Crack initiation at V-notch tip subjected to in-plane mixed mode loading: An application of the fictitious notch rounding concept

摘要

The fictitious notch rounding concept is applied for the first time to V-notches with root holesubjected to in-plane mixed mode loading. Out-of-bisector crack propagation is taken into account. Thefictitious notch radius is determined as a function of the real notch radius?? the microstructural support lengthand the notch opening angle. Due to the complexity of the problem, a method based on the simple normalstress failure criterion has been used. It is combined with the maximum tangential stress criterion to determinethe crack propagation angle. An analytical method based on Neuber's procedure has been developed. Themethod provides the values of the microstructural support factor as a function of the mode ratio and the notchopening angle. The support factor is considered to be independent of the microstructural support length.Finally, for comparison, the support factor is determined on a purely numerical basis by iterative analysis of FEmodels.