摘要
针对铝合金板材渐进成形过程中材料受拉失稳产生韧性破裂的问题,建立考虑应变率效应的铝合金板材渐进成形韧性破裂准则。采用单向拉伸试验和有限元模拟相结合的方法,确定了铝合金板材渐进成形韧性破裂准则中的材料参数。以建立的破裂准则为破裂判断的依据,结合有限元软件MSC.Marc进行二次开发,通过嵌入韧性破裂子程序,实现了对1060铝合金板材渐进成形破裂过程的定量分析,并通过渐进成形试验进行了试验验证。结果表明,考虑应变率效应的韧性破裂准则适用于铝合金板材渐进成形破裂缺陷的预测,揭示了铝合金板材渐进成形过程中破裂产生的机制,有限元模拟结果与实验结果一致性较好。
In order to solve the problem of tensile failure of materials during the process of aluminum alloy sheet metal forming process,a rule for the fracture of aluminum alloy sheet metal forming with strain rate effect was established.The material parameters of the alloy sheet incremental forming toughness fracture criterion were determined by the method of uniaxial tensile test and finite element simulation.Based on the fracture criteria established,and the second development of the finite element software MSC.Marc,by embedding ductile fracture subprogram,the quantitative analysis of the fracture process of 1060 aluminum alloy sheet was realized,the experimental verification was carried out by incremental forming test.The results show that the ductility fracture criterion considering the strain rate effect is applicable to the prediction of the fracture defect of aluminum alloy sheet,the mechanism of fracture in the incremental forming process of aluminum alloy sheet is revealed.In addition,the simulation results are in good agreement with the experimental results.
作者
杨琴
蔡改贫
黄信建
刘道修
许永强
YANG Qin;CAI Gaipin;HUANG Xinjian;LIU Daoxiu;XU Yongqiang(School of Mechanical & Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《铸造技术》
CAS
2018年第7期1511-1515,共5页
Foundry Technology
基金
国家自然科学基金项目(50975131)
江西省自然科学基金项目(20132BAB206013)
关键词
韧性破裂准则
铝合金板材
应变率效应
渐进成形
数值模拟
ductile fracture criterion
aluminum alloy sheet
strain rate effect
incremental forming
numericalsimulation