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 sleel 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.%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.
展开▼
