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1、International Standard 6311 0 *g# INTERNATIONAL ORGANIZATION FOR STANDARDlZATION*MEX,ilYHAPOHAR OPrAHM3AUkIR flOCTAHAPTH3AUWiRGANlSATlON INTERNATIONALE DE NORMALISATION Road vehicles - Brake linings - Internal shear strength of lining material - Test procedure V4hicules routiers - Garnitures de frei
2、ns - Rbsistance au cisaillement interne du matbriau de garniture - Mbthode dessai First edition - 1960-06-01 UDC 621.113-597.2: 620.176.2 Descriptors : road vehicles, brake linings, tests, shear tests, shear strength, test equipment. Ref.No. ISO6311-1960(E) Price based on 2 pages Copyright Internati
3、onal Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:52:15 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0 (the International Organization for Standardization)
4、is a worldwide federation of national standards institutes (IS0 member bodies). The work of developing Inter- national Standards is carried out through IS0 technical committees. Every member body interested in a subject for which a technical committee has been set up has the right to be represented
5、on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. Draft international Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by
6、 the IS0 Council. International Standard IS0 8311 was developed by Technical Committee ISO/TC 22, Road vehicles, and was circulated to the member bodies in November 1978. It has been approved by the member bodies of the following countries : Austria Belgium Brazil Bulgaria Czechoslovakia Denmark Fra
7、nce Germany, F.R. India Ireland Italy Japan Korea, Dem.P.Rep. of Mexico Netherlands Poland Romania South Africa, Rep. of No member body expressed disapproval of the document. Spain Sweden Switzerland Turkey United Kingdom USA USSR Yugoslavia 0 International Organization for Standardization, 1980 l P
8、rinted in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:52:15 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS
9、0 6311-1980 (E) Road vehicles - Brake linings - Internal shear strength of lining material - Test procedure 0 Introduction While 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
10、 by geometric effects. The value of the most stressed brake shoe is to be taken as a basis. 1 Scope and field of application This International Standard specifies a method of measuring the internal shear strength (stress) of brake lining materials. 5 Sampling and conditioning Samples (at least five)
11、 shall be taken from stock, and the test specimen chosen so that it will shear in a plane parallel to the plane or surface of stress at normal service conditions. Dimensions of test specimen (the specimen shall be flat). Length : 20 + 0,l mm Width : 20 f 0,l mm Thickness : 5 + 0,l or 10 * 0,l mm Thi
12、s International Standard applies to friction materials for disc brake pads and drum brake linings to be used on road vehicle brakes. 6 Apparatus 2 Reference IS0 611, Braking of motor vehicles and their trailers - Ter- minolog y. 3 Symbols and units Designation Shear strength Symbol 7 Unit N/mm2 4 De
13、finitions 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 shear force : The force vertical to the lining or pad, which causes the shearing (see figure, clause 6). For general definitions, see IS0 61 I, The appara
14、tus comprises a tensile or compression test machine which is equipped with the fixture 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, Th
15、e rate of load application shall be controlled in such a way that the load increases with an average rate of 4 500 + 500 N/s. 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 2 260 N/s, when the shear
16、 force is above 5000 N. NOTE - In the case of hydraulically operated tensile or compression 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 con
17、sist of two blocks, which slide with as little friction as possible against one another, 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 thaf an allowance can be made in calculating the ap- plied load. The blocks shal
18、l be grooved to receive the specimen. The specimen shall fill the grooves completely to prevent tilt under load. It is essential that the shear force is applied through the centre 1 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technica
19、l Standards 1/9972545001 Not for Resale, 04/25/2007 20:52:15 MDTNo reproduction or networking permitted without license from IHS -,-,- IS0 6311-1980 (El of fixture and specimen, and parallel to the guide within 0,l mm at a length of 100 mm. increase shall be as specified in clause 6. NOTE - The test
20、 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 of stress at normal service conditions, 8 Test report State in the test report (as an average measurements) th
21、e maximum load applied, The load must not be applied in shocks and the rate of the sheared area in square millimetres. Guide Specimen Block of at least five in newtons, and Figure - Principle of the test rig 2 Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/25/2007 20:52:15 MDTNo reproduction or networking permitted without license from IHS -,-,-