Title:
STRESS MEASURING METHOD UTILIZING MAGNETIC DISTORTION EFFECT AND DEVICE THEREOF
Document Type and Number:
Japanese Patent JP3204073
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a stress measuring method utilizing the magnetic distortion effect and a device thereof.
SOLUTION: In a stress measuring method utilizing a magnetic distortion sensor, U-shaped yokes, which are respectively formed by winding an exciting coil and a detecting coil, are made to cross each other at a central part of a yoke saddle part, and a yoke opening end side is made to come close to the material to be measured so as to excite the material to be measured, and a lord stress of the material to be measured is obtained on the basis of the electromotive force induced by the detecting coil. In this method, output waveform of the electromotive force to be induced by the detecting coil is expressed with a formula V=A+B.COS[2.(θ-C)]. In the formula. V means electromotive force to be induced by the detecting coil. θ means an angle formed by a strength line for connecting opening ends of yoke wound with the detecting coil and the maximum main stress direction. A, B, C means parameter. In this stage, the parameter A is obtained, and the stress for correcting the sensitivity on the basis of the relation between the obtained parameter A and a distance between the magnetic distortion sensor and the material to be measured and the relation between the lift-off and sensitivity to the stress is measured.
Inventors:
Sakai Yoshiaki
Application Number:
JP6271896A
Publication Date:
September 04, 2001
Filing Date:
March 19, 1996
Export Citation:
Assignee:
Nippon Steel Tube Co., Ltd.
International Classes:
G01L1/00; G01L1/12; (IPC1-7): G01L1/00; G01L1/12
Domestic Patent References:
| JP5231960A | ||||
| JP1137440A | ||||
| JP429848U |
Attorney, Agent or Firm:
Shigeru Takano