Длительная прочность клапана высокого давления с учетом неоднородного распределения температуры

Abstract

The unisothermal theory of long-term strength is considered on the basis of continuum damage mechanics. The model of Kachanov-Rabotnov-Hayhurst is extended to the case of variable temperature. Both the creep and the damage rates are complemented by temperature dependences of Arrenius. The resulting non-isothermal creep-damage constitutive model is incorporated into the FE-code of the universal CAE-system ABAQUS. The numeral calculation of long-term strength of three-dimensional model of corps of bypass valve of steam turbine is executed. The time rupture and the law of redistribution in the corps of valve of basic parameters of creep and damage are determined.