3501-14 - Thermal Stresses in Materials Fact: 1) Most...

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Thermal Stresses in Materials Fact: 1) Most materials tend to ________ with an increase in temperature and tend to _________ with a decrease in temperature. 2) Changes in temperature will cause changes in ___________ and/or induced thermal _________ in a structural element. Thermal Stress Analysis Involves the computation for: 1) The changes in ________ 2) The induced thermal _________ Basic Principle If the temperature of a bar of length L is raised from t o to t, the thermal expansion is: δ t = α L (t - t o ) = α L t where: α - coefficient of thermal expansion ( / º F or / º C) Thermal strain: ε t = δ t / L = α∆ t COEFFICIENT OF THERMAL EXPANSION ( α ) Concrete 4 - 8 X 10 -6 / ºF Concrete made w/ FL limestone 4.5 - 6.7 X 10 -6 / ºF Steel 6.5 X 10 -6 / ºF Aluminum 12 X 10 -6 / ºF Copper 9 X 10 -6 / ºF Wood (pine) parallel to grain 3 X 10 -6 / ºF perpendicular to grain 2 X 10 -6 / ºF
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Thermal expansion due to a temperature change of t for a bar of length L If the bar is restrained from movement at the two ends, there
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This note was uploaded on 05/26/2011 for the course CGN 3501 taught by Professor Mang during the Fall '10 term at University of Florida.

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3501-14 - Thermal Stresses in Materials Fact: 1) Most...

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