고체역학 (Gere) — Axially Loaded Members: Problem 2.6-17

2.6-17 Acting on the sides of a stress element cut from a bar in uniaxial stress are tensile stresses of 60 MPa and 20 MPa, as shown in the figure. (a) Determine the angle \(\theta\) and the shear stress \(\tau_\theta\), and show all stresses on a sketch of the element. (b) Determine the maximum normal stress \(\sigma_{\max}\) and the maximum shear stress \(\tau_{\max}\) in the material.