Abstract
AbstractAn engineering approach for fatigue life prediction of fibre‐reinforced polymer composite materials is highly desirable for industries due to the complexity in damage mechanisms and their interactions. This paper presents a fatigue‐driven residual strength model considering the effect of initial delamination size and stress ratio. Static and constant amplitude fatigue tests of woven composite specimens with delamination diameters of 0, 4 and 6 mm were carried out to determine the model parameters. Good agreement with experimental results has been achieved when the modified residual strength model has been applied for fatigue life prediction of the woven composite laminate with an initial delamination diameter of 8 mm under constant amplitude load and block fatigue load. It has been demonstrated that the residual strength degradation‐based model can effectively reflect the load sequence effect on fatigue damage and hence provide more accurate fatigue life prediction than the traditional linear damage accumulation models.
Highlights
Woven composite laminates demonstrate good combined shear strength and impact resistance and are widely used in transport and renewable energy industries.[1]
This paper aims at filling the gap by predicting the fatigue life of woven composite laminates with initial delamination under constant and variable amplitude loading using a modified residual strength model based on the authors' previous research.[33,34]
Good agreement has been achieved between fatigue life predictions and experiments for woven graphite fibre-reinforced polymer (GFRP) and carbon fibre-reinforced polymer (CFRP) composites with 8-mm initial delamination under tension–tension and compression–compression loading
Summary
Woven composite laminates demonstrate good combined shear strength and impact resistance and are widely used in transport and renewable energy industries.[1]. The fatigue behaviour of laminated composite structures is influenced by the initial delamination.[11,12] Preexisting delamination has been linked to the change in failure mode during fatigue tests
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