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Homework Lecture 3

Homework Lecture 3. Try to answer all questions Save your answers in the powerpoint show, making your name part of the filename, and email the file to me (j.h.kuiper@keele.ac.uk) I will check and pass comments Good luck! Jan Herman Kuiper.

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Homework Lecture 3

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  1. Homework Lecture 3 • Try to answer all questions • Save your answers in the powerpoint show, making your name part of the filename, and email the file to me (j.h.kuiper@keele.ac.uk) • I will check and pass comments • Good luck! • Jan Herman Kuiper

  2. a) s = F/A, so s1 = F1/A1 and s2 = F2/A2 and therefore s1/s2 = (F1/F2)×(A2/A1) if F1=F2 and A1>A2, then s1/s2 = A2/A1 < 1 or s1 < s2 s/e = E, so e = s/E = F/(AE), so e1 = F1/(A1E1) and e2 = F2/(A2E2), and therefore e1/e2 = (F1/F2)×(A2E2/A1E1) if F1=F2 and A1>A2, but we don’t know anything about E1 and E2, we cannot determine whether e1 is < or = or > e2 Try (b) yourself!

  3. Material ___ is the stiffest Material ___ is the strongest Material ___ is the most brittle Material ___ is the most flexible Material ___ is the least tough Material ___ is the most plastic Material ___ carries most load elastically

  4. (this is the 0.2% offset strain we talked about!)

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