000021503 001__ 21503
000021503 005__ 20170622131249.0
000021503 04107 $$aeng
000021503 046__ $$k2017-06-15
000021503 100__ $$aTournay, Harry
000021503 24500 $$aTHE EFFECT OF HIGH IMPACT WHEELS ON RAIL FAILURE

000021503 24630 $$n6.$$pComputational Methods in Structural Dynamics and Earhquake Engineering
000021503 260__ $$bNational Technical University of Athens, 2017
000021503 506__ $$arestricted
000021503 520__ $$2eng$$aRail is subject to repeated load cycles and wear. These load cycles can induce fatigue and rail failure. As rail failure is less predictable, wear is the desirable failure mode and factors influencing rail failure are carefully managed by railroads. In North America, static wheel loads are limited to a nominal maximum of 159 KN; however, wheel treads can develop rolling contact fatigue resulting in so-called high impact wheels (HIW) that, before removal, can introduce high impact loads on the rail in excess of 700 KN. Transportation Technology Center Inc. (TTCI) was tasked by the Association of American Railroads (AAR) to determine the effect of HIW on rail failure and ascertain whether more stringent removal criteria should be applied. TTCI conducted extended high frequency strain measurements at a WILD site and related the measured strains to the dynamic impact loads by the WILD site. These measurements supported analytical models developed to simulate defect growth and rail failure. Results of the analysis suggest that HIW have a minimal effect on rail failure because of:  High attenuation of the bending wave under impact due to the high damping in the track.  The low probability of repeated HIW cycles on specific elements within the rail. This paper describes the measurement and analysis process as well as the development of the models and the interpretation of resulting data and conclusions drawn.

000021503 540__ $$aText je chráněný podle autorského zákona č. 121/2000 Sb.
000021503 653__ $$aRail, Fracture, Failure, High Impact Wheels, Wheel Loads, Thermal Stress, Residual Stress, Reverse Bending, Indirect Loading, Head Defects, Transverse Defects, Base Defects, Fracture Mechanics, Wheel Impact Load Detectors, Track Modulus, Track Damping, Ties, Wheels.

000021503 7112_ $$aCOMPDYN 2017 - 6th International Thematic Conference$$cRhodes Island (GR)$$d2017-06-15 / 2017-06-17$$gCOMPDYN2017
000021503 720__ $$aTournay, Harry$$iKalay, Semih
000021503 8560_ $$ffischerc@itam.cas.cz
000021503 8564_ $$s2381941$$uhttps://invenio.itam.cas.cz/record/21503/files/16725.pdf$$yOriginal version of the author's contribution as presented on CD, section: [MS32] Extreme Dynamics
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000021503 962__ $$r21500
000021503 980__ $$aPAPER