Journal of South China University of Technology(Natural Science Edition) ›› 2012, Vol. 40 ›› Issue (4): 162-168.

• Mechanics • Previous Articles    

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)

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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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