| 霍普金森撞击杆对入射波形影响的数值模拟 |
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| 作者单位： | ;1.北京科技大学土木与环境工程学院;2.云南农业大学建筑工程学院;3.中国矿业大学(北京)力学与建筑工程学院 |
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| 摘 要： | 分离式霍普金森压杆(SHPB)实验技术是研究材料在中、高应变率下力学性能的主要实验方法。大量的实验研究发现,不同的材料对入射波形的要求是不同的,因此利用霍普金森撞击杆几何参量的研究来分析撞击杆对入射波形的影响,从而根据需要设计形状不同的撞击杆。通过SHPB实验数据验证有限元模型的准确性,并将数值计算的方法应用于几何参量研究中。研究发现,撞击杆在轴向的直径变化、端面直径的大小、锥段比例等均会对入射波形产生影响,合理的撞击杆几何形状可以消除波形曲线中的P-C振荡。
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| 关 键 词： | 霍普金森压杆 入射波形 数值模拟 参量研究 |
Numerical simulation on the influence of incident wave shape by Hopkinson Striker Bar |
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| Affiliation: | ,School of Civil and Recourses Engineering, University of Science and Technology Beijing,College of Civil and Architectural Engineering, Yunnan Agricultural University,School of Mechanics & Civil Engineering, China University of Mining & Technology(Beijing) |
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| Abstract: | The split Hopkinson Pressure Bar(SHPB) experimental technique is the main experimental method to study the mechanical properties of materials under medium and high strain rates. A large number of experimental studies have found that different materials have different requirements for the incident waveform. Therefore, the study of the Hopkinson striker bar geometric parameters is used to analyze the impact of the striker bar on the incident waveform, so as to design different shapes of striker bars according to the needs. The accuracy of the finite element model is verified by SHPB experimental data, and the numerical calculation method is applied to the parameter study. The research found that the diameter change of the striker bar in the axial direction, the large diameter of the end face, and the ratio of the cone segment will all affect the incident waveform. A reasonable striker bar geometry can eliminate the P-C oscillation in the waveform curve. |
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| Keywords: | Split Hopkinson Pressure Bar incident wave shape numerical simulation parametric study |
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