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Unformatted text preview: 1 20022003, L.D. Sturges EM 324 Mechanics of Materials Thermal Strain Most engineering materials expand when heated and contract when cooled (when unrestrained ). The strain due to thermal effects is T T = where The thermal strain is the same in every direction . is the coefficient of thermal expansion . 20022003, L.D. Sturges EM 324 Mechanics of Materials Thermal Strain (cont) total T = + Strains caused by temperature changes and strains caused by stresses are essentially independent. The total strain is then or 20022003, L.D. Sturges EM 324 Mechanics of Materials Thermal Strain (cont) y x z x T E E E = + y x z y T E E E = + y z x z T E E E = + total T = + 2 20022003, L.D. Sturges EM 324 Mechanics of Materials Uniaxial Loading y z = = When a body is stressed in one direction (the xdirection) only, The stressstrain equations become x...
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This note was uploaded on 03/27/2008 for the course EM 324 taught by Professor Boylan during the Spring '08 term at Iowa State.
 Spring '08
 Boylan
 Strain

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