Discussion
Consider the following statements about warping:
1. It is an axial displacement that leaves the section non-planar.
2. Restraining it produces additional direct stresses.
3. A circular shaft warps more than any other section.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 are correct: warping is an axial displacement that leaves the section non-planar, and restraining it generates additional direct stresses. Statement 3 is the exact reverse - the circular shaft is the one common section that does not warp at all, which is precisely what makes the elementary torsion theory exact for it.
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