Fatigue and fracture behavior of adhesive-bonded structures in the light of the surface morphology

In order to obtain light weight structures, the adhesive-bonding technique has been established since many years, especially in the aircraft industry. In principle, light weight structures consist of carbon fiber-reinforced plastics (CFRP) or Al-based alloys. Under external forces, the mechanical be...

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Bibliographic Details
Published inInternational journal of adhesion and adhesives Vol. 88; pp. 74 - 80
Main Authors Gudladt, H.-J., Frömmel, St
Format Journal Article
LanguageEnglish
Published Kidlington Elsevier Ltd 01.01.2019
Elsevier BV
Subjects
Adhesive bonding
Adhesive strength
Aircraft components
Aircraft industry
Aluminum alloys
Aluminum base alloys
Bonding strength
Carbon fiber reinforced plastics
Cohesion
Crack propagation
Damage assessment
Defects
Fatigue
Fatigue failure
Fracture
Fracture mechanics
Lap shear
Laser beams
Materials fatigue
Mechanical properties
Morphology
Polymers
Reinforced plastics
Substrates
Weight reduction
Lap shear
Fatigue
Fracture
Adhesive bonding
Defects
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Summary:In order to obtain light weight structures, the adhesive-bonding technique has been established since many years, especially in the aircraft industry. In principle, light weight structures consist of carbon fiber-reinforced plastics (CFRP) or Al-based alloys. Under external forces, the mechanical behavior of the adhesive-bonded structure was determined by cohesive and adhesive forces. Consequently both, the cohesive as well as the adhesive strength must be as high as possible to obtain structures that resist high external forces. The mechanical behavior of the bonded structure depends sensitively on the quality of the surface prior to the curing process. In case of adhesive - bonded Aluminum-based structures, the surface can be improved by a special laser beam treatment. It can be shown that the morphology of the internal surface between the substrate and the adhesive determines the adhesive strength and, consequently, the mechanical behavior of the bonded structure. The kind and critical force of fracture (cohesive or adhesive) can be explained by using a damage model that takes the kind and distribution of characteristic defects into account.
ISSN:0143-7496
1879-0127
DOI:10.1016/j.ijadhadh.2018.10.016