哈尔滨工程大学学报2018，Vol.39Issue(5)：825-830,6.DOI:10.11990/jheu.201610094
Pile-up现象对材料本构关系反演计算的影响
Influence of Pile-up on reverse analysis of constitutive relationship of materials
摘要
Abstract
In this study,we investigated the impact of Pile-up behavior on the mechanical parameters of materials and performed an inverse computation of the constitutive relation to determine the effect of neglecting Pile -up in commercial nanoindentation tests.First,we deduced the energy method theory.We selected five different materials for the nanoindentation test, and used the commercial Oliver-Pharr and energy methods to compute the hardness and elastic modulus,respectively.In addition,we compared the test error rates.Next,we deduced the theory un-derlying the limit analysis approach and performed inverse calculation to obtain a strain-stress curve for the Pile-up of the material.We then simulated the nanoindentation process based on the computation result.The nanoindenta-tion test results show that when the ratio of the residual indentation depth to the indentation depth is greater than 0.7,the impact of Pile-up on the test result is obvious when using the commercial Oliver-Pharr method.In addi-tion,we found the error rates of the elastic modulus and hardness to both be above 20%.The inverse computation was performed to determine the constitutive relation of materials with large plastic deformation,and both the theoret-ical computation and simulation results confirmed that Pile-up affects the stress-strain curve.These results provide a reference for the inverse computation of the constitutive relation in nanoindentation tests.关键词
能量法/纳米压痕测试/极限分析法/Pile-up现象/反演分析/本构关系/有限元分析/量纲分析Key words
energy method/nonoindentation test/limit analysis approach/Pile-up behavior/reverse analysis/con-stitutive relation/finite element analysis/dimensional analysis/Oliver-Pharr method分类
数理科学引用本文复制引用
王月敏,闫相桥,李垚..Pile-up现象对材料本构关系反演计算的影响[J].哈尔滨工程大学学报,2018,39(5):825-830,6.基金项目
国家自然科学基金项目(51572058,91216123). （51572058,91216123）
