1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 1922:2012Rigid cellular plastics Determination of shearstrengthBS ISO 1922:2012 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 1922
2、:2012.It supersedes BS ISO 1922:2001 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee PRI/24, Testing of rigid and flexible cellular materials. A list of organizations represented on this committee can beobtained on request to its secretary.This publicat
3、ion does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2012. Published by BSI StandardsLimited 2012 ISBN 978 0 580 58100 7 ICS 83.080.01; 83.100 Compliance with a British Standard cannot confer im
4、munity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 August 2012. Amendments issued since publicationDate T e x t a f f e c t e dBS ISO 1922:2012 ISO 2012Rigid cellular plastics Determination of shear strengthPlastiq
5、ues alvolaires rigides Dtermination de la rsistance au cisaillementINTERNATIONAL STANDARDISO1922Fourth edition2012-08-01Reference numberISO 1922:2012(E)BS ISO 1922:2012ISO 1922:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified,
6、 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 officeCase post
7、ale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 1922:2012ISO 1922:2012(E) ISO 2012 All rights reserved iiiContents PageForeword iv1 Scope 12 Normative references . 13 Principle . 14 Apparatus 14.1 Test machine .
8、14.2 Metal supports . 14.3 Adhesive 35 Test specimens 36 Number of test specimens 37 Conditioning and test temperature and humidity . 38 Procedure 39 Calculation and expression of results . 49.1 Shear strength 49.2 Shear modulus . 410 Precision and bias . 411 Test report . 4BS ISO 1922:2012ISO 1922:
9、2012(E)ForewordISO (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 whi
10、ch a technical 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 m
11、atters of electrotechnical standardization.International Standards are drafted in accordance with the rules 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 circu
12、lated to the member bodies for voting. Publication as an International Standard requires 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 document may be the subject of patent rights. ISO shall not be held responsib
13、le for identifying any or all such patent rights.ISO 1922 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 10, Cellular plastics.This fourth edition cancels and replaces the third edition (ISO 1922:2001), of which it constitutes a minor revision to amend Clause 7, which conce
14、rns conditioning and test temperatures and humidities.iv ISO 2012 All rights reservedBS ISO 1922:2012INTERNATIONAL STANDARD ISO 1922:2012(E)Rigid cellular plastics Determination of shear strength1 ScopeThis International Standard specifies a method of determining the shear strength of rigid cellular
15、 plastics. It also provides for the optional determination of shear modulus.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referen
16、ced document (including any amendments) applies.ISO 1923, Cellular plastics and rubbers Determination of linear dimensions3 PrincipleA shear stress is applied to a test specimen of defined shape by means of metal supports bonded to the specimen.4 Apparatus4.1 Test machineThe test machine (see Figure
17、 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 movable, and the stress being transmitted along the longitudinal axis of the sp
18、ecimen;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 known with a maximum error of 1 %, and the distance between the grips shall be
19、known with a maximum error of 0,01 mm, by means of recording devices.4.2 Metal supportsThese shall consist of flat, rectangular-section, mild-steel plates, machined on one side, with a thickness of (16 1) mm and a width of 5001+mm.They shall be attached to the grips by the method shown in Figure 1.T
20、he thickness of the adaptors that connect the metal supports to the test machine grips shall be equal to the thickness of the test specimen. ISO 2012 All rights reserved 1BS ISO 1922:2012ISO 1922:2012(E)Dimensions in millimetresKey1 fixed machine grip 7 test specimen2 universal-joint connection pins
21、, allowing rotation about axis 8 load-spreading plates measuring (50 50 5) mm3 tongue and groove 9 tongue and groove4 nut and bolt supports, 10 mm 10 adaptor5 adaptor 11 universal-joint connection pins, allowing rotation about axis6 metal supports 12 movable machine gripFigure 1 Test assembly2 ISO 2
22、012 All rights reservedBS ISO 1922:2012ISO 1922:2012(E)4.3 AdhesiveThe 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 of the cellular material under test, so as to ensure ultimate
23、 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.5 Test specimens5.1 The test specimens shall be right parallelepipeds of the
24、following dimensions:length: 25050mm;width: 5010mm;thickness: (25 0,5) mmThe distance between two parallel surfaces shall not vary by more than 1 %.Measure the dimensions in accordance with the principles specified in ISO 1923.5.2 Prepare test specimens without moulding skins. Machine their surfaces
25、 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 other, as shown in Figure 1.6 Number of test specimensTest a set of five specimens. W
26、hen 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 interface before failure of the cellular material and test additional specimens so tha
27、t the number of significant results is not less than five.7 Conditioning and test temperature and humidityCondition the test specimens for a minimum of 16 h under one of the sets of conditions shown below.(23 2) C and (50 10) % relative humidityor(23 5) C and 50+1020% relative humidityor(27 5) C and
28、 65+1020% relative humidityCarry out the test at the same temperature and humidity as were used for conditioning.8 ProcedureAttach 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 variatio
29、n not greater than 10 % during the test.Record the force-deflection diagram. ISO 2012 All rights reserved 3BS ISO 1922:2012ISO 1922:2012(E)Repeat the test on the remaining specimens.NOTE The following procedure is suggested to correct for the force imposed on the specimen by the metal supports and t
30、heir attachments: Before 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 t
31、he recorded force. If 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 adding it to the recorded force.9 Calculation and expression of results9.1 Shear strengthThe shear strength q of the speci
32、men, expressed in kilopascals, is given by the equationqFlb=1000mwherel is the initial length, in millimetres, of the specimen;b is the initial width, in millimetres, of the specimen;Fm is the maximum force, in newtons, applied to the specimen.9.2 Shear modulusIf desired, calculate the shear modulus
33、 G of the specimen, in kilopascals, using the equationGlb=1000 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;l is the initial length, in millimetres, of the specimen;b is the initial wi
34、dth, in millimetres, of the specimen.10 Precision and biasThe precision of this method is unknown, and data obtained by the method shall not be used in resolving disputes between suppliers and users.11 Test reportThe test report shall include the following particulars:a) a reference to this Internat
35、ional Standard;b) all details necessary for complete identification of the material tested;4 ISO 2012 All rights reservedBS ISO 1922:2012ISO 1922:2012(E)c) where applicable, the direction of application of the force with respect to any anisotropy;d) the individual shear strength test results and the
36、 average 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 Stan
37、dard, and any circumstances liable to have had an influence upon the results;h) the date of testing. ISO 2012 All rights reserved 5BS ISO 1922:2012ISO 1922:2012(E) ISO 2012 All rights reservedICS 83.100Price based on 5 pagesThis page deliberately left blankBSI is the independent national body respon
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