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Homework Help: The compressive longitudinal strain

  1. Jan 6, 2012 #1
    Hello,

    is the strain defined as the absolute deformation to the initial ? i.e is it always positive ??

    If Yes , then poission's ration is negative for compression of ordinary materials ?
     
  2. jcsd
  3. Jan 6, 2012 #2
    Strain is defined as belowl

    e = (a - b)/b

    where b is original length and a is the stressed length. So it can be negative for compressive loading. Absolute does not mean |absolute value|.
     
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