Rail axial-force measuring method and an axial-force measurable rail
US5654511A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 30, 1995 |
| Grant date | Aug 5, 1997 |
| Priority date | — |
| Expiry date | Nov 30, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01L1/125
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A rail axial-force measuring method and an axial-force measurable rail which eliminate the effects of residual stresses existing in a rail and thus enables an axial force acting on the rail to be measured quickly and accurately are provided. The rail is provided with a stress sensing portion which is magnetized by a magnetizing head, and changes in the magnetization of the stress sensing portion are detected by a detection head as a voltage signal from which an axial force acting on the rail is measured. Preferably, the voltage signal is a Barkhausen noise signal and, also preferably, the stress sensing portion is constructed from a portion formed by first locally heating the rail into a .gamma.-phase region, and then causing cementite to precipitate by heat treatment at a temperature lower than the .gamma.-phase region. The axial-force measurable rail including the above-described stress sensing portion is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.