고체역학 (Beer) — Transformations of Stress and Strain: Problem 7.143

7.140 through 7.143 For the given state of plane strain, use Mohr’s circle to determine (a) the orientation and magnitude of the principal strains, (b) the maximum in-plane shearing strain, (c) the maximum shearing strain. 7.143: $\epsilon_x = -180 \mu, \epsilon_y = -260 \mu, \gamma_{xy} = +315 \mu$