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Stress strain curve problem

  1. Mar 17, 2013 #1
    1. The problem statement, all variables and given/known data

    hey all

    i am try to find the the concrete stress strain curve according to paper with i attached (i highlight the main equation with red)

    Mainly there is 3 parts, the first part is linear and the second part is curve according to the equation.

    My question the two parts don't meet at the same point so this will create the graph the i did in excel

    So could any one help me
    AND if it do , how can i solve it

    http://img163.imageshack.us/img163/3200/ffffn.png [Broken]
    Last edited by a moderator: May 6, 2017
  2. jcsd
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