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

• Tipo: Artigo em Revista Científica Internacional
• Data: 2020

Autores

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

Revista

Título: Journal of Adhesion

Vol. 96 Nº 5

Páginas: 300-320

ISSN: 0021-8464

Editora: Taylor & Francis

Indexação

ISI Web of Knowledge - 10 Citações

Scopus - 14 Citações

Outras Informações

ID Authenticus: 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.

Idioma: Inglês

Tipo (Avaliação Docente): Científica

Nº de páginas: 21