ESTIMATION OF STRESS CONCENTRATION FACTOR AT STOP-HOLE WITH BOLTING A CRACK

Abstract

A drilling stop-hole is a tentative repair method for fatigue cracks. Some of the authors have proposed the method to reduce the stress concentration at stop-hole edge by bolting a crack. In the proposed method, reduction of crack opening displacement at bolted area contributed to reduction of stress concentration factor. In this study, to evaluate the fatigue strength reinforced by the proposed method, stress concentration factor at stop-hole is estimated based on the principle of superposition. Furthermore, a stress concentration factor at stop-hole reinforced by bolting a stop-hole and bolting a crack is evaluated. The validation of the estimated stress concentration factor at stop-hole reinforced by bolting a crack is confirmed by FE analysis.