The Dynamic Bending of The Drilling Rod

Abstract

The Dynamic bending stress or moment of an initially curved elastic bar subjected to an axial impact by a rigid mass is calculated approximately and the result is applied to a rod of rock drill. It may be said that the rod of rock drill receives small bending stresses due to initial curvature, compared with the longitudinal one, but the stress due to the eccentric blow is rather large and comparable with the longitudinal one.