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Experimental and numerical investigation of pulse-shaped split Hopkinson pressure bar test

Naghdabadi, R ; Sharif University of Technology

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  1. Type of Document: Article
  2. DOI: 10.1016/j.msea.2012.01.095
  3. Abstract:
  4. Employing a proper pulse shaper in the conventional split Hopkinson pressure bar (SHPB) test helps to achieve dynamic equilibrium condition and to fulfill a constant strain rate condition in the test specimen. To this end, the parameters affecting the incident pulse shape, i.e., pulse shaper thickness, pulse shaper diameter, striker bar length and striker bar velocity are experimentally studied. Moreover, simulation results, validated by experimental data together with wave propagation analysis, are exploited to provide general guidelines to properly design a pulse shaper. It is recommended to use a relatively large diameter pulse shaper for testing work-hardening materials. Also, for different test conditions, e.g., striker bar velocity, it is recommended to scale the pulse shaper thickness and cross-sectional area proportional to the striker bar velocity. Employing these guidelines considerably reduce the try and error process for selecting proper pulse shaper. Finally, to show the effectiveness of the proposed guidelines in practice, SHPB experiments on copper and cast iron specimens are performed. The results show that the variation of strain rate in the specimens is reduced significantly when a proper pulse shaper is employed
  5. Keywords:
  6. Dynamic equilibrium ; Split Hopkinson pressure bar ; Constant strain rate ; Cross sectional area ; Dynamic equilibria ; Error process ; Experimental data ; Incident pulse ; Large diameter ; Numerical investigations ; Pulse shaper ; Split Hopkinson Pressure Bar test ; Split Hopkinson pressure bars ; Test condition ; Test specimens ; Materials testing ; Strain rate ; Wave propagation ; Mechanical testing
  7. Source: Materials Science and Engineering A ; Volume 539 , 2012 , Pages 285-293 ; 09215093 (ISSN)
  8. URL: http://www.sciencedirect.com/science/article/pii/S0921509312001311