锻压技术

基于改进本构模型的超声辅助渐进成形仿真研究

英文标题：Research on simulation of ultrasonic-assisted incremental forming based on improved constitutive model

单位：山东大学

分类号：TG386

出版年,卷(期):页码：2019,44(6):81-87

摘要：

在渐进成形加工中施加高频振动会引起被加工材料的塑性性能改变，并产生软化现象，从而降低加工过程中所需的成形力。首先，基于晶体塑性理论建立了描述金属塑性变形过程中应力-应变关系的理论模型，通过调整位错密度演化和热激活过程体现了超声施加后的声软化效应，构建了超声辅助成形加工时材料的本构模型。基于改进后的本构模型，通过ANSYS/LS-DYNA软件，对超声辅助渐进成形过程进行仿真模拟，获得了成形过程中成形力随成形深度的演变规律。通过超声辅助点成形实验，识别了本构模型参数并验证了仿真模拟结果，获得在一定频率下施加不同振幅时成形力的变化曲线。结果表明，在仿真时使用考虑软化效应的本构模型能获得更好的成形力预测效果。

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.

基金项目：

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

参考文献：

［1］Yang C, Shan X, Xie T. Titanium wire drawing with longitudinal-torsional composite ultrasonic vibration
［J］. International Journal of Advanced Manufacturing Technology，2016, 83(1-4): 645-655.

［2］Daud Y, Lucas M, Huang Z. Superimposed ultrasonic oscillations in compression tests of aluminium
［J］. Ultrasonics，2006, 44(8): e511-e515.

［3］翟维东, 陈晓晓, 李燕乐, 等. 超声振动对渐进成形过程成形力的影响
［J］. 锻压技术, 2018，43(8):80-84.

Zhai W D, Chen X X, Li Y L, et al. Influence of ultrasonic vibration on forming forces in incremental forming
［J］. Forming ＆ Stamping Technology, 2018,43(8):80-84.

［4］Vahdati M, Mahdavinejad R, Amini S. Investigation of the ultrasonic vibration effect in incremental sheet metal forming process
［J］. Proceedings of the Institution of Mechanical Engineers Part B:Journal of Engineering Manufacture, 2015, 231(6):1-12.

［5］Li P, He J, Liu Q, et al. Evaluation of forming forces in ultrasonic incremental sheet metal forming
［J］. Aerospace Science and Technology，2017, 63: 132-139.

［6］仲崇凯，管延锦，姜良斌，等. 金属超声振动塑性成形技术研究现状及其发展趋势
［J］. 精密成形工程, 2015,7(1): 9-15.

Zhong C K， Guan Y J， Jiang L B， et al．Research status and development trend of ultrasonic-vibration assited metal plastic forming
［J］. Journal of Netshape Forming Engineering, 2015,7(1): 9-15.

［7］Siddiq A, Ghassemieh E. Theoretical and FE analysis of ultrasonic welding of aluminum alloy 3003
［J］. Journal of Manufacturing Science and Engineering，2009, 131(4): 481-498.

［8］Siegert K, Ulmer J. Influencing the friction in metal forming processes by superimposing ultrasonic waves
［J］. CIRP Annals-Manufacturing Technology, 2001,50(1):195-200.

［9］Langenecker B. Effects of ultrasound on deformation characteristics of metals
［J］. IEEE Transactions on Sonics & Ultrasonics，1966, 13(1): 1-8.

［10］Siddiq A, El S T. Ultrasonic-assisted manufacturing processes: Variational model and numerical simulations
［J］. Ultrasonics，2012, 52(4): 521-529.

［11］Yao Z, Kim G Y, Wang Z, et al. Acoustic softening and residual hardening in aluminum: Modeling and experiments
［J］. International Journal of Plasticity，2012, 39: 75-87.

［12］Deshpande A, Hsu K. Acoustic energy enabled dynamic recovery in aluminium and its effects on stress evolution and post-deformation microstructure
［J］. Materials Science and Engineering: A，2018, 711: 62-68.

［13］Frost H J, Ashby M F. Deformation-mechanism Maps: The Plasticity and Creep of Metals and Ceramics
［M］. Oxford：Pergamon Press, 1982.

［14］Kocks U F. Constitutive Behavior Based on Crystal Plasticity
［M］. New York：Elsevier Applied Science, 1987.

［15］Kocks U F. Laws for work-hardening and low-temperature creep
［J］. Journal of Engineering Materials and Technology, 1976, 98(1):76-85.

［16］Zhou H Y, Cui H Z, Qin Q H. Influence of ultrasonic vibration on the plasticity of metals during compression process
［J］. Journal of Materials Processing Technology, 2018, 251: 146-159.

［17］Huang H, Pequegnat A, Chang B H, et al. Influence of superimposed ultrasound on deformability of Cu
［J］. Journal of Applied Physics,2009, 106(11): 1144-1198.

［18］Long Y, Li Y, Sun J, et al. Effects of process parameters on force reduction and temperature variation during ultrasonic assisted incremental sheet forming process
［J］. International Journal of Advanced Manufacturing Technology, 2018, 97(1-4):1-12.

［19］Malygin G A. Acoustic plastic effect and the stress superimposition mechanism
［J］. Physics of the Solid State, 2000, 42(1): 72-78.

［20］王家鹏，赵震，庄新村，等. 超声振动辅助成形本构模型
［J］. 塑性工程学报. 2015, 22(6): 1-6.

Wang J P, Zhao Z, Zhuang X C, et al. Study on constitutive model of ultrasonic vibration assisted forming
［J］. Journal of Plasticity Engineering, 2015, 22(6): 1-6.

服务与反馈：

【文章下载】【加入收藏】