement | Nodal New Set Name

Input Data...Translations < T1 T2 T3 >

Steel

20700

0.3

3.2

m : steel

3.2

Elm 1:1316

all_fix

<0 0 0>

110

the

Rotations <R1 R2 R3>

Ok

Select the application region ... FEMSelect NodesPlot right and left groups, and then select nodes in around circle on

surface to the positive X axis.

AddOkApply

Group | Post ... Select Group to PostleftApplyCancel

Create | Displacement | Nodal New Set Name

Input Data...Translations < T1 T2 T3 >

Rotations < R1 R2 R3 >

Ok

<0 0 0>

Node 158:181

tz_fix

< , , 0>

< >

111

112

Geometry Filter FEMSelect NodesSelect nodes on around circle.

AddApply

Node 351:374

Documents

Case 1 Strength Analysis of Engine Mounting Bracketweb.mscsoftware.com/support/online_ex/Scenario/Case/case1_1a.pdf · Jobname : case1 Solution Type ===> Click Solution Type : Linear