人工きず入り新幹線電車車軸の疲労試験結果に対する破壊力学的評価 : 第2報, 中ぐり車軸の場合

概要

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Fatigue tests of full-scale axles with flaws on the wheelseats were performed up to the cycle of 10^8. Shinkansen vehicle axles, which had a straight bore of 60mm in diameter or a bore of 60mm at both journal parts and 110mm between two wheelseats for the purpose of testing, had been induction-hardened almost over their entire length. The result of fatigue tests was evaluated from the calculated stress intensity factor by regarding the flaw as a crack, whose depth was estimated by adding the compressive yielded zone size to the depth of the flaw. The crack at the tip of a flaw which originated a fatigue fracture was divided into two regions. The measured size of the region adjacent to the flaw was nearly equal to the calculated compressive yielded zone size. On the other hand, the crack length at the tip of a flaw which did not cause a fatigue fracture was almost 30% of the calculated compressive yielded zone size.
一般社団法人日本機械学会の論文
1996-11-25