板条粘补止裂技术的理论分析

 对采用板条局部加强含裂纹构件止裂技术从理论上进行了深入的分析研究。着重考察了板条在跨过裂纹以任意非对称方式进行局部加强时,其中所含有的应力奇异性问题。最后获得了可用来评估板条止裂效率的裂尖应力强度因子,以及板条端部和板条与构件粘结界点处的应力强度因子。

THEORETICAL ANALYSIS FOR RETARDING CRACK GROWTH BY ADHESIVELY BONDING STRIPS

analysis model for adhesively bonding a strip to a cracked plate is first presented. Then,based on this model,a singular integral equations method is developed,in which Green's functions for a pair of edge dislocations and for a concentrated body force are used for the formulation of the problem. Using this method,the stress intensity factors not only at the crack tips,but also at the bonding limit points or debonding fronts and at the ends of the strip,are ob- tained.Finally,some numerical results are given to show the effects of the shear modulus ratio of the strip to the plate,of the size of the strip and of the manner of bonding,on the efficiency of re- tarding the crack growth.