| 肖大武,李英雷,孙钊,胡时胜*.Hopkinson杆实验中弯曲杆对应力波传播的影响[J].实验力学,2008,23(3):276~280 |
| Hopkinson杆实验中弯曲杆对应力波传播的影响 |
| Stress Wave Propagation Characteristics in a Bent Hopkinson Bar |
| 投稿时间：2008-03-18 修订日期：2008-05-29 |
| DOI： |
| 中文关键词: 应力波 失真 弯曲杆 有限元 Hopkinson 杆 |
| 英文关键词:waveform distortion bent bar finite element analysis Hopkinson bar |
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| 中文摘要: |
| 应力波在弯曲杆中传播时将产生失真,这对Hopkinson杆实验的测试精度将带来不利的影响。本文通过Ls-Dyna有限元计算讨论了不同曲率半径下Hopkinson杆中应力波传播的特征,分析结果表明随弯曲程度增大，波形失真程度增大，而两对称位置的信号平均受传播距离的影响则很小。在数值计算的同时对此问题也进行了验证试验，计算与实验结果都表明，对于1m长的杆，当弯杆拱起高度不大于6mm时，波形的失真程度可以控制在1%以下，可以满足大部分Hopkinson杆实验测试精度要求，对Hopkinson杆实验具有一定的指导意义。 |
| 英文摘要: |
| Waveform is distorted when stress wave propagates in a bent bar. This distortion will degrade the measurement accuracy of Hopkinson bar experiment. In this paper, the stress wave propagation characteristics in bent bars with different curvature radius are discussed based on Ls-Dyna finite element analysis. It is found that along with the bending increase，the amplitude of distortion increases but the wave propagation distance has little effect on the average strain signal from two axisymmetric positions. Some verification experiments have been carried out. Experimental and calculational results show that the signal distortion is lower than 1% when the arch top height is less than 6mm for a 1-m long bar. This meets the test precision requirements of in most Hopkinson bar experiments. |
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