SIST EN 17149-3:2025

Railway applications - Strength assessment of rail vehicle structures - Part 3: Fatigue strength assessment based on cumulative damage

This document describes a procedure for fatigue strength assessment based on cumulative damage of rail vehicle structures that are manufactured, operated and maintained in accordance with standards valid for rail system applications.
This document is applicable for variable amplitude load data with total number of cycles higher than 10 000 cycles.
An endurance limit approach is outside the scope of this document.
The assessment procedure is restricted to ferrous materials and aluminium.
This document does not define design load cases.
This document is not applicable for corrosive conditions or elevated temperature operation in the creep range.
This document is applicable to all kinds of rail vehicles; however it does not define in which cases a fatigue strength assessment using cumulative damage is to be applied.

Bahnanwendungen - Festigkeitsnachweis von Schienenfahrzeugstrukturen - Teil 3: Betriebsfestigkeitsnachweis

Dieses Dokument beschreibt ein Verfahren für den Betriebsfestigkeitsnachweis auf Grundlage von Schadensakkumulation von Schienenfahrzeugstrukturen, welche nach Normen für Bahnanwendungen hergestellt, betrieben und instandgehalten werden.
Dieses Dokument findet Anwendung bei Lastdaten mit variabler Amplitude für Zyklenzahlen über 10 000 Zyklen.
Dieses Dokument ist nicht anzuwenden für den Dauerfestigkeitsnachweis.
Das Nachweisverfahren beschränkt sich auf eisenhaltige Werkstoffe und Aluminium.
Dieses Dokument legt keine Bemessungslastfälle fest.
Dieses Dokument ist nicht anzuwenden für Korrosionszustände oder Betrieb bei erhöhter Temperatur im Kriechbereich.
Dieses Dokument ist für alle Arten von Schienenfahrzeugen anwendbar; es legt jedoch nicht fest, in welchen Fällen ein Betriebsfestigkeitsnachweis mittels Schadensakkumulation anzuwenden ist.

Applications ferroviaires - Évaluation de la résistance des structures de véhicule ferroviaire - Partie 3 : Évaluation de la résistance à la fatigue basée sur la méthode des dommages cumulés

Le présent document décrit une procédure d'évaluation de la limite de fatigue selon la méthode des dommages cumulés applicable aux structures de véhicules ferroviaires qui sont fabriquées, gérées et entretenues conformément aux normes valides pour les applications ferroviaires.
Le présent document est applicable pour des données de charge à amplitude variable avec un nombre total de cycles supérieur à 10 000 cycles.
La méthode d'endurance limite ne relève pas du domaine d'application du présent document.
La procédure d'évaluation se limite aux matériaux ferreux et à l'aluminium.
Le présent document ne définit pas de cas de charge de conception.
Le présent document ne s'applique pas en cas de conditions corrosives ou de conditions d'exploitation à une température élevée dans la plage de fluage.
Le présent document est applicable à tous les types de véhicules ferroviaires. Toutefois, il ne définit pas dans quels cas une évaluation de la limite de fatigue selon la méthode des dommages cumulés doit être réalisée.

Železniške naprave - Ocenjevanje odpornosti konstrukcije železniških vozil - 3. del: Ocena odpornosti proti utrujenosti na podlagi kumulativne škode

General Information

• Status: Published
• Public Enquiry End Date: 31-May-2023
• Publication Date: 06-Feb-2025
• ICS: 45.060.01 - Railway rolling stock in general
• Technical Committee: IŽNP - Reilway applications
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 05-Feb-2025
• Due Date: 12-Apr-2025
• Completion Date: 07-Feb-2025
• Ref Project: EN 17149-3:2025 - Railway applications - Strength assessment of rail vehicle structures - Part 3: Fatigue strength assessment based on cumulative damage

Standards Content (Sample)

SLOVENSKI STANDARD
01-marec-2025
Železniške naprave - Ocenjevanje odpornosti konstrukcije železniških vozil - 3.
del: Ocena odpornosti proti utrujenosti na podlagi kumulativne škode
Railway applications - Strength assessment of rail vehicle structures - Part 3: Fatigue
strength assessment based on cumulative damage
Bahnanwendungen - Festigkeitsnachweis von Schienenfahrzeugstrukturen - Teil 3:
Betriebsfestigkeitsnachweis
Applications ferroviaires - Évaluation de la résistance des structures de véhicule
ferroviaire - Partie 3 : Évaluation de la résistance à la fatigue basée sur la méthode des
dommages cumulés
Ta slovenski standard je istoveten z: EN 17149-3:2025
ICS:
45.060.01 Železniška vozila na splošno Railway rolling stock in
general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 17149-3
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2025
EUROPÄISCHE NORM
ICS 45.060.01
English Version
Railway applications - Strength assessment of rail vehicle
structures - Part 3: Fatigue strength assessment based on
cumulative damage
Applications ferroviaires - Évaluation de la résistance Bahnanwendungen - Festigkeitsnachweis von
des structures de véhicule ferroviaire - Partie 3 : Schienenfahrzeugstrukturen - Teil 3:
Évaluation de la résistance à la fatigue basée sur la Betriebsfestigkeitsnachweis
méthode des dommages cumulés
This European Standard was approved by CEN on 27 October 2024.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 17149-3:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 8
4 Stress determination . 8
4.1 General. 8
4.2 Parent material . 9
4.3 Welded joints . 9
4.3.1 Modified nominal stresses . 9
4.3.2 Structural stresses and notch stresses . 9
5 Fatigue strength . 9
5.1 Parent material . 9
5.1.1 General. 9
5.1.2 Component fatigue strength Δσ and Δτ . 10
R R
5.1.3 Material properties . 10
5.1.4 Design Parameters . 11
5.1.5 Fatigue strength factors for direct stresses f and for shear stresses f . 13
R,σ R,τ
5.1.6 Correction factor for casting f . 14
R,C
5.1.7 S-N curves and methods of cumulative damage rule . 15
5.2 Welded joints . 17
5.2.1 General. 17
5.2.2 Fatigue classes Δσ and Δτ . 17
C C
5.2.3 Component fatigue strength Δσ and Δτ . 18
R R
5.2.4 Influence of thickness f and bending . 18
thick
5.2.5 Residual stress factors f and f . 19
res,σ res,τ
5.2.6 Enhancement factor for post-weld improvement f . 19
post
5.2.7 Quality level factor f . 20
QL
5.2.8 Enhancement factor for the weld inspection class f . 21
CT
5.2.9 S-N curves and methods of cumulative damage rule . 21
5.3 Determination of the fatigue strength of parent material and welded joints by
laboratory tests . 23
6 Partial factors covering uncertainties . 24
6.1 General. 24
6.2 Partial factor for loads γ . 24
L
6.3 Partial factor for the component fatigue strength γ . 25
M
6.3.1 General. 25
6.3.2 Partial factor for the consequence of failure γ . 26
M,S
6.3.3 Partial factor for the inspection during maintenance γ . 26
M,I
6.3.4 Partial factor for the degree of the validation process γ . 27
M,V
7 Procedure of the fatigue strength assessment based on cumulative damage
calculation . 28
7.1 General . 28
7.2 Stress determination . 29
7.3 Determination of the design stress spectrum . 29
7.3.1 Conditioning . 29
7.3.2 Stress history adjustment . 29
7.3.3 Counting . 29
7.3.4 Mean stress adjustment . 30
7.3.5 Omission . 30
7.4 Damage calculation for each single stress component . 31
7.4.1 General . 31
7.4.2 Determination of stress spectrum shape factor A . 32
eq
7.4.3 Determination of admissible damage sum D . 32
m
7.4.4 Determination of the utilization for a single stress component U . 32
c
7.5 Assessment of fatigue strength . 34
7.6 Critical plane approach . 35
Annex A (informative) Procedure for determination of mean stress factors for parent
material and welded joints . 36
A.1 General . 36
A.2 Mean stress sensitivity . 36
A.2.1 Parent material . 36
A.2.2 Welded joints . 37
A.3 Determination of mean stress factors . 37
Annex B (informative) Specification example for permissible volumetric defects in steel,
iron and aluminium castings . 41
B.1 General . 41
Annex C (informative) Material factors for parent material . 42
Annex D (normative) Fatigue classes Δσ and Δτ for welded joints based on the nominal
C C
stress approach . 44
D.1 Explanation of the tables for fatigue classes . 44
D.1.1 General . 44
D.1.2 Number and marking in accordance with EN 15085-3:2022+A1:2023, Table B.1 . 44
D.1.3 Sketch of the joint . 44
D.1.4 Joint specific requirements . 45
D.1.5 Potential crack initiation point . 45
D.1.6 Feasibility for inspection . 45
D.1.7 Relevant thickness for the assessment of a welded joint . 45
D.1.8 Material . 45
D.1.9 Fatigue classes Δσ and Δτ . 46
C C
D.1.10 Exponent m and number of cycles at the knee point of the S-N curve N . 46
D
D.1.11 Thickness correction exponents n n and n .
...