2034 内部き裂進展を模擬するための超高真空疲労試験機の開発(S11-2 軸荷重下の超高サイクル疲労特性,S11 金属材料の超高サイクル疲労特性の解明)

概要

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Very High Cycle Fatigue (VHCF) is a very impor,tant problem for mechanical engineers. To investigate the VHCF, it is necessaly to know more details about interior crack growth and exposure environment of the crack. We developed an ultra high vacuum fatigue testing machine to simulate interior crack growth. Main goals of the development were as follows: 1) vacuum pressure up to about 10^<-8>[Pa], 2) to enable fatigue tests under various stress ratios (R<0, =0, >0), 3) to minimize a bending stress generated in a specimen. To accomplish these goals, we introduced a chamber which has mirror and electrochemical polished inner surface, a Turbo Molecular Pump (TMP) directly connected to the main chamber, an alignment adjuster, and a digital controller. As a result, this machine achieved the following performance: a) ultimate pressure of 4.6×10^<-7>[Pa] after baking treatment, b) precise adjusting ability in about 1[MPa] increments of the bending stress, c) high accuracy loading with less than ±0.2[%] errors.
2007-09-07