Yeah, that's likely a lower press tonnage than designed, and this one looks pretty bad. You might find out where the wheelset was assembled, and request the press fit curves from them, if they even have them. Compare this to whatever standard or local regulations state govern wheelsets for this use (freight, passenger, light rail, etc.) and see if it is different and by how much. See if a lubricant or anti-galling agent was applied to the surfaces, which might be allowed or disallowed.
Also, dimensional measurements of the wheels and axles will make sure there wasn't something missing in the machining process. You could also check whether these were repurposed or original wheels and axles. Lastly, looking for signs of fretting, galling, and even cracking on the contacting (faying) surfaces. Good luck!
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Erik Mueller
Materials Research Engineer
National Transportation Safety Board
Washington DC
(202) 591-6359
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Original Message:
Sent: 01-20-2023 08:56
From: Giancarlo Sanchez Chavez
Subject: Failure analysis on train wheel-axis
A case of failure analysis about the disengaged from a train wheel-axle, in the figure 1 the wheel moved from left to right. Figure 2 is other case of disengaged from a train wheel-axle, theses disengaged occurred when the train was running. Why does a wheel begin to disengage from the axle of a train? What are the probable causes?
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Giancarlo Sanchez Chavez
UNSA
Miraflores
947822222
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