Road vehicles -- Brake linings -- Shear test procedure for disc brake pad and drum brake shoe assemblies

ISO 6312:2010 specifies a method for measuring the strength of the bond connection between the lining material and the carrier in disc brake pad and drum brake shoe assemblies (shear strength). ISO 6312:2010 is applicable to assemblies that are integrally moulded, bonded or that use mechanical retention systems (MRS) of both types used for brakes on road vehicles. ISO 6312:2010 does not apply to riveted assemblies.

Véhicules routiers -- Garnitures de freins -- Méthode d'essai de cisaillement des ensembles de plaquettes de freins à disque et segments de freins à tambour

General Information

Status
Published
Publication Date
10-Aug-2010
Current Stage
6060 - International Standard published
Start Date
30-Jul-2010
Completion Date
11-Aug-2010
Ref Project

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ISO 6312:2010 - Road vehicles -- Brake linings -- Shear test procedure for disc brake pad and drum brake shoe assemblies
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INTERNATIONAL ISO
STANDARD 6312
Third edition
2010-08-15
Road vehicles — Brake linings — Shear
test procedure for disc brake pad and
drum brake shoe assemblies
Véhicules routiers — Garnitures de freins — Méthode d'essai de
cisaillement des ensembles de plaquettes de freins à disque et
segments de freins à tambour
Reference number
ISO 6312:2010(E)
ISO 2010
---------------------- Page: 1 ----------------------
ISO 6312:2010(E)
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© ISO 2010

All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,

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ii © ISO 2010 – All rights reserved
---------------------- Page: 2 ----------------------
ISO 6312:2010(E)
Contents Page

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

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

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

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

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

4 Symbols and units.................................................................................................................................2

5 Sampling and conditioning ..................................................................................................................2

6 Test rig and fixtures ..............................................................................................................................2

6.1 Test rig....................................................................................................................................................2

6.2 Fixtures...................................................................................................................................................3

7 Test procedure.......................................................................................................................................5

8 Calculation of shear strength...............................................................................................................6

9 Presentation of results..........................................................................................................................6

Annex A (normative) Test procedure flowchart...............................................................................................8

Annex B (informative) Test report ...................................................................................................................10

Bibliography......................................................................................................................................................11

© ISO 2010 – All rights reserved iii
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ISO 6312:2010(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.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards

adopted by the technical committees are circulated to the member bodies for voting. Publication as an

International Standard requires approval by at least 75 % of the member bodies casting a vote.

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.

ISO 6312 was prepared by Technical Committee ISO/TC 22, Road vehicles, Subcommittee SC 2, Braking

systems and equipment.

This third edition cancels and replaces the second edition (ISO 6312:2001), which has been technically

revised.
iv © ISO 2010 – All rights reserved
---------------------- Page: 4 ----------------------
ISO 6312:2010(E)
Introduction

The shear property relates to stresses at the area of contact between lining and carrier in disc brake pad and

drum brake shoe assemblies.

The specification for the average rate of load and the recommendation for variations in the instantaneous rate

of load given in this International Standard take into account current practice, based upon an examination of

equipment in use.

This third edition of this International Standard incorporates technical updates generated in the course of

harmonization efforts during the development of ISO 15484.
© ISO 2010 – All rights reserved v
---------------------- Page: 5 ----------------------
INTERNATIONAL STANDARD ISO 6312:2010(E)
Road vehicles — Brake linings — Shear test procedure for disc
brake pad and drum brake shoe assemblies
1 Scope

This International Standard specifies a method for measuring the strength of the bond connection between the

lining material and the carrier in disc brake pad and drum brake shoe assemblies (shear strength). This

International Standard is applicable to assemblies that are integrally moulded, bonded or that use mechanical

retention systems (MRS) of both types used for brakes on road vehicles. This International Standard does not

apply to riveted assemblies.
2 Normative references

The following referenced documents are indispensable for the application 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 611, Road vehicles — Braking of automotive vehicles and their trailers — Vocabulary

3 Terms and definitions

For the purposes of this document, the terms and definitions given in ISO 611 and the following apply.

3.1
lining
friction material component of a brake lining assembly
3.2
carrier
component of a brake lining assembly to which the friction material is attached
3.3
bond area
contact area between lining and carrier
3.4
mechanical retention system
MRS

attachment method where mechanical protrusions on the backing plate aid the retention of the friction material

or the underlayer
3.5
shear force at failure
total load applied at the time of shear failure
© ISO 2010 – All rights reserved 1
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ISO 6312:2010(E)
3.6
shear strength at failure
ratio of the load at failure divided by the bond area
4 Symbols and units

The symbols and preferred units used in this International Standard are given in Table 1. See Clause 8.

Table 1 — Symbols and units
Quantity Symbol Unit
Shear force at failure F N
Bond area A mm
Shear strength at failure τ MPa
5 Sampling and conditioning

This procedure can also apply for samples during product development, on finished products, or after special

treatment (such as that covered by ISO 6314) or usage (inertia-dynamometer testing or field use) with the

appropriate preparation.

Perform the testing on a complete assembly or a section (coupon) of the assembly. When testing a section or

coupon, apply the load in the radial or tangential direction relative to the vehicle mounting position. Indicate

the test orientation on the test report.

If needed, prepare the sample edges to ensure good contact with the loading and fixed tools. Remove noise

insulating shims before the test.

When testing a lined shoe, the test area may cover the full assembly or segments of an assembly confined by

saw cutting down to the carrier (see Figure 1).
Use five samples for standard testing.
NOTE The test procedure applies a load in a direction that might not be in ac
...

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