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A quartz-crystal-embedded split Hopkinson pressure bar for soft materials
Authors:W Chen  F Lu  B Zhou
Institution:(1) Department of Aerospace and Mechanical Engineering, University of Arizona, 85721 Tucson, AZ
Abstract:A dynamic experimental technique that is three orders of magnitude as sensitive in stress measurement as a conventional split Hopkinson pressure bar (SHPB) has been developed. Experimental results show that this new method is effective and reliable for determining the dynamic compressive stress-strain responses of materials with low mechanical impedance and low compressive strengths, such as elastomeric materials and foams at high strain rates. The technique is based on a conventional SHPB. Instead of a surface strain gage mounted on the transmission bar, a piezoelectric force transducer was embedded in the middle of the transmission bar of a high-strength aluminum alloy to directly measure the weakly transmitted force profile from a soft specimen. In addition, a pulse-shape technique was used for increasing the rise time of the incident pulse to ensure stress equilibrium and homogeneous deformation in the low-impedance and low-strength specimen.
Keywords:Soft materials  Hopkinson bar  quartz crystal  dynamic behavior  high strain rate
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