1 THERMAL STRESSES Temperature change causes thermal strain
Constraints cause thermal stresses Thermo-elastic stress-strain
relationship (a) at T = T ref (b) at T = T ref + T No stress, no
strain No stress, thermal strain Thermal stress, no strain L L LL
Thermal expansion coefficient
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2 THERMAL STRESSES in FE Force-displacement relation Finite
element equation For plane truss, transform to the global coord.
Thermal force vector
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3 SUPERPOSITION APPROACH.
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4 TWO-BAR TRUSS EXAMPLE Element 1 is heated Will it be in
compression? Tension? No stress? What about Element 2? Thermal load
Solve!