音弾性によるロングレールの軸応力測定　―第１報　Ｖ反射縦波の音弾性特性―

概要

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In a long welded rail (continuous welded rail) of a railroad, axial stresses are created by the thermal expansion of rail material. Excessive axial stresses can result in track buckling and can significantly affect track safety. In this paper, we propose a nondestructive rail axial stress measurement system by making use of the acoustoelasticity of V-reflection longitudinal ultrasonic waves. The acoustoelastic characteristics of this ultrasonic wave were investigated at various temperatures. By applying this new technique to field measurement, the validity of measurement of axial stresses of rail was demonstrated.
一般社団法人日本非破壊検査協会の論文