T型三通管液压成形的塑性损伤(英文)

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Bibliographic Details
Published in中国有色金属学会会刊：英文版 no. S2; pp. 294 - 301
Main Author 滕步刚 苑世剑 陈增涛 金学润
Format Journal Article
LanguageEnglish
Published 2012
Subjects
GTN模型
T型三通
内压
孔洞体积分数
损伤
液压成形
破裂
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Bibliography:T-shape;hydroforming;GTN model;damage;bursting fracture;porosity;internal pressure
TENG Bu-gang1,2, YUAN Shi-jian1,2, CHEN Zeng-tao3, JIN Xue-run4 1. National Key Laboratory for Precision Hot Processing of Metals, Harbin Institute of Technology, Harbin 150001, China; 2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China; 3. Department of Mechanical Engineering, University of New Brunswick, Fredericton, NB E3B 5A3, Canada; 4. FAW Car Co., Ltd., Changchun 130011, China
43-1239/TG
采用GTN损伤模型,分析了不锈钢T型三通管的破裂行为,采用数值模拟和管件液压胀形试验确定了GTN模型中临界孔洞体积分数和极限孔洞体积分数,分析了成形压力及轴向补料量对损伤演变的影响,分析了应力三轴度及塑性应变对孔洞体积分数的影响规律。结果表明:成形压力较高或轴向补料量较小时,管件成形过程中将产生破裂缺陷。支管顶部处于双向拉应力状态,主管侧壁处于环向拉伸、轴向压缩的应力状态。在成形初始阶段,内压较低时,塑性应变孔洞体积分数变化的影响较大;然而,在成形后期,内压较高时,应力三轴度对孔洞体积分数的增大有较大影响。数值模拟及试验结果给出了相同的壁厚分布规律,所成形三通管的最大壁厚减薄率为36%左右
ISSN:1003-6326