Numerical simulation of stress determination coefficients for indentation strain-gage method

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.