仪器化压入刚性压头有限元模型适用性问题分析

Analysis on the Applicability of Instrumented Indentation Finite Element Model with a Rigid Indenter

文中利用有限元软件ABAQUS分别对基于刚性压头和弹性压头的仪器化压入模型进行了建立与计算,并将刚性压头的模型仿真所得的压入比功We/Wt及仪器化压入Oliver-Pharr硬度HO-P与理想弹性压头的模型仿真结果进行对照。结果表明,刚性压头模型仿真识别压入比功We/Wt的相对误差变化范围为-2.6%^-31.8%,Oliver-Pharr硬度HO-P的相对误差变化范围为-0.3%~26.5%,其中对低强度材料进行仿真的结果与弹性压头模型相近,误差一般不超过5%,而随着材料强度的升高,其仿真误差显著增大,对于超高强度的材料的仿真计算压头弹性不可忽略,刚性压头模型应谨慎选用。

Using finite element software ABAQUS,the models of instrumented indentation test with a rigid and ideal elastic indenter are respectively established and calculated. Then the work ratio We/Wt and widely-used Oliver-Pharr hardness HO-P derived from the results of the model with a rigid indenter are compared with those of the model with an ideal elastic indenter. It＇s indicated that,the relative error of We/Wt of the rigid-indenter model,compared to that of elastic-indenter model, ranges from-2.6% to-31.8%,and the relative error of HO-P ranges from-0.3% to 26.5%. And the rigid-indenter model works relatively well on low-strength materials with relative errors under 5%,but for extra-high strength materials,the elasticity of indenter should not be neglected and the adoption of rigid-indenter model should be of discretion.