| SHPB测试中的均匀性问题及恒应变率 |
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| 引用本文： | 宋力,胡时胜.SHPB测试中的均匀性问题及恒应变率[J].爆炸与冲击,2005,25(3):207-216. |
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| 作者姓名： | 宋力 胡时胜 |
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| 作者单位： | 1.中国科技大学力学与机械工程系，安徽 合肥 230026 |
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| 摘 要： | 利用一维应力波理论对霍普金森压杆(SHPB)测试中的均匀性问题作了较为详尽的讨论，对测试中各种加载波形的优缺点及各参数对均匀性的影响进行了分析与评估。给出了测试脆性材料时实现恒应变率加载的加载条件。对在满足应力均匀性要求下SHPB的可测应变率范围作了讨论并修正了前人不完善的结论。讨论了考虑均匀性时应采用的测试数据处理方法。利用图解的方法对弹塑性材料测试时的均匀性问题及相应加载要求作了定性分析，指出对弹塑性材料，测试中的应变不均匀也应予以考虑。
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| 关 键 词： | 固体力学 应力均匀性 一维应力波理论 SHPB 恒应变率 |
| 文章编号： | 1001-1455(2005)03-0207-10 |
| 修稿时间： | 2004年5月10日 |
Stress uniformity and constant strain rate in SHPB test |
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| SONG Li,HU Shi-sheng.Stress uniformity and constant strain rate in SHPB test[J].Explosion and Shock Waves,2005,25(3):207-216. |
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| Authors: | SONG Li HU Shi-sheng |
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| Institution: | 1.Department of Mechanics and Mechanical Engineering, University of Science and Technology of China, Hefei 230026, Anhui, China |
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| Abstract: | The stress uniformity in split Hopkinson pressure bar (SHPB) test is analyzed in detail by using one-dimensional stress wave theory. The influence of related experimental parameters is evalua- ted. The advantages and disadvantages of some typical loading waveform are discussed. For brittle material testing, the governing equation of input waveform for attaining constant strain-rate loading is given. The strain-rate limitation of SHPB test under certain stress equilibrium condition is analyzed and some new conclusion is given. The method for experimental data analysis of SHPB for better ac- curacy is also discussed. A qualitative analysis of uniformity and the wanted loading waveform have been done for testing elastic-plastic material made by diagrammatic method. The result indicates that for elastic-plastic material, the strain uniformity should be considered. |
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| Keywords: | solid mechanics strees uniformity one-dimensional stress wave theory SHPB constant strain-rate |
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