ISO/FDIS 7905-4

Plain bearings -- Bearing fatigue

Paliers lisses -- Fatigue des paliers

General Information

• Status: Published
• ICS: 21.100.10 - Plain bearings
• Technical Committee: ISO/TC 123/SC 2 - Materials and lubricants, their properties, characteristics, test methods and testing conditions
• Drafting Committee: ISO/TC 123/SC 2 - Materials and lubricants, their properties, characteristics, test methods and testing conditions
• Current Stage: 5092 - FDIS referred back to TC or SC
• Start Date: 23-Jun-2021

RELATIONS

• Revised: ISO 7905-4:1995 - Plain bearings -- Bearing fatigue
• Effective Date: 23-Apr-2020

Standards Content (sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 7905-4
ISO/TC 123/SC 2
Plain bearings — Bearing fatigue —
Secretariat: DIN
Voting begins on:
Part 4:
2021-04-09
Tests on half-bearings of a metallic
Voting terminates on:
multilayer bearing material
2021-06-04
Paliers lisses — Fatigue des paliers —
Partie 4: Essais sur demi-coussinets en matériau antifriction
métallique multicouche
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 7905-4:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. ISO 2021
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ISO/FDIS 7905-4:2021(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

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ii © ISO 2021 – All rights reserved
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ISO/FDIS 7905-4:2021(E)
Contents Page

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

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

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

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

4 Symbols .......................................................................................................................................................................................................................... 1

5 Test specimens........................................................................................................................................................................................................ 2

6 Test methods ............................................................................................................................................................................................................. 2

7 Evaluation and presentation of test results ............................................................................................................................. 4

Annex A (informative) Evaluation of stress ................................................................................................................................................... 5

Bibliography .............................................................................................................................................................................................................................10

© ISO 2021 – All rights reserved iii
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ISO/FDIS 7905-4:2021(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

This document was prepared by Technical Committee ISO/TC 123, Plain bearing, Subcommittee SC 2,

Materials and lubricants, their properties, characteristics, test methods and testing conditions.

This second edition cancels and replaces the first edition (ISO 7905-4:1995), which has been editorially

revised. The main changes compared to the previous edition are as follows:
— adjustments to ISO/IEC Directives, Part 2:2018 have been made;
— Annex A has been revised;
— the Bibliography has been revised.
A list of all parts in the ISO 7905 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
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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 7905-4:2021(E)
Plain bearings — Bearing fatigue —
Part 4:
Tests on half-bearings of a metallic multilayer bearing
material
1 Scope

This document specifies a method for the determination of the endurance limit in fatigue of half-

bearings of multilayer bearing materials.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

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

ISO 4386-3, Plain bearings — Metallic multilayer plain bearings — Part 3: Non-destructive penetrant testing

3 Terms and definitions
No terms and definitions are listed in this document.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
4 Symbols
The symbols used are given in Table 1.
Table 1 — Symbols
Symbol Description Unit
A coefficient of stress at the bearing backing ―
a 3 coefficients at the outside of the bearing back with i = 0, 1, 2 ―
1,i
A coefficient of stress at the surface of the lining ―
a 3 coefficients at the surface of the lining with i = 0, 1, 2 ―
2,i
b bearing width mm
B coefficient of stress at the bearing backing ―
b 3 coefficients at the outside of the bearing back with i = 0, 1, 2 ―
1,i
B coefficient of stress at the surface of the lining ―
b 3 coefficients at the surface of the lining with i = 0, 1, 2 ―
2,i
E Young’s modulus MPa
E Young’s modulus, steel bearing backing, E = 210 · 10 MPa
1 1
E Young’s modulus, lining Pa
© ISO 2021 – All rights reserved 1
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ISO/FDIS 7905-4:2021(E)
Table 1 (continued)
Symbol Description Unit
E* dimensionless Young’s modulus, E* = E /E ―
2 2 2 2.0

E Young’s modulus of bearing used to construct curves in Figure A.2, E = 50 · 10 MPa

2,0 2,0
E Young’s modulus, overlay Pa
F radial force N
r̄ radius of mean thickness r̄ = (r + r ) · 0,5 mm
3 4
r radius of interface between the bearing backing and lining mm
r radius of running surface (overlay thickness negligible) mm
r outer radius of bearing steel back mm
s total thickness of bearing mm
s* dimensionless total thickness, s* = 2 · [(r – r )/(r + r )] ―
4 3 4 3
s thickness of steel backing mm
* *
s dimensionless steel backing thickness,
...