Discussion
Consider the following statements about impact damage in composites:
1. Barely visible damage can substantially reduce compressive strength.
2. Design allowables assume such damage may be present undetected.
3. Impact damage is always obvious on the surface.
Which of the statements given above is or are correct?
Answer: D
Correct answer: 1 and 2 only
Statements 1 and 2 describe the design consequence correctly: barely visible impact damage cuts compressive strength substantially, and allowables assume it may be present and undetected. Statement 3 is what makes the problem serious - a dropped tool can delaminate the interior while leaving a surface mark that inspection will not reliably find.
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