Numerical Analysis of Stress Intensity Factors of a Crack in the Composite Patch Repair

摘要

The composite patch repair technology can be utilized to provideupgrades, such as higher design requirements and life extensions.However, in this case, failures easily happen on the edge interfacebetween the substrate material and the restorative material, because ofthe incompatible of different properties. Failures such as flaws orcracks lying along the interface reduce the strength of the structuresignificantly. In this paper, the numerical solutions of hypersingularintegro-differential equations are discussed in the analysis of threedimensional interfacial cracks subjected to general internal pressure,and the problem is formulated on the basis of the body force method.The stress intensity factors are given with varying materialcombinations. It is found that the stress intensity factors and aredetermined by the bi-materials constant alone, independent of elasticmodulus ratio and Poisson's ratio.