How does the internal shear stress distribution vary across the cross-section of a twisted shaft____________________?
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Answer: B. from zero at the center to maximum at the circumference
Explanation
Torsion applied to a circular shaft creates internal shear stresses that vary linearly across the radius. At the exact center axis, the rotational radius is zero, meaning the induced shear stress is also zero. Moving outward increases the radius to a maximum at the outer surface where shear stress peaks. Torsional shear stress is zero at the neutral axis and reaches its maximum value at the outer fiber. Solid circular shafts are less efficient in torsion than hollow shafts because core material carries little stress. Polar moment of inertia governs the angular twist and shear stress distribution in twisted members.
Option A incorrectly suggests maximum shear stress occurs at the center and zero at the outer circumference. Option C contains typographical errors and reverses the actual linear stress distribution pattern. Option D misstates the radial progression of shear stress from the central axis to the outer surface.
- Subject
- Engineering
- Category
- Mechanical Engineering
- Topic
- —
- Difficulty
- medium
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