循环载荷下基于弹性安定临界状态的船体板极限强度研究  

Numerical simulation of ultimate strength of hull plate based on critical state ofelastic shakedown under cyclic loading

作　　者：崔虎威 陈泽民 丁启印 CUI Huwei;CHEN Zemin;DING Qiyin(School of Shipping and Naval Architecture,Chongqing Jiaotong University,Chongqing 400074,China)

机构地区：[1]重庆交通大学航运与船舶工程学院,重庆400074

出　　处：《中国舰船研究》2023年第5期150-156,共7页Chinese Journal of Ship Research

基　　金：国家自然科学基金青年基金资助项目(52001040);重庆市自然科学基金面上项目资助(cstc2021jcyj-msxmX0944);重庆市教委科学研究青年基金资助项目(KJQN202000712);国家水运安全工程技术研究中心开放基金资助项目(A2021003);内河航运技术湖北省重点实验室开放基金资助项目(NHHY2021004)。

摘　　要：[目的]为了提高船体板极限强度评估的准确性,对船体板开展循环载荷下基于弹性安定临界状态的极限强度非线性有限元数值模拟。[方法]采用有限元软件ANSYS,重点研究理想弹塑性模型、循环塑性Chaboche材料模型对达到弹性安定临界状态后船体板焊接残余应力释放及极限强度的影响。[结果]结果显示,焊接残余应力经过第1次循环后基本得到释放,在达到弹性安定状态后船体板残余应力趋于稳定;在循环载荷下达到弹性安定状态后,算例采用Chaboche模型所得极限强度要高于理想弹塑性模型。[结论]在开展循环载荷下基于弹性安定临界状态的船体板极限强度非线性有限元数值模拟时,应选择将材料强化与鲍辛格效应考虑在内的材料模型,所得结果对进一步研究船体结构在循环载荷作用下的极限强度有一定的参考价值。[Objectives]In order to improve the accuracy of the ultimate strength evaluation of hull plates,this study carries out a nonlinear finite element numerical simulation of the ultimate strength of ship hull plates under cyclic loading based on the critical state of elastic shakedown.[Methods]Finite element software ANSYS is used to primarily investigate the effects of elastic-perfectly plastic and cyclic-plastic Chaboche material models on the release of welding residual stress and ultimate strength of hull plates after reaching the critical state of elastic shakedown.[Results]The results show that after the first cycle,the welding residual stress is basically released and tends to become stable after reaching the elastic shakedown state under cyclic loading,at which point the ultimate strength of the Chaboche model is greater than that of the elastic-perfectly plastic model.[Conclusions]When performing the nonlinear finite element numerical simulation of the ultimate strength of ship hull plates under cyclic loading based on the critical state of elastic shakedown,it is necessary to select a material model that takes into account material hardening and the Bauschinger effect.The obtained results have a certain reference value for further research on the ultimate strength of hull structures under cyclic loading.

关 键 词：循环载荷 弹性安定 Chaboche模型 极限强度 

分 类 号：U661.43[交通运输工程—船舶及航道工程]