題組內容
1. An element in plane stress is subjected to the stresses \( \sigma_x=90 \) psi, \( \sigma_y=40 \) psi, and \( \tau_{xy}=20 \) psi, as shown in Fig-1.
(b) Determine the principal stresses. (6%)
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1. An element in plane stress is subjected to the stresses \( \sigma_x=90 \) psi, \( \sigma_y=40 \) psi, and \( \tau_{xy}=20 \) psi, as shown in Fig-1.
(b) Determine the principal stresses. (6%)