Composite laminate oriented reliability analysis for fatigue life under non-probabilistic time-dependent method

The problem of composite laminate fatigue assessment under small samples and less probability information is always concentrated, and the mechanical properties of composite structure are deteriorated due to damage accumulation effect of fatigue issue. On the basis of analyzing the current reliability modeling method, this paper developed the reliability evaluation strategy based on the non-probability theory, and considering composite structure response to the external cycle load influence, time-varying reliability analysis model is established, which is different from the quasi-static analysis method, and finally the application for composite structure fatigue problem based on the non-probability of the time-varying reliability analysis is put forward. In the proposed method, every single layer reliability is analyzed combining the non-probabilistic theory with Tsai-Wu failure criterion model, comparing with the traditional probabilistic reliability theory, the method of non-probability is not constrained by probability distribution information, in view of that, the approach has stronger practicability; Introducing for the first-passage conceptions, the crossing rate is evaluated through the non-probabilistic reliability method, finally the time-varying reliability index of composite material structure is established. After analysis steps are given in detail, laminated plate structure is presented to demonstrate the validity and reasonability of the developed methodology.