水素による遅れ破壊におよぼす負荷様式の影響

概要

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Delayed fracture due to hydrogen is well known to occur very easily in notched specimen under tensile loading (fracture mode I) but the behavior under another loading(fracture mode Ⅱ,Ⅲ) is not known. The most convenient mode Ⅲ (shear) loading arrangement is the torsion of round bars. Then, we confined the present study to mode I and Ⅲ tests and discussed about the effect of loading mode on delayed fracture due to hydrogen. The results are summarized as follow; (1) Delayed fracture occurs also under shear loading, but fracture sensibility was lower than that under tensile loading. (2) In the case of as-received material of HT80 steel, the effect of notch was not occurred and the fracture of all of specimen was shear type. (3) In the case of heat treated material (1300℃ × 1hr.→W.Q.) of same steel, delayed fracture strength of notched specimen becomes stronger than that of plane specimen. Fracture of plane specimens was tensile type, and it is similar to the another brittle material.
津山工業高等専門学校の論文
1984-10-20