1、BRITISH STANDARD BS EN ISO 179:1997 Incorporating Amendment Nos. 1 and 2 to BS 2782-3:Method 359:1993 (renumbersBS as BS EN ISO 179:1997) Plastics Determination of Charpy impact strength The European Standard EN ISO 179:1997 has the status of a British Standard IMPORTANT NOTICE. Before reading this
2、method it is essential to read BS2782-0 Introduction issued separately ICS 83.080.01BSENISO179:1997 This British Standard, having been prepared under the directionof the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15
3、 September 1993 BSI 09-1999 The following BSI references relate to the work on this standard: Committee reference PRM/21 Draft for comment 91/39455 DC ISBN 0 580 22539 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Plastics and Rubber
4、 Standards Policy Committee (PRM/-) to Technical Committee PRM/21, upon which the following bodies were represented: British Plastics Federation British Textile Confederation Department of the Environment (Building Research Establishment) Department of Trade and Industry (National Physical Laborator
5、y) Electrical and Electronic Insulation Association (BEAMA Ltd.) GAMBICA (BEAMA Ltd.) Institute of Materials Ministry of Defence Packaging and Industrial Films Association Pira International RAPRA Technology Ltd. Amendments issued since publication Amd. No. Date Comments 8060 February 1994 8643 Augu
6、st 1997 Indicated by a sideline in the marginBSENISO179:1997 BSI 09-1999 i Contents Page Committees responsible Inside front cover National foreword ii Foreword 2 1 Scope 3 2 Normative references 3 3 Definitions 4 4 Principle 4 5 Apparatus 4 6 Test specimens 5 7 Procedure 8 8 Calculation and express
7、ion of results 8 9 Precision 9 10 Test report 9 Annex A (informative) Additional methods for testing the influence of surface effects 13 Annex ZA (normative) Normative references to international publications with their relevant European publications 13 Figure 1 Striking edge and support blocks for
8、type 1 test specimens 10 Figure 2 Charpy edgewise impact (e), with single notched specimen 11 Figure 3 Charpy flatwise impact (f) 11 Figure 4 Notch types 11 Figure 5 Scheme of designations describing the direction of blow 12 Figure A.1 Charpy flatwise impact (f) with double-notched specimen 13 Table
9、 1 Characteristics of pendulum impact testing machines 4 Table 2 Specimen types, dimensions and span 5 Table 3 Method designations, specimen types, notch type and notch dimensions Materials not exhibiting interlaminar shear fracture 6 Table 4 Method designations, specimen types, notch types and notc
10、h dimensions Materials exhibiting interlaminar shear fracture 7 Table A.1 Parameters for tests on double-notched specimens 13 List of references Inside back coverBSENISO179:1997 ii BSI 09-1999 National foreword This British Standard method has been prepared by Technical Committee PRI/21 (formerly PR
11、M/21) and is the English language version of EN ISO179: Plastics Determination of Charpy impact strength, published by the European Committee for Standardization (CEN). It is identical with ISO179:1993 published by the International Organization for Standardization (ISO). It supersedes BS2782-3:Meth
12、od 359:1984 which is withdrawn. Revisions of ISO294 and ISO2818 are currently in preparation. When these are published it is envisaged that they will be implemented as dual-numbered revisions of BS2782-9:Method 910A and BS2782-9:Method 930A, respectively. WARNING NOTE. This British Standard, which i
13、s identical with ISO179, does not necessarily detail all the precautions necessary to meet the requirements of the Health and Safety at Work etc. Act 1974. Attention should be paid to any appropriate safety precautions and the method should be operated only by trained personnel. A British Standard d
14、oes not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Cross-references International Standard Corresponding British
15、 Standard BS 2782 Methods of testing plastics ISO 291:1977 Part 0:1992 Introduction (Appendix A is identical) ISO 293:1986 Method 901A:1988 Compression moulding test specimens of thermoplastic material (Identical) ISO 295:1991 Method 902A:1992 Compression moulding of test specimens of thermosetting
16、materials (Identical) ISO 1268:1974 Method 920A to 920C:1977 Preparation of glass fibre reinforced, resin bonded, low-pressure laminated plates or panels for test purposes (Identical) ISO 2557-1:1989 Method 940A:1990 Preparation of test specimens of amorphous thermoplastics in the form of bars with
17、a specified reversion (Identical) ISO 2557-2:1986 Method 940B:1989 Preparation of test specimens of amorphous thermoplastics with a specified reversion by injection moulding rectangular plates (Identical) ISO 2602:1980 BS 2846 Guide to statistical interpretation of data Part 2:1981 Estimation of the
18、 mean: confidence interval (Identical) ISO 3167:1993 BS 2782 Methods of testing plastics Method 931A:1993 Preparation and use of multipurpose test specimens (Identical) Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN ISO title page, pages 2 to 14,
19、 an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on theinside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 179 December 1996 ICS 83.080 Descripto
20、rs: Plastics, rigid plastics, tests, Charpy impact tests, test equipment, test specimens, specimen preparation English version Plastics Determination of Charpy impact strength (ISO 179:1993) Plastiques Dtermination de la rsistance au choc Charpy (ISO 179:1993) Kunststoffe Bestimmung der Charpy-Schla
21、gzhigkeit (ISO 179:1993) This European Standard was approved by CEN on1994-12-14. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and
22、bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibili
23、ty 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 national standards bodies of Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portu
24、gal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN ISO 179:1996 EENISO179:1996 BSI 09-
25、1999 2 Foreword The text of the International Standard from Technical Committee ISO/TC61 “Plastics” of the International Organization for Standardization (ISO) has been taken over as an European Standard by Technical Committee CEN/TC249 “Plastics”, the secretariat of which is held by IBN. This Europ
26、ean Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by June1997, and conflicting national standards shall be withdrawn at the latest by June1997. According to CEN/CENELEC Internal Regulations, the national standar
27、ds organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom. Endorsement notice The text o
28、f the International Standard ISO179:1993 has been approved by CEN as a European Standard without any modification. NOTENormative references to International Standards are listed in Annex ZA (normative).ENISO179:1996 BSI 09-1999 3 1 Scope 1.1 This International Standard specifies a method for determi
29、ning the Charpy impact strength of plastics under defined conditions. A number of different types of specimen and test configurations are defined. Different test parameters are specified according to the type of material, the type of test specimen and the type of notch. 1.2 The method is used to inv
30、estigate the behaviour of specified types of specimen under the impact conditions defined and for estimating the brittleness or toughness of specimens within the limitations inherent in the test conditions. The method has a greater range of applicability than that given in ISO180 (lzod) 1)and is mor
31、e suitable for the testing of materials showing interlaminar shear fracture or of materials exhibiting surface effects due to environmental factors. 1.3 The method is suitable for use with the following range of materials: rigid thermoplastics moulding and extrusion materials, including filled and r
32、einforced compounds in addition to unfilled types; rigid thermoplastics sheets; rigid thermosetting moulding materials, including filled and reinforced compounds; rigid thermosetting sheets, including laminates; fibre-reinforced thermoset and thermoplastics composites incorporating unidirectional or
33、 non-unidirectional reinforcements such as mat, woven fabrics, woven rovings, chopped strands, combination and hybrid reinforcements, rovings and milled fibres; sheets made from pre-impregnated materials (prepregs); thermotropic liquid-crystal polymers. The method is not normally suitable for use wi
34、th rigid cellular materials and sandwich structures containing cellular material. Also, notched specimens are not normally used for long-fibre-reinforced composites or for thermotropic liquid-crystal polymers. 1.4 The method is adapted to the use of specimens which may be either moulded to the chose
35、n dimensions, machined from the central portion of a standard multipurpose test specimen (seeISO3167) or machined from finished and semifinished products such as mouldings, laminates and extruded or cast sheet. 1.5 The method specifies preferred dimensions for the test specimen. Tests which are carr
36、ied out on specimens of different dimensions and notches, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors, such as the energy capacity of the pendulum, its impact velocity and the conditioning of the specimens can also influe
37、nce the results. Consequently, when comparative data are required, these factors must be carefully controlled and recorded. 1.6 The method should not be used as a source of data for design calculations of components. Information on the typical behaviour of a material can be obtained, however, by tes
38、ting at different temperatures, by varying the notch radius and/or the thickness and by testing specimens prepared under different conditions. 2 Normative references The following standards contain provisions which, through reference in this text, constitute provisions of this International Standard
39、. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below. Members of IEC a
40、nd ISO maintain registers of currently valid International Standards. ISO 291:1977, Plastics Standard atmospheres for conditioning and testing. ISO 293:1986, Plastics Compression moulding test specimens of thermoplastic materials. ISO 294:, Plastics Injection moulding of test specimens of thermoplas
41、tic materials 2) . ISO 295:1991, Plastics Compression moulding of test specimens of thermosetting materials. ISO 1268:1974, Plastics Preparation of glass fibre reinforced, resin bonded, low-pressure laminated plates or panels for test purposes. ISO 2557-1:1989, Plastics Amorphous thermoplastics Prep
42、aration of test specimens with a specified maximum reversion Part 1: Bars. ISO 2557-2:1986, Plastics Amorphous thermoplastics Preparation of test specimens with a specified reversion Part 2: Plates. ISO 2602:1980, Statistical interpretation of test results Estimation of the mean Confidence interval.
43、 1) ISO 180:1993, Plastics Determination of lzod impact strength. 2) To be published. (Revision of ISO 294:1975)ENISO179:1996 4 BSI 09-1999 ISO 2818:, Plastics Preparation of test specimens by machining 3) . ISO 3167:, Plastics Multipurpose test specimens 4) . 3 Definitions For the purposes of this
44、International Standard, the following definitions apply. 3.1 charpy impact strength of unnotched specimens a cU impact energy absorbed in breaking an unnotched specimen, referred to the original cross-sectional area of the specimen it is expressed in kilojoules per square metre (kJ/m 2 ) 3.2 charpy
45、impact strength of notched specimensa cN impact energy absorbed in breaking a notched specimen, referred to the original cross-sectional area of the specimen at the notch, where N = A, B or C depending on the notch type (see6.3.1.1.2) it is expressed in kilojoules per square metre (kJ/m 2 ) 3.3 edge
46、wise impact (e) direction of blow parallel to the dimension b, with impact on the narrow longitudinal surface h l of the specimen (seeFigure 1, left, andFigure 2 andFigure 5) 3.4 flatwise impact (f) direction of blow parallel to the dimension h, with impact on the broad longitudinal surface b l of t
47、he specimen (seeFigure 1, right, andFigure 3 andFigure 5) 3.5 normal impact (n) direction of blow normal to the plane of reinforcement (seeFigure 5) it is used for laminar-type reinforced plastics 3.6 parallel impact (p) direction of blow parallel to the plane of reinforcement (seeFigure 5) 4 Princi
48、ple The test specimen, supported as a horizontal beam, is broken by a single swing of a pendulum, with the line of impact midway between the supports. In the case of edgewise impact with notched specimens, the line of impact is directly opposite the single notch (seeFigure 1, left, andFigure 5). 5 A
49、pparatus 5.1 Testing machine 5.1.1 The testing machine shall be of the pendulum type and shall be of rigid construction. It shall be capable of measuring the impact energy, W, absorbed in breaking a test specimen. The value of this energy is defined as the difference between the initial energy, E, of the pendulum and the energy remaining in the pendulum after breaking the test specimen. The energy shall be accurately corrected for losses due to friction and air resistance (seeTable 1 and7.4
