A New Method of Determining the Stress Intensity Factor From Isochromatic Fringe Loops.

Abstract

This paper describes a new four parameter method of analysis: :for determining of the stress intensity factor (SIF). The • method bypasses the error-prone measurements on the isochromatic pattern near to the crack tip and uses data from the • :near of the crack tip as well as extended stress field. 'Suitable expression was developed for the determination of • the fourth parameter based on isochromatic fringe loop information. Results were obtained by the computer program :(EGYPT)for different values of the parameters)3 and C4 to 'give the best accuracy of determining the stress intensity factor (K). The results obtained for Dobeckote-505 show good agreement with the analytical results.

A Simple Method for Determination of the Fracture-Mechanics Geometric Parameter Ki

“…Using the values of0(and )9 and fringe loop (locus of constant crack tip ("bTmajc ibe = 0), the from Eqn. (9).…”