Time dependent constitutive model for a biopolymer derived from castor oil polyurethane

• Type: Article in International Conference Proceedings Book
• Date: 2014

Authors

Vieira, AC (Author) Other; Tita, V (Author) Other; da Costa, RRC (Author) Other; Guedes, RM (Author) FEUP

Conference proceedings International

Title: BIODENTAL ENGINEERING III

Pages: 191-196

3rd International Conference on Biodental Engineering (BIODENTAL)

Porto, PORTUGAL, JUN 22-23, 2014

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 1 Citation

Scientific classification

FOS: Engineering and technology > Environmental biotechnology

Other information

Authenticus ID: P-009-J34

Abstract (EN): Polyurethane derived from the castor oil has been studied for medical device applications. However, unlike other materials, polymers show a time dependent mechanical behavior at body temperature. Therefore, in this work the material model parameters of a time dependent constitutive model are calibrated based on mechanical test results of this biopolymer. The mechanical tests used to calibrate the Bergstrom-Boyce model were the monotonic tests at different strain rates, creep and relaxation tests on step loading, cyclic loading at different strain levels together in tensile and compression. The non-linear viscoelastic model used in this work was able to capture the time-dependent mechanical behavior of the material under large strains. This three-dimensional constitutive model may be implemented in commercial finite element software packages, this way enabling the mechanical behavior and optimization of the functional compatibility of implants and prostheses produced using this PU.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6