Abstract
Significant progress has been made in the in situ and postmortem observations of the dynamic tensile failure and damage evolution of a range of polymers employing Taylor anvil and Dynamic-Tensile-Extrusion (Dyn-Ten-Ext) loading. The classic Taylor anvil technique involves impacting a right-cylinder against a semi-infinite rigid anvil to access large compressive strains (>1) and high strain-rates (>1,000/s). The Dyn-Ten-Ext technique probes the tensile response of materials at large strains (>1) and high strain-rates (>1,000/s) by firing projectiles through a conical die. Depending on the extrusion ratios and velocities damage varies from bulk deformation with substantial internal damage, to a stable jet with finite particulation, to catastrophic fragmentation. Postmortem sectioning and X-ray computed tomography access mechanisms of internal damage inception and progression. In situ measurements of damage are made with the impact system for ultrafast synchrotron experiments (IMPULSE) using the advanced imaging and X-ray diffraction methods available at the Advanced Photon Source. The time resolved phase-contrast imaging elucidates the evolution of damage features during dynamic loading that is observed in post mortem sectioning and tomography.
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Acknowledgments
This work was performed at Los Alamos National Laboratory and Argonne National Laboratory’s Advanced Photon Source. C.T. Owens of LANL is gratefully acknowledged for his help in target and projectile fabrication, gun setup, and shot execution. J.A. Young and A.H. Curtis of NSTec LLC are gratefully acknowledged for PCI support. This work was supported by LANL’s Science Campaign 2 program and National Security Technologies LLC Shock Wave Physics Related Diagnostics (SWRD) program. LANL is operated by Los Alamos National Security, LLC for the U.S. Department of Energy (DOE) under Contract No. DE-AC52-06NA25396. Use of the Advanced Photon Source, an Office of Science User Facility operated for the DOE Office of Science by Argonne National Laboratory, was supported by the U.S. DOE under Contract No. DE-AC02-06CH11357.
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Brown, E.N. et al. (2015). In Situ and Postmortem Measures of Damage in Polymers at High Strain-Rates. In: Song, B., Casem, D., Kimberley, J. (eds) Dynamic Behavior of Materials, Volume 1. Conference Proceedings of the Society for Experimental Mechanics Series. Springer, Cham. https://doi.org/10.1007/978-3-319-06995-1_10
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DOI: https://doi.org/10.1007/978-3-319-06995-1_10
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