RAIL AXIAL FORCE MEASURING METHOD AND RAIL WHOSE AXIAL FORCE CAN BE MEASURED

摘要

A rail axial force measuring method which removes the influence by a residual stress existing in a rail and measures an axial force borne by the rail quickly and accurately and a rail whose axial force can be measured. The rail axial force measuring method provided comprises the steps of imparting a stress sensing portion to the rail, exciting the stress sensing portion with an excitation head, detecting a change in magnetization of the stress sensing portion as a voltage signal with a detecting head, and measuring a rail axial force from the voltage signal. The voltage signal is a Barkhausen noise signal, and furthermore a configuration is also adopted in which the stress sensing portion locally heats up the rail to a gamma phase area, and thereafter it is heat treated at a temperature lower than that of the gamma phase area so that cementite is separated out. Furthermore, the present invention provides a rail having the stress sensing portion and whose axial force can be measured.