Internal Load Distribution Effects During Fatigue Loading of Composite Laminates

TL;DRAbstract

Two fundamental processes govern the reduction of strength and stiffness of composite laminates caused by cyclic loading, commonly called the “fatigue effect.” One process is the reduction of the strength and stiffness of the individual constituent materials in the composite, caused by events such as localized nonconservative deformation, microcrack formation, and substructure variations. This process is essentially the source of the “fatigue effect” homogeneous materials, except that macrocrack formation and fracture dominated by a single crack generally does not occur as a consequence of this process in composite materials. In laminated composites there is another fundamental process which plays a major role in determining residual properties. That process is the damage-dependent redistribution of load sharing among the plies of the laminate caused by the continuous variation of the elastic stiffness properties of each ply induced by microdamage development in those plies. Experience

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