Joint - Presentation

7/31/2019 Joint - Presentation

http://slidepdf.com/reader/full/joint-presentation 1/46



S.N. Sathiya Narayana

Under the Guidence of

Mr. Suresh Kumar Associate Professor

(Head of the Department – Mech)



To investigate the stress distribution of various

configuration of single lap joint by experimental

analysis .

A parametric study of hybrid joint by varying the three

dimensional parameters of the joint will be carried out

using FEA software.



BONDED

JOINT

RIVETED

JOINT

HYBRID

JOINT



The various Joints were Prepared for analysis and

Experimental work

Such Joints are…

Bonded Joint

Riveted Joint Without Adhesive

Hybrid Joint



Bonded joints can be made by gluing together pre-cured

laminates with the suitable adhesives or by forming jointsduring the manufacturing process, in which case the jointand the laminate are cured at the same time (co-cured).

In general, there are numerous advantages of adhesivebonded joints over the traditional mechanical fastened

joints

These advantages include large bond area for loadtransfer, low stress concentration, smooth externalsurfaces at the joint, less sensitivity to cyclic loading,

time and cost saving, high strength to weight ratio,electrical and thermal insulation, conductivity, corrosionand fatigue resistance, crack retardation, dampingcharacteristic and so on.



Disassembly is impossible withoutcomponent damage.

They can be severely weakened byenvironmental effects.

They require surface preparation.

Joint integrity is difficult to confirm byinspection. Thus ensuring a quality of

bonding has been a challenging task.



The behavior of riveted joints is also influenced byrivet parameters such as rivet size, clamping force,hole size and tolerance. Of these parameters, theclamping force, that is, the force exerted in thethrough – thickness direction by the closing of thefastener, is of critical importance

Advantages of riveted joints are thatNo surface preparation of composite is required.

There are no abnormal inspection problems.



Hybrid joints have a combination of adhesivebonding and mechanical fasteners

The advantages of using a combinedbonded-riveted design apply mainly in arepair situation. It is generally accepted that abonded joint is stronger than a mechanicallyfastened joint and a well-designed bonded

joint is stronger than a hybrid joint.



Manual method is adopted. Billet size 300 mm x 300 mm

Thickness of 3.5 mm. (3 layers)

Epoxy–

hardener ratio -> 10:1 Curing time-12 Hrs at Room temperature.

Load applied-10 kg.





















COMPONENT MATERIAL

Laminates Glass/Epoxy

Composite

Adhesive HY554

Rivet Aluminum

Glass Fibre /Epoxy Composite

The analysis for bonded joints was performed by applying a tensile load

of 5000 N at the end of the joint which was free to move in the

longitudinal direction only (UY = UZ = 0). The opposite end of the joint

had fixed boundary condition (UX = UY = UZ = 0).









T t R lt A i t G h S l



Sl.No

Test Description

RivetedJoint Bonded

Joint HybridJoint

1

Ultimate/ BreakingLoad

2 Maximum Stress

Test Results – Approximate Graph Sampl



0

500

1000

1500

2000

2500

1 2 3 4 5 6 7 8 9 10 11

LOAD-N

L o a d -

N

Displacement-mm



0

1000

2000

3000

4000

5000

6000

1 2 3 4 5 6 7 8

LOAD-N

Displacement-mm

L o a d

- N



0

1000

2000

3000

4000

5000

6000

1 2 3 4 5 6 7 8 9 10 11

LOAD N

L o a d

- N

Displacement-mm



FINITE ELEMENT

ANALYSIS











PROCEDURE

MODELING

(CATIA)

CREATINGPARTS

MAKINGASSEMBLY

ANALYZING

(ANSYS)

APPLYINGELEMENT

VALUES

APPLYING

BOUNDERY

CONDITIONS

APPLYING

LOADS

SOLVER

SOLVING THE

MODEL

POST-PROCESSOR

RESULTS











The study can be extended to the failureprediction of the various configurations of joints

using various failure modes and also the progressive

failure analysis (dynamic analysis) can be carried out.

The analysis of hybrid joints can be done using

other criteria so that more progress can be made in

the hybrid joining technology leading to the use of hybrid joints as a primary repair technique.

SCOPE OF THE PROJECT



Thus from the Experimental and Analysis, it

was found that a well-designed hybrid joint is

very efficient when compared to bonded or

riveted joints in the case of repair situation in

aircraft structures.













Documents

Joint - Presentation