QUALITY CONTROL OF RAILS WITH THE USE OF ELECTROMAGNETIC ACOUSTIC CONVERTERS

KONTROL' KACHESTVA REL'SOV S POMOSHCH'IU ELEKTROMAGNITNO- AKUSTICHESKIKH PREOBRAZOVATELEI

Due to problems (misalignment of the probe insufficient or excess contact liquid, accumulation of dirt on the running surface of the rail head, etc.) involved in ultrasonic rail inspection, which impair acoustical contact, thereby substantially lower the reliability of results, a contactless (electromagnetic-acoustic) means of excitation and registration of the ultrasonics is envisaged. This work investigates the reflecting shadow method of flaw detection with the utilization of integrated and divided induction coils of the electromagnetic acoustic converters (EMAC). With such a means of control it is possible to isolate two zones in the rail: the web and its continuation into the head and underside and lateral portions of the head. Checking of the first zone is most expediently realized by the EMAC, whose inductor ensures the excitation of the ultrasound oscillations distributed according to the standard of the ground surface. The indicated construction of the EMAC allows for the emission of predominantly transverse waves. The conclusions reached are: (1) For the successful revelation of defects in the web of the rail and its continuation into the head and the underside, the polarization plane of the transverse wave should be oriented normally to the plane in which the development of a defect is expected; (2) The utilization of a transverse wave polarized perpendicularly to the plane of development of the defect allows the exposure of defects not made apparent during inspection by longitudinal waves in the presence of the contact modification of the ultrasonic flux; (3) The proposed designs of the induction coils of the electromagnetic-acoustic converter and the arrangements for sounding of the rails allows the exposure of defects of vertical fissures and separations in the rail web, as well as inclined transverse fissures of fatigue, friable areas, and horizontal separations in the lateral portions of the rail head.

  • Availability:
  • Supplemental Notes:
    • Full translation available for reference purposes at the Office of R&D, FRA. Contact Technology Planning Officer.
  • Corporate Authors:

    Plenum Publishing Company

    227 West 17th Street
    New York, NY  United States  10011
  • Authors:
    • Boldyrev, Iu P
    • Petrov, Iu V
  • Publication Date: 1975

Language

  • Russian

Media Info

Subject/Index Terms

Filing Info

  • Accession Number: 00130270
  • Record Type: Publication
  • Source Agency: Federal Railroad Administration
  • Files: TRIS, USDOT
  • Created Date: Dec 1 1976 12:00AM