| 晶粒度对纯铝动态力学性能的影响 |
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| 引用本文： | 兰胜威,曾新吾. 晶粒度对纯铝动态力学性能的影响[J]. 爆炸与冲击, 2008, 28(5): 462-466. DOI: 10.11883/1001-1455(2008)05-0462-05 |
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| 作者姓名： | 兰胜威 曾新吾 |
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| 作者单位： | 国防科学技术大学光电科学与工程学院,湖南,长沙,410073;中国空气动力学研究与发展中心超高速空气动力研究所,四川,绵阳,622663;国防科学技术大学光电科学与工程学院,湖南,长沙,410073 |
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| 基金项目： | 冲击波物理与爆轰物理国防重点实验室基金 |
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| 摘 要： | 通过热处理方式制备了3种不同晶粒度的纯铝样品。利用分离式霍普金森压杆加载装置测量了3种纯铝在应变率102～104 s-1范围内的应力应变曲线。实验曲线表明,纯铝的屈服应力和流动应力随晶粒度的增大而减小；根据实验数据拟合了纯铝在动态下的Hall-Petch公式。同时采用一级轻气炮对3种纯铝进行了层裂实验，结果表明晶粒度对纯铝的层裂特性几乎没有影响。
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| 关 键 词： | 固体力学 动态力学性能 分离式霍普金森压杆 纯铝 晶粒度 应变率 层裂 |
Effect of grain size on dynamic mechanical properties of pure aluminum |
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| LAN Sheng-wei,ZENG Xin-wu. Effect of grain size on dynamic mechanical properties of pure aluminum[J]. Explosion and Shock Waves, 2008, 28(5): 462-466. DOI: 10.11883/1001-1455(2008)05-0462-05 |
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| Authors: | LAN Sheng-wei ZENG Xin-wu |
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| Affiliation: | 1.Institute of Optoelectronic Science and Technology, National University of Defense Technology, Changsha 410073, Hunan, China;2.Hypervelocity Aerodynamics Institute, China Aerodynamic Research and Development Center, Mianyang 622663, Sichuan, China |
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| Abstract: | Three pure aluminum specimens with different grain sizes were obtained by the controlled heat treatment process. The stress-strain curves of the three pure aluminum specimens at 102~104 s-1 were obtained by using the split Hopkinson pressure bar technique. The yield stress and flow stress increase with the decrease of the grain size. A Hall-Petch relationship of pure aluminum under dynamic loadings was fitted out. Spall tests were performed for the three specimens by utilizing a one-stage gas gun. The results show that the grain size can hardly influence the spall properties of pure aluminum. |
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| Keywords: | solid mechanics dynamic mechanical properties split Hopkinson pressure bar pure aluminum grain size strain rate spall |
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