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1. Fatigue degradation mechanisms
Damage to a material is defined as all the changes that lead to irreversible microstructural deterioration.
When a laminated composite structure is subjected to stress, the degradation of its properties takes effect well before failure. Moreover, when the structure is highly anisotropic, as is the case with high-performance composites, the geometry of the defects no longer depends on the loading mode, as is generally the case with metallic materials, but mainly on the geometric arrangement of the composite's constituents.
The same damage patterns, typical of unidirectional laminated structures, develop under both static and fatigue loading. At different material scales, this damage is characterized by :
on a microscopic scale, by loss of adhesion between...
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Fatigue degradation mechanisms
Fatigue life prediction. Notion of endurance curve
Bibliography
Software tools
Commercial finite element calculation codes (ABAQUS, ANSYS...) do not perform fatigue calculations, but calculate for a given number of cycles. The material characteristics then correspond to the residual properties for the number of cycles concerned. The question then remains: for which cycles is it wise to perform these calculations? The answer can be found in the cycle skipping techniques mentioned in [AM 5 410] § 8.2....
Events
ICFC5, Fifth International Conference on Fatigue of Composites 16-19, October 2010 Nanjing, China.
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Organizations – Federations – Associations (non-exhaustive list)SF2M, Société Française de Métallurgie et de Matériaux. Fatigue Commission http://www.sf2m.asso.fr
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