Constitutive models for biodegradable thermoplastic ropes for ligament repair

• Tipo: Artigo em Revista Científica Internacional
• Data: 2012

Autores

Andre C Vieira (Autor) FEUP; Rui M Guedes (Autor) FEUP; Volnei Tita (Autor) Outra

Revista

Título: Composite Structures

Vol. 94 Nº 11

Páginas: 3149-3159

ISSN: 0263-8223

Editora: Elsevier

Indexação

ISI Web of Knowledge - 7 Citações

Scopus - 8 Citações

Classificação Científica

FOS: Ciências da engenharia e tecnologias > Engenharia dos materiais

Outras Informações

ID Authenticus: P-002-4AE

DOI: 10.1016/j.compstruct.2012.05.010

Abstract (EN): The concept behind a biodegradable ligament device is to temporarily replace the biomechanical functions of the ruptured ligament, while it progressively regenerates its capacities. However, there is a lack of methods to predict the mechanical behaviour evolution of the biodegradable devices during degradation, which is an important aspect of the project. In this work, a hyper elastic constitutive model will be used to predict the mechanical behaviour of a biodegradable rope made of aliphatic polyesters. A numerical approach using ABAQUS is presented, where the material parameters of the model proposal are automatically updated in correspondence to the degradation time, by means of a script in PYTHON. In this method we also use a User Material subroutine (UMAT) to apply a failure criterion base on the strength that decreases according to a first order differential equation. The parameterization of the material model proposal for different degradation times were achieved by fitting the theoretical curves with the experimental data of tensile tests on fibres. To model all the rope behaviour we had considered one step of homogenisation considering the fibres architectures in an elementary volume.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 11