1、BSI AU*L8O PARTSE 82 3b24bb 0033333 4 BSAU 180:Part2:1982 IS0 631 1 - 1980 UDC 629.11-597.6 : 620.1 O British Standards Institution. No part of this publication may be photocopied or otherwise reproduced without the prior permission in writing of BSI. British Standard Automobile Series Brake linings
2、 Part 2. Method for measurement of internal shear strength of lining material IS0 title: Road vehicles - Brake linings - Internal shear strength of lining material - Test procedure1 Srie automobile. Garnitures de freins Partie 2. Mthode de mesure de la rsistance au cisaillement interne du matriau de
3、 garniture Kraftfahrzeugserie. Bremsbelge Teil 2. Meverfahren fr die I nnenscherfestigkeit des Belagstoffes National foreword This British Standard has been prepared under the direction of the Automobile Standards Committee and is identical with IS0 631 1-1980 Road vehicles - Brake linings - Interna
4、l shear strength of lining materials - Test procedure, published by the International Organization for Standardization (ISO). Terminology and conventions. The text of the international standard has been approved as suitable for publication as a British Standard without deviation, Some terminology an
5、d certain conventions are not identical with those used in British Standards; attention is especially drawn to the following. The comma has been used throughout as a decimal marker. In British Standards it is current practice to use a full point on the baseline as the decimal marker. Wherever the wo
6、rds International Standard appear, referring to this standard, they should be read as British Standard. Cross-reference. At present there is no corresponding British Standard for IS0 611. However, it is intended to publish a related standard at a future date. The technical committee has reviewed the
7、 provisions of IS0 61 1 and has decided that they are acceptable for use in conjunction with this standard. British Standards Institution C-IOB-I COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling ServicesBS AU 180 : Part 2 : 1982 O Introduction While
8、braking under normal service conditions, a shear stress is generated in the disc brake pad lining material. In the case of drum brake linings the shear stress is increased by geometric effects. The value of the most stressed brake shoe is to be taken as a basis. 1 This International Standard specifi
9、es a method of measuring the internal shear strength (stress) of brake lining materials. This International Standard applies to friction materials for disc brake pads and drum brake linings to be used on road vehicle brakes. Scope and field of application 2 Reference IS0 61 1, Braking of motor vehic
10、les and their trailers - Ter- minolog y. 3 Symbols and units Designation Symbol Unit Shear strength 7 N/mmz Shear force F N Area under stress A mm* 4 Definitions 4.1 internal shear strength : For the purposes of this Inter- national Standard, the ratio of the shear force to the stressed area. 4.2 wh
11、ich causes the shearing (see figure, clause 6). For general definitions, see IS0 61 1. shear force : The force vertical to the lining or pad, 5 Sampling and conditioning Samples (at least five) shall be taken from stock, and the test specimen chosen so that it will shear in a plane parallel to the p
12、lane or surface of stress at normal service conditions. Dimensions of test specimen (the specimen shall be flat). Length : 20 I: 0,l mm Width : 20 f 0,l mm Thickness : 5 f 0,l or 10 f 0,l mm 6 Apparatus The apparatus comprises a tensile or compression test machine which is equipped with the fixture
13、and can apply the required load in the prescribed manner. The test machine shall be pro- vided with equipment to register the load at shear, for example maximum indicator pointer or print-out recording of load. The rate of load application shall be controlled in such a way that the load increases wi
14、th an average rate of 4 500 f 500 Ns. It is further recommended that the unit controlling the rate of load functions in such a way that instantaneous rate is within the limits of 4 500 f 2 250 N/s, when the shear force is above 5000 N. NOTE - In the case of hydraulically operated tensile or compress
15、ion test machines this specification can be met by setting the unloaded movement of the piston. The rate of speed, in millimetres per second, depends on the type of machine. The fixture (see the figure) shall consist of two blocks, which slide with as little friction as possible against one another,
16、 with a maximum movement of 0,l mm. The friction between the block and the guide shall be minimal or capable of being re- corded so that an allowance can be made in calculating the ap- plied load. The blocks shall be grooved to receive the specimen. The specimen shall fill the grooves completely to
17、prevent tilt under load. It is essential that the shear force is applied through the centre COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling ServicesBSI AU*LBO PART*:2 82 1b24bb 0031333 8 BS AU 180 : Part 2 : 1982 of fixture and specimen, and paralle
18、l to the guide within 0,l mm at a length of 10 mm. increase shall be as specified in clause 6. NOTE - The test shall be carried out to breakage of the lining material. 7 Test method Place the specimen in the fixture and apply the continuously increasing load in a direction parallel to the direction
19、of stress at normal service conditions. The load must not be applied in shocks and the rate of 8 Test report State in the test report ias an average of at least five measurements) the maximum load applied, in newtons, and the sheared area in square millimetres. Guide Specimen Block t Figure - Princi
20、ple of the test rig COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling ServicesBSI AU*18O PART*2 This British Standard, having been prepared under the direction of the Automobile Standards Committee, was published under the authority of the Board of BS
21、I and comes into effect on 31 March 1982. O British Standards Institution, 1982 ISBN O 580 12534 3 British Standards Institution Incorporated by Royal Charter, BSI is the independent national body for the preparation of British Standards. It is the UK member of the International Organization for Sta
22、ndardization and UK sponsor of the British National Committee of the International Electrotechnical Commission. Copyright Users of British Standards are reminded that copyright subsists in all BSI publications. No part of this publication may be reproduced in any form without the prior permission in
23、 writing of BSI. This does not preclude the free use, in the course of implementing the standard, of necessary details such as symbols and size, type or 82 3624bb O031334 T BSAU 180:PartZ: 1982 IS0 631 1-1980 grade designations. Enquiries should be addressed to the Publications Manager, 101 Pentonvi
24、lle Road, London NI 9ND (Telephone 01-837 8801; Telex 23218). Contract requirements Attention is drawn to the fact that this British Standard does not purport to include all the necessary provisions of a contract, Revision of British Standards British Standards are revised, when necessary, by the is
25、sue either of amendment slips or of revised editions. It is important that users of British Standards should ascertain that they are in possession of the latest amendments or editions. Information on all BSI publications is in the BS Yearbook, supplemented each month by BSI News which is available t
26、o subscribing members of the Institution and gives details of new publications, revisions, amendments and withdrawn standards. The following BSI references relate to the work on this standard: Committee reference AUE/I 1 Draft for comment 78/80968 DC For information about BSI services relating to th
27、ird party certification to suitable British Standard product specifications, schemes for the registration of firms of assessed capability, testing and inspection facilities and Technical Help to Exporters, please contact the Director, BSI, Maylands Avenue, Hemel Hempstead, Herts HP2 4SQ Tel. Hemel H
28、empstead 31 11, Amendments issued since publication Amd. No. Date of issue Text affected British Standards Institution . 2 Park Street London WIA 2BS . Telephone 01-629 9000 . Telex 266933 8203-2-1.4k-B AUE11 1 C-I OB-4 COPYRIGHT British Standards Institution on ERC Specs and StandardsLicensed by Information Handling Services
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