@article{oai:u-ryukyu.repo.nii.ac.jp:02000792,
 author = {真壁, 朝敏 and 兼城, 英夫 and 糸数, 真哉 and 屋富祖, 建樹 and Makabe, Chobin and Kaneshiro, Hideo and Itokazu, Masaya and Yafuso, Tateki},
 issue = {526},
 journal = {日本機械学会論文集. A編, Transactions of the Japan Society of Mechanical Engineers. A},
 month = {Jun},
 note = {Effective stress intensity factor range ΔK_<eff> and the J integral range ΔJ which are determined by the crack tip opening or closing point are considered as the likely parameters controling crack propagation behavior. Therefore, a development of the simple measurement method of crack tip opening and closing is considered to be important for the evaluation of crack propagation. In this study, for an elastic-plastic condition in a center-cracked plate, it is proposed that the crack tip opening and closing point can be simply determined with the σ-(ε_y-α)/(ε_x+α) diagram and σ-ε_y diagram, where σ is the cyclic stress, ε_y and ε_x are the strains measured in the vicinity of the crack center by means of a strain gauge and a is a constant value. Then this measurement method is compared with results obtained by finite element method calculations., 論文},
 pages = {36--41},
 title = {ひずみゲージを用いた疲労き裂開閉口点の測定法について},
 volume = {56},
 year = {1990}
}