2022-12-04T22:11:20Zhttps://nagoya.repo.nii.ac.jp/oaioai:nagoya.repo.nii.ac.jp:000074502022-10-21T01:21:40Z繰返しねじり・引張複合荷重下での予き裂からの疲労き裂進展経路の予測Prediction of Fatigue Crack Propagation Path from a Pre-Crack under Combined Torsional and Axial Loading田中, 啓介TANAKA, Keisuke秋庭, 義明AKINIWA, Yoshiaki加藤, 拓也KATO, Takuya高橋, 弘樹TAKAHASHI, Hirokiopen access日本機械学会本文データは学協会の許諾に基づきCiNiiから複製したものである。FatigueCrack PropagationCombined StressFracture MechanicsCrack Propagation PathCrack Face ContactBody Force MethodFatigue tests of crack propagation from a pre-crack in thin-walled tubular specimens made of a medium-carbon steel were performed under cyclic torsion with and without superposed static or cyclic axial loading. The stress ratio of cyclic loading was -1. The experimental path of fatigue crack propagation from a pre-crack was compared with the predictions based on the maximum tangential stress criterion. The direction of fatigue crack propagation was perpendicular to the direction of the maximum of the range of the tangential stress, Δσθmax, near the crack tip determined from the stress intensity factor which was calculated by considering the contacts of crack faces at the minimum load. The stress intensity factor calculated from the actual crack path by using the body force method showed that the mode Ⅱ stress intensity factor range quickly got close to zero after a small amount of crack extension. In other words, fatigue cracks propagate to satisfy the local symmetry of the cyclic components of crack-tip deformation.日本機械学会2005-04jpnjournal articleVoRhttp://hdl.handle.net/2237/9131https://nagoya.repo.nii.ac.jp/records/7450http://ci.nii.ac.jp/naid/110004998985/0387-5008日本機械学會論文集 A編71704607614https://nagoya.repo.nii.ac.jp/record/7450/files/JsMecEngA_71-704-607.pdfapplication/pdf830.6 kB2018-02-19