The paper shows a solution developed for stress testing by a non-contact EMAT probe embedding two superimposed sensors that generate shear ultrasonic waves with cross polarization, thus providing the required measures without probe rotation. The dedicated electronic hardware is suited to implement manual or automated test applications. The accurate and reliable measure of wave travel time enables residual stress evaluation accuracies up to 10 MPa in lab conditions. The system has been improved to meet increasingly requirements on test speed, flexibility, and error detection without operator intervention. A mechanical rig with a motorised actuator has been developed to ensure scan and stress tests in a portable set-up. Synchronisation to external manipulators allows in-shop wheels/wheelsets automated tests with existing mechanised systems. The paper will show the system proposed to exploit EMAT stress evaluation in the qualification of wheels operating in a mine district, for iron ore cars subject to load per axis exceeding 32 tons.
Non-destructive evaluation of residual stresses in railway solid wheels by non-contact EMAT probe
Zerstörungsfreie Bestimmung der Eigenspannung in Eisenbahnrädern mittels berührungslosen EMUS-Wandlern
2006
8 Seiten, 6 Bilder, 1 Tabelle, 9 Quellen
Aufsatz (Konferenz)
Datenträger
Englisch
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