轴向循环载荷下裂纹板和加筋板极限强度  

Ultimate Strength of Cracked Plates and Stiffened Plates under Axial Cyclic Loads

作　　者：胡康 杨平[1] 夏添[1] 宋月林 李闯 HU Kang;YANG Ping;XIATian;SONG Yuelin;LI Chuang(School of Naval Architecture,Ocean and Energy Power Engineering,Wuhan University of Technology,Wuhan 430063,China;Marine Design and Research Institute of China,Shanghai 200011,China)

机构地区：[1]武汉理工大学船海与能源动力工程学院,武汉430063 [2]中国船舶及海洋工程设计研究院,上海200011

出　　处：《船舶工程》2022年第3期40-47,共8页Ship Engineering

基　　金：国家自然科学基金项目资助(51779198)。

摘　　要：为保障船体总纵强度的安全性,对裂纹板和加筋板在轴向循环载荷下的极限承载性能进行研究。采用系列光板和筋-板组合试件模拟船体板和加筋板构件,并在板上预制初始裂纹,对其在轴向循环载荷下的极限承载力进行试验研究。最后对试件的极限承载力进行数值分析,将所得结果与试验结果进行对比,并将由循环载荷引起的塑性累积和疲劳裂纹扩展均考虑在内。通过数值分析和试验研究得到板上裂纹长度、筋上裂纹长度、疲劳损伤因子、裂纹张开位移和挠度,分析发现这些参数(尤其是裂纹长度)对轴向循环载荷下裂纹板和加筋板的极限强度有一定影响。It is of great significance to study the ultimate strength characteristics of hull plates and stiffened plates under axial cyclic loads to guarantee the safety of the ship hull’s longitudinal strength. Series of specimens which consist of unstiffened plate and the combination of plate and stiffener are adopted to simulate the hull plates and stiffened plates, and the initial crack was only prefabricated on the plate. Specimen tests for the ultimate strength of cracked plates and stiffened plates under axial cyclic load were carried out. At last, numerical analyses were performed to assess the ultimate strength and compared with the specimen test results. In this paper, both accumulated plastic and fatigue crack propagation due to cyclic loads are considered. From the numerical analyses and specimen tests, the crack length on the plate and stiffener, fatigue damage factor, crack opening displacement and deflection have been obtained and it is found out that these parameters, especially the crack length, have a certain effect on the ultimate strength of cracked plates and stiffened plates under axial cyclic loads.

关 键 词：循环载荷 极限强度 裂纹扩展 试验 数值分析 

分 类 号：U661.43[交通运输工程—船舶及航道工程]