Development and Application of On-site X-ray Stress Measurement Device Contributing to Safety in Railway Technology

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This research aimed at realization of a safe railroad. Since simultaneously with the information on a crystalline lattice, X-ray diffraction method can also enables us to evaluate residual stress, this research paid its attention to the X-ray diffraction method. The purpose of this research is to develop newly the compact apparatus for determining residual stress which can be used on-site. The other purposeof this research is to investe the actual condition of the damage in rails in service.As a result, it was found that the Debye ring from a rail was measurable in about 2 minutes by back reflection. It was also found that it became possible to observe visually a part of texture structure state developed in a rail by a plastic flow. Simultaneously, evaluation of residual stress was obtained from the Debye ring too.