Abstract
The buckling failure of winding composite pressure hulls (WCPHs) under hydrostatic pressure was experimentally and numerically investigated. For comparison, an aluminium alloy pressure hull (AAPH) control group with the same weight-to-displacement ratio was prepared. A nonlinear buckling analysis model that considers the actual inputs of the hulls was developed using linear buckling mode-shaped imperfections. The failure mechanisms of the WCPHs were analysed by introducing the Hashin and Ye delamination criterion. The simulation showed that stress concentration first occurred at the end of the WCPHs, and further fibre compression damage rapidly expanded from the middle of the outer 90° layer to both ends of the hulls during simulation, which were consistent with the experimental results. The ultimate load of the WCPHs in experiment was 3.1 times higher than that of the control group. The regularities of the imperfection sensitivity and performance comparison of the hulls were also studied by varying three sets of parameters. Overall, our study comprehensively explained the buckling failure mechanism of the WCPHs and demonstrated their significant advantages compared with AAPHs.
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