船体中厚钢板局部热压成形中的回弹仿真分析

谢栋,赵耀,董宏宝430074华中科技大学 船舶与海洋工程学院,武汉

Chinese Journal of Ship Research - - 目 次 -

摘 要:[目的]为了研究船体中厚钢板局部热压成形过程中影响回弹的因素,[方法]运用三维热弹塑性有限元仿真方法对影响回弹的参数进行研究和分析,通过一系列数值仿真试验考察板材的整体温度、温度场分布、板材尺寸、局部加载量等参数对其成形回弹的影响。[结果]分析结果表明,当板材成形温度超过材料屈服应力并达到开始显著下降的温度点时,回弹会随温度的升高而开始大幅度减小;由于变形区域的分布特点,在温度3场分布的 个维度中,局部变形范围较大方向的温度分布对回弹的影响占主要部分;加热条件完全相同时,板材长度和宽度方向的尺寸变化对回弹均有一定的影响,其中,局部变形范围较大的板长方向的尺寸变化对回弹的影响更明显,板材回弹随局部加载量的增大而减小。[结论]研究结果有助于实现优化船体中厚钢板自动化成形

的参数获取,对进一步研究船体中厚钢板局部热压成形的回弹问题也具有基础性指导作用。关键词:中厚板;热压成形;回弹;数值仿真;有限元法中图分类号:U671.3 文献标志码:A DOI:10.3969/j.issn.1673-3185.2017.05.017

Numerical simulation of springback of medium-thick plates in local hot rolling

XIE Dong,ZHAO Yao,DONG Hongbao School of Naval Architecture and Ocean Engineering,Huazhong University of Science and Technology, Wuhan 430074,China Abstract:[Objectives] In order to understand the factors of springback in the local hot rolling of medium-thick steel plates,[Methods]a 3D thermal-elastic-plastic analysis is conducted to investigate the factors affecting the amount of springback. Through a series of numerical analyses,the influence of deformation temperature, temperature field distribution, plate size and local loading are examined. [Results] The results show that when the deformation temperature exceeds a certain level at which material yield stress begins to decrease significantly,the springback will reduce markedly with the increase in temperature. Due to the distribution characteristics of the deformation area,the influence of temperature distribution on springback where the local deformation scale is larger is dominated by the three dimensions of temperature field distribution. Changes in the length and width of the plate have a certain influence on the springback,in which changes to the length of a plate where the local deformation scale is larger have a more obvious influence on springback. The springback of the plate decreases with the increase of local loading. [Conclusions] The results of this study can assist in the optimization of parameters in the automatic hot rolling of thick plates,while also having a basic guiding effect on the further study of springback in the local hot rolling of thick plates. Key words:medium-thick plate;hot rolling;springback;numerical simulation;Finite Element Method (FEM) 收稿日期:2017 - 03 - 28 网络出版时间:2017-9-26 10:23基金项目:科技部国际合作专项基金资助(2012DFR80390)作者简介:谢栋,男,1993年生,硕士生。研究方向:船体外板热压成形。E-mail:15927279416@163.com赵耀(通信作者),男,1958年生,教授,博士生导师。研究方向:船舶结构静动态响应。E-mail:yzhaozzz@hust.edu.cn董宏宝,男,1991年生,博士生。研究方向:船体外板曲面滚压成形。E-mail:hbdongnaoe@hust.edu.cn

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