• CN:11-2187/TH
  • ISSN:0577-6686

机械工程学报 ›› 2021, Vol. 57 ›› Issue (1): 28-39.doi: 10.3901/JME.2021.01.028

• 机器人及机构学 • 上一篇    下一篇

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柱壳结构螺栓法兰连接非线性刚度分析

潘嘉诚1,2, 关振群1,2, 曾岩1,2, 孙伟程1,2   

  1. 1. 大连理工大学工程力学系 大连 116024;
    2. 大连理工大学工业装备结构分析国家重点实验室 大连 116024
  • 收稿日期:2019-12-30 修回日期:2020-04-07 出版日期:2021-01-05 发布日期:2021-02-06
  • 通讯作者: 曾岩(通信作者),男,1979年出生,博士,讲师,硕士研究生导师。主要研究方向为非线性随机动力学、航空航天结构和可靠性分析。E-mail:zengyan@dlut.edu.cn
  • 作者简介:潘嘉诚,男,1992年出生,博士研究生。主要研究方向为连接结构非线性动力学。E-mail:jcpan_ls@mail.dlut.edu.cn;关振群,男,1965年出生,教授,博士研究生导师。主要研究方向为重大装备结构强度与可靠性分析、航空航天结构动力学、大规模科学计算建模与网格生成。E-mail:guanzhq@dlut.edu.cn;孙伟程,男,1993年出生,博士研究生。主要研究方向为连接结构非线性动力学。E-mail:sun_wei_cheng@hotmail.com
  • 基金资助:
    国家自然科学基金(11672052,11302035)和中央高校基本科研业务费专项资金(DUT2019TD37)资助项目。

Nonlinear Stiffness Analysis of Bolted Flange Connection in Cylindrical Shell Structure

PAN Jiacheng1,2, GUAN Zhenqun1,2, ZENG Yan1,2, SUN Weicheng1,2   

  1. 1. Department of Engineering Mechanics, Dalian University of Technology, Dalian 116024;
    2. State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian 116024
  • Received:2019-12-30 Revised:2020-04-07 Online:2021-01-05 Published:2021-02-06

摘要: 螺栓法兰装配的柱壳连接结构主要由壳体承载压缩载荷,而由螺栓-法兰结构承载拉伸载荷。当拉伸载荷大于临界值时,法兰盘接触面出现压力零域,即发生局部接触分离进而造成连接刚度损失,令螺栓-法兰连接结构呈轴向刚度非线性特征。为揭示预紧力作用下结构参数对此非线性刚度的影响,基于弹性薄壳理论和Couchaux改进梁理论构造了法兰盘与柱壳的变形协调机制,建立此连接结构的理论模型。经与有限元模型对比,此理论模型能正确预测螺栓法兰连接结构分离阶段初始刚度及表征分离阶段的刚度非线性变化。在此模型基础上,进一步研究了螺栓预紧力、装配位置、法兰盘厚度等参数对螺栓法兰连接结构分离条件、分离行为及分离阶段非线性刚度的影响,获得了分离临界载荷随设计参数的变化趋势。

关键词: 非线性刚度, 螺栓法兰连接, 柱壳结构, 结构分离, 临界载荷

Abstract: In the cylindrical shell connection structure assembled with bolted flange, the axial load is borne by the shell for compression, but by the bolted flange assembly for tension. When the tensile load is greater than the critical value, the existence of zero contact pressure region between flanges leads to local separation and loss of connection stiffness. which means the axial stiffness is nonlinear. To reveal the influence of structural parameters on the nonlinear stiffness under the preload, the theoretical model of bolted flange connection structure is established by constructing the deformation coordination mechanism of flange and cylindrical shell, based on the elastic thin shell theory and Couchaux improved beam theory. Compared with the finite element model, the theoretical model can correctly predict the initial stiffness and the change of the nonlinear stiffness in the separation stage of the bolted flange connection. By using the theoretical model, the influence of design parameters such as bolt preload, assembly position and flange thickness on the separation condition, separation behavior and nonlinear stiffness in separation stage of bolted flange connection structure is further studied. The variation trend of the separation critical load with the design parameters is obtained.

Key words: nonlinear stiffness, bolted flange connection, column shell structure, structural separation, critical load

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