Cohesive and continuum damage models applied to fracture characterization of bonded joints

• Type: Article in International Scientific Journal
• Date: 2006

Authors

de Moura, MFSF (Author) FEUP; Chousal, JAG (Author) FEUP

Journal

Title: International Journal of Mechanical Sciences

Vol. 48

Pages: 493-503

ISSN: 0020-7403

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 25 Citations

Scopus - 37 Citations

Scientific classification

FOS: Engineering and technology > Mechanical engineering

Other information

Authenticus ID: P-004-KZB

DOI: 10.1016/j.ijmecsci.2005.12.008

Abstract (EN): In this work, two different methods for simulating damage propagation are presented and applied to fracture characterization of bonded joints in pure modes I and II. The cohesive damage model is based on a special developed interface finite element including a linear softening damage process. In the continuum damage model the softening process is performed by including a characteristic length associated with a given Gauss point. The models were applied to the simulation of "double cantilever beam" (DCB) and "end notched flexure" (ENF) tests used to obtain the critical strain release rates in mode I and 11 of bonded joints. In mode I it was observed, under certain conditions, a good agreement between the results obtained by the two models with the reference value of critical strain energy release rate in mode I (G(Ic)), which is an inputted parameter. However, in mode II some discrepancies on the obtained G(IIc), values were observed between the two models. These inaccuracies can be explained by the simplifying assumptions inherent to the cohesive model. Better results were achieved considering the crack equivalent concept.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 11