Recently, it has been found that submarine pressure hulls constructed from fiber-reinforced multilayers have great potential to replace classical metallic ring-stiffened pressure hulls. The strength and stability of these structures are the most important functional requirements and should be considered in any design procedure. This study aimed to optimize the strength and buckling stability of elliptical composite deep-submerged pressure hulls using two different filament winding patterns, namely geodesic and planar. The numerical modeling of the pressure hull under hydrostatic was carried out using the Finite Element Method (FEM) in ABAQUS using Python script and a damage model written as a User MATerial (UMAT) Subroutine. Puck failure criterion was chosen for failure prediction. The results suggest that both buckling and the static material failure should be considered in the design of a composite pressure hull. Moreover, it was shown that the optimum pressure hull has a geodesic filament winding pattern with a/b (the ratio between two diameters) =1.2 and the winding angle of 45°. Based on the progressive failure criterion, for such an optimum design, failure initiates at an applied load of 28.6 MPa and the pressure hull withstands to 40.3 MPa.

近来，已经发现由纤维增强的多层构造的海底耐压船体具有巨大的潜力来替代经典的金属环加强耐压船体。这些结构的强度和稳定性是最重要的功能要求，应在任何设计程序中予以考虑。这项研究旨在利用测地线和平面两种不同的细丝缠绕方式，优化椭圆复合材料深潜耐压船体的强度和屈曲稳定性。使用ABAQUS中的有限元方法（FEM），使用Python脚本和作为用户材料（UMAT）子例程编写的损伤模型，对静水压力下的压力壳进行了数值建模。选择圆盘故障准则进行故障预测。结果表明，在复合耐压船体的设计中应同时考虑屈曲和静态材料破坏。此外，已经表明，最佳耐压船体具有测地线长丝缠绕图案，其a / b（两个直径之间的比率）= 1.2，缠绕角度为45°。根据渐进式破坏准则，对于这种最佳设计，在施加28.6 MPa的载荷时会引发破坏，并且耐压壳承受40.3 MPa。