Accession Number ADA581084
Title Computational Investigation of Structured Shocks in Al/SiC-Particulate Metal-Matrix Composites.
Publication Date Jun 2011
Media Count 33p
Personal Author B. Pandurangan B. A. Cheeseman C. Yen M. Grujicic W. C. Bell
Abstract Propagation of planar (i.e. one directional), longitudinal (i.e. uniaxial strain), steady (i.e. time-invariant) structured shock waves within metal matrix composites (MMCs) is studied computationally. Waves of this type are typically generated during blast-wave loading or ballistic impact and play a major role in the way blast/ballistic impact loads are introduced in, and applied to, a target structure. Hence, the knowledge of the basic physics of propagation of these waves is critical for designing structures with superior blast and impact protection capabilities. The purpose of this paper is to help advance the use of computational engineering analyses and simulations in the areas of design and application of the MMC protective structures. To derive the overall response of the composite material to shock type loading, a dynamic- mixture model is employed. Within this model, the known constitutive responses of the constituent materials are combined using the appropriate mixture rules. These mixture rules are of a dynamic character since they depend on the current state of the composite material and cannot be applied prior to the beginning of the analysis. The approach is applied to a prototypical MMC consisting of an aluminum matrix and SiC particulates. Both the intermediate-to-strong shock regime (in which the contribution of stress deviators to the stress field can be ignored) and the weak shock regime (in which stress deviators provide a significant contribution to the stress field) are investigated. Finally, the computational results are compared with their experimental counterparts available in the open literature in order to validate the computational procedure employed. Prediction of the spallation-type failure in a metal-matrix composite material (modeled using the dynamic-mixture model) has not been done previously.
Keywords Aluminum
Composite materials
Computations
Dynamic mixture models
Mechanical shock
Metal matrix composites
Structured shocks
Wave propagation


 
Source Agency Non Paid ADAS
NTIS Subject Category 99D - Basic & Synthetic Chemistry
71F - Composite Materials
72B - Algebra, Analysis, Geometry, & Mathematical Logic
Corporate Author Clemson Univ., SC. Dept. of Mechanical Engineering.
Document Type Journal article
Title Note Journal article.
NTIS Issue Number 1325
Contract Number W911NF-09-1-0513 W911NF-06-2-0042

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