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A meshless multiscale approach to modeling severe plastic deformation of metals: Application to ECAE of pure copper

Kumar, Siddhant and Tutcuoglu, Abbas D. and Hollenweger, Y. and Kochmann, D. M. (2020) A meshless multiscale approach to modeling severe plastic deformation of metals: Application to ECAE of pure copper. Computational Materials Science, 173 . Art. No. 109329. ISSN 0927-0256.

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Severe plastic deformation (SPD), occurring ubiquitously across metal forming processes, has been utilized to significantly improve bulk material properties such as the strength of metals. The latter is achieved by ultra-fine grain refinement at the polycrystalline mesoscale via the application of large plastic strains on the macroscale. We here present a multiscale framework that aims at efficiently modeling SPD processes while effectively capturing the underlying physics across all relevant scales. At the level of the macroscale boundary value problem, an enhanced maximum-entropy (max-ent) meshless method is employed. Compared to finite elements and other meshless techniques, this method offers a stabilized finite-strain updated-Lagrangian setting for improved robustness with respect to mesh distortion arising from large plastic strains. At each material point on the macroscale, we describe the polycrystalline material response via a Taylor model at the mesoscale, which captures discontinuous dynamic recrystallization through the nucleation and growth/shrinkage of grains. Each grain, in turn, is modeled by a finite-strain crystal plasticity model at the microscale. We focus on equal-channel angular extrusion (ECAE) of polycrystalline pure copper as an application, in which severe strains are generated by extruding the specimen around a 90°-corner. Our framework describes not only the evolution of strain and stress distributions during the process but also grain refinement and texture evolution, while offering a computationally feasible treatment of the macroscale mechanical boundary value problem. Though we here focus on ECAE of copper, the numerical setup is sufficiently general for other applications including SPD and thermo-mechanical processes (e.g., rolling, high-pressure torsion, etc.) as well as other materials systems.

Item Type:Article
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URLURL TypeDescription
Kumar, Siddhant0000-0003-1602-8641
Kochmann, D. M.0000-0002-9112-6615
Additional Information:© 2019 Elsevier B.V. Received 21 June 2019, Revised 29 September 2019, Accepted 30 September 2019, Available online 30 November 2019.
Funding AgencyGrant Number
Army Research Laboratory (ARL)UNSPECIFIED
Subject Keywords:Meshless method; Multiscale modeling; Recrystallization; Copper; Plasticity; Metal forming
Record Number:CaltechAUTHORS:20191202-153508281
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Official Citation:Siddhant Kumar, Abbas D. Tutcuoglu, Y. Hollenweger, D.M. Kochmann, A meshless multiscale approach to modeling severe plastic deformation of metals: Application to ECAE of pure copper, Computational Materials Science, Volume 173, 2020, 109329, ISSN 0927-0256, (
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:100151
Deposited By: Tony Diaz
Deposited On:04 Dec 2019 18:29
Last Modified:14 Jan 2020 20:57

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