scope:

The aim of this document is to define a design assessment procedure of a forged and rolled monobloc wheel. This assessment is carried out before the wheel is commissioned. This document describes, in particular, the assessment to be performed in order to use wheels on a European network which, in addition, have quality requirements in conformity with those defined in EN 13262:2020.

This assessment requires that the conditions of use for the wheel are defined and this document provides a method for defining those conditions.

The assessment of the design covers four aspects:

- a geometrical aspect: to allow interchangeability of different solutions for the same application;

- a thermomechanical aspect: to manage wheel deformations and to ensure that braking will not cause wheels to fracture;

- a mechanical aspect: to ensure that no fatigue cracks occur in the wheel web and that no permanent deformation occurs under exceptional loading;

- an acoustic aspect: to ensure that the solution chosen is as good as the reference wheel.

This document has been drawn up for wheels of non-powered tread-braked wheelsets and applies in full to this type of wheel. For wheels with mounted brake discs or gear unit couplings or wheels with noise dampers, the requirements can be amended or supplemented.

For urban railway vehicles, other standards or documents can be used.