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Barely visible impact damage is a concern because

  • A.It is easy to see and therefore always repaired
  • B.It only affects tensile strength
  • C.It disappears over time
  • D.It cuts compressive strength yet hides

Answer: D

A tool dropped on a panel can delaminate a substantial area while leaving little surface mark. Since the reduction in compression strength can be forty per cent or more, design allowables are set assuming such damage is present and undetected.

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