1. Evaluate the stiffness matrix for the elements shown in Figure P6–6. The coordinates are given in


1. Evaluate the stiffness matrix for the parts shown in Figure P6–6. The coordinates are fond in units of millimeters. Assume plane stress provisions. Let E = 210 GPa, n = 0:25, and t = 10 mm.

2. For the parts fond in Problem 6.6, the nodal displacements are fond as

u1 = 2:0 mm v1 = 1:0 mm u2 = 0:5 mm

v2 = 0:0 mm u3 = 3:0 mm v3 = 1:0 mm

Determine the part stresses sx; sy; txy; s1, and s2 and the leading propensity yp. Use the values of E; n, and t fond in Problem 6.6.