Mixed-mode I+II fatigue/fracture characterization of composite bonded joints using the Single-Leg Bending test

In this work, fatigue/fracture characterization of composite bonded joints is performed using the Single-Leg Bending (SLB) test. The SLB test provides a mixed-mode I+II loading with a fixed mode mixity. Specimens of carbon fibre reinforced epoxy bonded with a ductile epoxy adhesive were tested consi...

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Bibliographic Details
Published in:Composites. Part A, Applied science and manufacturing Applied science and manufacturing, 2013-01, Vol.44, p.63-69
Main Authors: Fernández, M.V., de Moura, M.F.S.F., da Silva, L.F.M., Marques, A.T.
Format: Article
Language:English
Subjects:
A. Carbon fibre
Applied sciences
B. Fatigue
C. Damage mechanics
carbon fibers
Composites
D. Mechanical testing
energy
epoxides
Exact sciences and technology
Forms of application and semi-finished materials
Laminates
monitoring
Polymer industry, paints, wood
Technology of polymers
testing
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Summary:In this work, fatigue/fracture characterization of composite bonded joints is performed using the Single-Leg Bending (SLB) test. The SLB test provides a mixed-mode I+II loading with a fixed mode mixity. Specimens of carbon fibre reinforced epoxy bonded with a ductile epoxy adhesive were tested considering two load levels. The applicability of the Paris-law establishing a relationship between the fatigue crack growth rate and the variation of the energy release rate was analyzed. An equivalent crack method was used to overcome the difficulties associated to crack monitoring during the fatigue tests. Consistent results were obtained for the lower load level, thus proving the adequacy of the SLB test concerning fatigue/fracture characterization of bonded joints.
ISSN:1359-835X
1878-5840
DOI:10.1016/j.compositesa.2012.08.009