Calibration and plastic correction of residual stress strain release coefficient for 5083 aluminum alloy

Based on the basic principle of testing residual stress using blind hole method, experimental calibration and plastic correction research were conducted on the strain release coefficients A and B of 5083 aluminum alloy material. The results indicated that when the stress was below 0.6 times the yield strength, the strain release coefficients A and B remained relatively stable. When the stress exceeded 0.6 times the yield strength, A and B showed a significant downward trend. After the implementation of the correction, the absolute value of the relative error within the entire stress range could be controlled within 3.62%. Compared with the calculation results before correction, the testing accuracy had been significantly improved.