Nonlinear two-dimensional analysis of manifold marine inflated membrane structures using vector form intrinsic finite element method

Abstract

This study aims to investigate the two-dimensional nonlinear deformation of manifold marine inflatable membrane structures. The vector form intrinsic finite element method is adopted and the pseudo-dynamic stiffness damping is introduced to better get a steady-state solution for quasi-static problems. Three typical marine membrane structures, including the partially submerged pontoon, water-filled dam and finger-bag skirt of a hovercraft, are simulated with rod elements, the spatial varied fluid loads and interaction with deformed structures are considered via user-defined functions. Satisfactory deformation results can be obtained with a simplified two-dimensional profile model. Furthermore, a preliminary analysis of the effects of internal and external pressure on the dam is performed, more accurate hovercraft skirt tension can be obtained than traditional analytical method and the hazardous tuck-under behavior of the skirt is simulated. The models and simulations using vector form intrinsic finite element method are beneficial for understanding the deformation behavior and providing a reference for the design of marine membrane structures.