| 桂毓林,谭多望,孙承纬.延性金属膨胀环的运动及断裂的三维数值模拟[J].计算力学学报,2009,26(4):579~584 |
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| 延性金属膨胀环的运动及断裂的三维数值模拟 |
| 3D simulation of expanding motion and fracture of ductile metal ring |
| 投稿时间：2008-12-07 |
| DOI：10.7511/jslx20094024 |
| 中文关键词: 固体力学 延性金属环 泊松随机分布 膨胀运动与断裂 颈缩 |
| 英文关键词:lateral effect natural fragments numerical simulation PELE |
| 基金项目:中国工程物理研究院科学技术基金(20060102)资助项目. |
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| 中文摘要: |
| 利用LS-DYNA三维动力有限元软件对延性金属环的膨胀运动与断裂进行数值模拟。在膨胀环圆周加入泊松随机分布断裂成核点,利用J-C本构模型,研究诸如颈缩形成时间、颈缩区与均匀变形区的温度、应力、应变的对比等颈缩形成机理,以及讨论了环圆周上断裂成核点的泊松随机分布碎裂特性的影响。数值计算结果与实验结果、理论分析结果吻合较好,表明施加泊松随机断裂成核点的数值模拟方法是合理的。 |
| 英文摘要: |
| The expansion and fracture of ductile metal ring are simulated by LS-DYNA 3D finite element program. In the simulation, the fracture nucleation points are added as Poisson random distribution on circumference of expanding ring, the Johnson-Cook constitutive equation is chosen. The necking time, the comparison of temperature, stress and strain between necking region and non-necking region are used to analyze the necking formation mechanism. The influence of fracture nucleation point on fracture is also discussed in the paper. The good agreement with the experimental and theoretical results shows that the method of adding Poisson random distribution on circumference of expanding ring is rational. |
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