1、BRITISH STANDARD BS EN ISO 8256:2004 Plastics Determination of tensile-impact strength The European Standard EN ISO 8256:2004 has the status of a British Standard ICS 83.080.01 BS EN ISO 8256:2004 This British Standard was published under the authority of the Standards Policy and Strategy Committee
2、on 16 July 2004 BSI 16 July 2004 ISBN 0 580 44092 3 National foreword This British Standard is the official English language version of EN ISO 8256:2004. It is identical with ISO 8256:2004. It supersedes BS EN ISO 8256:1997 which is withdrawn. The UK participation in its preparation was entrusted to
3、 Technical Committee PRI/21, Testing of plastics, which has the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this docu
4、ment may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract.
5、 Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for ch
6、ange, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN ISO title page, the EN ISO foreword page, the ISO title page, pages ii to iv, pages 1
7、 to 16, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. Date Comments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 8256 July 2004 ICS 83.080.01 Supersedes
8、EN ISO 8256:1996 English version Plastics - Determination of tensile-impact strength (ISO 8256:2004) Plastiques - Dtermination de la rsistance au choc- traction (ISO 8256:2004) This European Standard was approved by CEN on 1 June 2004. CEN members are bound to comply with the CEN/CENELEC Internal Re
9、gulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This
10、 European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the official versions. CEN members are the
11、 national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom
12、. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 8256:2004: ENE I
13、S28 O4002:65 E() 2 Foreword This document (EN ISO 8256:2004) has been prepared by Technical Committee ISO/TC 61 “Plastics“ in collaboration with Technical Committee CEN/TC 249 “Plastics“, the secretariat of which is held by IBN. This European Standard shall be given the status of a national standard
14、, either by publication of an identical text or by endorsement, at the latest by January 2004, and conflicting national standards shall be withdrawn at the latest by January 2004. This document supersedes EN ISO 8256:1996. According to the CEN/CENELEC Internal Regulations, the national standards org
15、anizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
16、Slovenia, Spain, Sweden, Switzerland and United Kingdom. Endorsement notice The text of ISO 8256:2004 has been approved by CEN as EN ISO 8256:2004 without any modifications. ENISO8256:2004 Reference number ISO 8256:2004(E) OSI 4002INTERNATIONAL STANDARD ISO 8256 Second edition 2004-07-01 Plastics De
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22、4002 Allr ithgsr esedevrENISO8256:2004IS:6528 O4002(E) I SO 4002 All irthgs ersedevr iiiContents Page Foreword iv 1 Scope 1 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 Crosshead 3 5.4 Clamping devices/jaws. 3
23、5.5 Micrometers and gauges 3 6 Test specimens. 4 6.1 Shape and dimensions. 4 6.2 Preparation 6 6.3 Notching of specimens. 6 6.4 Number of test specimens . 6 6.5 Anisotropy. 6 6.6 Conditioning 7 7 Procedure. 7 8 Determination of energy corrections 8 8.1 Method A Correction E qdue to the plastic defor
24、mation and the kinetic energy of the crosshead 8 8.2 Method B Crosshead-bounce energy E b8 9 Calculation and expression of results 8 9.1 Calculation of corrected tensile-impact energy. 8 9.2 Calculation of tensile-impact strength 9 9.3 Statistical parameters. 9 9.4 Number of significant figures 9 10
25、 Precision 9 11 Test report 10 Annex A (normative) Determination of correction factor for method A . 11 Annex B (normative) Determination of bounce-correction factor for method B . 14 Bibliography . 16 ENISO8256:2004IS:6528 O4002(E) iv I SO 4002 All irthgs ersedevrForeword ISO (the International Org
26、anization 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 technical committee has been establi
27、shed 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 of electrotechnical standardizatio
28、n. 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 circulated to the member bodies for voting.
29、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 responsible for identifying any or all such pat
30、ent rights. ISO 8256 was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties. This second edition cancels and replaces the first edition (ISO 8256:1990), which has been technically revised. ENISO8256:2004INTENRATIONAL TSANDADR IS:6528 O4002(E)I SO 4002 All i
31、rthgs ersedevr 1Plastics Determination of tensile-impact strength 1 Scope 1.1 This International 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
32、 high strain rates. These methods can be used for rigid materials (as defined in ISO 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 specime
33、ns under specified impact velocities, and for estimating the brittleness or the toughness 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 pro
34、ducts (for example mouldings, laminates, or extruded or cast sheets). 1.4 Results obtained 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 dire
35、ctly from the material. Test results obtained from specimens prepared from moulding 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 c
36、omparable. 1.5 These methods are not suitable for use as a source of data for design 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 t
37、emperatures. The two different methods are suitable for production control as well as 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, t
38、he latest edition of the referenced document (including any amendments) applies. ISO 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 Determi
39、nation of Izod impact strength ISO 291, Plastics Standard atmospheres for conditioning 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 m
40、oulding of multipurpose and bar test specimens ISO 294-2, Plastics Injection moulding of test specimens of thermoplastic materials Part 2: Small tensile bars ENISO8256:2004IS:6528 O4002(E) 2 I SO 4002 All irthgs ersedevrISO 294-3, Plastics Injection moulding of test specimens of thermoplastic materi
41、als Part 3: Small plates ISO 295, Plastics Compression moulding of test specimens of thermosetting materials ISO 472, Plastics Vocabulary ISO 1268 (all parts), Fibre-reinforced plastics Methods of producing test plates ISO 2602, Statistical interpretation of tests results Estimation of the mean Conf
42、idence interval ISO 2818, Plastics Preparation of test specimens by machining ISO 3167, Plastics Multipurpose test specimens ISO 10350-1, Plastics Acquisition and presentation of comparable single-point data Part 1: Moulding materials ISO 11403-3, Plastics Acquisiton and presentation of comparable m
43、ultipoint data Part 3: Environmental influences on properties ISO 13802, Plastics Verification of pendulum impact-testing machines Charpy, Izod and tensile impact- testing 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 tensile-impact strengt
44、h of unnotched specimens a tUenergy absorbed in breaking an unnotched specimen under specified conditions, referred to the original cross- sectional area of the specimen NOTE It is expressed in kilojoules per square metre (kJ/m 2 ). 3.2 tensile-impact strength of notched specimens a tNenergy absorbe
45、d in breaking a notched specimen under specified conditions, referred to the original cross- sectional area of the specimen at the notch NOTE It is expressed in kilojoules per square metre (kJ/m 2 ). 4 Principle A specimen is broken by a single impact at the bottom of the swing of the pendulum of a
46、tensile-impact machine. The specimen is horizontal at the moment of rupture. One end of the specimen, at impact, is held either by the frame or the pendulum and the other end by the crosshead. The two methods described are based on two different ways of positioning the specimen held by the crosshead
47、: the specimen may be either mounted stationary on the support frame (method A) or carried downward together with the pendulum (method B). The energy to fracture is determined by the kinetic energy extracted from the pendulum in the process of breaking the specimen. Corrections are made for the ener
48、gy to toss (method A) or bounce (method B) the crosshead. ENISO8256:2004ISO 8256:2004(E) I SO 4002 All irthgs ersedevr 35 Apparatus 5.1 Test machine The principles, characteristics and verification of suitable test machines are detailed in ISO 13802. 5.2 Pendulum and striker 5.2.1 The pendulum shall
49、 be constructed of a single- or multiple-membered arm holding the head, in which the greatest mass is concentrated. A rigid pendulum is essential to maintain the proper clearances and geometric relationships between related parts and to minimize energy losses, which are always included in the measured impact-energy value. 5.2.2 The strikers for method A and method B are described in detail in ISO 13802
