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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。
A high-order damage tensor method was used to design the anisotropic constitutive model of the DZ22 directional solidification superalloy. The anisotropic constitutive model was designed by Hill anisotropy theory and Norton energy criterion and programmed by ANSYS software. And compared it with the uniaxial creep tests and the constitutive model simulations of the isotropic creep of Kachanov-Rabotnov (K-R), respectively. The parameterized creep behavior based on material orientation was also studied. The results show that the creep strain simulation results are very accurate and suitable for use as a type of anisotropic creep constitutive model of superalloy.