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BDA 40303
FINITE ELEMENT METHOD
WEEK 6
LABORATORY SESSIONS
By
Dr. Izzuddin Zaman
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EXERCISE 1: COMPOSITE PLATE
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A material sample of thin structure (1.2mm thickness) consist of three layers. All layers are made of the same matrix with different fiber orientation. The fiber of the first layer is oriented 90 angle with the matrix longitudinal (x) direction, whereas the second and the third layers are oriented at 60 and 0, respectively.
EXERCISE 1: COMPOSITE PLATE (CONT.)
The modulus elasticity of FIBER in longitudinal direction (axial direction) is EL = 2x105 N/mm2 and in transverse direction is ET = 1x105 N/mm2.
The shear modulus of the fiber is G = 2.5x105 N/mm2 and has a Poisson’s ratio of, v = 0.1.
The modulus elastic of MATRIX in longitudinal direction EL = 5x104 N/mm2 , ET = 5x104 N/mm2,G = 7x104 N/mm2 and v = 0.3.
The shear flexibility of the composite G44 = 23 N/mm2 and G55 = 23 N/mm2.
The volume ratio of fiber to the structure (fiber and matrix) is 0.5.
The dimension of the specimen is 50mm × 20mm (See next figure
Edge AD is complete fixed and at edge BC, longitudinal loads (x direction) are applied 1000N.
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EXERCISE 1: COMPOSITE PLATE (CONT.)
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EXERCISE 1: TIPS FOR SOLUTION
Model>Type of Analysis>3D>Static>General
To define composite material with fiber reinforce, the material
should be Laminate 9
Model>Materials>Geometric tab, select Plate/shell/membrane,
and enter the thickness of the structure 1.2
Create nodes and Quad4 element using corner nodes: (0,0);
(8,0); (8,1); (0,1).
Elements > Refine Customs. Number of subdivision, R=?,
S=?, Tolerance=1e-4
One of line edge restrained (displx=0, disply=0, displz=0,
rotx=0, roty=0, rotz=0).
Loads > Add/Edit > Forcex = 1000
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EXERCISE 1: TIPS FOR SOLUTION
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EXERCISE 2: BENDING LOADING
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Using similar composite system in previous exercise 1.
Along edge BC is applied with the load of 10N at z direction and
fixed edge at AD
TASK 3: COMPOSITE PLATES
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Students are requested to do investigation to find the best fiber
orientation configuration of the composite structure with reinforced
fiber by employing LISA.
The specimen to investigate is similar with that of previous
exercises.
1. Find the best configuration for longitudinal loading
2. Find the best configuration for bending loading
The configuration of the fiber orientation is listed in Table below
