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October 25, 2014

Homework Help: Mechanics of Materials

Posted by Claire on Saturday, March 6, 2010 at 6:55am.

A railroad is laid so that there is no stress in the rails at 20 degrees celcius. Calculate the stress in the rails at -6 degrees celcuis if all the contraction is prevented. Take E=206GPa and linear coefficient of expansion is 12 x 10^(-6) /deg celcius. If, however, there is 6mm allowance for contraction per rail, what is the stress at -6 deg celcius if the rails are 27m long.

The answers should be 64.3 MPa, and 18.5 MPa.

I managed to get the first answer. However, I don't know how to continue. Can someone please help me? Thanks!

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