Open Access

ABSTRACT

Mesoscale Modeling of Microcrystalline Ceramics

by John D. Clayton, R. Brian Leavy, Jaroslaw Knap

1 US ARL, Impact Physics Branch, Aberdeen Proving Ground, MD, 21005-5066, USA.
2 University of Maryland, A. James Clark School of Engineering, College Park, MD 20742, USA.
3 US ARL, Computational Sciences, Aberdeen Proving Ground, MD, 21005-5066, USA.
* Corresponding Author: John D. Clayton. Email: john.d.clayton1.civ@mail.mil.

The International Conference on Computational & Experimental Engineering and Sciences 2019, 21(3), 50-52. https://doi.org/10.32604/icces.2019.05118

Abstract

Diffuse interface models and simulations capture deformation and failure of polycrystalline ceramics with multiple phases. Two heterogeneous ceramic solids are investigated. The first consists of a boron carbide matrix phase embedded with titanium diboride grains. The second consists of diamond crystals with a smaller fraction of silicon carbide grains, where the latter may encapsulate the former in a micro- or nano-crystalline matrix and/or may be interspersed as larger micro-crystals. A general constitutive framework suitable for representing behaviors of all phases of each material system is reported. This framework is implemented in three-dimensional (3D) finite element (FE) simulations of polycrystalline aggregates under compressive loading. Numerical results demonstrate effects of grain and phase morphology and activation or suppression of slip or twinning mechanisms on overall strength and ductility.

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