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Thermal Cracking of a Railway Wheel Tread due to Tread Braking – Critical Crack Sizes

Sara Caprioli (Institutionen för tillämpad mekanik, Dynamik) ; Tore Vernersson (Institutionen för tillämpad mekanik, Dynamik) ; Anders Ekberg (Institutionen för tillämpad mekanik, Dynamik)
Proceedings 2011 International Heavy Haul Association Conference p. 8. (2011)
[Konferensbidrag, övrigt]

A numerical study of tread cracking due to thermal loading induced by tread braking is carried out. The analysis features a computationally efficient approach combining 2D FE-simulations with an analytical evaluation of resulting stress intensity factors. The analysis identifies critical sizes for when existing surface cracks are prone to propagate under thermal loading and resulting crack lengths after propagation. The results imply that fully functional brake systems are not likely to induce thermal crack propagation under normal stop braking, but that with pre-existing defects a severe drag braking due to malfunctioning brakes may cause very deep cracking. Further the analysis concludes the cracking to be a static phenomenon related to the most severe brake cycle, i.e. later brake cycles of similar or lower severity will not cause any significant propagation of existing cracks. Preliminary 3D FE-simulations that have been performed indicate the presented results to be conservative.

Nyckelord: railway tread braking, thermal cracking, critical crack sizes



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Denna post skapades 2012-01-18. Senast ändrad 2014-09-17.
CPL Pubid: 153584

 

Institutioner (Chalmers)

Institutionen för tillämpad mekanik, Dynamik

Ämnesområden

Transport
Teknisk mekanik

Chalmers infrastruktur