Abstract
ABSTRACT Crack propagation induced by diverse extreme load is one of the main resources of marine engineering structure failure. Many efforts have concentrated on the crack propagation issue of homogeneous plates while few focus on that of huge flexible composite stiffened bags. This paper investigates the crack propagation behaviour of huge flexible composite bag with pressure load through experiments and numerical simulations, and further analyses the effect of different forms of stiffener on the crack growth resistance. Firstly, a hybrid finite element calculation method based on Virtual Crack Closure Technique (VCCT) and Extended Finite Element Method (XFEM) is proposed. Secondly, the crack propagation behavior of the bird-wing type specimens is investigated by experimental analysis and numerical simulation. Finally, the effects of different materials, stiffener width, stiffener thickness, and stiffener cross-sectional shape on the crack propagation path of irregular local skirt bag are analysed.
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