ISO-4666-1-1982.pdf
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1、International Standard 4666/ 1 0 + Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 00:28:13 MDTNo reproduction or networking permitted without license from IHS -,-,- Foreword IS0
2、 (the international .Organization for Standardization) 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 com
3、mittee has been set up 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approva
4、l before their acceptance as International Standards by the IS0 Council. International Standard IS0 4BfWl was developed by Technical Committee ISO/TC 45, Rubber and rubber products, and was circulated to the member bodies in September 1979. It has been approved by the member bodies of the following
5、countries : Australia Austria Belgium China Czechoslovakia Denmark Egypt, Arab Rep. of France Germany, F. R, Hungary India Italy Korea, Rep. of Libyan Arab Jamahiriya Malaysia Netherlands Poland Romania South Africa, Rep. of Spain Sweden Switzerland Turkey United Kingdom USA USSR The member bodies o
6、f the following countries expressed disapproval of the document on technical grounds : Brazil Canada International Organization for Standardization, 1982 0 Printed in Switzerland Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical S
7、tandards 1/9972545001 Not for Resale, 04/27/2007 00:28:13 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL STANDARD IS0 4666/1-1962(E) Rubber, vulcanized - Determination of temperature rise and resistance to fatigue in flexometer testing - Part 1 : Basic princi
8、ples 0 Introduction Under cyclic deformation, all rubbers absorb a part of the deformation energy and convert this into heat as a result of their visco-elastic behaviour. The heat generated leads to a temperature rise which can be very considerable in the interior of relatively thick components beca
9、use of the low thermal con- ductivity of rubbers. In cases where the cyclic deformation or the temperature rise reaches high values, it is possible for damage to the rubber to occur through fatigue-initiated breakdown. This begins in the interior of the rubber, spreads outwards and can finally lead
10、to the complete breakdown of the component. The tests described in this International Standard yjeld either temperature rise data or the fatigue life of the rubber under given test conditions. Measurement of fatigue life over a range of conditions can be used to determine the limiting fatigue deform
11、ability or limiting fatigue stress of the rubber. The in- struments used, commonly called flexometers, may subject test pieces to cycles of either constant stress amplitude or con- stant strain amplitude. A distinction should be made between flexometer tests and fatigue tests conducted on thin test
12、pieces undergoing tensile deformation. In the latter tests, the temperature rise is generally negligible owing to the rapid dissipation of heat generated, and failure results from the initiation and growth of cracks which ultimately sever the test piece. IS0 132 and IS0 133 describe tests for the de
13、termination of flex cracking and cut growth, respectively, using the De Mattia-type machine. The deter- mination of resistance to tension fatigue will be described in IS0 6943. 1 Scope and field of application This part of IS0 4666 lays down general principles for, and defines the terms used in, fle
14、xometer testing. It gives directions for carrying out measurements which make possible predic- tions regarding the durability of rubbers in finished articles (tyres, bearings, supports, V-belts, cable-pulley insert rings and similar products subject to dynamic flexing in service). However, owing to
15、the wide variations in service conditions, no simple correlation between the accelerated tests described in this International Standard and service performance can be assumed. 2 References IS0 132, Vulcanized rubbers - Determination of resistance to flex cracking (De Mattia type machine). IS0 133, R
16、ubber vulcanized - Determination of crack growth (De Mattial. IS0 471, Rubber - Standard temperatures, humidities and times for the conditioning and testing of test pieces. IS0 1826, Rubber, vulcanized - Time-interval between vulcanization and testing - Specification. IS0 2856, Elastomers - General
17、requirements for dynamic testing. IS0 3363, Rubber - General directions for achieving elevated or sub-normal temperatures for tests. IS0 4666/2, Rubber, vulcanized - Determination of temperature rise and resistance to fatigue in flexometer testing - Part 2 : Rotary flexometer. IS0 4666/3, Rubber, vu
18、lcanized - Determination of temperature rise and resistance to fatigue in flexometer testing - Part 3 : Compression flexometer. 1) 3 Definitions For the purpose of this International Standard, the following definitions apply. For associated terms, refer to IS0 26% which gives the general requirement
19、s for dynamic testing. 3.1 loading : Subjection of the test piece to a predetermined stress or strain, either static or cyclic. 3.2 pre-stress, er, : The constant static stress to which the test piece is subjected during the test. NOTE - This may be used to simulate product requirements or simply to
20、 hold the test piece in the apparatus. 1) At present at the stage of draft. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/27/2007 00:28:13 MDTNo reproduction or networking permitted wi
21、thout license from IHS -,-,- 3.3 pre-strain, cP : The constant static strain to which the test piece is subjected during the test. NOTE - This may be used to simulate product requirements or simply to hold the test piece in the apparatus. 3.4 cyclic stress amplitude, tsa or ra : The ratio of the for
22、ce amplitude (cyclic force) superimposed upon the pre-strain or pre-stress to the appropriate dimension of the unstressed test piece. 3,5 cyclic strain amplitude, Q or ya : The ratio of the defor- mation amplitude (cyclic deformation) superimposed upon the pre-strain or pre-stress to the appropriate
23、 dimension of the unstrained test piece. NOTES 1 For certain flexometers, the cyclic strain amplitude has to be smaller than that of the pre-strain. 2) In a compression flexometer, the pre-stress, a, acts in the same direction as the cyclic strain amplitude, cae In a rotary flexometer, a cyclic shea
24、r strain a or cyclic shear stress r, acts at right angles to an axial compression pre-strain Cp or compression pre-stress op. 3.6 heat generation : The total heat generated in the test piece by energy absorption during the test. NOTE - This term should be distinguished from the deprecated, but somet
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