고체역학 (Beer) — Transformations of Stress and Strain: Problem 7.149

7.149 The strains determined by the use of the rosette attached as shown during the test of a machine element are \(\epsilon_1 = -93.1 \times 10^{-6}\) in./in., \(\epsilon_2 = +385 \times 10^{-6}\) in./in., \(\epsilon_3 = +210 \times 10^{-6}\) in./in. Determine (a) the orientation and magnitude of the principal strains in the plane of the rosette, (b) the maximum in-plane shearing strain.