外接平板型金属夹层结构连接构件极限强度分析

激光焊接钢质夹层结构在国外已用于实船,其连接形式是亟待解决的关键问题之一。基于有限元分析软件ANSYS,研究了面内载荷作用下,I型金属夹层结构外接平板型连接构件的失效模式和极限承载能力,以及5种典型初始缺陷的尺寸和连接构件的设计参数对极限载荷的影响规律。结果显示,连接构件较短时,结构失效的主导因素是焊接接头形成了塑性铰；连接构件较长时,主导因素是连接构件失稳。对于各种类型的初始缺陷,随初始缺陷尺寸的增大,极限载荷均降低；连接构件、以及靠近连接构件的夹层面板和夹层腹板的初始缺陷对极限载荷的影响较大。在控制重量的条件下,欲增大极限承载能力,最有效的途径是增大连接构件厚度,并选取合适的连接构件长度。

The Ultimate Strength Property Analysis on Cover Plate Joint of Steel Sandwich Panel

The laser welded steel sandwich structures have been used in real ship structures. The connection between sandwich panels is one of the key issues to be solved. The failure mode and ultimate load of the cover plate joint under in-plane loading was analyzed utilizing ANSYS, with the effect of initial imperfections of different size and different types discussed. The sensitivity analysis of design parameters on the ultimate loading was also carried out. It is shown that the invalidation of the joint is mainly caused by the plastic hinge formed in the weld joint when the cover plate joint is short; while the main reason of the structural failure is the buckling of the cover plate joint when the cover plate joint is long. For every type of the initial imperfection mentioned, along with the size of the initial imperfection increased, the ultimate loads decrease. The initial imperfections from the cover plate joint, as well as the face plate and the web plate of the panel near the joint, have a huge influence on the ultimate load. With the mass acceptable, the measures to increase the ultimate load were searched. The most effective way is to increase the thickness of the cover plate joint, with the length of joint properly selected.