| 高温下轻质泡沫铝动态力学性能实验 |
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| 引用本文： | 王鹏飞, 徐松林, 李志斌, 胡时胜. 高温下轻质泡沫铝动态力学性能实验[J]. 爆炸与冲击, 2014, 34(4): 433-438. doi: 10.11883/1001-1455(2014)04-0433-06 |
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| 作者姓名： | 王鹏飞 徐松林 李志斌 胡时胜 |
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| 作者单位： | 中国科学技术大学中国科学院材料力学行为和设计重点实验室，安徽 合肥 230027 |
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| 基金项目： | 国家自然科学基金项目(90916026)~~ |
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| 摘 要： | 对传统的分离式Hopkinson压杆装置加以改进，设计了一种长杆直接撞击Hopkinson杆的实验方案，检测出低波阻抗材料在高温动态加载下的应力均匀性。对轻质泡沫铝材料的实验表明，在同一撞击速度下，温度越高，试件两端的应力均匀性越差，增加温度与提高撞击速度均会导致泡沫铝材料冲击端与支撑端的应力不均匀性。根据高温下应力均匀性的实验结果，确定高温下试件均匀变形对应的冲击速度，再通过传统的分离式Hopkinson压杆实验得出泡沫铝在高温动态下的力学性能。
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| 关 键 词： | 固体力学 应力均匀 Hopkinson杆 轻质泡沫铝 高温 动态 |
| 收稿时间： | 2012-12-10 |
| 修稿时间： | 2013-04-12 |
An experimental study on dynamic mechanical property ofultra-light aluminum foam under high temperatures |
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| Peng-fei Wang, Song-lin Xu, Zhi-bin Li, Shi-sheng Hu. An experimental study on dynamic mechanical property ofultra-light aluminum foam under high temperatures[J]. Explosion And Shock Waves, 2014, 34(4): 433-438. doi: 10.11883/1001-1455(2014)04-0433-06 |
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| Authors: | Peng-fei Wang Song-lin Xu Zhi-bin Li Shi-sheng Hu |
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| Affiliation: | CAS Key Laboratory of Mechanical Behavior and Design of Materials, University of Science and Technology of China, Hefei 230027, Anhui, China |
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| Abstract: | An improved split Hopkinson pressure bar device was applied and a direct impact Hopkinson experimental program with long bullets was designed to measure the dynamic properties of closed-cell aluminum foam under high temperatures. Stress-time curves of both ends of aluminum foam specimens were obtained. It is found that the temperature markedly influence the stress uniformity of the specimens. As the temperature increases, the stress non-uniformity in the specimen becomes serious under the same impact velocity. Thus, both the increment in the test temperature and the impact velocity will cause stress non-uniformity of aluminum foam specimens. For aluminum foams, homogeneous deformation mode is dominant when the impact velocity is low, and the meso-scopic deformation pattern may vary but the stress field of the foam specimen is macroscopically homogeneous. Finally, the SHPB experiment is used to obtain the stress-strain curve under high temperature and high strain rate, after ensuring homogeneous deformation of the specimen. |
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| Keywords: | solid mechanics stress uniformity Hopkinson bar ultra-light aluminum foam high temperature dynamic |
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