(Solved):   Problem 3: 2D plane stress (20 points) A triangular plane stress element is given in Figur ...

 

Problem 3: 2D plane stress (20 points) A triangular plane stress element is given in Figure 2 in which the coordinates are in inches. Let E-20e6 psi, poisson's ratio v=0.15, and thickness t =1 in. If the nodal displacements are u? = 0.002 in, v? = 0, u? = 0, v? = 0.0024 in, u3 = 0, V3=0.0024 in. (1) Calculate the stiffness matrix K; (10 marks) (2) Calculate the stresses, Ox, Oy, Txy. (10 marks) 4 y 3 (1, 1) 2 (1,0) Figure 2 (2,0)