Effect of ultrasonic vibration modes on the residual stress relaxation and mechanical properties of aluminum alloy

Abstract

In this work, the effect of ultrasonic vibration modes on the mechanical properties and relaxation of residual stress in 6061-T6 aluminum alloy was studied. A new ultrasonic vibration Johnson-Cook model was proposed, and the relaxation and distribution of residual stress under ultrasonic vibration were predicted and analyzed using the finite element method (FEM). The mechanical properties of 6061-T6 aluminum alloy under different ultrasonic vibration modes were analyzed through experiments involving notched specimen tensile testing and scanning electron microscopy (SEM) analysis. The findings indicate that ultrasonic vibration treatment during deformation, unloading, and load-holding, as well as treatment with its natural ultrasonic frequency, can effectively release residual stress; however, treatment with its natural frequency has the highest rate of release up to 65.4%. Ultrasonic vibration treatment during deformation better inhibits fracture under the same conditions. The FEM results are in good agreement with the experimental results, and it can be used as a valid tool for predicting residual stress release under ultrasonic vibration.

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