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Influence of mode mixity and loading conditions on the fatigue crack growth behaviour of an epoxy adhesive
Author(s) -
Monteiro Joao,
AkhavanSafar Alireza,
Carbas Ricardo,
Marques Eduardo,
Goyal Rakesh,
Elzein Mohamad,
Silva Lucas F.M.
Publication year - 2020
Publication title -
fatigue and fracture of engineering materials and structures
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.887
H-Index - 84
eISSN - 1460-2695
pISSN - 8756-758X
DOI - 10.1111/ffe.13125
Subject(s) - materials science , adhesive , paris' law , composite material , epoxy , crack closure , fracture mechanics , epoxy adhesive , fracture (geology) , structural engineering , layer (electronics) , engineering
Adhesive joints usually experience mixed mode and mostly cyclic stresses conditions during their service life. The aim of the current research is to investigate the fatigue behaviour of a structural epoxy adhesive. Pure modes I and II and mixed mode tests were carried out to study the fracture and fatigue crack growth (FCG) behaviour of the adhesive. Compliance‐based beam method was considered for experimental fracture energy measurement. The effects of load level and load ratio on the mode I FCG behaviour and Paris law parameters were also investigated. Result showed that the effect of load level on fatigue crack propagation is more pronounced for lower R ratios. It was found that when the crack faces are closer during the unloading process, the difference between the R 2 and G min / G max is higher. Some possibilities are the crack closure phenomenon, difficulty in measuring the G min , and the employed data reduction approach.