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Assertion (A): Shear flow rather than shear stress is the natural variable in thin-walled analysis.

Reason (R): Shear flow stays constant along a wall whose thickness varies.

Select the correct answer from the options below.

  • A.Both A and R are true, but R is not the correct explanation of A
  • B.A is true but R is false
  • C.A is false but R is true
  • D.Both A and R are true, and R is the correct explanation of A

Answer: D

Correct answer: Both A and R are true, and R is the correct explanation of A

Both are true and the reason gives the mechanism. Because \( q \) is continuous along a wall whose thickness steps or tapers, the equilibrium equations can be written in terms of a single unknown per panel, whereas the stress changes at every thickness change. The stress is then recovered at the end by dividing by the local thickness.

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