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State whether the following is true or false.
Proof testing can weaken the components that survive it.

  • A.False
  • B.True only at large scales
  • C.False only at small scales
  • D.True

Answer: D

Slow crack growth under the applied load can extend a subcritical flaw, so a survivor may be nearer to failure than before. The test load and its duration are chosen with that in mind. Too severe a proof test does more harm than good.

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