A CRYSTAL PLASTICITY BASED CYCLIC CONSTITUTIVE MODEL FOR ALUMINUM ALLOY
A crystal plasticity based cyclic constitutive model is constructed in this paper to simulate the cyclic deformation of a rolled 5083Hlll aluminum alloy.The constitutive model is built in the single crystal scale, where a modified Armstrong-Frederick nonlinear kinematic hardening rule is employed to describe the Bauschingers effect.A simplified isotropic hardening law considering the interaction of dislocations between different slipping systems is also used.The proposed single crystal constitutive model is implemented numerically into finite element software through a user material subroutine (i.e., UMAT in ABAQUS).Then a two-dimensional polycrystalline finite element model considering the random grains geometric shapes and crystallographic orientations is constructed.The simulated results agree quite well with correspondent experimental ones, which indicate that the proposed constitutive model is capable of predicting the cyclic deformation of the prescribed face-centered cubic (FCC) polycrystalline metal properly, including the cyclic hardening, ratchetting, and their dependence on the applied load level.The model also shows the ability to simulate the local heterogeneous deformation in a single crystal scale.
Crystal plasticity Cyclic constitutive model Finite element Face-centered cubic crystal
Juan LUO Guo-zheng KANG Lei SUN Jia-cheng LUO
Nuclear Power Institute of China, Chengdu 610213, China School of Mechanics and Engineering, Southwest Jiaotong University, Chengdu 610031, China
国际会议
The 2017 Symposium on Piezoelectricity,Acoustic Waves and Device Applications(2017全国压电和声波理论及器件技术研讨会)
成都
英文
340-344
2017-10-27（万方平台首次上网日期，不代表论文的发表时间）