Viscoelastic modelling of creep and stress relaxation behaviour in PLA-PCL fibres

• Type: Article in International Scientific Journal
• Date: 2017

Authors

Rui Miranda Guedes (Author) FEUP; Singh, A (Author) Other; Pinto, V (Author) Other

Journal

Title: Fibers and Polymers

Vol. 18

Pages: 2443-2453

ISSN: 1229-9197

Publisher: KOREAN FIBER SOCIETY

Indexing

ISI Web of Knowledge - 8 Citations

Scopus - 8 Citations

Other information

Authenticus ID: P-00N-CYW

DOI: 10.1007/s12221-017-7479-y

Abstract (EN): In case of high performance athletes, ligaments are the most commonly injured tissues. Current gold standard process for replacement of ligament is autografting. Research in the field of biodegradable polymers (as a possible ligament device) has helped in overcoming the various drawbacks of autografting. Biodegradable blend of polylactic acid and polycaprolactone (PLA-PCL) have been proposed for use in a medical device to repair injured ligaments. By using a mathematical model, this study aims to characterise the non-linear viscoelastic properties of PLA-PCL fibres. In the present study, two modified models were used; the Burger's model and three-element standard solid model. The model parameters were calibrated by using the tensile and creep experimental data. In case of Burger's model, the parameters were significantly affected by the stress level. This functional stress dependency was represented by a second degree polynomial. By employing the previously computed parameters, the stress relaxation data of PLA-PCL fibres was used to check the model simulations. Only the predictions generated from the modified three-element standard solid model were found to be in an agreement with the experimental data. This model enables representing the general viscoelastic response of PLA-PCL fibres through a unique set of parameters.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11