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1、 Reference number ISO 132:2005(E) ISO 2005 INTERNATIONAL STANDARD ISO 132 Fourth edition 2005-10-15 Rubber, vulcanized or thermoplastic Determination of flex cracking and crack growth (De Mattia) Caoutchouc vulcanis ou thermoplastique Dtermination de la rsistance au dveloppement dune craquelure (De
2、Mattia) Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) PDF disclaimer This PDF
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5、F-creation parameters were 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. ISO 2005 All rights reserved.
6、 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 requester.
7、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 2005 All rights reserved Copyright International Organization for Standardization Provided by IHS under license with ISO License
8、e=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) ISO 2005 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references. 1 3 Apparatus 1 4 Test p
9、ieces 2 4.1 Shape, dimensions and preparation. 2 4.2 Preparation of test pieces for cut growth measurement 3 4.3 Time interval between vulcanization and testing 3 4.4 Conditioning 3 4.5 Number of test pieces 5 5 Test conditions . 5 5.1 Temperature 5 5.2 Humidity. 5 6 Procedure 5 6.1 General. 5 6.2 D
10、etermination of flex cracking 5 6.3 Determination of crack growth 6 7 Expression of results . 6 7.1 Determination of flex cracking 6 7.2 Determination of crack growth 7 8 Precision 7 9 Test report . 7 Copyright International Organization for Standardization Provided by IHS under license with ISO Lic
11、ensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) iv ISO 2005 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of nat
12、ional 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. Interna
13、tional 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 r
14、ules 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 a
15、t 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 132 was prepared by Technical Committee ISO/TC
16、45, Rubber and rubber products, Subcommittee SC 2, Testing and analysis. This fourth edition cancels and replaces the third edition (ISO 132:1999), of which it constitutes a minor revision the main purpose of which was to update the normative references clause. Copyright International Organization f
17、or Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) ISO 2005 All rights reserved v Introduction Repeated bending or flexi
18、ng of a rubber causes cracks to develop in that part of the surface where tension stress is set up during flexing or, if this part of the surface contains a crack, causes this crack to extend in a direction perpendicular to the stress. Certain soft vulcanizates, for instance those prepared from styr
19、ene- butadiene rubber, show marked resistance to crack initiation, but it is possible for these vulcanizates to have a low resistance to growth (propagation) of cracks. It is important, therefore, to measure both the resistance to crack initiation by flexing and the resistance to crack propagation.
20、The method is suitable for rubbers that have reasonably stable stress-strain properties, at least after a period of cycling, and do not show undue stress softening or set, or highly viscous behaviour. The results obtained for some thermoplastic rubbers should be treated with caution if the elongatio
21、n at yield is below, or close to, the maximum strain imposed during the test. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted
22、without license from IHS -,-,- Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- INTERNATIONAL ST
23、ANDARD ISO 132:2005(E) ISO 2005 All rights reserved 1 Rubber, vulcanized or thermoplastic Determination of flex cracking and crack growth (De Mattia) WARNING Persons using this International Standard should be familiar with normal laboratory practice. This standard does not purport to address all of
24、 the safety problems, if any, associated with its use. It is the responsibility of the user to establish appropriate safety and health practices and to ensure compliance with any national regulatory conditions. 1 Scope This International Standard specifies a method of test intended for use in compar
25、ing the resistance of rubbers to the formation and growth of cracks, when subjected to repeated flexing on the De Mattia type machine. For determination of crack growth, an artificial cut is made in the test piece to initiate cut growth. 2 Normative references The following referenced documents are
26、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 23529, Rubber General procedures for preparing and conditioning test pieces for phys
27、ical test methods 3 Apparatus 3.1 De Mattia type machine, the essential features of which are as follows: The machine has stationary parts, provided with grips for holding one end of each of the test pieces in a fixed position, and similar but reciprocating parts for holding the other end of each of
28、 the test pieces. The travel is 0,5 0 57+mm and is such that the maximum distance between each set of opposing grips is 1 0 75+mm (see Figure 1). The reciprocating parts are so arranged that their motion is straight and in the direction of, and in the same plane as, the common centreline of each opp
29、osing pair of grips. The planes of the gripping surfaces of each opposing pair of grips remain parallel throughout the motion. The eccentric which actuates the reciprocating parts is driven by a constant-speed motor to give 5,00 Hz 0,17 Hz, with sufficient power to flex at least six, and preferably
30、twelve, test pieces at one test. The grips hold the test pieces firmly, without undue compression, and enable individual adjustment to be made to the test pieces to ensure accurate insertion. It is useful to arrange the test pieces in two equal groups, so that one group is being flexed while the oth
31、er group is being straightened, thus reducing the vibration in the machine. For testing at elevated or subnormal temperatures, the machine may be enclosed in a chamber with temperature control near the centre of the test piece to 2 C, if necessary, by using an air circulator. 3.2 Piercing tool and s
32、uitable jig, for piercing the test pieces (see 4.2). Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS
33、-,-,- ISO 132:2005(E) 2 ISO 2005 All rights reserved Dimensions in millimetres Key 1 upper grip 2 lower grip a Travel. Figure 1 De Mattia type machine 4 Test pieces 4.1 Shape, dimensions and preparation Each test piece shall be a strip with a moulded groove, as shown in Figure 2. The strips may be m
34、oulded individually in a multiple-cavity mould or may be cut from a wide slab having a moulded groove. The groove in the test piece shall have a smooth surface and be free from irregularities from which cracks may start prematurely. The groove shall be moulded into the test piece or slab by a half-r
35、ound ridge in the centre of the cavity. The half-round ridge shall have a radius of 2,38 mm 0,03 mm. The moulded groove shall be perpendicular to the direction of calendering. Results may be compared only between test pieces having thicknesses, measured close to the groove, which are within the tole
36、rances, because the results of the test are dependent upon the thickness of the test piece. If finished products are to be tested, test pieces without a groove can be used. They shall be prepared in accordance with ISO 23529. Cracks shall not be assessed on surfaces that have been cut or buffed. The
37、 use of test pieces cut and/or buffed from finished products shall be stated in the test report. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or ne
38、tworking permitted without license from IHS -,-,- ISO 132:2005(E) ISO 2005 All rights reserved 3 Dimensions in millimetres Figure 2 Test piece 4.2 Preparation of test pieces for crack growth measurement Each test piece shall be prepared by piercing the bottom of the groove at a point equidistant fro
39、m the sides, using a suitable jig. The piercing tool shall conform to the dimensions given in Figure 3. The piercing tool shall be maintained perpendicular to both the transverse and longitudinal axes, and the cut accomplished by a single insertion and withdrawal of the tool. The cut shall be parall
40、el to the longitudinal axis of the groove. Lubrication with water containing a suitable wetting agent may be used. A suitable jig shall be provided to hold the cutting tool; the exact details are not specified but the principles of operation shall be as follows: The test piece shall be held flat in
41、a solid support. The cutting tool shall be normal to the support and placed centrally with respect to the groove in the test piece, with the cutting edge of the piercing tool parallel to the axis of the groove. Means shall be provided for passing the piercing tool through the entire thickness of the
42、 rubber, and the support shall have a hole of a size just sufficient to permit the piercing tool to project through the base of the test piece to not less than 2,5 mm and not more than 3 mm. 4.3 Time interval between vulcanization and testing For all test purposes, the minimum time between vulcaniza
43、tion and testing shall be 16 h in accordance with ISO 23529. For non-product tests, the maximum time between vulcanization and testing shall be 4 weeks and, for evaluations intended to be comparable, the tests shall, as far as possible, be carried out after the same time interval. As far as possible
44、, samples and test pieces shall be kept away from exposure to light. 4.4 Conditioning For tests under standard laboratory conditions (see Clause 5), individually moulded test pieces shall be conditioned under the test conditions during a period of time in accordance with ISO 23529 immediately before
45、 testing. Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) 4 ISO 2005 All rights
46、 reserved Slab samples shall be similarly conditioned before the test pieces are cut. These test pieces may be either tested immediately or kept at the test temperature until tested. For tests at other temperatures (see Clause 5), after the conditioning period specified above the test pieces shall b
47、e brought to the test temperature by keeping in a chamber at this temperature for 3 h, then tested immediately (see ISO 23529). The same test temperature shall be used throughout any test or series of tests intended to be comparable. Dimensions in millimetres Key 1 test piece Figure 3 Piercing tool
48、Copyright International Organization for Standardization Provided by IHS under license with ISO Licensee=NASA Technical Standards 1/9972545001 Not for Resale, 04/20/2007 07:59:55 MDTNo reproduction or networking permitted without license from IHS -,-,- ISO 132:2005(E) ISO 2005 All rights reserved 5 4.5 Number of test pieces At least three, and preferably six, test pieces from each r