Неизотермическая ползучесть и повреждаемость элементов паровых турбин

Abstract

The conventional Kachanov-Rabotnov-Hayhurst type continuum damage mechanics creep model is extended to the case of variable temperature and strain hardening consideration. Both the creep and the damage rates are assumed temperature dependent. A technique for the identification of material creep constants based on the available family of experimental creep curves is presented. The resulting non-isothermal creep-damage constitutive model is incorporated into the FE-code of the universal CAE-system ABAQUS. Moreover, an example for a pressurized pipe exposed to the non-uniform heating is shown to illustrate basic features of creep-damage character in thick-walled structural components