Abstract
The Hollomon hardening model is introduced into the wave equation of ultrasound and the ultrasonic nonlinear parameter βn based on hardening index n is obtained. Subsequently, tensile tests and ultrasonic nonlinear tests are carried out on AA6061-T6 aluminum alloy specimens under different pre-deformations and strain rates. The results show that under unloading condition, the normalized βn based on n and the normalized βtest based on ultrasonic nonlinear test both increase with the increasing pre-deformation and strain rate. The growth rate of the former is about 77% of the latter. The results show that it is possible to evaluate the hardening state of materials quantitatively based on ultrasonic nonlinear technology.
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