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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
作者:陈晓晓 徐长续 成梓楠 李燕乐 李方义 李剑峰 
单位:山东大学 
关键词:声软化 本构模型 渐进成形 有限元仿真 超声振动 
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)
作者简介:
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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