Thermal stresses in functionally graded materials caused by a laser thermal shock |
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Authors: | T Elperin G Rudin |
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Institution: | (1) Department of Mechanical Engineering Pearlstone Center for Aeronautical Engineering Studies Ben-Gurion University of the Negev P.O. Box 653, Beer-Sheva 84105 Israel, IL |
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Abstract: | Mathematical simulation of a thermal shock method for reliability testing of functionally graded material (FGM) is performed
with the end to determine operating parameters of the testing device (power of a laser, laser beam radius, duration of heating)
and to investigate the effect of the composition of FGM on a magnitude of thermal stresses in a coating. An analytical method
for solution of the thermal elasticity problem is developed whereby the approach of a multilayer plate is used for determining
temperature and thermal stresses distributions in a coating. We considered the limiting case of the obtained solution when
the thickness of a layer is infinitesimally small and the number of layers tends to infinity. This procedure allowed us to
obtain the thermal stresses distribution in a FGM coating. The results for the FGM coating composed of WC (tungsten carbide)
ceramics and HS-steel are presented. It is showed that variation of the volume content of ceramics strongly affects thermal
stresses in a coating and they decrease significantly in the case of the uniform spatial distribution of ceramics.
Received on 21 November 2000 / Published online: 29 November 2001 |
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