고체역학 (Gere) — Analysis of Stress and Strain: Problem 7.2-14

7.2-14 Repeat the previous problem [7.2-13] using \(\theta = 30^\circ\) and stresses on the rotated element: \(\sigma_{x1} = 70\) MPa, \(\sigma_{y1} = -82\) MPa, and \(\tau_{x1y1} = -35\) MPa. (Context from Problem 7.2-13: Two steel rods are welded together; the seam is oriented at angle \(\theta\). Find the state of plane stress on the element if it is rotated clockwise to align the \(x_1\) axis with the longitudinal axis of the rods.)