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Mistake in the Unbrako guide to high temperatre bolted joints?

  1. Oct 23, 2012 #1
    Hi guys,

    Just wondering if anyone can confirm a mistake in the Unbrako guide to high temperature joints on page 3 (i.e. page 70) of the link at the bottom.

    The equation used to quantify the increased tensile stress in the bolt (second paragraph to the left of the page) does not seem right just by looking at the dimensions of the variables.

    I would expect the equation to be:
    [stress] = [youngs modulus] x [coefficient of thermal expansion] x [change in temperature]

    From simply substituting the strain:
    ([coefficient of thermal expansion] x [change in temperature] x [length of fastener])/[length of fastener]

    [stress] = [youngs modulus] x [strain]

  2. jcsd
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