Abstract
This paper deals with the experimental research on the effects of wire drawing conditions, mainly the shape of die wall and the amount of reduction of diameter in drawing on the fatigue strength of drawn wire.
We have investigated the endurance limit of 0.41% carbon steel wires drawn under several kinds of drawing conditions, using a Haigh-Robertson type fatigue testing machine.
Results obtained may be summerized as follows;
(1) The endurance limit of the wire drawn with a die of larger radius of curvature of drawing surface revealed higher than that of smaller radius.
(2) The endurance limit increased sharply with the increase of reduction of diameter in the range of low reduction, tending to a constant value when the reduction of diameter was more than 10%.
