@inproceedings{a1a0a8e955a74594b8408ed3741a3680,
title = "Methodology for determining spall damage mode preference in shocked FCC Polycrystalline metals from 3D X-ray tomography data",
abstract = "Three-dimensional X-ray tomography (XRT) provides a non-destructive technique to determine the location, size, and shape of spall damage within shock loaded metals. Polycrystalline copper samples of varying thermomechanical histories were shocked via plate impacts at low pressures to ensure incipient spall conditions. Additionally, samples of similar heat-treated microstructures were impacted at various loading rates. All 3D XRT volumetric void data underwent smoothing, thresholding, and volumetric sieves. The full inertia tensor was found for each void, which was used to create best fit ellipsoids correlating shape to damage modes. Density distributions were plotted for the best-fit ellipsoid semi-axes aspect ratios a/c and b/c, where, a≤b≤c. It was found that >60% of voids in heat-treated samples resembled transgranular damage, whereas >70% of voids in the rolled sample resembled intergranular damage. Preliminary analysis also clearly indicates an increase of void coalescence with decreasing tensile loading stress rates for impacted samples of similar microstructures.",
keywords = "Copper, Microstructure, Shock loading, Spall, X-ray tomography",
author = "Brown, {A. D.} and Q. Pham and Pedro Peralta and Patterson, {B. M.} and Escobedo-Diaz, {J. P.} and Luo, {S. N.} and D. Dennis-Koller and Cerreta, {E. K.} and D. Byler and A. Koskelo and X. Xiao",
note = "Funding Information: This research work was funded by LANL under LDRD # 20060021DR, LDRD-DR # 20100026 and by the Department of Energy, NNSA, under SSAA Grants #DE-FG52-06NA26169, DE-FG52-10NA29653, and DE-NA0002005 and APS General User Proposal 35561. Los Alamos National Laboratory is operated by LANS, LLC, for the NNSA of the US Department of Energy under contract DE-AC52-06NA25396. Eric Loomis, Pat Dickerson (LANL), Damian Swift (LLNL), David Wright, and Dallas Kingsbury (ASU) are thanked for their help during the various phases of the research work. Access to the TRIDENT Facility & Electron Microscopy Laboratory at LANL, Pavel Shevchenko at APS 2-BM, as well as the Center for High Resolution Electron Microscopy and the Mechanical Testing Laboratory at ASU is gratefully acknowledged.; Characterization of Minerals, Metals, and Materials 2016 - TMS 2016: 145th Annual Meeting and Exhibition ; Conference date: 14-02-2016 Through 18-02-2016",
year = "2016",
language = "English (US)",
series = "TMS Annual Meeting",
publisher = "Minerals, Metals and Materials Society",
number = "CONFCODENUMBER",
pages = "57--64",
editor = "Ikhmayies, {Shadia Jamil} and Ikhmayies, {Shadia Jamil} and Bowen Li and Carpenter, {John S.} and Carpenter, {John S.} and Jiann-Yang Hwang and Jiann-Yang Hwang and Monteiro, {Sergio Neves} and Jian Li and Donato Firrao and Donato Firrao and Donato Firrao and Donato Firrao and Mingming Zhang and Zhiwei Peng and Zhiwei Peng and Zhiwei Peng and Escobedo-Diaz, {Juan Pablo} and Escobedo-Diaz, {Juan Pablo} and Chenguang Bai",
booktitle = "TMS Annual Meeting",
edition = "CONFCODENUMBER",
}