摘要
以管材液压胀形工艺为研究对象,对常见的应变路径进行分类,采用"分段逼近"的数学简化方法,将复杂应变路径简化为分段应变路径。基于Swift分散性失稳准则建立了单一应变路径的管材液压胀形成形极限图;利用Hill集中性失稳准则建立了复杂应变路径下的成形极限图。通过对比不同应变路径下的管材液压胀形成形极限图,揭示了应变路径的改变对液压胀形的影响规律。通过管材液压胀形成形极限试验,验证了理论分析结果的正确性。理论分析和试验结果表明,不同应变路径下的管材液压胀形成形极限图的几何形状不同,极大地限制了由简单线性加载获得的成形极限图在分析复杂应变路径下的成形过程时的准确性。
Taking the hydraulic bulging process of tube as the research object,the common strain paths were classified,and the complex strain paths were simplified to stepwise strain paths using the mathematical simplification method of"stepwise approximation".The forming limit diagram of hydraulic bulging of tube under single strain path was established based on the Swift diffuse instability criterion.The forming limit diagram under complex strain path was established using Hill’s clustered instability criterion.By comparing the forming limit diagrams of hydraulic bulging of tube under different strain paths,the influence law of the strain path changing on hydraulic bulging was revealed.The correctness of the theoretical analysis results was verified by forming limit test of hydraulic bulging of tube.The theoretical analysis and test results show that the geometrical shapes of the forming limit diagrams of hydraulic bulging of tube under different strain paths are different,which greatly limits the accuracy of the forming limit diagrams obtained by simple linear loading in analyzing the forming process under complex strain paths.
作者
胡国林
潘春荣
HU Guo-lin;PAN Chun-rong(School of Mechanical Engineering,Jiangxi Vocational College of Mechanical&Electrical Technology,Nanchang 330013,China;School of Mechanical and Electrical Engineering,Jiangxi University of Science and Technology,Ganzhou 341000,China)
出处
《塑性工程学报》
CAS
CSCD
北大核心
2021年第4期70-76,共7页
Journal of Plasticity Engineering
基金
江西省教育厅青年科研项目(GJJ171265)。
关键词
金属薄壁管
成形极限图
液压胀形
应变路径
metal thin-walled tube
forming limit diagram
hydraulic bulging
strain path
