ISO-8256-2004.pdf
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1、 Reference number ISO 8256:2004(E) ISO 2004 INTERNATIONAL STANDARD ISO 8256 Second edition 2004-07-01 Plastics Determination of tensile-impact strength Plastiques Dtermination de la rsistance au choc-traction Provided by IHS under license with ISO ISO 8256:2004(E) PDF disclaimer This PDF file may co
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4、arameters 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 2004 All rights reserved. Unless othe
5、rwise 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. ISO copyrigh
6、t 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 2004 All rights reserved Provided by IHS under license with ISO -,-,- ISO 8256:2004(E) ISO 2004 All rights reserved iii Contents Page Forewo
7、rdiv 1 Scope1 2 Normative references .1 3 Terms and definitions.2 4 Principle.2 5 Apparatus.3 5.1 Test machine .3 5.2 Pendulum and striker .3 5.3 Crosshead3 5.4 Clamping devices/jaws.3 5.5 Micrometers and gauges3 6 Test specimens .4 6.1 Shape and dimensions.4 6.2 Preparation 6 6.3 Notching of specim
8、ens.6 6.4 Number of test specimens.6 6.5 Anisotropy .6 6.6 Conditioning7 7 Procedure.7 8 Determination of energy corrections8 8.1 Method A Correction Eq due to the plastic deformation and the kinetic energy of the crosshead 8 8.2 Method B Crosshead-bounce energy Eb8 9 Calculation and expression of r
9、esults8 9.1 Calculation of corrected tensile-impact energy.8 9.2 Calculation of tensile-impact strength9 9.3 Statistical parameters.9 9.4 Number of significant figures9 10 Precision9 11 Test report10 Annex A (normative) Determination of correction factor for method A .11 Annex B (normative) Determin
10、ation of bounce-correction factor for method B.14 Bibliography .16 Provided by IHS under license with ISO ISO 8256:2004(E) iv ISO 2004 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
11、 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. International organizations, governmental and non-gove
12、rnmental, 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 rules given in the ISO/IEC Directives, Part 2. T
13、he 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 at least 75 % of the member bodies casting a vot
14、e. 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 8256 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical pr
15、operties. This second edition cancels and replaces the first edition (ISO 8256:1990), which has been technically revised. Provided by IHS under license with ISO INTERNATIONAL STANDARD ISO 8256:2004(E) ISO 2004 All rights reserved 1 Plastics Determination of tensile-impact strength 1 Scope 1.1 This I
16、nternational Standard specifies two methods (method A and method B) for the determination of the tensile-impact strength of plastics under defined conditions. The tests can be described as tensile tests at relatively high strain rates. These methods can be used for rigid materials (as defined in ISO
17、 472), but are especially useful for materials too flexible or too thin to be tested with impact tests conforming to ISO 179 or ISO 180. 1.2 These methods are used for investigating the behaviour of specified specimens under specified impact velocities, and for estimating the brittleness or the toug
18、hness of specimens within the limitations inherent in the test conditions. 1.3 These methods are applicable both to specimens prepared from moulding materials and to specimens taken from finished or semi-finished products (for example mouldings, laminates, or extruded or cast sheets). 1.4 Results ob
19、tained by testing moulded specimens of different dimensions may not necessarily be the same. Equally, specimens cut from moulded products may not give the same results as specimens of the same dimensions moulded directly from the material. Test results obtained from specimens prepared from moulding
20、compounds cannot be applied directly to mouldings of any given shape, because values may depend on the design of the moulding and the moulding conditions. Results obtained by method A and method B may or may not be comparable. 1.5 These methods are not suitable for use as a source of data for design
21、 calculations on components. Information on the typical behaviour of a material can be obtained, however, by testing different types of test specimen prepared under different conditions, and by testing at different temperatures. The two different methods are suitable for production control as well a
22、s for quality control. 2 Normative references The 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 referenced document (including any amendments) applies. ISO
23、 179-1, Plastics Determination of Charpy impact properties Part 1: Non-instrumented impact test ISO 179-2, Plastics Determination of Charpy impact properties Part 2: Instrumented impact test ISO 180, Plastics Determination of Izod impact strength ISO 291, Plastics Standard atmospheres for conditioni
24、ng and testing ISO 293, Plastics Compression moulding of test specimens of thermoplastic materials ISO 294-1, Plastics Injection moulding of test specimens of thermoplastic materials Part 1: General principles, and moulding of multipurpose and bar test specimens ISO 294-2, Plastics Injection mouldin
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