Research Advances in Plastic Mechanism and Constitutive Modelling of Ultrasonic Vibration
Ultrasonic vibration-assisted molding technology is an emerging green molding technology at the crossroads of the energy field and the physical field,which is widely used in material processing because it can significantly improve the qual-ity of material molding and reduce the material molding defects.It is generally recognized that the volume effect,which leads to a decrease in the flow stress of the material,and the surface effect,which reduces interfacial friction,are the main mechanisms of the acoustic plasticity effect.The principles of advanced forming processes such as ultrasonic vibration-assisted drawing,deep drawing and progressive forming were outlined,and the process characteristics and research progress of three typical ul-trasonic plastic forming processes were summarized.On this basis,the bulk plasticity mechanisms such as stress superposition effect,acoustic softening effect,residual effect,and dynamic impact effect,and the surface plasticity mechanisms such as vector effect and localized thermal effect under the ultrasonic vibration-assisted plasticity mechanism were reviewed,and the research progresses of the ultrasonic vibration-assisted bulk plasticity mechanism and the surface plasticity mechanism were summarized,respectively.Secondly,the current research status of the intrinsic model in ultrasonic vibration-assisted plastic forming was re-viewed with focuses on both volume effects and surface effects,and the current research status of the intrinsic model under volume effects was summarized in terms of the image-only model and the physical model,while the research progress of the friction model under surface effects was summarized.Finally,the problems in the application of the ultrasonic vibration-assisted forming mechanism were summarized and the development direction was prospected.
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