Axial Stress Measurement of Long Welded Rails Using Acoustoelasticity

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  • TODA Hiroki
    Wakayama University, Dept of Opt-Mechatronics, Faculty of Systems Engineering
  • KODAMA Takamori
    School of Engineering Science, Osaka University
  • MURATA Yorinobu
    Wakayama University, Dept of Opt-Mechatronics, Faculty of Systems Engineering

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Other Title
  • 音弾性によるロングレールの軸応力測定
  • 音弾性によるロングレールの軸応力測定(第2報)改良形装置による新敷設レールの軸応力の経月変化測定
  • オンダンセイ ニ ヨル ロング レール ノ ジク オウリョク ソクテイ ダイ2ホウ カイリョウケイ ソウチ ニ ヨル シン フセツ レール ノ ジク オウリョク ノ ケイゲツ ヘンカ ソクテイ
  • －第２報　改良形装置による新敷設レールの軸応力の経月変化測定－
  • — The 2<SUP>nd</SUP> Report : Measurement of Monthly Variation of Axial Stress in a Newly Constructed Rail Using Advanced Equipment —

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This paper is the second report on axial stress measurements of a long welded rail making use of an acoustoelasticity effect of V-reflection longitudinal waves. The cause of accuracy deterioration in the field measurement, which was a problem in the previous report, was investigated and a newly improved axial stress measurement system was developed. Axial stresses of long welded rails which were constructed in winter or in summer seasons were measured using the new system. The monthly variation of the axial stress distribution in each rail was investigated for three months. As a result, the non-destructive measurement of the rail axial stress, within a measurement error of 5 MPa in the field measurement, was achieved. It was confirmed that the long welded rails which were constructed in both seasons are now being firmly fixed by both tie and ballast in the immobility section. Furthermore, it was clearly shown that the longitudinal resistance of the ballast in the movable section is about 1/3 of that commonly believed, and that the length of the movable section is gradually extended for several months after construction.

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