| Citation: | XIN T D，CUI C Y，LIU Y，et al. Non-probabilistic reliability analysis method for propellent tank with crack defect[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（9）：2330-2336 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0651
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During the service period of the propellant tank, the accurate analysis of its crack defects and reliable state with crack defects can not only guarantee the safety of the launch site, but also effectively avoid unnecessary panic, providing a reference for emergency plan formulation. Based on interval theory and failure assessment diagram theory, a non-probabilistic failure assessment diagram (NFAD) is proposed. The reliability analysis of the crack defect of propellant tanks can be effectively conducted when it is difficult to accurately obtain the failure evaluation point and curve in engineering practice. The proposed method is verified with the example parameters. The results show that this method can analyze any state of tank crack defects without accurate failure assessment point and curve, fully considering the uncertainty in the analysis. The binary logic states of failure or reliability of the traditional failure assessment chart method are divided into three cases with he reliability index is equal to 0, the reliability index is greater than 0 and less than 1, and the reliability index is greater than or equal to 1, represent the failure state, reliability degree and safety margin respectively.
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