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Integrated Experimental, Atomistic, and Microstructurally Based Finite Element Investigation of the Dynamic Compressive Behavior of 2139 Aluminum

Elkhodary, K. and Sun, Lipeng and Irving, Douglas L. and Brenner, Donald W. and Ravichandran, G. and Zikry, M. A. (2009) Integrated Experimental, Atomistic, and Microstructurally Based Finite Element Investigation of the Dynamic Compressive Behavior of 2139 Aluminum. Journal of Applied Mechanics, 76 (5). Art. No. 051306. ISSN 0021-8936.

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The objective of this study was to identify the microstructural mechanisms related to the high strength and ductile behavior of 2139-Al, and how dynamic conditions would affect the overall behavior of this alloy. Three interrelated approaches, which span a spectrum of spatial and temporal scales, were used: (i) The mechanical response was obtained using the split Hopkinson pressure bar, for strain-rates ranging from 1.0×10^(−3) s to 1.0×10^4 s^(−1). (ii) First principles density functional theory calculations were undertaken to characterize the structure of the interface and to better understand the role played by Ag in promoting the formation of the Ω phase for several Ω-Al interface structures. (iii) A specialized microstructurally based finite element analysis and a dislocation-density based multiple-slip formulation that accounts for an explicit crystallographic and morphological representation of Ω and Θ' precipitates and their rational orientation relations were conducted. The predictions from the microstructural finite element model indicated that the precipitates continue to harden and also act as physical barriers that impede the matrix from forming large connected zones of intense plastic strain. As the microstructural FE predictions indicated, and consistent with the experimental observations, the combined effects of Θ' and Ω, acting on different crystallographic orientations, enhance the strength and ductility, and reduce the susceptibility of 2139-Al to shear strain localization due to dynamic compressive loads.

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Additional Information:© 2009 American Society of Mechanical Engineers. Contributed by the Applied Mechanics Division of ASME for publication in the JOURNAL OF APPLIED MECHANISM. Manuscript received June 5, 2008; final manuscript received December 29, 2008; published online June 15, 2009. Review conducted by Ashkan Vaziri. Support from the U.S. Army Research Office (Grant No. ARO W911 NF-06–1–0472) is gratefully acknowledged.
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Army Research Office (ARO)W911 NF-06–1–0472
Subject Keywords:aluminium alloys; compressive strength; crystal microstructure; crystal morphology; crystal orientation; density functional theory; dislocation density; finite element analysis; interface structure; plastic deformation
Record Number:CaltechAUTHORS:20090821-143416228
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15247
Deposited By: Jason Perez
Deposited On:24 Aug 2009 15:50
Last Modified:31 Mar 2017 18:42

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