华南理工大学学报(自然科学版) ›› 2012, Vol. 40 ›› Issue (4): 162-168.

• 力学 • 上一篇    

CFL 加固受弯钢板中表面裂纹应力强度因子的数值分析

张术宽1,2 黄培彦1,3† 赵传宇1   

  1. 1.华南理工大学 土木与交通学院,广东 广州 510640; 2.广州市特种承压设备检测研究院,广东 广州 510100; 3.华南理工大学 亚热带建筑科学国家重点实验室,广东 广州 510640
  • 收稿日期:2011-10-22 修回日期:2012-01-04 出版日期:2012-04-25 发布日期:2012-03-01
  • 通信作者: 黄培彦(1952-) ,男,教授,博士生导师,主要从事疲劳与断裂力学、桥梁结构耐久性研究. E-mail:pyhuang@scut.edu.cn E-mail:zskshine@163.com
  • 作者简介:张术宽(1971-) ,男,博士生,高级工程师,主要从事疲劳与断裂力学、桥梁力学研究.
  • 基金资助:

    国家自然科学基金重点资助项目( 51078145, 11132004) ; 广东省自然科学基金重点资助项目( 9251064101000016) ;广州市科信局资助项目( 2007Z3-D0121)

Numerical Analysis of Stress Intensity Factor of Surface Crack in Steel Plate Strengthened with CFL Under Bending Load

Zhang Shu-kuan1,2  Huang Pei-yan1,3  Zhao Chuan-yu1   

  1. 1.School of Civil Engineering and Transportation,South China University of Technology,Guangzhou 510640,Guangdong,China; 2.Guangzhou Special Pressure Equipment Inspection and Research Institute,Guangzhou 510100,Guangdong,China; 3.State Key Laboratory of Subtropical Building Science,South China University of Technology,Guangzhou 510640,Guangdong,China
  • Received:2011-10-22 Revised:2012-01-04 Online:2012-04-25 Published:2012-03-01
  • Contact: 黄培彦(1952-) ,男,教授,博士生导师,主要从事疲劳与断裂力学、桥梁结构耐久性研究. E-mail:pyhuang@scut.edu.cn E-mail:zskshine@163.com
  • About author:张术宽(1971-) ,男,博士生,高级工程师,主要从事疲劳与断裂力学、桥梁力学研究.
  • Supported by:

    国家自然科学基金重点资助项目( 51078145, 11132004) ; 广东省自然科学基金重点资助项目( 9251064101000016) ;广州市科信局资助项目( 2007Z3-D0121)

摘要: 借助ANSYS 建立了碳纤维薄板( CFL) 加固钢板中半椭圆型三维表面裂纹的应力强度因子有限元计算模型,讨论了CFL 厚度、裂纹形状比、裂纹面积对CFL 加固受弯钢板中三维表面裂纹应力强度因子的影响. 研究结果表明: CFL 加固含裂纹的钢结构能够大幅度地降低裂纹的应力强度因子; 应力强度因子的降低速率随CFL 厚度的增加而减小;裂纹面积越大的表面裂纹,在CFL 加固后其应力强度因子降低的幅度越大,加固效果越明显; 对于含细长裂纹的受弯钢板,CFL 正面加固的效果更为显著.

关键词: 碳纤维薄板, 钢结构, 表面裂纹, 应力强度因子, 有限元

Abstract:

With the help of ANSYS,a finite element model is proposed to calculate the stress intensity factor ( SIF) of semi-elliptical 3D surface crack in the steel plate strengthened with carbon fiber laminate ( CFL) . Then,based on this model,the effects of CFL thickness,crack shape ratio and crack area on the SIF are analyzed for the strengthened steel plate under bending load. The results show that ( 1) CFL strengthening greatly decreases the SIF of surface crack in the steel structure,with a rate reducing with the increase in CFL thickness; ( 2) larger surface crack is more helpful in decreasing the SIF and enhancing the strengthening; and ( 3) for the steel plate with shallow and long cracks,a front strengthening with CFL may work even better.

Key words: carbon fiber laminate, steel structure, surface crack, stress intensity factor, finite element

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