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Ceramic strength shows a size effect in which larger specimens are

  • A.stronger, since they carry the load over more area
  • B.identical in strength to small ones
  • C.unaffected by any flaws they contain
  • D.weaker, since they contain more potential flaws

Answer: D

A larger volume is more likely to contain a severe flaw, so the expected strength falls with size. Extrapolating from small test bars to a large component without allowing for this overestimates what the component will bear.

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