| 高加载率条件下LY12铝合金损伤断裂现象的研究 |
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| 引用本文： | 王泽平,黄风雷.高加载率条件下LY12铝合金损伤断裂现象的研究[J].高压物理学报,1993,7(1):23-32. |
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| 作者姓名： | 王泽平 黄风雷 |
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| 作者单位： | 西南交通大学应用力学研究所，北京理工大学力学工程系，北京理工大学力学工程系，中国工程物理研究院流体物理研究所 成都 610031，北京 100081，北京 100081，成都 610003 |
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| 基金项目： | 高等学校博士学科点专项基金 |
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| 摘 要： | 本文以球形实体中含有一球形空穴为基本单元，通过分析单元的受力状态，推导出了一个韧性介质空穴增长模型。模型中考虑了介质的硬化，应变率效应，同时还考虑了惯性效应。在考虑空穴成核效应时，采用了热激活成核机制。对LY12铝合金进行了二维层裂实验，采用本文提出的动态损伤模型，借助于二维Lagrange弹塑性流动有限差分程序对二维层裂实验进行了数值模拟，计算结果与实验吻合较好。
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| 关 键 词： | 二维层裂 数值模拟 韧性介质动态损伤 空穴成核成长 |
| 收稿时间： | 1992-04-13; |
STUDIES OF DYNAMIC DAMAGE BEHAVIOR IN LY12 ALUMINUM ALLOY UNDER THE CONDITION OF HIGH LOADING RATE |
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| Wang Zeping.STUDIES OF DYNAMIC DAMAGE BEHAVIOR IN LY12 ALUMINUM ALLOY UNDER THE CONDITION OF HIGH LOADING RATE[J].Chinese Journal of High Pressure Physics,1993,7(1):23-32. |
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| Authors: | Wang Zeping |
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| Affiliation: | 1. Institute of Applied Mechanics, Southwest Jiaotong University, Chengdu 610031, China;2. Beijing Institute of Technology, Beijing 100081, China;3. Southwest Institute of Fluid Physics, Chengdu 610003, China |
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| Abstract: | A new ductile dynamic failure model, based on a porous element consisting of a single spherical void of radius a in a sphere of radius b subjected to internal pressure pg and external stress σr=-αp+(α-1)pg is developed in this paper. Work-hardening, rate-dependent contribution and inertial effects are considered in the model. Stress controlling mechanism is adopted while considering the contribution of void nucleation to rate of porosity Φ. The mathematical model presented here is incorporated in a hydrodynamic two dimensional finite-difference computer code, to simulate two dimensional spallation of LY12 aluminum alloy. Comparison of numerical calculation with experimental results shows that the model described the process of spall experiment successfully. The future improvement of the model is discussed. |
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| Keywords: | two dimensional spallation numerical simulation dynamic fracture of ductile material nucleation and growth of void |
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