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压痕应变法应力计算常数的数值模拟
陈静, 阚盈, 姜云禄, 陈怀宁
作者单位E-mail
陈静, 阚盈, 姜云禄, 陈怀宁  cj@imr.ac.cn 
摘要:
压痕应变法是不依赖于材料的物性参数而最接近无损的一种应力测试方法,目前其应用的最大问题是应力计算常数的获得. 文中通过对动态压入材料的特性分析,以无应力下的应变增量试验数据为依据,基于传统拉伸曲线,针对不同材料动态确定合理的压入载荷,建立了适用于大多数金属材料的标定模型.结果表明,该模型所获得的标定曲线稳定可靠,规律性和准确度均优于传统的试验标定结果,基本可以代替传统的标定试验.
关键词:  压痕应变法|残余应力|应力计算常数|试验标定|数值模拟
DOI:10.12073/j.hjxb.2019400029
分类号:
基金项目:
Numerical simulation of stress determination coefficients for indentation strain-gage method
CHEN Jing, KAN Ying, JIANG Yunlu, CHEN Huaining
Abstract:
Indentation strain-gage method is one of basically non-destructive stress determination methods, which is independent of metallic material physic properties. Currently, to obtain stress determination coefficients is the biggest problem. The material dynamic characteristics were analyzed, a precise indentation load was determined based on conventional tensile curve and the experimental strain increment with stress free. A finite model for calibration test was set up successfully, which can be used to obtain the stress determination coefficients for most metallic materials. The results showed that the calibration curve obtained from the model was reliable and stable, which may essentially replace the calibration test for its regularity and accuracy were both superior to experiment results.
Key words:  indentation strain-gage method|residual-stress|stress determination coefficient|calibration test|numerical simulation