极端循环载荷下加筋板失效机理与极限强度  

Failure mechanism and ultimate strength of stiffened plates under extreme cyclic load

作　　者：刘葳 蔡庆港 金腾龙 康子雄 李陈峰[1,2] LIU Wei;CAI Qinggang;JIN Tenglong;KANG Zixiong;LI Chenfeng(College of Shipbuilding Engineering,Harbin Engineering University,Harbin 150001,China;International Joint Laboratory of Naval Architecture and Offshore Technology between Harbin Engineering University and Lisbon University,Harbin 150001,China)

机构地区：[1]哈尔滨工程大学船舶工程学院,黑龙江哈尔滨150001 [2]船舶与海洋工程技术教育部国际合作联合实验室,黑龙江哈尔滨150001

出　　处：《哈尔滨工程大学学报》2023年第8期1275-1282,共8页Journal of Harbin Engineering University

基　　金：国家自然科学基金项目(52171305);黑龙江省自然科学基金项目(LH2020E078).

摘　　要：为合理地评估极端海况下船体结构极限强度,本文基于非线性有限元法开展了极端循环载荷下加筋板极限强度研究。基于载荷位移曲线实时追踪和重启动分析提出了一种循环加载控制方法,实现了循环载荷的精准控制,并结合Chaboche混合硬化材料模型,开展了加筋板结构响应和极限强度计算。研究表明:非对称极端循环载荷作用下加筋板将产生塑性应变的累积,即棘轮效应,造成结构承载能力降低。研究成果对于极端海况下船体结构极限强度评估具有指导意义。The ultimate bearing capacity of stiffened plates under extreme cyclic load is studied by using the nonlinear finite element method to perform the ultimate strength behaviour of hull structures under extreme sea conditions reasonably.In this study,a cyclic loading control approach based on the real-time tracking of the load-displacement curve and restart analysis is proposed to control cyclic loading precisely.Meanwhile,the structural response and ultimate strength of the stiffened plates are calculated in combination with the Chaboche mixed hardening material model.Results demonstrate that under the action of asymmetrical extreme cyclic loading,stiffened plates induce the accumulation of plastic strain,that is,the ratchet effect,resulting in the reduction in structural load-bearing capacity.The results of this study have guiding value for the ultimate strength assessment of hull structures under extreme sea conditions.

关 键 词：加筋板 极端循环载荷 混合硬化模型 棘轮效应 失效机理 极限强度 船舶结构 非线性有限元方法 

分 类 号：U663.2[交通运输工程—船舶及航道工程]