Non-local modeling of thermal shock damage in refractory materials |
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Authors: | F. Damhof W.A.M. Brekelmans |
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Affiliation: | a Corus Research Development and Technology, P.O. Box 10000, 1970CA Ijmuiden, The Netherlands b Faculty of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513, 5600MB Eindhoven, The Netherlands |
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Abstract: | A non-local damage framework has been coupled with heat transport to model transient thermo-mechanical damage (in particular thermal shock) in refractory materials. The non-locality, to be dealt with to obtain an adequate problem formulation, is introduced by terms accounting for micro-structural strain gradients induced by transient temperature gradients. The parameters figuring in the evolution law for elasticity-based damage are temperature dependent. Damage due to isotropic thermal expansion has been accounted for by proposing a new evolution law. A single variable for the total damage is obtained by combining both damage mechanisms. The influence of non-locality and transient temperature gradients within non-locality is investigated in numerical examples. The phenomenological relevance of the framework is verified by modeling of experiments, which simulate thermal shock under process conditions. |
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Keywords: | Damage mechanics Ceramics Failure assessment Structural assessment Higher order continuum |
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