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1、Reference number ISO 1922:2001(E) ISO 2001 INTERNATIONAL STANDARD ISO 1922 Third edition 2001-07-15 Rigid cellular plastics Determination of shear strength Plastiques alvolaires rigides Dtermination de la rsistance au cisaillement ISO 1922:2001(E) PDF disclaimer This PDF file may contain embedded ty
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4、timized 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 2001 All rights reserved. Unless otherwise specified,
5、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. ISO copyright office Case pos
6、tale 56 ? CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.ch Web www.iso.ch Printed in Switzerland ii ISO 2001 All rights reserved -,-,- ISO 1922:2001(E) ISO 2001 All rights reservediii ContentsPage Foreword.iv 1Scope 1 2Normative references1 3Principle1 4Apparatus
7、.1 5Test specimens3 6Number of test specimens3 7Conditioning and test temperature3 8Procedure.3 9Calculation and expression of results.4 10Precision and bias.4 11Test report5 Annex A (normative) Choice of adhesives for preparation of test specimens.6 ISO 1922:2001(E) iv ISO 2001 All rights reserved
8、Foreword 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 committees. Each member body interested in a subject for which a t
9、echnical 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 the International Electrotechnical Commission (IEC) on all matters
10、 of electrotechnical standardization. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard r
11、equires 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 International Standard may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. International St
12、andard ISO 1922 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics. This third edition cancels and replaces the second edition (ISO 1922:1981), which has been technically revised. Annex A forms a normative part of this International Standard. -,-,- INTERNA
13、TIONAL STANDARDISO 1922:2001(E) ISO 2001 All rights reserved1 Rigid cellular plastics Determination of shear strength 1Scope This International Standard specifies a method of determining the shear strength of rigid cellular plastics. It also provides for the optional determination of shear modulus.
14、2Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For dated references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreeme
15、nts based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For undated references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers
16、of currently valid International Standards. ISO 291:1997, Plastics Standard atmospheres for conditioning and testing. ISO 1923:1981, Cellular plastics and rubbers Determination of linear dimensions. 3Principle A shear stress is applied to a test specimen of defined shape by means of metal supports b
17、onded to the specimen. 4Apparatus 4.1Test machine The test machine (see Figure 1) shall be such that: a)a test specimen having the form and dimensions specified in clause 5 is held vertically between two fixing devices each comprising a metal support, one of these devices being fixed and the other m
18、ovable, and the stress being transmitted along the longitudinal axis of the specimen; b)the movable grip will be moved away from the fixed grip at a constant rate of (1?0,5) mm per minute in a direction parallel to the longitudinal axis of the specimen; c)the force exerted on the specimen shall be k
19、nown with a maximum error of 1 %, and the distance between the grips shall be known with a maximum error of 0,01 mm, by means of recording devices. 4.2Metal supports These shall consist of flat, rectangular-sectioned, mild-steel plates, machined on one side, with a thickness of (16?1) mm and a width
20、 of 1 0 50?mm. They shall be attached to the grips by the method shown in Figure 1. ISO 1922:2001(E) 2 ISO 2001 All rights reserved Dimensions in millimetres Key 1Fixed machine grip 2Universal-joint connection pins, allowing rotation about axis 3Tongue and groove 4Nut and bolt supports, ? 10 mm 5Ada
21、ptor 6Metal supports 7Test specimen 8Load-spreading plates measuring (50 ? 50 ? 5) mm 9Tongue and groove 10 Adaptor 11 Universal-joint connection pins, allowing rotation about axis 12 Movable machine grip Figure 1 Test assembly ISO 1922:2001(E) ISO 2001 All rights reserved3 The thickness of the adap
22、tors that connect the metal supports to the test machine grips shall be equal to the thickness of the test specimen. 4.3Adhesive The adhesive used to fix the metal supports to the test specimen shall be such that the shear strength and modulus of the adhesive film are significantly greater than that
23、 of the cellular material under test, so as to ensure ultimate failure in the cellular material rather than at the adhesive interface. The adhesive shall also be compatible with the material under test. Details of a suitable adhesive and the method of application are given in annex A. 5Test specimen
24、s 5.1The test specimens shall be right parallelepipeds of the following dimensions: a)length: 250 0 5? mm; b)width: 50 0 1? mm; c)thickness: (25?0,5) mm. The distance between two parallel surfaces shall not vary by more than 1 %. Measure the dimensions in accordance with the principles specified in
25、ISO 1923. 5.2Prepare test specimens without moulding skins. Machine their surfaces without modifying the original structure. Bond the two machined surfaces of the metal supports to the larger surfaces of the dust-free test specimens so that the edges of the two metal supports are parallel to each ot
26、her, as shown in Figure 1. 6Number of test specimens Test a set of five specimens. When testing materials suspected of being anisotropic, prepare sets of specimens having their major axes parallel with and normal to the suspected directions of anisotropy. Reject specimens that fail at the adhesive i
27、nterface before failure of the cellular material and test additional specimens so that the number of significant results is not less than five. 7Conditioning and test temperature Condition specimens immediately before testing for a period of not less than 16 h at a temperature of (23?2) C and at (50
28、?5) % relative humidity, in accordance with ISO 291. Conduct the test at a temperature of (23?2) C. 8Procedure Attach a test specimen to the grips of the test machine and apply a force by separating the movable grip from the fixed grip at a rate of (1?0,5) mm per minute, with a variation not greater
29、 than 10 % during the test. Record the force-deflection diagram. -,-,- ISO 1922:2001(E) 4 ISO 2001 All rights reserved Repeat the test on the remaining specimens. NOTEThe following procedure is suggested to correct for the force imposed on the specimen by the metal supports and their attachments: Be
30、fore attaching the test assembly to the machine attachments, adjust the test machine to zero force. If the force-measuring device is in the upper position, correct for the force exerted by one metal support and its attachments by determining their weight and subtracting it from the recorded force. I
31、f the force-measuring device is in the lower position, correct for the force imposed by one metal support and its attachments by determining their weight and and adding it to the recorded force. 9Calculation and expression of results 9.1Shear strength The shear strengthqof the specimen, expressed in
32、 kilopascals, is given by the equation m 1000F q lb ? ? ? where lis the initial length, in millimetres, of the specimen; bis the initial width, in millimetres, of the specimen; Fmis the maximum force, in newtons, applied to the specimen. 9.2Shear modulus If desired, calculate the shear modulusGof th
33、e specimen, in kilopascals, using the equation 1000 G lb ? ? ? where ?is the thickness, in millimetres, of the specimen; ?is the slope of the linear portion of the force-deflection diagram, expressed in newtons per millimetre; lis the initial length, in millimetres, of the specimen; bis the initial
34、width, in millimetres, of the specimen. 10 Precision and bias The precision of this method is unknown, and data obtained by the method shall not be used in resolving disputes between suppliers and users. -,-,- ISO 1922:2001(E) ISO 2001 All rights reserved5 11 Test report The test report shall includ
35、e the following particulars: a)a reference to this International Standard; b)all details necessary for complete identification of the material tested; c)where applicable, the direction of application of the force with respect to any anisotropy; d)the individual shear strength test results and the av
36、erage shear strength for each direction of test; e)if calculated, the individual shear modulus values and the average shear modulus values for each direction of test; f)the mode of failure; g)any deviation from the method specified, any operational details not specified in this International Standar
37、d, and any circumstances liable to have had an influence upon the results; h)the date of testing. ISO 1922:2001(E) 6 ISO 2001 All rights reserved Annex A (normative) Choice of adhesives for preparation of test specimens Experience has indicated that the uniformity of application of the adhesive laye
38、r, and to a lesser extent the amount of adhesive used, are critical. Sufficient time for the adhesive to cure shall be allowed, the test specimens being undisturbed during that period. The curing period may constitute part or the whole of the conditioning period. It has been found that satisfactory
39、results for most materials can be obtained using an epoxy-based adhesive applied to a uniform thickness. It has been found that satisfactory results for some materials can be obtained by: a)using a low-viscosity unsaturated-polyester adhesive, which may be applied by means of a small brush (for exam
40、ple a 25 mm paint brush); b)coating the surfaces to be bonded with the adhesive (the use of 5 g of adhesive for each surface is suggested); c)ensuring that the adhesive is applied within 15 min of mixing at (23?2) C; d)allowing at least 16 h for the adhesive to cure. -,-,- ISO 1922:2001(E) ICS 83.100 Price based on 6 pages ISO 2001 All rights reserved