Effects of imperfect experimental conditions on stress waves in SHPB experiments

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• 作者：Xianqian Wu ; Qiuyun Yin ; Yanpeng Wei ; Chenguang Huang
• 关键词：Imperfect experimental conditions ; SHPB experiments ; Stress waves ; PDV measurement ; Numerical simulation
• 刊名：Acta Mechanica Solida Sinica
• 出版年：2015
• 出版时间：December 2015
• 年：2015
• 卷：31
• 期：6
• 页码：827-836
• 全文大小：1,124 KB
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• 作者单位：Xianqian Wu (1)
  Qiuyun Yin (1)
  Yanpeng Wei (1)
  Chenguang Huang (1)
  
  1. Key Laboratory of Mechanics in Fluid Solid Coupling Systems, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China
  
• 刊物类别：Engineering
• 刊物主题：Theoretical and Applied Mechanics
  Mechanics, Fluids and Thermodynamics
  Engineering Fluid Dynamics
  Numerical and Computational Methods in Engineering
  Chinese Library of Science
  
• 出版者：The Chinese Society of Theoretical and Applied Mechanics; Institute of Mechanics, Chinese Academy of
• ISSN：1614-3116

文摘

Experimental and numerical simulations were undertaken to estimate the effects of imperfect conditions on stress waves in split Hopkinson pressure bar (SHPB) experiments. The photonic Doppler velocimetry (PDV) measurement results show that the rise and fall times of an incident wave increases with an increasing inclination angle; also, the fluctuations of the incident wave disappear gradually with the increase of inclination angle. The following characteristics for various defects in the SHPB were obtained by numerical simulation: (1) the influence of a curved bar was negligible; (2) misalignment modestly affects the fluctuation characteristics, and bending waves were generated at this condition; (3) inclination and indentation of the impact end-surface had a great impact on the incident waves, and both of them increase the rise time of the incident wave by increasing the degree of defects. In view of the results, misalignment, inclination, and indentation in SHPB experiments should be minimized. Keywords Imperfect experimental conditions SHPB experiments Stress waves PDV measurement Numerical simulation