Discussion
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.
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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