Analysis of a delayed fracture criterion for lifetime prediction of viscoelastic polymer materials

• Type: Article in International Scientific Journal
• Date: 2012

Authors

Rui Miranda Guedes (Author) FEUP

Journal

Title: Mechanics of Time-Dependent Materials

Vol. 16

Pages: 307-316

ISSN: 1385-2000

Publisher: Springer Nature

Indexing

ISI Web of Knowledge - 6 Citations

Scopus - 7 Citations

Scientific classification

FOS: Engineering and technology > Materials engineering

Other information

Authenticus ID: P-002-7DR

DOI: 10.1007/s11043-011-9163-8

Abstract (EN): In this work a multi-axial yield/failure model for viscoelastic/plastic materials is applied, which was developed by Naghdi and Murch (in J. Appl. Mech. 30:321-328, 1963) and later extended and refined by Crochet (in J. Appl. Mech. 33:327-334, 1966), to predict long-term creep rupture of polymers. The criterion defines a function, which depends on time, the viscoelastic properties and applied stress, to establish an empirical law with creep yield (fracture). In this work a linear relationship is proposed, defined as a time-dependent failure criterion, which can be applied for extrapolation purposes. A comparative analysis using energy-based failure criteria is performed. It is proved, for the polymers considered in this study, that the proposed time-dependent failure criterion holds for long times. Experimental data are used to illustrate the applicability of this time-dependent failure criterion.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10