SANS 957-2010 Road vehicles - Brake linings - Compressive strain test methods《道路车辆 制动闸衬 压缩应变试验方法》.pdf

1、 Collection of SANS standards in electronic format (PDF) 1. Copyright This standard is available to staff members of companies that have subscribed to the complete collection of SANS standards in accordance with a formal copyright agreement. This document may reside on a CENTRAL FILE SERVER or INTRA

2、NET SYSTEM only. Unless specific permission has been granted, this document MAY NOT be sent or given to staff members from other companies or organizations. Doing so would constitute a VIOLATION of SABS copyright rules. 2. Indemnity The South African Bureau of Standards accepts no liability for any

3、damage whatsoever than may result from the use of this material or the information contain therein, irrespective of the cause and quantum thereof. ISBN 978-0-626-23662-5 SANS 957:2010Edition 2ISO 6310:2009Edition 3SOUTH AFRICAN NATIONAL STANDARD Road vehicles Brake linings Compressive strain test me

4、thods This national standard is the identical implementation of ISO 6310:2009 and is adopted with the permission of the International Organization for Standardization. Published by SABS Standards Division 1 Dr Lategan Road Groenkloof Private Bag X191 Pretoria 0001Tel: +27 12 428 7911 Fax: +27 12 344

5、 1568 www.sabs.co.za SABS SANS 957:2010 Edition 2 ISO 6310:2009 Edition 3 Table of changes Change No. Date Scope National foreword This South African standard was approved by National Committee SABS SC 22F, Steering committee for construction of motor vehicles Braking, in accordance with procedures

6、of the SABS Standards Division, in compliance with annex 3 of the WTO/TBT agreement. This SANS document was published in April 2010. This SANS document supersedes SANS 957:2009 (edition 1). Reference numberISO 6310:2009(E)ISO 2009INTERNATIONAL STANDARD ISO6310Third edition2009-07-01Road vehicles Bra

7、ke linings Compressive strain test methods Vhicules routiers Garnitures de freins Mthode dessai de la compressibilit SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) PDF disclaimer This PDF file may contain embedd

8、ed typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the computer performing the editing. In downloading this file, parties accept therein the responsibility of no

9、t infringing Adobes licensing policy. The ISO Central Secretariat accepts no liability in this area. Adobe is a trademark of Adobe Systems Incorporated. Details of the software products used to create this PDF file can be found in the General Info relative to the file; the PDF-creation parameters we

10、re optimized for printing. Every care has been taken to ensure that the file is suitable for use by ISO member bodies. In the unlikely event that a problem relating to it is found, please inform the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2009 All rights rese

11、rved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or ISOs member body in the country of the reques

12、ter. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2009 All rights reservedSANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing c

13、lients of the SABS .ISO 6310:2009(E) ISO 2009 All rights reserved iiiContents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references . 1 3 Terms and definitions. 1 4 Symbols and units 2 5 Principles. 3 5.1 General. 3 5.2 Test method A Coupon sample and/or airbrake pad 4 5.3 Test method B

14、 Hydraulic disc brake pad assembly. 4 6 Test apparatus 4 7 Test stand specifications. 5 7.1 Loading 5 7.2 Heated platen 5 7.3 Loading ram 5 8 Sampling 6 9 Test method. 6 9.1 General set-up. 6 9.2 Room temperature compressibility test. 6 9.3 Temperature transfer and thermal expansion measurements. 7

15、9.4 Hot compressibility test . 7 10 Test device deflection compensation. 7 11 Verification of the test stand using reference samples 8 12 Test report . 8 Annex A (informative) Example test report 13 SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing cli

16、ents of the SABS .ISO 6310:2009(E) iv ISO 2009 All rights reservedForeword 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

17、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

18、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 Interna

19、tional 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 b

20、e the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 6310 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 63

21、10:2001), which has been technically revised. SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) ISO 2009 All rights reserved vIntroduction The compressive response of a brake lining or pad is an important design pa

22、rameter. It is useful for the evaluation of brake fluid displacement during a brake application, brake-pedal travel and the propensity of the brake for generating judder or noise. It is also part of the brake pad characterization and a parameter for quality control. The purpose of the test methods d

23、escribed in this International Standard is to evaluate the compressive response or “compressibility” of friction materials or brake pad assemblies. The tests measure compressibility at ambient and elevated temperatures. During the elevated temperature portion of the test, the thermal transmission an

24、d response of the brake pad assembly are measured. SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .INTERNATION

25、AL STANDARD ISO 6310:2009(E) ISO 2009 All rights reserved 1Road vehicles Brake linings Compressive strain test methods 1 Scope This International Standard specifies a method for test and measurement of the compressive displacement of brake linings or brake pad assemblies due to loading and temperatu

26、re. It also provides a test method to assess lining thermal swell and growth. This International Standard applies to disc brake pad assemblies or coupon samples cut from the friction material. 2 Normative references The following referenced documents are indispensable for the application of this doc

27、ument. 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

28、document, the terms and definitions given in ISO 611 and the following apply. 3.1 compressibility C change in pad thickness or deflection, caused by a uniaxial compression load during the final loading cycle, to the maximum test pressure, which is measured in the same direction as the compression fo

29、rce, perpendicular to the friction surface 3.2 compressive strain ratio of the reduction in thickness of the brake lining, due to the compression load, to its initial thickness, which is measured in the direction of the application force, perpendicular to the friction surface SANS 957:2010This s tan

30、dard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) 2 ISO 2009 All rights reserved3.3 deflection D net deflection of the sample as a result of the subtraction of the deflection of the apparatus itself from the total deflection measured by

31、the apparatus D = Dtot Dappwhere Dtotis the total deflection measured by the apparatus; Dappis the deflection of the apparatus itself 3.4 friction material contact area A0measure of the area of friction material that carries the test load NOTE It is advisable that slots, chamfers and any other featu

32、res be accounted for in determining A0. 3.5 hot compressibility C400compressibility with a heated platen temperature of 400 C 3.6 temperature transfer TTtemperature rise at the backing plate of a brake pad assembly after the friction surface has been in contact with the heating plate at (400 10) C f

33、or a given period at a given pressure TT= T3 T2where T3is the final temperature of the backing plate during the hot test; T2is the initial temperature of the backing plate for the hot test 3.7 pad thermal growth dGpermanent change in thickness of the sample after the friction surface has been in con

34、tact with the heating plate at (400 10) C for a given period at a given pressure and then cooled down to room temperature 3.8 pad thermal swell dSchange in thickness of the sample after the friction surface has been in contact with the heating plate at (400 10) C for a given period at a given pressu

35、re 4 Symbols and units Table 1 lists the symbols and corresponding units used in this International Standard. SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) ISO 2009 All rights reserved 3Table 1 Symbols and unit

36、s Symbol Definition Unit Accuracy A0friction material contact area cm20,5 cm2C compressibility am 1 mC400hot compressibility m 1 m d average thickness of coupon sample bmm 0,1 mmdGpad growth or thermal expansion back at ambient temperature m 1 m dSpad swell or thermal expansion m 1 m D net deflectio

37、n of test sample cm 1 mDappdeflection of the test apparatus itself at pAdm 1 mDtottotal deflection measured by the test apparatus at the maximum test pressure m 1 m FBpre-load MPa e1 % fFPtest load MPa e1 % fpA test pressure at sample contact area or unit area pressure gMPae1 % fpDsimulated hydrauli

38、c line pressure hMPae1 % fT1test temperature of the heating plate for hot test C 2 C T2initial temperature of the backing plate for hot test C 2 C T3final temperature of the backing plate during hot test C 2 C TTtemperature transfer C 2 % pAcompressive strain at pAi 0,000 2 aD at pD. Used in test me

39、thod B. bAverage of five measurements. cDtot Dapp. dNo sample installed. e1 bar = 0,1 MPa. f1 % full-span accuracy. gTest method A. hTest method B. iD/d. Used in test method A. 5 Principles 5.1 General The test measures either: the compressive strain of a friction material coupon (test method A), or

40、 the compressive deflection of a brake pad assembly (test method B). Depending upon the type of sample, one of two alternative test methods is followed for applying the test load. Test results from test method A and test method B should not be directly compared. SANS 957:2010This s tandard may only

41、be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) 4 ISO 2009 All rights reserved5.2 Test method A Coupon sample and/or airbrake pad Test method A loads a sample coupon to the force required to achieve a unit-area pressure at the contact interface. Tes

42、t method A can be used to assess pad materials for drum brake assemblies, commercial vehicle disc or drum brakes and material coupons for research and development purposes. For large pads used on a commercial vehicle, measure the compressive strain at the left and the right halves separately or use

43、a segment cut in the radial direction. In other cases, sample sizes should be large enough to account for material not being homogeneous. Surfaces of coupon samples should be flat and parallel. Unless otherwise specified, report the compressive strain value, pA. 5.3 Test method B Hydraulic disc brak

44、e pad assembly Test method B loads the brake lining assembly to simulate a hydraulic line pressure of 10 MPa (100 bar) or 16 MPa (160 bar). NOTE In common practice, the line pressure is expressed in bar in order to differentiate it from the face pressure at the contact area. Test method B is typical

45、ly used for passenger car and light truck hydraulic disc brake pad assemblies. Unless otherwise specified, report the compressive deflection or compressibility value, C, in m. 6 Test apparatus The test apparatus shall consist of the following. 6.1 Compressibility test-stand or uniaxial material-test

46、ing load frame to provide a uniform load over the surface of the test sample. 6.2 Loading cylinder to simulate a calliper piston configuration for test method B; a loading ram surface larger than the sample contact area for test method A. 6.3 Compression platen. 6.4 Device to measure the applied com

47、pression force to an accuracy of 1 % of full-scale of the test apparatus. 6.5 Gauge to measure the time-based deflection of the sample with an accuracy of 0,001 mm. Position the gauge on the loading cylinder or on the platen and in contact with the loading ram as near to its centre line as possible.

48、 6.6 Recording device or computer to log load, pressure, displacements and temperatures as function of time. 6.7 Heating device to raise the temperature of the platen to a specified temperature. 6.8 Thermocouple (1,5 mm diameter recommended) to measure the temperature of the platen. The position of

49、the thermocouple should be as close as possible to the centre line of the loading ram and embedded 3 mm below the test surface of the platen. 6.9 Thermocouple or device to measure the temperature of the test sample. 6.10 Micrometer to measure sample thickness. SANS 957:2010This s tandard may only be used and printed by approved subscription and freemailing clients of the SABS .ISO 6310:2009(E) ISO 2009 All rights reserved 57 Test stand specifications 7.1 Loa