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Title: Effect of peak stress and tensile strain-rate on spall in tantalum

Abstract

Materials subjected to dynamic environments experience a complex and wide range of stress, strain, and strain-rate conditions. To have confidence in material models, an accurate, predictive capability is required. In this study, we present a series of flyer-plate impact tests on well characterized, high purity tantalum. The shock-waves generated at impact release from the free-surfaces, reflect, and interact to produce incipient spall fracture. By varying the flyer-plate material and impact velocity, both the peak stress and the strain-rate in the samples were controlled independently. Velocimetry was used on the rear free-surface of the samples to measure the shock-response and the spall strength. While this measurement provided the same spall strength for all cases, at approximately 5.1 GPa, when the samples were sectioned during post-mortem, the quantity and distribution of internal damage was markedly different. For the high-strain rate cases, voids remained small and isolated, whereas in the lower strain-rate experiments, the spall damage was far more localized, with a well-defined continuous spall plane. With the use of hydrocode simulations, this was discovered to result from how the different release rates affect the interaction volume inside the sample. Here, these results highlight the importance of careful sample recovery, and the risksmore » of relying solely on free-surface velocity measurements.« less

Authors:
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [1];  [1]; ORCiD logo [1]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1480043
Alternate Identifier(s):
OSTI ID: 1465907
Report Number(s):
LA-UR-18-22715
Journal ID: ISSN 0021-8979
Grant/Contract Number:  
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Journal of Applied Physics
Additional Journal Information:
Journal Volume: 124; Journal Issue: 8; Journal ID: ISSN 0021-8979
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; plate-impact; strain-rate; shock; spall; tantalum

Citation Formats

Jones, David Robert, Fensin, Saryu Jindal, Martinez, Daniel Tito, Trujillo, Carl Patrick, and Gray, III, George Thompson. Effect of peak stress and tensile strain-rate on spall in tantalum. United States: N. p., 2018. Web. doi:10.1063/1.5045045.
Jones, David Robert, Fensin, Saryu Jindal, Martinez, Daniel Tito, Trujillo, Carl Patrick, & Gray, III, George Thompson. Effect of peak stress and tensile strain-rate on spall in tantalum. United States. https://doi.org/10.1063/1.5045045
Jones, David Robert, Fensin, Saryu Jindal, Martinez, Daniel Tito, Trujillo, Carl Patrick, and Gray, III, George Thompson. 2018. "Effect of peak stress and tensile strain-rate on spall in tantalum". United States. https://doi.org/10.1063/1.5045045. https://www.osti.gov/servlets/purl/1480043.
@article{osti_1480043,
title = {Effect of peak stress and tensile strain-rate on spall in tantalum},
author = {Jones, David Robert and Fensin, Saryu Jindal and Martinez, Daniel Tito and Trujillo, Carl Patrick and Gray, III, George Thompson},
abstractNote = {Materials subjected to dynamic environments experience a complex and wide range of stress, strain, and strain-rate conditions. To have confidence in material models, an accurate, predictive capability is required. In this study, we present a series of flyer-plate impact tests on well characterized, high purity tantalum. The shock-waves generated at impact release from the free-surfaces, reflect, and interact to produce incipient spall fracture. By varying the flyer-plate material and impact velocity, both the peak stress and the strain-rate in the samples were controlled independently. Velocimetry was used on the rear free-surface of the samples to measure the shock-response and the spall strength. While this measurement provided the same spall strength for all cases, at approximately 5.1 GPa, when the samples were sectioned during post-mortem, the quantity and distribution of internal damage was markedly different. For the high-strain rate cases, voids remained small and isolated, whereas in the lower strain-rate experiments, the spall damage was far more localized, with a well-defined continuous spall plane. With the use of hydrocode simulations, this was discovered to result from how the different release rates affect the interaction volume inside the sample. Here, these results highlight the importance of careful sample recovery, and the risks of relying solely on free-surface velocity measurements.},
doi = {10.1063/1.5045045},
url = {https://www.osti.gov/biblio/1480043}, journal = {Journal of Applied Physics},
issn = {0021-8979},
number = 8,
volume = 124,
place = {United States},
year = {2018},
month = {8}
}

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Works referencing / citing this record:

Spall fracture in additive manufactured tantalum
journal, December 2018


Understanding and predicting damage and failure at grain boundaries in BCC Ta
journal, October 2019