Adhesive thickness effects on the mixed-mode fracture toughness of bonded joints

• Type: Article in International Scientific Journal
• Date: 2020

Authors

Oliveira, JJG (Author) Other; Campilho, RDSG (Author) Other; Silva, FJG (Author) Other; Marques, EAS (Author) FEUP; Machado, JJM (Author) FEUP; da Silva, LFM (Author) FEUP

Journal

Title: Journal of Adhesion

Vol. 96 No. 5

Pages: 300-320

ISSN: 0021-8464

Publisher: Taylor & Francis

Indexing

ISI Web of Knowledge - 10 Citations

Scopus - 14 Citations

Other information

Authenticus ID: P-00R-923

DOI: 10.1080/00218464.2019.1681269

Abstract (EN): Aiming to predict the strength of bonded joints by techniques such as cohesive zone models (CZM), it is highly relevant to estimate the adhesive strength and fracture toughness (G(C)). Here, the tensile and shear fracture toughness (G(IC) and G(IIC), respectively) and the corresponding mixed-mode behaviour acquire special relevancy. However, it is known that these parameters are highly dependent on the adhesive thickness (t(A)). The present work experimentally addresses the t(A) effect on the mixed-mode behaviour of bonded joints, namely on the tensile and shear fracture energies (G(I) and G(II), respectively), using the Single-Leg Bending (SLB) test. Different data reduction schemes were applied. With this purpose, the respective resistance curves (R-curves) were calculated, which enabled plotting the respective fracture envelope for a sample t(A) by the knowledge of the pure-mode G(IC) and G(IIC). Overall, it was possible to obtain a good agreement between methods for the mixed-mode G(I) and G(II) calculation and to estimate the most suitable fracture envelope of the adhesive for a given t(A). The compliance-based beam method (CBBM) was found to be particularly suited to perform data reduction, since it accounts for the adhesives' ductility and it is not affected by crack length (a) measuring errors.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 21