金属の破断について(第3報) : 組合せ応力によるねずみ鋳鉄の破断

概要

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Fracture tests on thin-walled-tubes of gray cast irons were carried out under tension and torsion combined. From the latest paper concerning the deformation behaviors, the Fisher's hypothesis was approved as reasonable. In the present paper, only the fracture behaviors are discussed by taking this notch effect into account and applying the fracture criterion at the tips of graphite flakes. The fracture stresses decrease with increasing the amount of torsion in comparison with those predicted by the maximum tensile stress theory. These experimental evidences can be accounted for by considering the additional stress in tensile direction at the tip of notch and the weakening effect of material strength due to polyaxiality. In order to compare with other proposed criteria, the fracture results under other kinds of polyaxial stresses by other reseach workers are cited and are all well explained consistently with our concept.
一般社団法人日本機械学会の論文
1958-07-25