Abstract
The simplest, traditional approach to the fatigue design based on nominal stresses and fatigue curves turned out to be unsuitable to represent together data referred to joints of different geometry and to provide a model of general validity. Moreover, the use of fatigue curves, usually made on the basis of the number of cycles to failure, makes it difficult to describe and account for damage evolution. The available experimental results indicate the actual mechanics of fatigue damage evolution in the nucleation of one or more cracks at the critical locations in the joint and their subsequent propagation to the point of joint failure. The fatigue cracks grow at the laminate/adhesive interface or, less frequently, inside the adhesive layer. The majority of the methodologies available for the fatigue life prediction of bonded joints both in metallic or composite materials are based on a fracture mechanics approach, considering the fatigue life of the joint entirely spent in the crack propagation phase. On the assumption that this choice is on the conservative side, in some models the assessment of the nucleation phase is explicitly neglected, in others it is simply not considered.
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