Citation: Marek Pawlikowski. Non-linear Constitutive Model for the Oligocarbonate Polyurethane Material[J]. Chinese Journal of Polymer Science, ;2014, 32(12): 1666-1677. doi: 10.1007/s10118-014-1549-z shu

Non-linear Constitutive Model for the Oligocarbonate Polyurethane Material

Marek Pawlikowski ^1,,

1.
Warsaw University of Technology, Institute of Mechanics and Printing, 02-524 Warszawa, Poland

Corresponding author: Marek Pawlikowski, m.pawlikowski@wip.pw.edu.pl
Received Date: 24 March 2014
Revised Date: 29 May 2014

Fund Project: This work was financially supported by the National Centre for Research and Development through the Project No. 15-0028-10/2010 entitled: Flexible Materials for Use in the Constructions of the Implant of the Intervertebral Disc.

The polyurethane, which was the subject of the constitutive research presented in the paper, was based on oligocarbonate diols Desmophen C2100 produced by Bayer. The constitutive modelling was performed with a view to applying the material as the inlay of intervertebral disc prostheses. The polyurethane was assumed to be non-linearly visco-hyperelastic, isotropic and incompressible. The constitutive equation was derived from the postulated strain energy function. The elastic and rheological constants were identified on the basis of experimental tests, i.e. relaxation tests and monotonic uniaxial tests at two different strain rates, i.e. = 0.1 min-1 and = 1.0 min-1. The stiffness tensor was derived and introduced to Abaqus finite element (FE) software in order to numerically validate the constitutive model. The results of the constants identification and numerical implementation show that the derived constitutive equation is fully adequate to model stress-strain behavior of the polyurethane material.
- Constitutive model,
- Viscoelastic material,
- Stress relaxation,
- Finite elements
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沈阳化工大学材料科学与工程学院沈阳 110142