Experimentelle und rechnerisch validierte Methode zur Bestimmung der Mindesteinschraubtiefe von Schraubenverbindungen mit gefurchtem Mutterngewinde Experimental and computationally validated approach for determining the minimum length of thread engagement for bolted joints with formed female threads

Abstract

Beside the strength ratio of the material the length of thread engagement and the size of the pilot hole diameter determine the quasi-static strength of bolted joints with formed female threads. Pull-out tests with varied lengths of thread engagement and thread overlapping are carried out for different thread types and thread sizes to validate a new evaluation approach for the required minimum length of engagement. By means of a stress ratio of a perfectly formed thread and that of a thread to be evaluated the thread overlapping is taken into account in the design process.