混合モードにおける平板貫通き裂の進展下限界 : 応力比および負荷形式の影響

概要

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In order to exmaine the effect of stress ratio and the difference in loading type on the frictional force acting on a crack surface, fatigue tests under mixed mode are carried out. Namely, a plate specimen made of SK-5 carbon steel with a center through crack at a 90° angle to the specimen axis is used for combination tests of plane bending and cyclic torsion with various stress ratios and that at 52°, 57° and 63° angle is used for plane bending tests. The warping of the plate by torsion is one of the main factors responsible for the frictional force under mixed mode and the warping at the threshold of crack propagation becomes remarked with the decrease of plate thickness. Thus, the difference between the threshold stress obtained and that calculated using the strain energy density criterion increases with the decrease in plate thickness. On the other hand, the increase in stress ratio cancels the effect of frictional force.
一般社団法人日本機械学会の論文
1993-07-25