A broad study of tantalum strength from ambient to extreme conditions

材料科学 应变率 缩放比例 机械 不稳定性 复合材料 物理 数学 几何学 冶金
作者
Michael B. Prime,A. Arsenlis,Ryan Austin,Nathan R. Barton,Corbett Chandler. Battaile,Justin Brown,L. Burakovsky,W. T. Buttler,Shuh-Rong Chen,Dana M. Dattelbaum,Saryu Fensin,Dawn G. Flicker,George T. Gray,C. W. Greeff,David R. Jones,J. Matthew D. Lane,Hojun Lim,Darby J. Luscher,Thomas R. Mattsson,J. M. McNaney,H.‐S. Park,Philip D. Powell,Shon Prisbrey,B. A. Remington,Robert E. Rudd,Sky Sjue,Damian Swift
出处
期刊:Acta Materialia [Elsevier BV]
卷期号:231: 117875-117875 被引量:29
标识
DOI:10.1016/j.actamat.2022.117875
摘要

By combining experiments and modeling from three US national laboratories, we explore compressive strength in a well-characterized material, tantalum, across pressures from zero to over 350 GPa, strain-rates from 10−3/s to 108/s and temperatures from 148 K to 3800 K. Strength values from 40+ experiments are shown to vary by nearly two orders of magnitude, from 0.15 GPa to over 10 GPa. Cross-comparison of these results allows pressure and strain-rate dependencies to be isolated, and strength increases more significantly with pressure than with strain rate over the range studied. Simulations using Preston-Tonks-Wallace, Livermore Multi-Scale, and Kink-Pair strength models test modeling capabilities and provide further insight into strength mechanics. The widely-used assumption in those models of shear-modulus scaling underpredicts strength by a factor of about two at extreme pressures in pulsed-power planar ramp-release experiments, which largely isolate pressure effects. Richtmyer-Meshkov Instability experiments, which largely isolate strain rate effects at ∼107/s, suggest that modeling assumptions about mechanisms at the highest rates need further study. Laser-driven Rayleigh-Taylor instability experiments, which simultaneously probe extreme pressures and strain rates, provide both model and cross-platform experimental validation. The large-scale collaborative nature of this study covers a wide span of experimental conditions and modeling approaches, allowing for extraordinary insight into dynamic strength.
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