Non-probabilistic credible reliability analysis method for underwater vehicle composite structure

Abstract

The application discloses a kind of underwater vehicle composite structure non-probabilistic credible reliability analysis method, belong to composite material structure underwater reliability evaluation technical field.The method quantifies the uncertainty of material parameters by non-probabilistic interval model, and interval parameter is set as the uncertain variable subject to Gamma distribution;Combining with the bayes theory, new sample information is introduced to update the parameter, establish the explicit relationship between non-probabilistic quantization set and confidence level, for the static strength failure problem of composite material structure, based on Christensen multi-mode failure criterion to construct failure criterion, uncertainty propagation analysis is carried out using second-order Taylor expansion, the response interval of failure coefficient is obtained, and the credible reliability analysis model of underwater vehicle composite material typical structure is established.The application adjusts the conservativeness of interval model under the premise of ensuring the credibility of model, and has value for the design and reliability analysis of underwater composite material structure.

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