铝合金舟体承载力的数值分析

Numerical Study on Load-carrying Capacity of Aluminum Alloy Pontoon Hull

为克服钢结构空心舟体的缺点,提出一种填充柔性聚氨酯闭孔泡沫铝合金舟体结构。运用有限元软件ANSYS,研究了中心轮式荷载作用下空心和填充聚氨酯泡沫铝合金舟体的承载力,分析了舷板厚度、隔板厚度和泡沫密度对承载力的影响。结果表明:铝合金舟体具有较大的屈曲后承载能力,极限承载力由材料破坏控制;隔板和舷板厚度大于某临界值时,舟体承载力由甲板控制,继续增大隔板和舷板厚度不能有效提高舟体承载力;填充泡沫应采用低密度泡沫,并可忽略其对舟体承载力的影响。

An aluminum alloy pontoon hull structure filled with flexible polyurethane foam was designed to overcome the disadvantages of steel hollow pontoon hull. Load-carrying capacity of hollow and polyurethane foam-filled hulls under centered wheel load was analyzed with FEM program ANSYS. The influence of the web and diaphragm thicknesses and the foam density on the load-carrying capacity was investigated. The results show that the aluminum alloy pontoon hull has a considerable post-buckling load-carrying capacity and its ultimate load-carring capacity depends on the strength of the material. When the thick-nesses of the diaphragm and web exceeds their critical values,the load-carrying capacity of the hull mainly depends on the deck,and the increase in the thicknesses of the diaphragm and web is not effective to improve the load-carrying capacity. Low density foam is favorable to the foam-filled pontoon hull,and the influence of the foam on the load-carrying capacity is negligible.