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Strength of magnesium at high pressures and strain rates

Ravindran, Suraj and Lovinger, Zev and Gandhi, Vatsa and Mello, Michael and Ravichandran, Guruswami (2020) Strength of magnesium at high pressures and strain rates. Extreme Mechanics Letters, 41 . Art. No. 101044. ISSN 2352-4316. https://resolver.caltech.edu/CaltechAUTHORS:20201016-131847434

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Abstract

The strength and deformation mechanisms in magnesium can be significantly affected by anisotropy, high strain rates, and pressure. In this study, pressure shear plate impact (PSPI) experiments are conducted to measure the strength of extruded polycrystalline magnesium at pressures varying from 5 to 10 GPa at a nominal strain rate of 10⁵ s⁻¹. The experimental technique enables to first shock load the material sample to the desired normal stress in one direction, and then shear the material in a perpendicular direction. A recently developed hybrid analysis method for PSPI experiments is used to extract the stress–strain curves of magnesium from the particle velocity records measured at the rear surface of the target. The PSPI experimental results reveal a slower twinning saturation at high pressures. To better understand the material behavior under the combined stress states in the PSPI experiments, the results were compared with that of a specimen deformed by a two-step process of quasi-static compression followed by dynamic shear loading at relatively low pressure. The two-stage loading at low pressure, and the calculation of temperature rise in the PSPI experiment revealed that the combined effect of the reorientation and the temperature rise lower the flow strength of magnesium at high pressures under multiaxial loading.


Item Type:Article
Related URLs:
URLURL TypeDescription
https://doi.org/10.1016/j.eml.2020.101044DOIArticle
ORCID:
AuthorORCID
Ravindran, Suraj0000-0003-2930-7906
Lovinger, Zev0000-0002-9313-9495
Mello, Michael0000-0003-2129-9235
Ravichandran, Guruswami0000-0002-2912-0001
Additional Information:© 2020 Elsevier. Received 15 May 2020, Revised 2 August 2020, Accepted 26 September 2020, Available online 16 October 2020. Part of Special Issue in Honor of Horacio D. Espinosa, recipient of the 2019 Prager Medal. The research was sponsored by the Army Research Laboratory, United States 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. We also want to thank Dr. Christian Kettenbeil for the discussions and help in making the diffraction gratings on the anvil plates. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
Group:GALCIT
Funders:
Funding AgencyGrant Number
Army Research Laboratory (ARO)W911NF-12-2-0022
Subject Keywords:Magnesium; Pressure-shear; Dynamic strength; High strain rate
Record Number:CaltechAUTHORS:20201016-131847434
Persistent URL:https://resolver.caltech.edu/CaltechAUTHORS:20201016-131847434
Official Citation:Suraj Ravindran, Zev Lovinger, Vatsa Gandhi, Michael Mello, Guruswami Ravichandran, Strength of magnesium at high pressures and strain rates, Extreme Mechanics Letters, Volume 41, 2020, 101044, ISSN 2352-4316, https://doi.org/10.1016/j.eml.2020.101044. (http://www.sciencedirect.com/science/article/pii/S2352431620302480)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:106113
Collection:CaltechAUTHORS
Deposited By: George Porter
Deposited On:16 Oct 2020 21:33
Last Modified:29 Oct 2020 16:26

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