Evaluate the stiffness matrix for the elements shown in Figure P6-3. The coordinates are in units of

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Evaluate the stiffness matrix for the elements shown in Figure P6-3. The coordinates are in units of inches. Assume plane stress conditions. Let E = 10 × 106 psi, v = 0.25, and thickness t = 1in.

(a)

4У (0, 1) х (2, 0) (0, - 1) 3.

(b)

(1.2, 1) 3 (2.4, 0) х (1.2, 0) 2

(c)

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