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考虑运动硬化的DD3镍基合金力学行为研究

Research for the mechanics behavior of DD3 Ni-base Alloy with kinematic hardening effect

  • 摘要: 详细介绍了镍基合金的晶体塑性本构模型,在Asaro大变形晶体塑性框架下,详细介绍了镍基合金的晶体塑性本构模型,在Asaro大变形晶体塑性框架下,引入了运动硬化规律,考虑了温度和应变率对晶体塑性变形的影响,通过针对每个滑移系考虑屈服准则和流动规律建立了晶体塑性模型. 对积分过程进行了推导,通过编写ABAQUS材料用户子程序(UMAT), 实现本构模型的有限元积分算法. 在此基础上模拟了DD3镍基单晶合金在单轴拉伸和循环载荷下的响应,并与实验数据进行了对比. 利用该模型可以很好地模拟镍基单晶所具有的各向异性特性,体现了镍基单晶在循环载荷作用下的拉-压不对称性.

     

    Abstract: In the present paper, we describe the details of aplasticity constitutive model for nickel-based alloy crystal. Under the Arso(1983) crystal plasticity framework, the constitutive model involves thekinematic hardening rule, and also takes into account the temperature andstrain rate on the impact of crystal plastic deformation. In theconstitutive model, the yield criterion and flow rule are built onindividual slip system. We have derived the integral method of theconstitutive model, and implement the finite element integral algorithm ofthe constitutive model as a user material subroutine (UMAT) in ABAQUS.Moreover, we simulate the stress-strain response of DD3 Ni-base alloy underuniaxial tension and cyclic loadings on different crystal orientations.Compared with the corresponding experiment data, we find that this model isable to accurately describe the anisotropic deformation response of theNi-base single crystal, and could also capture the tension-compressionasymmetry of the cyclic plastic deformation of the Ni-base alloy singlecrystal.

     

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