微小試験片による疲労寿命評価技術の開発
Development of Fatigue Life Evaluation Technique using Miniature Specimen
著者:
野上 修平 Shuhei NOGAMI 西村 新 Arata NISHIMURA 藤原 昌晴 Masaharu FUJIWARA 日坂 知明 Tomoaki HISAKA
発刊日:
公開日:
ExtensometerFatigue lifeMicro-crackMiniature specimenSize effectStress concentration
概要
To develop the fatigue life evaluation technique using miniature specimen, the investigation of the effect of specimen size and specimen shape on the fatigue life and the development of the fatigue testin g machine, especially the extensometer, were carried out. The effect of specimen size on the fatigue life was almost negligible for the round-bar specimens. The shorter fatigue life at relatively low str ain range conditions for the hourglass specimen than the standard specimen were observed. Therefore the miniature round-bar specimen was considered to be adequate for the fatigue life evaluation using sma ll specimen. Several types of the extensometer system using a strain gauge and a laser has been developed for realizing the fatigue test of the miniature round-bar specimen at high temperature in vacuum.
