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Xiong Junjiang
Wu Zhe
Gao Zhentong
Aircraft Design Bureau,
Beijing University of Aeronautics
and Astronautics,
Beijing 100083, China
Shenoi R Ajiat
University of Southampton |
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FATIGUE LIFE PREDICTION THEORY OF COMPOSITE LAMINATES AND
EXPERIMENTAL VERIFICATION*
Abstract: According to traditional
phenomenological fatigue methodology and modern continuum damage
mechanics theory, dual fatigue cumulative damage rules to predict fatigue damage formation and propagation lives of the notched composite laminates are presented. A 3-dimensional damage constitutive equation of anisotropic composites is also established. Damage strain energy release rate is interpreted as a driving force of the fatigue delamination damage propagation. A new damage evolution equation and a damage propagation sa–sm–N* surface (stress amplitude-mean stress-life surface) are derived. Hence, using the method above, the fatigue life of composite components can be predicted. Finally, theoretically predicted results are compared with experimental data. It is found that the deviation of theoretic prediction from experimental results is about 22%.
Key words: Fatigue Life prediction Composite laminates Damage evolution |