| 研究実績の概要 |
Fatigue damage is known as one of the major concerns in maintaining the integrity of large-scale engineering components. The nonlinear strain/stress distribution around a fatigue crack tip has a great impact to understand the fatigue and crack growth behavior of engineering component. This research is devoted to develop the fatigue evaluation technique by a combination of two neutron methods: Bragg-edge transmission imaging and diffraction.Two-dimensional maps of inhomogeneous residual strain and microstructure for the compact-tension samples, which had been under different fatigue loading conditions, were determined by Bragg-edge spectral analysis. The obtained Bragg-edge imaging results were quantitatively compared with those determined by diffraction. Surface strains by digital image correlation during the fatigue tests were also measured.
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