Fatigue behaviour of tensile steel/CFRP joints

In this paper the fatigue performance of tensile steel/CFRP (Carbon Fibre Reinforced Polymer) double shear lap joints is discussed. Joints were realized with two steel plates and two CFRP strips bonded using epoxy adhesive. Fatigue tests were performed on 16 specimens under constant stress range loa...

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Bibliographic Details
Published in:Composite structures 2012-07, Vol.94 (8), p.2407-2417
Main Authors: Colombi, Pierluigi, Fava, Giulia
Format: Article
Language:English
Subjects:
Bond strength
Carbon fiber reinforced plastics
CFRP strips
Debonding
Fatigue
Fatigue (materials)
Fatigue limit
Fatigue tests
Shear
Steel joints
Stress ratio
Structural steels
S–N curve
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Summary:In this paper the fatigue performance of tensile steel/CFRP (Carbon Fibre Reinforced Polymer) double shear lap joints is discussed. Joints were realized with two steel plates and two CFRP strips bonded using epoxy adhesive. Fatigue tests were performed on 16 specimens under constant stress range loading cycles. Two stress ratios (R=0.1 and R=0.4) were considered to investigate their influence on the fatigue lifetime. Debonding was observed to occur at stress concentration zones and propagate along the CFRP/adhesive interfaces. The stiffness degradation of the steel joint due to progressive debonding of the adhesive represents an index for the subsequent and progressive global failure. S–N curves are defined and compared to the fatigue resistance of welded detail categories of the Eurocode 3. The tests showed that the stress ratio, R, has a marginal influence on the fatigue lifetime of the steel/CFRP double shear lap joints. Finally, a fatigue limit corresponding to a stress range in the steel plate equal to 75MPa was conservatively estimated during the tests. The fatigue limit seems to be insensitive to the stress ratio R.
ISSN:0263-8223
1879-1085
DOI:10.1016/j.compstruct.2012.03.001