Modelling nano-indentation of ion-irradiated FCC single crystals by strain-gradient crystal plasticity theory
作者： Xiazi Xiao , Lirong Chen , Long Yu , Huiling Duan
DOI: 10.1016/J.IJPLAS.2019.01.005
关键词: Softening 、 Nanoindentation 、 Hardening (metallurgy) 、 Composite material 、 Indentation 、 Constitutive equation 、 Materials science 、 Irradiation 、 Ion 、 Single crystal
摘要: Abstract In this work, a strain-gradient crystal plasticity theory with irradiation effect is proposed for the surface nano-indentation of ion-irradiated FCC metals. order to characterize indentation size and hardening materials indented by Berkovich indenter, contributions geometrically necessary dislocations non-uniformly distributed defects are incorporated into classical theory. The constitutive equations implemented ABAQUS through user material subroutine VUMAT numerically simulate single copper. theoretical model calibrated comparing numerical results experimental data. Both simulated force-depth relationship without hardness-depth with/without can match well corresponding dominant features as observed in be effectively characterized framework, which include effect, depth-dependent hardening, unirradiated substrate softening effect. Moreover, evolution different mechanisms during systematically analyzed help understand macroscopic deformation behavior.
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