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Materials engineering help required please

  1. Mar 25, 2013 #1
    A tie rod of max strength and minimum mass performance index

    Max strength - τ= 2T/πr³

    Min mass- P=t^(2/3)/p

    I have been asked to explain how the performance index is affected by

    (i) safety factor
    (ii) changing the objective to minimum cost

    Any help would be greatly appreciated

    Thanks
     
  2. jcsd
  3. Mar 25, 2013 #2

    Astronuc

    User Avatar

    Staff: Mentor

    Safety factor on what? Stress? A key dimension?

    How does one define stress, and how does it relate to the dimensions.

    Then think what one does to minimize stress.


    To minimize cost, one minimizes material usage, e.g., with thinner load bearing sections.
     
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