DB TEMA, Copyright FIZ Technik.
AN W95096303 404; Update: 19950920.
MJ Eisenbahnschiene; Eigenspannung; Messgeraet; Vergleich.
TI Stress  measurement  in  railroad  rail using ultrasonic and magnetic
   techniques.
   Messung  der mechanischen Spannung in Eisenbahnschienen mit Hilfe von
   Ultraschall- und magnetischen Verfahren.
TC A Anwendungsspezifische Abhandlung.
AB The  nondestructive  measurement of stress is a continuing concern to
   the  railroad  industry. Severe web cracking tendencies in some rails
   have  been  linked  to  high  residual  stresses  created during rail
   production.  Rails are plastically deformed during the final stage of
   production,  known as roller-straightening. While most rails have the
   same  characteristic  stress  distribution  afforded by this process,
   safety  concerns  warrant  the  detection of pronounced stress levels
   that would lead to exaggerated cracking behavior. Two techniques were
   evaluated   in   this  study  for  their  ability  to  detect  stress
   distributions  along  a  particular rail. Previous efforts identified
   this  rail  as  having a pronounced longitudinal stress gradient. The
   instruments used to inspect for these stress characteristics were: an
   ultrasonic-based  device  developed by the Polish Academy of Sciences
   and  marketed  commercially  as the Debro-30 Ultrasonic Stress Meter,
   and a device developed by the Center for NDE at Iowa State University
   that  performs  magnetic  hysteresis  tests, known as the Magnescope.
   Result:  The  ultrasonic stress measurement technique embodied in the
   Debro-30  is  viewed as a useful tool for determining residual stress
   patterns  in railroad rail. The required calibration on a stress-free
   sample  of  the  same  material,  however,  is  viewed as potentially
   cumbersome  for  the measurement of axial stress of in-track rails of
   unknown  pedigree.  The  portable  magnetic  hysteresis technique for
   stress  measurement has undergone much development through industrial
   and  academic  collaboration.  New  levels  of  test  sensitivity and
   reproducibility  have  been  achieved through this research. However,
   the  real  surfaces  of  railroad  rails may not allow for widespread
   usage  of this technique. Either a direct calibration on a given test
   piece  will be requirement for stress measurement, or additional data
   interpretation techniques must be developed.
AU Utrata-D; Strom-A; Negley-M.
IN Association  of  American  Railroads, Chicago, USA; Iowa State Univ.,
   Ames, USA.
SO Konferenz-Einzelbericht:   Review   of   Progress   in   Quantitative
   Nondestructive Evaluation. Proceedings of the Twenty-First Symposium,
   Snowmass   Village,   USA,  31.7.-5.8.1994,  Band  14B  (1995)  Seite
   1683-1691  (9  Seiten,  8 Bilder, 3 Quellen), New York: Plenum Press,
   ISBN 0-306-45062-3.
LG EN English.
AV TIB-RO141(14,2).
   BAM-Z-0990/95.
CC 3IGX *zerstoerungsfreie Pruefung von Werkstoffen/Bauteilen*
   3IDA *akustische Messverfahren*
   3IDE *elektrische und magnetische Messverfahren*
   3IFM *Messung/Pruefung mechanischer/geometrischer Groessen*.
MN ZERSTOERUNGSFREIE-PRUEFUNG;  EIGENSPANNUNG; SCHIENE; EISENBAHNBEDARF;
   AKUSTISCHES-MESSEN;   MAGNETISCHES-MESSEN;   MESSGERAET;   VERGLEICH;
   MAGNETISIERUNGSKURVE;      KOERZITIVFELDSTAERKE;      VERFAHRENSWAHL;
   SCHALLGESCHWINDIGKEITSMESSUNG;       LAUFZEITMESSUNG;      EISENBAHN;
   AKUSTISCHES-MESSVERFAHREN;                MAGNETISCHES-MESSVERFAHREN;
   VERFAHRENSTECHNIK;       EISENBAHNSCHIENE;       ULTRASCHALLPRUEFUNG;
   SYSTEMVERGLEICH;    KOERZITIVE-FELDSTAERKE;    SCHALLGESCHWINDIGKEIT;
   MESSGROESSE; LAUFZEIT; spannungsbestimmung; remanente-magnetisierung.
YR 1995.
ED 199510.
PT CA Conference paper.
IR IN=Association-of-American-Railroads; IN=Iowa-State-Univ.