| 用损伤理论方法预测铝合金薄板成型极限 |
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| 引用本文： | 樊建平,邓泽贤,崔智邦.用损伤理论方法预测铝合金薄板成型极限[J].固体力学学报,2006,27(2):109-115. |
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| 作者姓名： | 樊建平 邓泽贤 崔智邦 |
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| 作者单位： | 华中科技大学土木工程与力学学院 武汉430074(樊建平)，香港理工大学工业及系统工程学系 香港(邓泽贤，崔智邦) |
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| 摘 要： | 应用各向异性损伤理论研究2024-T3铝合金薄板的成形极限,通过构造有限元单胞模型预测薄板结构的极限应变.单胞模型由两相材料组成:铝合金基体和金属强化物.基体采用全耦合弹塑性-损伤本构方程描述,而金属强化物则视为弹脆性材料.采用所提出的缩颈准则,得到了双轴拉伸状态下铝合金薄板的极限应变,和实验结果比较两者吻合较好.研究结果揭示有限元单胞模型可以提供铝合金的细观损伤机理信息,当忽略材料的损伤影响,采用金属薄板成型理论的研究结果将过高估计薄板的极限应变.
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| 关 键 词： | 成形极限图 各向异性损伤 有限元方法 极限应变 局部缩颈 弹塑性变形 |
| 修稿时间： | 2005年6月21日 |
PREDICTION FOR FORMING LIMIT OF AL2024T3 SHEET BASED ON DAMAGE THEORY USING FINITE ELEMENT METHOD |
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| Fan Janping.PREDICTION FOR FORMING LIMIT OF AL2024T3 SHEET BASED ON DAMAGE THEORY USING FINITE ELEMENT METHOD[J].Acta Mechnica Solida Sinica,2006,27(2):109-115. |
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| Authors: | Fan Janping |
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| Abstract: | This paper presents application of anisotropic damage theory in studying the forming limit diagram of Al2024-T3 aluminum alloy sheet. In the prediction of limiting strains of the aluminum sheet structure,a finite element cell model has been constructed.The cell model consists of two phases: the aluminum alloy matrix and the intermetallic cluster.The material behavior of the aluminum alloy matrix is described by a fully coupled elasto-plastic damage constitutive equation.The intermetallic cluster is assumed to be elastic and brittle.By varying the stretching ratio,the limiting strains of the sheet under biaxial stretching have been predicted by using our proposed necking criterion.The prediction is in good agreement with the experimental findings.Moreover,the finite element cell model can provide information for understanding microscopic damage mechanism of the aluminum alloy.Over-estimation of the limit strains may be made if the effect of material damage is ignored in sheet metal forming study. |
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| Keywords: | forming limit diagram(FLD) anisotropic damage finite element method(FEM) limit strain localized necking elasto-plastic deformation |
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