A quartz-crystal-embedded split Hopkinson pressure bar for soft materials |
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Authors: | W Chen F Lu B Zhou |
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Institution: | (1) Department of Aerospace and Mechanical Engineering, University of Arizona, 85721 Tucson, AZ |
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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. |
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Keywords: | Soft materials Hopkinson bar quartz crystal dynamic behavior high strain rate |
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