Affiliation:
1. Siemens AG
2. NTU “Kharkov Polytechnic Institute”
3. Martin-Luther-University Halle-Wittenberg
Abstract
The constitutive equation for the creep deformation rate, as well as the kinetic equations for hardening, recovery and damage processes, with a continuous functional dependence on temperature, are proposed. The material model is able to describe the primary, secondary and tertiary stages of creep behavior. The technique for the identification of parameters in the uniform model is developed on the basis of experimental creep curves for a wide range of temperatures and stresses. The parameter fitting for a creep-damage model with temperature dependence is carried out for one typical heat-resistant steel widely used in the power plant industry. Numerical results are obtained by the Finite-Element-Method for a real power plant component using the ABAQUS code and incorporated user-defined materials routines.
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