Stress Intensity Factor Equations for a Corner Crack Located at an Open Hole and Subjected to Different Crack Surface Pressure Distributions

摘要

A stress intensity factor equation for a single corner crack at an open hole, subjected to four different crack surface pressure distributions was developed. An equation for the same geometry, a plate of finite dimensions with a circular hole, but loaded with a uniform, uniaxial stress was also developed. The equations take into account the finite dimensions of the plate and allow for an eccentrically located hole. The equations produce conservative estimates when compared to a finite element solution. Stress intensity factors for crack surface pressure distributions can be used to estimate other stress intensity factors by applying the principle of superposition and the stress distribution along the prospective crack path in the uncracked body. This technique was used to check the performance of the four stress intensity factor equations representing the different basic crack surface pressure distributions. The result shows that the third order polynomial stress distribution, which can be accomplished with the four basic solutions, is not sufficient if large crack length intervals have to be considered.