prEN 17149

Railway Applications - Fatigue strength assessment of railway vehicle structures based on cumulative damage

The purpose of this European standard is to specify the procedure for fatigue strength assessment of railway vehicle structures based on cumulative damage.
This document is applicable to all rail vehicle structures, which are covered by EN 12663 series (car body) and EN 13749 (bogie frame).
It considers materials used for design of car bodies and bogie frames (steel, aluminum, castings and forgings) and the manufacturing according to the standards valid for railway applications.
Note    As a manufacturing standard, EN 15085 series covers the welding of rail vehicle structures.
It is applicable for variable amplitude load data with total number of cycles higher than 10000 cycles.
This document is not applicable for:
-   Corrosive conditions or
-   Elevated temperature operation in the creep range.
A static strength assessment is outside the scope of this European Standard.

Bahnanwendungen - Betriebsfestigkeitsnachweis von Schienenfahrzeugstrukturen

Der Zweck dieser Europäischen Norm ist, ein Verfahren zum Nachweis der Ermüdungsfestigkeitsnachweis als Betriebsfestigkeitsnachweis für Schienenfahrzeug-Strukturen festzulegen.
Dieses Dokument ist für alle Schienenfahrzeug-Strukturen anwendbar, die durch die Reihe EN 12663 (Wagenkasten) und EN 13749 (Drehgestellrahmen) abgedeckt sind.
Es berücksichtigt Werkstoffe für die Konstruktion der Wagenkästen und Drehgestellrahmen (Stahl, Aluminium, Guss- und Schmiedeteile) sowie die Fertigung nach für Schienenfahrzeuganwendungen gültigen Normen.
ANMERKUNG Als Fertigungsnorm deckt die Reihe EN 15085 das Schweißen von Schienenfahrzeug-Strukturen ab.
Sie ist für Daten variabler Belastungsamplituden mit einer Gesamtzahl von mehr als 10 000 Spannungszyklen anwendbar.
Dieses Dokument ist nicht anwendbar für:
 Korrosive Bedingungen oder
 Betrieb bei erhöhten Temperaturen im Kriechbereich.
Ein statischer Festigkeitsnachweis liegt außerhalb des Anwendungsbereichs dieser Europäischen Norm.

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

La présente Norme européenne vise à spécifier le mode opératoire à appliquer pour la détermination de la limite de fatigue des structures de véhicules ferroviaires sur la base des dommages cumulés.
Le présent document s'applique à toutes les structures de véhicules ferroviaires couvertes par la série EN 12663 (structures de véhicules) et l'EN 13749 (châssis de bogie).
Il traite des matériaux utilisés lors de la conception des structures de véhicules et des châssis de bogie (acier, aluminium, pièces moulées et forgées) et de la fabrication selon les normes en vigueur pour les applications ferroviaires.
NOTE La série EN 15085, qui traite du soudage des structures de véhicules ferroviaires, est un exemple de norme de fabrication.
Le présent document est applicable pour des données de charge à amplitude variable avec un nombre total de cycles supérieur à 10 000 cycles.
Le présent document n'est pas applicable dans les cas suivants :
 conditions corrosives ; ou
 exploitation à une température élevée dans la plage de fluage.
L'évaluation de la résistance statique ne relève pas du domaine d'application de la présente Norme européenne.

Železniške naprave - Ocenjevanje odpornosti proti utrujenosti konstrukcije železniških vozil na podlagi kumulativnega poškodovanja

General Information

• Status: Not Published
• Publication Date: 10-Apr-2019
• ICS: 45.060.20 - Trailing stock
• Technical Committee: CEN/TC 256 - Railway applications
• Drafting Committee: CEN/TC 256/WG 2 - Structural requirements
• Current Stage: 4098 - Decision to abandon - Enquiry
• Completion Date: 03-Apr-2019
• Directive: 2008/57/EC - Directive 2008/57/EC of the European Parliament and of the Council of 17 June 2008 on the interoperability of the rail system within the Community (Recast)
• Ref Project: oSIST prEN 17149:2017 - Railway Applications - Fatigue strength assessment of railway vehicle structures based on cumulative damage

Standards Content (Sample)

SLOVENSKI STANDARD
01-november-2017
Železniške naprave - Ocenjevanje odpornosti proti utrujenosti konstrukcije
železniških vozil na podlagi kumulativnega poškodovanja
Railway Applications - Fatigue strength assessment of railway vehicle structures based
on cumulative damage
Bahnanwendungen - Betriebsfestigkeitsnachweis von Schienenfahrzeugstrukturen
Applications ferroviaires - Évaluation de la résistance à la fatigue des structures de
véhicule ferroviaire basée sur la méthode des dommages cumulés
Ta slovenski standard je istoveten z: prEN 17149
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2017
ICS 45.060.20
English Version
Railway Applications - Fatigue strength assessment of
railway vehicle structures based on cumulative damage
Applications ferroviaires - Évaluation de la résistance à Bahnanwendungen - Betriebsfestigkeitsnachweis von
la fatigue des structures de véhicule ferroviaire basée Schienenfahrzeugstrukturen
sur la méthode des dommages cumulés
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 256.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 17149:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms, definitions, symbols and abbreviations . 6
3.1 Terms and definitions . 6
3.2 Symbols and abbreviations . 11
4 Stress determination . 15
4.1 General . 15
4.2 Determination of nominal stresses for non-welded structures . 15
4.3 Determination of nominal stresses related to welded structures . 15
4.3.1 General . 15
4.3.2 Stress assessment location . 16
4.4 Determination of structural stresses and notch stresses related to welded structures . 19
5 Fatigue resistance . 19
5.1 Fatigue strength of non-welded structures . 19
5.1.1 General . 19
5.1.2 Component fatigue strength . 20
5.1.3 Material properties . 20
5.1.4 Design Parameters . 21
5.1.5 Fatigue strength factors for normal and shear stresses . 23
5.1.6 Mean stress factor . 24
5.1.7 Fatigue strength factor for castings . 25
5.1.8 General for S-N curves and methods of cumulative damage rule . 26
5.2 Fatigue strength of welded structures . 29
5.2.1 General . 29
5.2.2 Reference values of fatigue strength . 30
5.2.3 Component fatigue strength . 30
5.2.4 Influence of thickness and bending . 30
5.2.5 Mean stresses factor and residual stress factor . 31
5.2.6 Enhancement factor for post weld improvement f . 32
post
5.2.7 Enhancement factor for NDT-level during manufacture f . 33
M,NDT
5.2.8 S-N curves and methods of cumulative damage rule . 33
5.2.9 Enhancement of fatigue strength by separate tests. 35
6 Concept of partial factors . 35
6.1 General . 35
6.2 Partial factor for stress spectrum γ . 35
L
6.3 Partial factors for fatigue strength . 36
6.3.1 Partial factor for design values of fatigue strength γ . 36
M
6.3.2 Partial factor for safety category γ . 37
M,S
6.3.3 Partial factor for inspection during maintenance γ . 37
M,I
6.3.4 Partial factor for degree of validation process γ . 38
M,V
7 Procedure of fatigue assessment . 39
7.1 General . 39
7.2 Assessment procedure . 39
7.3 Stress determination . 40
7.4 Data pre-processing . 40
7.4.1 Conditioning . 40
7.4.2 Application of partial factor for stress spectrum γ . 40
L
7.4.3 Counting . 40
7.4.4 Mean stress adjustment . 40
7.4.5 Omission . 41
7.5 Damage calculation for each single stress component . 41
7.5.1 General . 41
7.5.2 Determination of stress spectrum shape factor . 41
7.5.3 Determination of admissible damage sum . 42
7.5.4 Determination of cumulative damage sum and scaling factor to reach admissible
damage sum . 42
7.6 Assessment of fatigue strength . 44
Annex A (informative) Procedure for determination of mean stress factors for non-welded
and welded structures . 46
Annex B (informative) Example specification for permissible of volumetric defects in
castings of steel, iron and aluminium . 49
Annex C (normative) Surface roughness factor for cut edges of steel . 50
Annex D (normative) Reference values of the fatigue strength Δσ and Δτ for notch cases
C C
of welded structures of steel . 51
Annex E (normative) Reference values of the fatigue strength Δσ and Δτ for notch cases of
C C
welded structures of aluminium . 80
Annex F (normative) Thickness influence for welded structures of steel and consideration
of bending for welded structures of steel and of aluminium . 96
Annex G (informative) Enhancement of reference value of the fatigue strength Δσ for load
C
carrying T- and cruciform joints with double fillet weld with or without partial
penetration . 100
Annex H (informative) Application of structural stress assessment for welded structures of
steel and aluminium . 103
Annex I (informative)  Application of notch stress assessment for welded structures of steel
and aluminium . 107
Annex J (informative)  Example for fatigue assessment . 121
Annex K (informative)  Determination of nominal stresses in weld root of single sided
partial penetration welds . 127
Bibliography .
...