| 韧性金属圆环高速膨胀碎裂过程的有限元模拟 |
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| 引用本文： | 陈磊,周风华,汤铁钢.韧性金属圆环高速膨胀碎裂过程的有限元模拟[J].力学学报,2011,43(5):861-870. |
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| 作者姓名： | 陈磊 周风华 汤铁钢 |
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| 作者单位： | 1. 宁波大学机械工程与力学学院;2. 中国工程物理研究院流体物理研究所; |
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| 基金项目： | 国家自然科学基金(10972108); 宁波市科技局配套项目(2006E10027); 宁波大学王宽诚幸福基金资助~~ |
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| 摘 要： | 用数值方法模拟了韧性金属圆环的自由膨胀碎裂过程. 采用Johnson-Cook
热黏塑性本构模型描述材料的动态变形和热软化特性, 采用包含内聚力失稳断裂准则的
Johnson-Cook型损伤断裂模型描述材料的破坏和分离过程, 采用结合单元消去技术的
ABAQUS/Explicit程序进行分析. 在特定膨胀速度下对多个圆环进行碎裂数值实验, 获得碎
片样本集合. 研究证实, Grady-Kipp基于塑性卸载波传播机制的韧性碎片尺寸公式可以较
好地预测碎片的平均长度. 模拟再现了圆环碎裂过程中塑性卸载波的传播,
揭示了Grady-Kipp公式合理性的物理基础.
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| 关 键 词： | 韧性金属 膨胀环实验 碎裂 碎片尺寸 Grady—Kipp公式 |
| 收稿时间： | 2010-10-11 |
| 修稿时间： | 2011-03-25 |
FINITE ELEMENT SIMULATIONS OF THE HIGH VELOCITY EXPANSION AND FRAGMENTATION OF DUCTILE METALLIC RINGS |
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| Chen Lei Zhou Fenghua Tang Tiegang.FINITE ELEMENT SIMULATIONS OF THE HIGH VELOCITY EXPANSION AND FRAGMENTATION OF DUCTILE METALLIC RINGS[J].chinese journal of theoretical and applied mechanics,2011,43(5):861-870. |
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| Authors: | Chen Lei Zhou Fenghua Tang Tiegang |
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| Institution: | 1. Department of Engineering Mechanics, Ningbo University, Ningbo 315211, China;2. Institute of Fluid Physics, China Academy of Engineering Physics,; |
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| Abstract: | In this paper,we numerically simulated the free expansion and fragmentation processes of an OFHC ring under an initial velocity.The conventional Johnson-Cook thermo-viscoplastic constitutive model was used to describe the dynamic plastic behavior of the material.The Johnson-Cook failure model incorporating a cohesive fracture criterion was used to model the separation progress of the material.ABAQUS/Explicit code with element erosion was used for the numerical simulations.Multiple simulations were conducted... |
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| Keywords: | ductile metals expanding ring tests fragmentation fragment size Grady-Kipp formula |
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