| 非线性路径下板料拉深成形过程中破裂预测 |
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| 引用本文： | 黄建科,董湘怀.非线性路径下板料拉深成形过程中破裂预测[J].精密成形工程,2009,1(1):53-56. |
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| 作者姓名： | 黄建科 董湘怀 |
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| 作者单位： | 上海交通大学,模具CAD国家工程研究中心,上海,200030 |
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| 基金项目： | 国家自然科学基金，高等学校博士学科点专项科研基金 |
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| 摘 要： | 在优选模型参数和简化孔洞形核规律的基础上,采用Gurson-Tvergaard (GT) 多孔材料本构模型分析圆筒件拉深过程;根据金属成形工艺特点,综合考虑拉伸型和剪切型2种不同韧性断裂机制,提出一个统一的韧性断裂准则形式.对于未经过预变形和经过预变形的圆筒件拉深试验和数值模拟进行了比较,结果表明:相对于成形极限图,新的韧性断裂准则可以更加准确地预测非线性路径下圆筒件的拉深破裂.
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| 关 键 词： | 金属成形 韧性断裂 孔洞形核 拉深 |
| 收稿时间： | 2009/4/27 0:00:00 |
| 修稿时间： | 2009/7/10 0:00:00 |
Prediction of Ductile Fracture in Deep Drawing of Sheet Metal with Nonlinear Strain Path |
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| HUANG Jian-ke and DONG Xiang-huai.Prediction of Ductile Fracture in Deep Drawing of Sheet Metal with Nonlinear Strain Path[J].Journal of Netshape Forming Engineering,2009,1(1):53-56. |
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| Authors: | HUANG Jian-ke and DONG Xiang-huai |
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| Affiliation: | National Die & Mould CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China and National Die & Mould CAD Engineering Research Center, Shanghai Jiaotong University, Shanghai 200030, China |
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| Abstract: | Gurson-Tvergaard (GT) porous material model with optimized parameters and a practical void nucleation law is adopted to analyze deep drawing of cylindric parts. A unified fracture criterion, considering both tension-type mode and shear-type mode, is proposed and applied in the analysis. The comparison of experimental and numerical results of deep drawing using non-prestrained and prestrained blank confirms that our ductile fracture criterion (DFC) more accurately predicts the ductile fracture in the deep drawing process with nonlinear strain path compared with forming limit diagram (FLD). |
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| Keywords: | ductile fracture metalforming processes void nucleation deep drawing |
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