Abstract
Theories of thermal stability for high-temperature materials based on the application of static thermoelasticity equations to nonstationary thermal processes are reviewed. A new criterion for thermal stability, R = ΔTd, is proposed. Anew model, based on the maximum stress theory and the quantum theory of thermal field, is proposed; in terms of this model, the stress-strain state of a solid subjected to thermal shock can be determined by solving equations of thermal strength and heat conduction with allowance made for inertial terms in thermal stability equations. Thermostability is considered as a physical parameter characterizing the resistance of materials to failure in a nonstationary temperature field.
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