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Advances in Discrete Dislocation Dynamics Modeling of Size-Affected Plasticity

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Multiscale Materials Modeling for Nanomechanics

Part of the book series: Springer Series in Materials Science ((SSMATERIALS,volume 245))

Abstract

In dislocation-mediated plasticity of crystalline materials, discrete dislocation dynamics (DDD) methods have been widely used to predict the plastic deformation in a number of technologically important problems. These simulations have led to significant improvement in the understanding of the different mechanism that controls the mechanical properties of crystalline materials, which can greatly accelerate the future development of materials with superior properties. This chapter provides an overview of different practical applications of both two-dimensional and three-dimensional DDD simulations in the field of size-affected dislocation-mediated plasticity. The chapter is divided into two major tracks. First, DDD simulations focusing on aspects of modeling size-dependent plasticity in single crystals in uniaxial micro-compression/tension, microtorsion, microbending, and nanoindentation are discussed. Special attention is directed towards the role of cross-slip and dislocation nucleation on the overall response. Second, DDD simulations focusing on the role of interfaces, including grain and twin boundaries, on dislocation-mediated plasticity are discussed. Finally, a number of challenges that are withholding DDD simulations from reaching their full potential are discussed.

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Acknowledgements

The authors acknowledge the support by DARPA contract #N66001-12-1-4229, the Army Research Laboratory contract #W911NF-12-2-0022, and the National Science Foundation CAREER Award #CMMI-1454072. Author H.F. also acknowledges the financial support of the National Science Foundation of China (11302140) and Program for Innovative Research Team (IRT14R37).

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Authors and Affiliations

  1. Department of Mechanical Engineering, Johns Hopkins University, Baltimore, MD, 21218, USA

    Jaafar A. El-Awady & Ahmed M. Hussein

  2. Department of Mechanics, Sichuan University, Chengdu, Sichuan, 610065, China

    Haidong Fan

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  1. Jaafar A. El-Awady
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Correspondence to Jaafar A. El-Awady .

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  1. Drexel University, Philadelphia, Pennsylvania, USA

    Christopher R. Weinberger

  2. Drexel University, Philadelphia, Pennsylvania, USA

    Garritt J. Tucker

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El-Awady, J.A., Fan, H., Hussein, A.M. (2016). Advances in Discrete Dislocation Dynamics Modeling of Size-Affected Plasticity. In: Weinberger, C., Tucker, G. (eds) Multiscale Materials Modeling for Nanomechanics. Springer Series in Materials Science, vol 245. Springer, Cham. https://doi.org/10.1007/978-3-319-33480-6_11

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