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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 82Analytical and Numerical Study of Early-Time...

Analytical and Numerical Study of Early-Time Response in Pulse-Loaded Visco-Elastic Composites

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Abstract:

Hyperbolic partial differential equations with one space variable are used to investigate the longitudinal wave propagation through an elastic composite medium. A high order Lagrangian finite element is used to model the wave propagation and the weak-form Galerkin weighted residual method is adopted for solving the governing differential equations, viz., the one-dimensional wave equation which is extended to include damping and strain-rate effects. The numerical solutions are compared to analytical solutions (where they exist) and excellent temporal and spatial correlation is achieved, within 90-95% accuracy. It is found that damping leads to a decrease in peak stresses and strains by up to 11% for 5% of critical damping, even during the direct loading phase. It is shown that the inclusion of strain-rate did not have an effect on strains but led to an increase in stresses by almost 95%. The inclusion of both damping and strain-rate effects together increased stress values by up to 70% compared to the non-viscous cases.

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Periodical:

Applied Mechanics and Materials (Volume 82)

Pages:

214-219

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.82.214

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Online since:

July 2011

Authors:

Karl Micallef, Arash Soleiman-Fallah, Paul T. Curtis, Daniel J. Pope, Luke A. Louca

Keywords:

Composite Material, Damping, Spalling, Strain Rate Effect, Wave Propagation

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