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A steel railroad track Es200 GPA αs11710-6oC was laid out at a temperature of 6oC Determine the normal stress in the rails when the temperature reaches

A steel railroad track (Es=200 GPA, αs=11.7x10-6/oC) was laid out at a temperature of 6/oC. Determine thenormal stress in the rails when the temperature reaches 48oC assuming that the rails (a) are welded to form a continuous track (b) are 10m long with 3mm gaps between them.

 

I found (a). σ=98.28MPa ...That one was easy but I can't figure out how to solve for (b) without the Area. I've tried to manipulate the problem to cancel out theArea since I don't have it but then it also cancels out the length so I get the same answer as (a), which isn't correct

Apr 27 2020 View more View Less

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