ISO/DIS 22074-8

Railway infrastructure -- Rail fastening systems

Infrastructure ferroviaire -- Systèmes de fixation du rail

Standards Content (sample)

DRAFT INTERNATIONAL STANDARD
ISO/DIS 22074-8
ISO/TC 269/SC 1 Secretariat: AFNOR
Voting begins on: Voting terminates on:
2021-03-23 2021-06-15
Railway infrastructure — Rail fastening systems —
Part 8:
Determination of stiffness
ICS: 45.080
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENT AND APPROVAL. IT IS
THEREFORE SUBJECT TO CHANGE AND MAY
NOT BE REFERRED TO AS AN INTERNATIONAL
STANDARD UNTIL PUBLISHED AS SUCH.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
This document is circulated as received from the committee secretariat.
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
Reference number
NATIONAL REGULATIONS.
ISO/DIS 22074-8:2021(E)
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. ISO 2021
---------------------- Page: 1 ----------------------
ISO/DIS 22074-8:2021(E)
COPYRIGHT PROTECTED DOCUMENT
© ISO 2021

All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may

be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting

on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address

below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved
---------------------- Page: 2 ----------------------
ISO/DIS 22074-8:2021(E)
Contents Page

Foreword ........................................................................................................................................................................................................................................iv

Introduction ..................................................................................................................................................................................................................................v

1 Scope ................................................................................................................................................................................................................................. 1

2 Normative references ...................................................................................................................................................................................... 1

3 Terms and definitions ..................................................................................................................................................................................... 1

4 Symbols and abbreviated terms ........................................................................................................................................................... 2

5 Verification of calibration ........................................................................................................................................................................... 3

6 Test procedures for pads ............................................................................................................................................................................. 3

6.1 Static test procedure for pads .................................................................................................................................................... 3

6.1.1 Principle .................................................................................................................................................................................. 3

6.1.2 Apparatus ............................................................................................................................................................................... 3

6.1.3 Procedure ............................................................................................................................................................................... 4

6.1.4 Test report ............................................................................................................................................................................. 5

6.2 Dynamic low frequency test procedure for pads ...................................................................................................... 6

6.2.1 General...................................................................................................................................................................................... 6

6.2.2 Principle .................................................................................................................................................................................. 6

6.2.3 Apparatus ............................................................................................................................................................................... 6

6.2.4 Procedure ............................................................................................................................................................................... 6

6.2.5 Test report ............................................................................................................................................................................. 7

7 Test procedures for complete rail fastening assemblies ............................................................................................ 7

7.1 Static test procedure for fastening assemblies ............................................................................................................ 7

7.1.1 Principle .................................................................................................................................................................................. 7

7.1.2 Apparatus ............................................................................................................................................................................... 8

7.1.3 Test specimens................................................................................................................................................................... 8

7.1.4 Procedure ............................................................................................................................................................................... 8

7.1.5 Test report ............................................................................................................................................................................. 9

7.2 Dynamic low frequency test for fastening assemblies ......................................................................................10

7.2.1 General...................................................................................................................................................................................10

7.2.2 Principle ...............................................................................................................................................................................10

7.2.3 Apparatus ............................................................................................................................................................................10

7.2.4 Procedure ............................................................................................................................................................................10

7.2.5 Test report ..........................................................................................................................................................................11

Bibliography .............................................................................................................................................................................................................................12

© ISO 2021 – All rights reserved iii
---------------------- Page: 3 ----------------------
ISO/DIS 22074-8:2021(E)
Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards

bodies (ISO member bodies). The work of preparing International Standards is normally carried out

through ISO technical committees. Each member body interested in a subject for which a technical

committee has been established has the right to be represented on that committee. International

organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.

ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of

electrotechnical standardization.

The procedures used to develop this document and those intended for its further maintenance are

described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the

different types of ISO documents should be noted. This document was drafted in accordance with the

editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of

any patent rights identified during the development of the document will be in the Introduction and/or

on the ISO list of patent declarations received (see www .iso .org/ patents).

Any trade name used in this document is information given for the convenience of users and does not

constitute an endorsement.

For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and

expressions related to conformity assessment, as well as information about ISO's adherence to the

World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/

iso/ foreword .html.

This document was prepared by Technical Committee [or Project Committee] ISO/TC [or ISO/PC] ###,

[name of committee], Subcommittee SC ##, [name of subcommittee].

This second/third/… edition cancels and replaces the first/second/… edition (ISO #####:####), which

has been technically revised.
The main changes compared to the previous edition are as follows:
— xxx xxxxxxx xxx xxxx
A list of all parts in the ISO ##### series can be found on the ISO website.

Any feedback or questions on this document should be directed to the user’s national standards body. A

complete listing of these bodies can be found at www .iso .org/ members .html
iv © ISO 2021 – All rights reserved
---------------------- Page: 4 ----------------------
ISO/DIS 22074-8:2021(E)
Introduction

This standard brings together test methods for measuring the stiffness of pads and fastening assemblies

under static and low frequency dynamic loading.

No method for testing at acoustic frequencies is included. The procedure in EN 15461, which involves

testing a length of track incorporating the fastening assemblies under test is recommended.

© ISO 2021 – All rights reserved v
---------------------- Page: 5 ----------------------
DRAFT INTERNATIONAL STANDARD ISO/DIS 22074-8:2021(E)
Railway infrastructure — Rail fastening systems —
Part 8:
Determination of stiffness
1 Scope

This International Standard specifies laboratory test procedures to determine the static and low

frequency dynamic stiffness of rail pads, baseplate pads and complete rail fastening assemblies.

2 Normative references

The following documents, in whole or in part, are normatively referenced in this document and are

indispensable for its application. For dated references, only the edition cited applies. For undated

references, the latest edition of the referenced document (including any amendments) applies.

ISO 22074-1, Railway infrastructure — Rail fastening systems — Part 1: Vocabulary

ISO 22074-4, Railway applications — Infrastructure - Rail fastening systems — Part 4: Effect of

repeated loading

ISO 6344-1:1998, Coated abrasives — Grain size analysis — Part 1: Grain size distribution test

ISO 7500-1:2004, Metallic materials — Verification of static uniaxial testing machines —

Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system

(ISO 7500-1:2004)

ISO 9513:2002, Metallic materials — Calibration of extensometers used in uniaxial testing (ISO 9513:1999)

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 22074-1 apply.

3.1
static stiffness

force required to cause a unit displacement of a pad or a rail fastening assembly with the load applied

slowly enough to avoid all significant loading rate effects.
3.2
low frequency dynamic stiffness

force required to cause a unit displacement of a pad or a rail fastening assembly with a cyclic load

applied at a frequency and force amplitude representative of the loading in conventional railway track

associated with passing wheels or bogies.
© ISO 2021 – All rights reserved 1
---------------------- Page: 6 ----------------------
ISO/DIS 22074-8:2021(E)
4 Symbols and abbreviated terms
Relevant
sub-clause

F reference force applied to pad in measurement of static stiffness of pad, in kN; 6.1.3

SPmax

F lower limit of force for determining the static secant stiffness of a pad, in kN; 6.1.3

SP1
(approximately equal to the clamping force expected in a fastening system).

F upper limit of force for determining the static secant stiffness of a pad, in kN 6.1.3

SP2
k static stiffness of pad, in MN/m; 6.1.3
d mean vertical displacement of pad, in mm; 6.1.3

F reference force for measurement of dynamic low frequency stiffness of pad, in kN; 6.2.3.2

LFPmax

F lower limit of force for determining the dynamic low frequency stiffness of pad, in 6.2.4

LFP1
kN; (approximately equal to the clamping force expected in a fastening system).

F upper limit of force for determining the dynamic low frequency stiffness of pad, in kN 6.2.4

LFP2
d displacement of pad in measurement of low frequency dynamic stiffness of 6.2.4
LFP
pad, in mm;

f frequency of measurement of low frequency measurement dynamic stiffness of 6.2.4

LFP
pad, in Hz;
k low frequency dynamic stiffness of pad at a specific frequency, in MN/m; 6.2.4
LFPf

k mean of measurements of low frequency dynamic stiffness of pad measured at 6.2.4

LFPmean
5 Hz, 10 Hz and 20 Hz, in MN/m;
F reference force for measurement of static stiffness of assembly, in kN; 7.1.4
SAmax
k static stiffness of assembly, in MN/m; 7.1.4

d mean displacement of rail in measurement of static stiffness of assembly, in mm; 7.1.4

F lower limit of force for determining the static secant stiffness of assembly, in kN; 7.1.4

SA1

F upper limit of force for determining the static secant stiffness of assembly = 0,8 7.1.4

SA2
F in kN;
LFAmax,
k low frequency dynamic stiffness of assembly, in MN/m; 7.2.4
LFA

F lower limit of force for determining the dynamic low frequency stiffness of as- 7.2.4

LFA1
sembly, in kN;

F upper limit of force for determining the dynamic low frequency stiffness of as- 7.2.4

LFA2
sembly, in kN;

F reference force for measurement of dynamic low frequency stiffness of assem- 7.2.4

LFAmax
bly, in kN;

d displacement of assembly in measurement of dynamic low frequency stiffness of 7.2.4

LFA1
assembly for force F , in mm;
LFA1
2 © ISO 2021 – All rights reserved
---------------------- Page: 7 ----------------------
ISO/DIS 22074-8:2021(E)
5 Verification of calibration

The static calibration of actuators shall be verified in accordance with ISO 7500-1 using equipment

having traceability to European or International Standards using the International System of Units (SI).

The calibration of displacement measuring instruments shall be in accordance with ISO 9513.

6 Test procedures for pads
6.1 Static test procedure for pads
6.1.1 Principle
A force is applied normal to the test pad and the displacement is measured.
6.1.2 Apparatus
6.1.2.1 Controlled temperature test area

The area of the laboratory where the test is conducted, maintained at (25 ± 5) °C.

Where pads are to be used at other ambient temperatures additional tests shall be performed in

a temperature controlled chamber, if required by the purchaser, at one or more of the following

temperatures:
(−30 ± 3) °C, (−20 ± 3) °C, (−10 ± 3) °C, (0 ± 3) °C and (50 ± 3) °C.

Additional test temperatures may be agreed between the manufacturer and the purchaser.

6.1.2.2 Metal plate
A rigid metal plate larger than the load distribution plate.
6.1.2.3 Load distribution
...