The treatment of fatigue and damage accumulation in composite design

Abstract Differences between the treatment of damage, damage accumulation and fatigue for various types of advanced composite systems, for example, polymer matrix composites (PMCs), ceramic matrix composites (CMCs) and metal matrix composites (MMCs) are discussed in general. The approach for PMCs from the aspect of damage mechanics is reviewed next and extended to a discussion of various aerospace certification approaches adopted for PMC structures. Following this an explanation of the theoretical foundations for the ‘wearout philosophy’ in conjunction with related damage and fracture mechanics relationships is provided. This concludes with a survey of flaw, or more precisely, damage growth rate exponents for various matrix and/or interface-dominated failure mechanisms for PMCs and adhesively bonded joints.

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