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Homework Help: Elastomer stretched in tension and elongation

  1. Aug 6, 2009 #1
    1. The problem statement, all variables and given/known data

    A strip of elastomer was stretched in tension and elongation and was held constant. After 10 minutes the tensile stress in the specimen dropped by 12%. Assuming that the elastomer behaves in accordance with the maxwell model:

    (i) Calculate the relaxation time (to the nearest whole number)
    (ii) Show that it takes 22 minutes for the stress to drop to 75% of its final value.

    2. Relevant equations

    3. The attempt at a solution

    I take it we have to use the maxwell model equation here?

    sigma (t) = sigma (0) e ^ -t/tau
  2. jcsd
  3. Aug 6, 2009 #2


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    Staff Emeritus
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    I think so. Based on the information in the problem statement, what is the ratio,

    sigma(t) / sigma(0),​
    when t=10 minutes?
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