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Computer-Aided Mechanical Design Assignment -
Question: Figure 1 shows a 2D mesh for a structural plan stress analysis problem. We assume that an element with No 15 is such a quadrilateral element with 4 corner nodes in the mesh, and its 4 node coordinates in the global coordinate system (in millimetres) are given in Figure 2. Let Young's modulus E = 200GPa and Poisson's ratio ν = 0.3.
As indicated in Figure 3, using the isoparametric Q4 element and 4-node Gaussian quadrature (numerical integration to approximate the element stiffness matrix), calculate:
1. The stiffness matrix of the element 15 by using hand calculations.
2. The stress of the element at the local location (ξ = 0, η = 0) of the element, if we know the displacements for the element No 15 are {d} = {10, 5; 20, 1; 15, 5; 10, 1}.
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