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Development and parameterization of an equilibrium material model for segmented polyurea

Development and parameterization of an equilibrium material model for segmented polyurea Purpose – The purpose of this paper is to develop and parameterize a time‐invariant (equilibrium) material mechanical model for segmented polyureas, a class of thermoplastically linked co‐polymeric elastomers, using experimental data available in open literature. Design/methodology/approach – The key components of the model are developed by first constructing a simple molecular‐level microstructure model and by relating the microstructural elements and intrinsic material processes to the material mechanical response. The new feature of the present material model relative to the ones currently used is that the physical origin and the evolution equation for the deformation‐induced softening and inelasticity observed in polyureas are directly linked to the associated evolution of the soft‐matrix/hard segment molecular‐level microstructure of this material. The model is first developed for the case of uniaxial loading, parameterized using one set of experimental results and finally validated using another set of experimental results. Findings – The validation procedure suggested that the model can reasonably well account for the equilibrium mechanical response of polyureas under the simple uniaxial loading conditions. Originality/value – The present approach enables a more accurate determination of the mechanical behavior of polyurea and related elastomeric materials. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Multidiscipline Modeling in Materials and Structures Emerald Publishing

Development and parameterization of an equilibrium material model for segmented polyurea

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References (27)

Publisher
Emerald Publishing
Copyright
Copyright © 2011 Emerald Group Publishing Limited. All rights reserved.
ISSN
1573-6105
DOI
10.1108/15736101111157064
Publisher site
See Article on Publisher Site

Abstract

Purpose – The purpose of this paper is to develop and parameterize a time‐invariant (equilibrium) material mechanical model for segmented polyureas, a class of thermoplastically linked co‐polymeric elastomers, using experimental data available in open literature. Design/methodology/approach – The key components of the model are developed by first constructing a simple molecular‐level microstructure model and by relating the microstructural elements and intrinsic material processes to the material mechanical response. The new feature of the present material model relative to the ones currently used is that the physical origin and the evolution equation for the deformation‐induced softening and inelasticity observed in polyureas are directly linked to the associated evolution of the soft‐matrix/hard segment molecular‐level microstructure of this material. The model is first developed for the case of uniaxial loading, parameterized using one set of experimental results and finally validated using another set of experimental results. Findings – The validation procedure suggested that the model can reasonably well account for the equilibrium mechanical response of polyureas under the simple uniaxial loading conditions. Originality/value – The present approach enables a more accurate determination of the mechanical behavior of polyurea and related elastomeric materials.

Journal

Multidiscipline Modeling in Materials and Structures – Emerald Publishing

Published: Aug 9, 2011

Keywords: Segmented polyureas; Material model development; Impact‐protection/blast‐mitigation; Polymers; Elastomers

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