Ultrasonic Nondestructive Testing Technology for Residual Stresses of Aluminum Alloy Plates

This paper aims at the problem of poor dimensional stability of the aluminum alloy plates due to residual stress during the bending process, ultrasonic critical refraction longitudinal wave method was used for detection. By measuring the residual stress distribution state of the plate in different directions, the cause of product deformation is proposed, and reliable data support is provided for the dimensional deformation law of the plate in different directions. The results show that by non-destructively measuring the residual stress distribution state of the plate during the bending process, the stress distribution state of the plate can be accurately obtained, which plays an important role in the analysis of the cause of the plate deformation.