Numerical stress solutions for the accurate calibration of hyper-viscoelastic material models of polymer foams
Autor: | Tibor Goda, Bálint Fazekas |
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Rok vydání: | 2020 |
Předmět: |
Materials science
Computer simulation Ogden Applied Mathematics Mechanical Engineering 02 engineering and technology Mechanics 021001 nanoscience & nanotechnology Condensed Matter Physics Compression (physics) Viscoelasticity Simple shear Stress (mechanics) 020303 mechanical engineering & transports 0203 mechanical engineering Mechanics of Materials Modeling and Simulation Compressibility Calibration General Materials Science 0210 nano-technology |
Zdroj: | International Journal of Solids and Structures. :390-400 |
ISSN: | 0020-7683 |
DOI: | 10.1016/j.ijsolstr.2020.01.010 |
Popis: | Proper calibration of material models is one of the essentials of a reliable numerical prediction. It is particularly critical in numerical simulation of highly compressible hyper-viscoelastic solids such as polymer foams. In this study, new finite time increment-based stress solutions are presented for the case when the time-independent behaviour is defined by the generally accepted modified Ogden model (also known as hyperfoam model) while the time dependence is described by the Prony series-based linear viscoelastic model. The stress solutions give the basis of the parameter identification method proposed with which even the temperature-dependent behaviour may be taken into consideration. The following simple loading modes are considered: uniaxial/equibiaxial compression, confined uniaxial/equibiaxial/volumetric compression and simple shear. The stress solutions are then used to identify the material parameters of a compressible, open-cell polyurethane foam. The results demonstrate the capability of numerical stress solutions in calibrating hyper-viscoelastic material models with high accuracy on the basis of any loading mode presented or simultaneous consideration of various loading modes. |
Databáze: | OpenAIRE |
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