Abstract
We describe a laser-launched micro-flyer apparatus designed for spall strength measurement. The launcher uses a single pulse from a pulsed laser that is stretched in time to nominally 20 nanoseconds using an optical ring cavity, while inexpensive multi-lens arrays are used to spatially homogenize the beam. The velocimetry technique that we developed for the experiment provides the required sub-nanosecond time resolution. We demonstrate the capability of the apparatus to interrogate the spall strength of AZ31B Mg alloy thin foils, a material system with potential applications as a lightweight protection material. Numerical simulations and fractography are very useful to determine the quality of the experimental data and help to interpret our results. The simulations and fractography analyses of the experiments suggest that the short shock pulse duration in the experiment causes incipient spallation. The short pulse also likely introduces stochasticity to the measured spall strength through limited activation of failure mechanisms within the samples. The shocked AZ31B Mg alloy has spall strengths that are greater than previously reported figures for fine grained Mg alloys, likely because the laser based system achieves higher strain rates than in prior work on this material.
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Acknowledgements
We thank the Dlott group at University of Illinois Urbana Champagne for their guidance in developing the apparatus based on their experiences pioneering their facility. We also thank Dr. Joseph Zaug for his mentorship of D.D.M. and general assistance with facility development. We thank Dr. Jeff Lloyd and Dr. Rich Becker for providing thought provoking conversations while analyzing these results and for assistance with the simulations. Finally, we thank the Hopkins Extreme Materials Institute for their support, specifically Dr. Amy Dagro, Matt Shaeffer, Dr. Andrew Leong, Hao Sheng, Steve Lavenstein, Dr. David Eastman and Dr. Ravi Shivaraman. This research was sponsored by the Army Research Laboratory and was accomplished under Cooperative Agreement Number W911NF-12-2-0022. The views and conclusions contained in this document are those of the authors and should not be interpreted as representing the official policies, either expressed or implied, of the Army Research Laboratory or the U.S. Government. The U.S. Government is authorized to reproduce and distribute reprints for Government purposes notwithstanding any copyright notation herein.
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Mallick, D.D., Zhao, M., Parker, J. et al. Laser-Driven Flyers and Nanosecond-Resolved Velocimetry for Spall Studies in Thin Metal Foils. Exp Mech 59, 611–628 (2019). https://doi.org/10.1007/s11340-019-00519-x
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DOI: https://doi.org/10.1007/s11340-019-00519-x