where expertise comes together - since 1996

Web's Largest Portal of Nondestructive Testing (NDT)
Open Access Database (Conference Proceedings, Articles, News), Exhibition, Forum, Network


NDT.net Issue - 2014-09 - NEWS

Detecting residual stresses on freight train wheels


Fraunhofer-Institute for Non-Destructive Testing (IZFP)440, Saarbrücken [Germany]
NEWS  
NDT.net Journal
Issue: 2014-09
From 23 to 26 September 2014, Fraunhofer IZFP engineers present a new and enhanced generation of test equipment for rapid and reliable determination of residual stresses in rims at InnoTrans in Berlin, (hall 23B, booth 206).

In the case of a car, the braking operation is carried out in seconds – jamming on the brakes and shortly afterwards the vehicle has stopped. But with a fully loaded freight train weighing lots of tons braking takes much longer – on long descents braking, which is required to prevent the train’s unwanted acceleration, can even take more than 30 minutes. For the wheels and brakes this long braking time means hard work – such a strong mechanical loading and heating of the wheels may cause so-called tensile residual stresses, which can lead to cracks in the wheel tread and – worst case – to wheel breakage. Geislinger Steige and Tauernbahn are best examples for routes that cause heavy endurance stress in wheels. Their strong inclinations and partly narrow radii require the permanent use of the wagons´ block brakes which generate the braking force by pressing the brake shoes against the tread of the wheels.

Photo: Determination of residual stresses in freight train wheels © Uwe Bellhäuser

More of Fraunhofer-Institute for Non-Destructive Testing (IZFP) published in NDT.net
2018-08-01: Numerical study of resonant frequencies in multi-material microstructures excited by ultrasonic vibrations
2018-08-01: Using Appropriate Models and Synthetic Data to Study the Properties of TFM Ultrasonic Imaging
2018-08-01: A Comparison of Three Approaches for the Inversion of Ultrasonic Rayleigh Wave Data into Residual Stress Profiles
2018-08-01: Combination of both Ultrasound and 3MA NDT technique for mechanical parameters calibration on heavy plates
2018-08-01: Local electromagnetic investigations on electrical steel FeSi 3% via 3MA micromagnetic NDT system
2018-08-01: Image Based Surface Microgeometry Modeling for Complex Surfaces
2018-08-01: An Approach to the Question ?how To Account For Human Error In Mapod??
2018-07-01: Betoflux – Stand der Technik in der Spannstahlbruchortung
2018-05-01: Prüfung von Eisenbahnrädern und -schienen mit Induktionsthermographie
2018-05-01: Effekte der Anisotropie in kohlenstofffaserverstärkten Kunststoffen bei der Induktionsthermografie
All 423 Articles & News of Fraunhofer-Institute for Non-Destructive Testing (IZFP) in NDT.net


© NDT.net - The Web's Largest Portal of Nondestructive Testing (NDT) ISSN 1435-4934

Open Access Database, |Conference Proceedings| |Articles| |News| |Exhibition| |Forum| |Professional Network|