Development of four-point bending fatigue test method using continuously hydrogen-charging pipe specimen

12th International Conference on Damage Assessment of Structures

Yoshimoto, T.^1 ; Matsuo, T.^2,3

Graduate School of Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka

814-0180, Japan^1

Department of Mechanical Engineering, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka

814-0180, Japan^2

Institute of Materials Science and Technology, Fukuoka University, 8-19-1 Nanakuma, Jonan-ku, Fukuoka

814-0180, Japan^3

关键词: Experimental methods;    Four point bending;    High cycle fatigue test;    High pressure gas;    High pressure hydrogen gas;    High-pressure vessel;    Internal circulations;    Long-term testing;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/842/1/012062/pdf
DOI  :  10.1088/1742-6596/842/1/012062

来源: IOP

【 摘 要 】

To evaluate hydrogen embrittlement, the following two types of testing method are available: (i) testing in high-pressure hydrogen gas environment and (ii) testing in ambient air using hydrogen precharged specimen. Testing in high-pressure hydrogen gas environment is technically difficult and expensive because high-pressure gas equipments, such as high-pressure vessel and pipe, have to be installed in the laboratory. On the other hand, in the case of precharging method, outgassing of hydrogen from the specimen occurs during the test. Therefore, hydrogen embrittlement can hardly be evaluated properly, especially, in long-term testing such as high cycle fatigue test at low frequency. In this study, to effectively evaluate the hydrogen embrittlement in fatigue, an experimental method, which was the four-point bending fatigue test system with a mechanism of internal circulation of hydrogen-charging solution in a pipe specimen, was developed. By using this method, the fatigue crack growth properties in the presence of hydrogen were investigated at frequencies of 0.05 Hz and 1 Hz.