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Civil-Comp Proceedings
ISSN 1759-3433
CCP: 110
Edited by: J. Pombo
Paper 167

Fundamental Research of the Axial Force Evaluation of the Railway Rail with X-ray Stress Measurement

Y. Kanematsu and M. Matsui

Materials Technology Division, Railway Technical Research Institute, Tokyo, Japan

Full Bibliographic Reference for this paper
Y. Kanematsu, M. Matsui, "Fundamental Research of the Axial Force Evaluation of the Railway Rail with X-ray Stress Measurement", in J. Pombo, (Editor), "Proceedings of the Third International Conference on Railway Technology: Research, Development and Maintenance", Civil-Comp Press, Stirlingshire, UK, Paper 167, 2016. doi:10.4203/ccp.110.167
Keywords: railway rail, axial force, nondestructive inspection, X-ray stress measurement method, cos-alpha method, tensile testing machine, full-scale test.

The study, described in this paper, examines the application of X-rays to evaluate rail axial force. The X-ray stress method measures the strain of a crystalline material using a noncontact, nondestructive technique. When a load is applied to the material, the lattice spacing of the crystal changes and the spacing is measured by X-ray diffraction. A simple cos-alpha X-ray analysis, developed in Japan, measures the stress within tens of seconds and can be used to make measurements in the field. A laboratory tensile testing machine measured the stress on an actual rail. This value was compared with that obtained by the X-ray stress measurements. The X-ray apparatus combined with the cos-alpha method was shown to measure the rail axial force in rails accurately.

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