고체역학 (Beer) — Stress and Strain—Axial Loading: Problem 2.91

2.91 A composite cube with 40-mm sides and the properties shown is made with glass polymer fibers aligned in the x direction. The cube is constrained against deformations in the y and z directions and is subjected to a tensile load of 65 kN in the x direction. Determine (a) the change in the length of the cube in the x direction and (b) the stresses \(\sigma_x\), \(\sigma_y\), and \(\sigma_z\).