Research on Residual Stress Measurement Technology of Aluminum Alloy Plate Based on Modified Layer Removal Method

According to the distributing characteristic of residual stresses in aluminum alloy plate, this paper adopted modified layer removal method (MLRM) to measure it; based on elastic mechanics theory the solving process was deduced. Using finite element method the process of MLRM was simulated, by loading specimen with a known original stress distribution the stress was worked out with strain datum from simulation and the application range of MLRM was analyzed. With this method, residual stresses in quenched aluminum alloy plate and corresponding pre-stretched plate were measured. The results show that the method can measure residual stresses in aluminum alloy plate briefly and effectively and it has strong engineering practicality.