High strain-rate modeling of the interfacial effects of dispersed particles in high strength aluminum alloys

INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES

卷:49

Article

Lee, W. M.¹  Zikry, M. A.¹ 

[1] N Carolina State Univ, Dept Mech & Aerosp Engn, Raleigh, NC 27695 USA

关键词: Dispersoid;    Aluminum alloy;    High strain-rate;    Orowan looping;    Finite element method;   

DOI  :  10.1016/j.ijsolstr.2012.07.003

来源: Elsevier

【 摘 要 】

The interfacial effects of dispersed particles on the dynamic deformation of high strength aluminum alloys have been investigated using an eigenstrain-based formulation coupled with dislocation-density based crystalline plasticity and a microstructurally based finite element framework. This accounts for the unrelaxed plastic strains associated with the interfacial behavior of dispersed particles, such as Orowan looping. Particle spacing had a significant effect on the distribution of plastic shear slip, with localization occurring between the particles for smaller particle spacing. The eigenstress field associated with larger particles led to longer-range interaction of pressure fields, which can promote void coalescence for nucleated voids at the particle-matrix interface. Grain orientation also had a significant effect on the behavior associated with the particles, with plastic shear slip localizing at the particle-matrix interfaces for low angle grain-boundary (GB) misorientations, and at CBs and GB junctions for high angle GB misorientations. (C) 2012 Elsevier Ltd. All rights reserved.

【 授权许可】

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