Problem 112 in the
NCEES Mechanical Practice Exam for Machine Design & Materials has been one of the more troublesome NCEES MDM Practice Exam problems for our participants. The solution begins with an equation that results in questions like "where did that come from?" When I first looked at the solution I had the same question. What is lacking is a statement up front that the change in length of the bar must equal the change in length of the spring. The bar gets longer because of the increase in temperature, but it simultaneously gets shorter because of the increase in the force in the spring. Once you do that, you get the equation they started with. This is actually a great problem, and I hope my explanation helps you to understand all its fundamental concepts. - Dr. Tom
Dr. Tom’s Solution to Mechanical: Machine Design & Materials NCEES Problem 112
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