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A Novel Approach for Plate Impact Experiments to Determine the Dynamic Behavior of Materials Under Extreme Conditions

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Abstract

This paper presents a unique approach to plate impact experiments for characterization of dynamic material behavior under extreme conditions, i.e., ultra-high strain-rates (~106/s) and test temperatures up to 1000 °C. Strategic modifications are made to the existing single-stage gas-gun facility at CWRU to enable this approach. These include an extension of the gun barrel at the breech end of the gas-gun, which now incorporates a precision machined steel housing that carries a vertical heater well to accommodate an 800 W resistance coil heater with axial and rotational degrees of freedom. This custom designed heater assembly enables specimens placed on the flyer plate carried by the sabot to be heated uniformly across the diameter in a 100 mTorr vacuum prior to impact at the breech end of the gun barrel. A new sabot design is utilized to minimize heat transfer from the heated flyer plate to the sabot body. Using this modified gas-gun facility, the dynamic strength of pre-heated commercial purity polycrystalline aluminum samples is investigated at the onset of plastic flow in response to weak normal shock compression at test temperatures ranging from room to near melt point of aluminum. The dynamic strength of aluminum samples, as inferred from the measured normal particle velocity history at the free (rear) surface of the target plate, show progressive weakening with increasing specimen temperatures in the temperature range 23–643 °C; at higher test temperatures, however, the rate of softening in dynamic strength is observed to weaken and even reverse as the sample temperatures approach the melt point of aluminum (test temperature ~643 °C).

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Acknowledgements

The authors would like to acknowledge the financial support of the U.S. Department of Energy through the Stewardship Science Academic Alliance (DE-NA0001989 and DE-NA0002919) in conducting the present research.

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Authors and Affiliations

  1. Department of Mechanical and Aerospace Engineering, Case Western Reserve University, Cleveland, OH, 441067222, USA

    Bryan Zuanetti, Tianxue Wang & Vikas Prakash

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  1. Bryan Zuanetti
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  2. Tianxue Wang
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  3. Vikas Prakash
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Correspondence to Vikas Prakash.

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Zuanetti, B., Wang, T. & Prakash, V. A Novel Approach for Plate Impact Experiments to Determine the Dynamic Behavior of Materials Under Extreme Conditions. J. dynamic behavior mater. 3, 64–75 (2017). https://doi.org/10.1007/s40870-017-0095-5

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  • DOI: https://doi.org/10.1007/s40870-017-0095-5

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