Abstract
The residual strength of fibrous composite materials depends on the remaining fatigue life. Unlike conventional materials, in which failure occurs due to a single crack, in composite materials there is a process of accumulation of many cracks. Therefore, fatigue life is expressed by loading history and residual strength is determined subsequently by the load which will cause eventual failure. A theory is developed which predicts the residual strength based on a cumulative damage concept. Experiments were performed on multidirectional laminated composite material (T300/5208) of varying construction. The results are compared with the theory and good correlation is found. The theory predicts that the residual strength is the same as the static strength for almost all the fatigue life and it starts to degrade only within the final 10% of the fatigue life.
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