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A Nonlinear Viscoelastic Model for Polyurethane Foams
Technical Paper
1999-01-0299
ISSN: 0148-7191, e-ISSN: 2688-3627
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English
Abstract
This paper investigates the viscoelastic behavior of polyurethane foams. A three-dimensional single hereditary integral nonlinear viscoelastic model is developed using the results of stress relaxation experiments in compression, tension, and shear. The material behavior is characterized with the instantaneous dilatational and deviatoric elastic responses together with the normalized relaxation functions. The relaxation of the material is described using three different functions for high compression (above 7% strain), low compression/tension, and shear. The material model is implemented in the LS-DYNA3D program and is validated by comparing the numerical and experimental results.
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Authors
- Kurosh K. Darvish - Automobile Safety Laboratory, University of Virginia
- Erik G. Takhounts - Automobile Safety Laboratory, University of Virginia
- Brett T. Mathews - Automobile Safety Laboratory, University of Virginia
- Jeff R. Crandall - Automobile Safety Laboratory, University of Virginia
- Clifford C. Chou
Topic
Citation
Darvish, K., Takhounts, E., Mathews, B., Crandall, J. et al., "A Nonlinear Viscoelastic Model for Polyurethane Foams," SAE Technical Paper 1999-01-0299, 1999, https://doi.org/10.4271/1999-01-0299.Also In
Polymer Composites and Polymeric Materials for Energy Management and Occupant Safety
Number: SP-1448; Published: 1999-03-01
Number: SP-1448; Published: 1999-03-01
References
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- Puso, M. A. Weiss, J. A. 1998 “Finite Element Implementation of Anisotropic Quasi-Linear Viscoelasticity Using a Discrete Spectrum Approximation,” ASME Journal of Bio-mechanical Engineering 120 62 70