In order to accurately describe the deformation behaviors of lightweight thin-walled components during ultrasonic vibration-assisted forming,ultrasonic vibration normal excitation-assis-ted uniaxial tensile experiments were carried out with TU1 oxygen-free copper and 316L stainless steel.Considering the ultrasonic vibration softening effects,an ultrasonic vibration Johnson-Cook model was developed by introducing a new ultrasonic softening function.A subroutine was developed and embedded into finite elements for simulation,and was validated by comparison with unidirectional tensile and curling experiments.The results show that the numerical model may effectively capture the ultrasonic vibrational softening behaviors of the materials with an average absolute percentage er-ror as low as 0.97％.Although different materials have different sensitivities to ultrasonic vibration,the ultrasonic softening rates all follow an Allometricl functional relationship with the ultrasonic energy field density.
关键词
超声振动/Johnson-Cook模型/超声软化/有限元仿真
Key words
ultrasonic vibration/Johnson-Cook model/ultrasound softening/fimite element sim-ulation
维普
万方数据