| 确定材料在高温高应变率下动态性能的 Hopkinson杆系统 |
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| 引用本文： | 李玉龙,索涛,郭伟国,胡锐,李金山,傅恒志.确定材料在高温高应变率下动态性能的 Hopkinson杆系统[J].爆炸与冲击,2005,25(6):487-492. |
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| 作者姓名： | 李玉龙 索涛 郭伟国 胡锐 李金山 傅恒志 |
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| 作者单位： | 西北工业大学航空学院,陕西,西安,710072;西北工业大学材料学院,陕西,西安,710072 |
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| 基金项目： | 国家自然科学基金委员会-中国工程物理研究院联合资助项目
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西北工业大学校科研和教改项目 |
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| 摘 要： | 描述了一种利用Hopkinson杆装置确定在高温（温度可高达1 173 K）、高应变率下材料动态性能的试验方法。在试样加温过程中，试样不与入射杆及透射杆接触。当试样加热到预定温度时，气压驱动同步组装系统，推动透射杆及试样，使得应力波到达入射杆与试样接触面时，入射杆、试样及透射杆紧密接触。利用以上系统，完成了连铸单晶铜及上引法连铸多晶铜从室温到1 085 K范围内的应力应变曲线。测试结果表明，不论是上引法连铸多晶铜还是连铸单晶铜，流动应力随温度的升高而下降，在温度低于585 K时，材料的应变硬化率明显大于在温度高于585 K时的应变硬化率。
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| 关 键 词： | 固体力学 流动应力 Hopkinson杆 高温 高应变率 应变硬化 |
| 文章编号： | 1001-1455(2005)06-0487-06 |
| 收稿时间： | 11 23 2004 12:00AM |
| 修稿时间： | 03 14 2005 12:00AM |
Determination of dynamic behavior of materials at elevated temperatures and high strain rates using Hopkinson bar |
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| LI Yu-long,SUO Tao,GUO Wei-guo,HU Rui,LI Jin-shan,FU Heng-zhi.Determination of dynamic behavior of materials at elevated temperatures and high strain rates using Hopkinson bar[J].Explosion and Shock Waves,2005,25(6):487-492. |
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| Authors: | LI Yu-long SUO Tao GUO Wei-guo HU Rui LI Jin-shan FU Heng-zhi |
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| Affiliation: | 1.School of Aeronautics, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China;2.School of Materials Science and Engineering, Northwestern Polytechnical University, Xi’an 710072, Shaanxi, China |
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| Abstract: | The Hopkinson bar technique with a furnace and a driving mechanism is utilized tO aetermine the dynamic property of materials at elevated temperature and high strain rates. The specimen is heated by a furnace independently. While the temperature in specimen reaches the desired temperature, a driving mechanism shifts the transmission bar and the specimen to contact the incident bar, so that the transmission bar, the specimen and incident bar fully contact each other just before the stress wave reaches the interface between incident bar and specimen. The dynamic properties of single crystal copper and polycrystal copper at the temperature range from room temperature to 1 085 K are tested. The results show that the flow stress of both materials decreases with increase of temperature, and strain hardening rates at a temperature below 585 K are greater than that at the temperature above 585 K. |
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| Keywords: | solid mechanics flow stress Hopkinson bar high temperature high strain rate strain hardening |
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