Transactions of Materials and Heat Treatment

Title：Research on simulation of ultrasonic-assisted incremental forming based on improved constitutive model

Authors： Chen Xiaoxiao Xu Changxu Cheng Zinan Li Yanle Li Fangyi Li Jianfeng

Unit： Shandong University

KeyWords： acoustic softening constitutive model incremental forming finite element simulation ultrasonic vibration

ClassificationCode：TG386

year,vol(issue):pagenumber：2019,44(6):81-87

Abstract：

Applying high-frequency vibrations during the incremental forming process can cause plastic properties changes of the processed material and a softening phenomenon, thereby reducing the forming force required during processing. Firstly, a theoretical model describing the relationship between stress and strain during the metal plastic deformation process was established based on the theory of crystal plasticity, and the material constitutive model during the ultrasonic-assisted forming was constructed by the acoustic softening effect of ultrasonic application produced thought adjusting the dislocation density evolution process and the thermal activation process. Then, based on the improved constitutive model, the ultrasonic-assisted incremental forming process was simulated by software ANSYS/LS-DYNA, and the evolution of forming force changing with the forming depth during the forming process was obtained. Furthermore, the constitutive model parameters were identified and the simulation results were verified by the ultrasonic-assisted point-forming experiments, and the curve of forming force changing with different amplitudes under a certain frequency was obtained. The results show that the constitutive model considering the softening effect can improve the prediction accuracy of the axial forming force.

Funds：

国家自然科学基金青年项目(51605258)；山东省博士后创新项目(201701011)；山东大学青年学者未来计划(2018WLJH55)

陈晓晓（1994-），女，硕士研究生 E-mail：17862973880@163.com 通讯作者：李燕乐（1989-），男，博士，副研究员 E-mail：yanle.li@sdu.edu.cn

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