Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments

Nirmal Kumar Rai; Emilio M Escauriza; Daniel E Eakins; H.S Udaykumar

doi:10.1016/j.jmps.2020.104075

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Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments

Journal article

Peer reviewed

Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments

Nirmal Kumar Rai, Emilio M Escauriza, Daniel E Eakins and H.S Udaykumar

Journal of the mechanics and physics of solids, Vol.143, p.104075

10/2020

DOI: 10.1016/j.jmps.2020.104075

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https://ora.ox.ac.uk/objects/uuid:b295a79b-6ed0-4935-8931-349f592da301View

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Abstract

Head-to-head comparisons are made between calculations and experimental data on shock-driven pore collapse in the transparent material, poly(methyl methacrylate) (PMMA). Simulations are performed using SCIMITAR3D, an Eulerian sharp-interface multi-material code, while plate impact experiments are visualized using ultra-high speed x-ray imaging. The experiments and simulations are conducted over a wide range of loading conditions; from low strength loading regimes where adiabatic shear banding predominates all the way up to the regime where hydrodynamic pore collapse is expected. PMMA is modeled using an isotropic rate-dependent plasticity model for the deviatoric stress response and a Tillotson equation of state for the pressure. Calculations are primarily done in 2D, to save computational effort, but a limited number of 3D calculations are also performed to assess the differences entailed by the dimensionality. The 2D calculations are in fairly good agreement with the experimental results, for the evolution of pore shape. 3D calculations, while quite computationally intense, indeed produce better agreement with experimental data. The computations also agree well with the experiments in delineating the loading strength at which a transition from the strength-dominated to hydrodynamics-dominated pore collapse occurs. This work provides confidence in the ability of Eulerian, sharp interface computational techniques to correctly represent and understand the mechanics of shock-loaded porous condensed phase materials over a range of loading conditions.

Adiabatic shear bands

Cavity collapse

Energetic materials

Hydrodynamic collapse

Jetting

PMMA

Pore collapse

Rate dependent plasticity

Shocks

Void collapse

Details

Title: Subtitle: Mechanics of shock induced pore collapse in poly(methyl methacrylate) (PMMA): Comparison of simulations and experiments
Creators: Nirmal Kumar Rai - Department of Mechanical Engineering, The University of Iowa, Iowa City, IA 52242, United States
Emilio M Escauriza - Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
Daniel E Eakins - Department of Engineering Science, University of Oxford, Oxford, OX1 3PJ, UK
H.S Udaykumar - Department of Mechanical Engineering, The University of Iowa, Iowa City, IA 52242, United States
Resource Type: Journal article
Publication Details: Journal of the mechanics and physics of solids, Vol.143, p.104075
DOI: 10.1016/j.jmps.2020.104075
ISSN: 0022-5096
eISSN: 1873-4782
Publisher: Elsevier Ltd
Grant note: name: AFRL/RWML, award: FA8651-16-1-0005; name: Eglin AFB
Language: English
Date published: 10/2020
Academic Unit: IIHR--Hydroscience and Engineering; Injury Prevention Research Center; Mechanical Engineering
Record Identifier: 9984121870002771

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