Experimental Study of Surface Residual Stress Relaxation on Edge of Al Alloy Thick Plate
Surface residual stress distributions and general rules on the edge region of quenched and sawed aluminum alloy thick plates were acquired by analyzing stresses edge effect using X-ray diffraction method.The results show that quenching and sawing cause similar residual stress distribution trends on the edge of the thick plates.But edge stresses distribution after quenching demonstrates some singularity since quenching contains huge heat exchange and rapid cooling,while stresses distribution after sawing is relatively uniform because heat exchange is negligible and stresses reconstruction is slow in sawing.In addition,stress relaxation range is related to the plate thickness and the degree of stress relaxation is influenced by technologies changing the initial stresses distributions,plate dimensions and constraint types.