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When a closely coiled helical spring is subjected to a couple about its axis, the stress induced in the wire material of the spring is. | |
A. | bending stress only [Correct Answer] |
B. | a combination of torsional shear stress and bending [Wrong Answer] |
C. | direct shear stress only [Wrong Answer] |
D. | a combination of bending stress and direct shear stress [Wrong Answer] |