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Influence of pre-bond moisture in the adherents on the fracture toughness of bonded joints for composite repairs

The mechanical performance of composite components repaired with bonded patches depends on the moisture content of the adherents. There is a need to define drying procedures which guarantee the quality of the bonded joint. An experimental investigation has been carried out on the effect of pre-bond moisture on the fracture toughness (GIC) and failure behavior of repair joints bonded with adhesive films. Substrates were conditioned by immersion in distilled water at 70 C for 336 h and subsequently dried for 1 h or 24 h to achieve different moisture contents before bonding. Specimens of bonded joints were tested under mode I loading at room temperature. The fracture toughness (GIC) decreased with increasing pre-bond moisture level in the substrates. Fractographic inspection revealed an enhancement of the cohesive mode of failure as the pre-bond moisture decreased. Extending the duration of the drying operation of the substrate with pre-bond moisture, caused an improvement in the fracture toughness of the joint, although not a full recovery of the reference values obtained in absence of pre-bond moisture

This work has been partially supported by an AIRBUS contract, and by the Spanish Ministerio de Economia y Competitividad through the grant MAT2012-37552-C03-03

© International Journal of Adhesion and Adhesives, 2014, vol. 49, p. 80-89

Elsevier

Author: Budhe, Sandip Rudha
Rodríguez Bellido, Ana Teresa
Renart Canalias, Jordi
Mayugo Majó, Joan Andreu
Costa i Balanzat, Josep
Date: 2014 March
Abstract: The mechanical performance of composite components repaired with bonded patches depends on the moisture content of the adherents. There is a need to define drying procedures which guarantee the quality of the bonded joint. An experimental investigation has been carried out on the effect of pre-bond moisture on the fracture toughness (GIC) and failure behavior of repair joints bonded with adhesive films. Substrates were conditioned by immersion in distilled water at 70 C for 336 h and subsequently dried for 1 h or 24 h to achieve different moisture contents before bonding. Specimens of bonded joints were tested under mode I loading at room temperature. The fracture toughness (GIC) decreased with increasing pre-bond moisture level in the substrates. Fractographic inspection revealed an enhancement of the cohesive mode of failure as the pre-bond moisture decreased. Extending the duration of the drying operation of the substrate with pre-bond moisture, caused an improvement in the fracture toughness of the joint, although not a full recovery of the reference values obtained in absence of pre-bond moisture
This work has been partially supported by an AIRBUS contract, and by the Spanish Ministerio de Economia y Competitividad through the grant MAT2012-37552-C03-03
Format: application/pdf
ISSN: 0143-7496
Document access: http://hdl.handle.net/10256/10909
Language: eng
Publisher: Elsevier
Collection: MINECO/PN 2013-2015/MAT2012-37552-C03-03
Reproducció digital del document publicat a: http://dx.doi.org/10.1016/j.ijadhadh.2013.12.007
Articles publicats (D-EMCI)
Is part of: © International Journal of Adhesion and Adhesives, 2014, vol. 49, p. 80-89
Rights: Tots els drets reservats
Subject: Resistència de materials
Strength of materials
Mecànica de fractura
Fracture mechanics
Assaigs de materials
Materials -- Testing
Lligants (Materials)
Binders (Materials)
Title: Influence of pre-bond moisture in the adherents on the fracture toughness of bonded joints for composite repairs
Type: info:eu-repo/semantics/article
Repository: DUGiDocs

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