Discussion
Assertion (A): The von Mises criterion predicts no yielding under purely hydrostatic stress.
Reason (R): The criterion is based on distortion energy rather than total strain energy.
Select the correct answer from the options below.
Answer: C
Both statements are true and the second is the reason for the first. Hydrostatic stress changes volume without distorting the material, and experiment confirms that metals can sustain very large hydrostatic pressures without yielding.
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