A straightforward method to obtain the cohesive laws of bonded joints under mode I loading

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

Authors

de Moura, MFSF (Author) FEUP; Goncalves, JPM (Author) Other; Magalhaes, AG (Author) Other

Journal

Title: International Journal of Adhesion and Adhesives

Vol. 39

Pages: 54-59

ISSN: 0143-7496

Publisher: Elsevier

Indexing

ISI Web of Knowledge - 46 Citations

ISI Web of Science

Scopus - 59 Citations

Scientific classification

FOS: Engineering and technology > Chemical engineering

Other information

Authenticus ID: P-002-37F

DOI: 10.1016/j.ijadhadh.2012.07.008

Abstract (EN): A simple procedure to measure the cohesive laws of bonded joints under mode I loading using the double cantilever beam test is proposed. The method only requires recording the applied load-displacement data and measuring the crack opening displacement at its tip in the course of the experimental test. The strain energy release rate is obtained by a procedure involving the Timoshenko beam theory, the specimen's compliance and the crack equivalent concept. Following the proposed approach the influence of the fracture process zone is taken into account which is fundamental for an accurate estimation of the failure process details. The cohesive law is obtained by differentiation of the strain energy release rate as a function of the crack opening displacement. The model was validated numerically considering three representative cohesive laws. Numerical simulations using finite element analysis including cohesive zone modeling were performed. The good agreement between the inputted and resulting laws for all the cases considered validates the model. An experimental confirmation was also performed by comparing the numerical and experimental load-displacement curves. The numerical load-displacement curves were obtained by adjusting typical cohesive laws to the ones measured experimentally following the proposed approach and using finite element analysis including cohesive zone modeling. Once again, good agreement was obtained in the comparisons thus demonstrating the good performance of the proposed methodology.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 6