Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : November 23, 2018 - November 25, 2018
Hydrogen diffusion / Elastoplastic coupling analysis in a commercial finite element method (FEM) software Abaqus was developed for fatigue crack growth (FCG) tests for low-carbon steel JIS-SM490B in gaseous hydrogen. The FE analyses were performed under various combination of hydrogen gas pressure ranging from 0.1 to 90 MPa and frequency from 0.001 to 10 Hz. Based on the experimental and numerical results, two evaluation methods were proposed: one is for prediction of hydrogen-enhanced FCG acceleration onsets by using gradient of hydrogen concentration G obtained by FE analysis and critical gradient Gc near a crack tip, the other is for prediction of hydrogen-enhanced FCG acceleration ratio by using original parameter “effective diffusion depth Xh” based on the gradient of hydrogen concentration. Then, it was confirmed that the evaluation methods were effective of hydrogen-enhanced FCG acceleration onsets and ratio, respectively.
