DZ22合金的各向异性蠕变损伤本构模型的建立及数值分析

Anisotropic Creep Constitutive Model of DZ22 Alloy and Numerical Analysis

采用一种高阶损伤张量的方法,对于DZ22定向凝固高温合金材料的一级和二级蠕变,采用Hill各向异性理论和Norton能量准则设计各向异性本构模型,采用ANSYS软件编程。并且将它分别与单轴蠕变试验以及Kachanov-Rabotnov(K-R)的各向同性蠕变的材料本构模拟结果进行比较,同时研究了基于材料取向的参数化蠕变行为。结果表明,蠕变应变模拟的结果非常准确,适用于作为高温合金的各向异性蠕变本构的一种类型。

By means of an advanced tensorial damage method, a anisotropic constitutive model for the first and second creep process of DZ22 directional solidification superalloy was established according to Hill＇s anisotropic theory and Norton power law, using ANSYS software programming, and was compared with Kachanov-Rabotuov （K-R） isotropie constitutive and uniaxial static creep test. And the parameterized creep behavior of DZ22 superalloy was also researched based on material orientation. The results show that the model of the creep strain is accurate.