The fatigue wear values for the drill rods of fully hydraulic portable rock core drilling machines are determined as follows:
The tensile load borne by the drill pipe at the bending point; The severity of borehole bending; The number of repeated forces on each drill pipe at the bending point of the borehole; Drill pipe size and steel performance. Due to the additional tension on the drill pipe being the key to fatigue wear, the bending of the upper drilling hole in deep wells often becomes a factor in fatigue wear.
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