Center for Process Simulation and Design, University of Illinois

Robert B. Haber, Duane D. Johnson, and Jonathan A. Dantzig, NSF DMR-01-21695

Simulation of Dynamic Particle Dewetting in Composite Material

Robert B. Haber , Theoretical & Applied Mechanics, University of Illinois at Urbana –Champaign

Research objective:

We study the action of shock waves on composite materials with inclusions, as in solid-fuel rocket grains. The need to resolve shock fronts and interfacial damage processes between the matrix and the inclusions makes this a multiscale simulation problem. Numerical simulations predict mechanical response, including shock –induced dewetting of inclusions.

Approach:

Adaptive spacetime discontinuous Galerkin methods solve multiscale elastodynamics problems; a nonlinear cohesive traction –separation law models the dewetting process.

Significant results:

In a first high-resolution study of this problem, we observe a complex history of dewetting and rewetting driven by reflections and focusing of shocks between and within the inclusions.

Broader impact:

These studies provide new insights into the complex behaviour of composite materials under shock loading. These provide a foundation for understanding microstructural damage mechanisms in composite systems and a necessary foundation for modelling detonation in energetic materials.

Research Assistants: Reza Abedi, Morgan Hawker; Dept. of Theoretical & Applied Mechanics Research Scientist: Karel Matous, Center for Simulation of Advanced Rockets

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Elastodynamic simulation of particle dewetting:

An adaptive spacetime discontinuous Galerkin model simulates shock – induced dewetting and rewetting of stiff inclusions. Height and color fields depict velocity magnitude and strain-energy density.

Reflections, surface waves and focusing effects within the circular inclusions create a complex history of dewetting and rewetting.

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