EAS209 L07_Problems involving temperature- spring 11

EAS209 L07_Problems involving temperature- spring 11 - EAS...

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EAS 209-Spring 2011 Instructors: Christine Human 1/18/2011 1 07-Problems involving temperature Lecture 7 Problems Involving Temperature Today’s Objectives: External loads are not the only sources of stress and strain in a structure. Changes in temperature will result in expansion or contraction of the material. If the structure is restrained, stresses will build up. Today we will consider the effect of temperature changes on both statically determinate and indeterminate structures. Today’s Homework: EAS 209-Spring 2011 Instructors: Christine Human 1/18/2011 2 07-Problems involving temperature Problems Involving Temperature Change Most structural materials expand with increasing temperature and contract with decreasing temperature The expansion resulting from thermal strain, T , is proportional to change in temperature, T T T =coefficient of thermal expansion (material property, = 6x10 -6 / o F for mild steel) If member is free, it will expand without any stress Isotropic materials expand uniformly in all directions Increased Temperature Based on thermal strain, thermal expansion of a rod along the member axis of length L is T =  TL
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EAS209 L07_Problems involving temperature- spring 11 - EAS...

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