BS EN 13421-2006 Plastics - Thermoset moulding compounds - Composites and reinforcement fibres - Preparation of specimens for determining the anisotropy of the properties of compre.pdf

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1、BRITISH STANDARDBS EN 13421:2006Plastics Thermoset moulding compounds Composites and reinforcement fibres Preparation of specimens for determining the anisotropy of the properties of compression moulding composites The European Standard EN 13421:2006 has the status of a British StandardICS 83.120g49

2、g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 13421:2006This British Standard was published under the authority of the Standards Policy and Str

3、ategy Committee on 31 March 2006 BSI ISBN 0 580 48012 7National forewordThis British Standard is the official English language version of EN 13421:2006.The UK participation in its preparation was entrusted to Technical Committee PRI/42, Fibre reinforced thermosetting plastics and prepregs, which has

4、 the responsibility to: A list of organizations represented on this committee can be obtained on request to its secretary.Cross-referencesThe British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section enti

5、tled “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. Users are responsible for its correct application. Compliance

6、 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 change, and keep UK interests informed; monitor related internat

7、ional and European developments and promulgate them in the UK.Summary of pagesThis document comprises a front cover, an inside front cover, the EN title page, pages 2 to 8, an inside back cover and a back cover.The BSI copyright notice displayed in this document indicates when the document was last

8、issued.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13421February 2006ICS 83.120English VersionPlastics - Thermoset moulding compounds - Composites andreinforcement fibres - Preparation of specimens for determiningthe anisotropy of the pr

9、operties of compression mouldingcompositesPlastiques - Compositions de moulage thermodurs -Composites et fibres de renfort - Prparation desprouvettes pour dterminer lanisotropie des propritsdes composites de moulage par compressionKunststoffe - Duroplast-Formmassen - Verbundwerkstoffeund Verstrkungs

10、fasern - Herstellung von Probekrpern zurBestimmung der Anisotropie der Eigenschaften vonverpressten FormmassenThis European Standard was approved by CEN on 30 December 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this Europe

11、anStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, Fre

12、nch, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republi

13、c, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMAL

14、ISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13421:2006: EEN 13421:2006 (E) 2 Contents Page Foreword. 3 Introduction 4 1 Scope 5 2 No

15、rmative references 5 3 Terms and definitions . 5 4 Health and safety. 5 5 Principle 6 6 Plate dimensions . 6 7 Procedure. 6 8 Manufacturing report 6 9 Precision. 6 Bibliography . 8 EN 13421:2006 (E) 3 Foreword This European Standard (EN 13421:2006) has been prepared by Technical Committee CEN/TC 249

16、 “Plastics”, the secretariat of which is held by IBN/BIN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by August 2006, and conflicting national standards shall be withdrawn at the latest by August

17、 2006. According to the CEN/CENELEC Internal Regulations, the national standards organizations 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, Lat

18、via, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 13421:2006 (E) 4 Introduction The main advantage of fibre reinforced moulding composite like SMC/BMC and GMT/LFT is their ability to carry even lon

19、ger reinforcing fibres to all parts of the mould during compression moulding. This material flow causes fibre orientation in the moulding and as a consequence an anisotropy of the properties. To provide engineers with suitable data for designing new mouldings the knowledge of the anisotropy received

20、 under defined moulding conditions is essential. In practice the mould coverage of those composites is in the range of 25 % to 30 % therefore the necessary test plates for preparing test specimens by machining needs to be manufactured under comparable conditions. For both composites this supposition

21、 is fulfilled in their European Standards for the preparation of test plates to determine flowability. Therefore these test plates can also be used for the preparation of specimens for determining the anisotropy of the composites to be tested. No special procedure to manufacture test plates has to b

22、e given in this European Standard. EN 13421:2006 (E) 5 1 Scope This European Standard specifies a method for the preparation of specimens of compression moulding composites for determining the anisotropy induced by material flow. It is applicable to all SMC/BMC and GMT/LFT composites, which are bein

23、g moulded under defined moulding conditions as described in EN ISO 12115 and ISO 1268-9. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For dated references, only the edition cited applies. For undated references, the latest

24、 edition of the referenced document (including any amendments) applies. EN ISO 472:2001, Plastics - Vocabulary (ISO 472:1999) EN ISO 527-4, Plastics Determination of tensile properties Part 4: Test conditions for isotropic and orthotropic fibre-reinforced plastic composites (ISO 527-4:1997) EN ISO 2

25、818, Plastics Preparation of test specimens by machining (ISO 2818:1994) 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN ISO 472:2001 and the following apply. 3.1 Sheet Moulding Compound - SMC product composed of thoroughly mixed resins and c

26、hopped or un-chopped reinforcing fibres, with or without particulate fillers, produced in sheet form 3.2 Bulk Moulding Compound - BMC product composed of thoroughly mixed resins and chopped reinforcing fibres, with or without particulate fillers, supplied in mass form 3.3 GMT/STC compounds of glass

27、mat reinforced thermoplastics 3.4 LFT compounds of glass reinforced thermoplastics by direct moulding 3.5 flow induced anisotropy isotropy caused by material flow of fibre reinforced compounds during moulding 4 Health and safety This European Standard limits itself to describing the preparation of c

28、ompression moulded test plates. The handling conditions of the products and materials used shall comply with the national regulations in force in each country and the staff shall be informed of the risks involved and appropriate precautions taken. EN 13421:2006 (E) 6 5 Principle To receive comparabl

29、e data the specimens are being machined out of the flow areas of test plates which been manufactured under defined moulding conditions (see EN ISO 12115, ISO 1268-9 and Figure 1). NOTE Details of preparing the composites, loading the mould and applying the moulding conditions are given in the respec

30、tive standards. They are different for both composites except the mould coverage. 6 Plate dimensions It is recommended to compression mould a plate of about 200 mm 590 mm (see also method II in EN ISO 12115). 7 Procedure 7.1 Follow the recommendations given in EN ISO 2818. 7.2 Cut the test specimens

31、 parallel to the flow direction out of the flow area A of the test plate (see Figure 2). 7.3 Before machining the specimens perpendicular to the flow direction (flow area B) 50 mm of the end of the test plate shall be cut off because of misalignment of fibres at the end of the test plate. NOTE Norma

32、lly 5 tests are carried out to determine the tensile properties. For better statistical safety it is recommended and should agree upon between user and supplier to manufacture 3 test plates of each composites to be tested. 7.4 Check if all test specimens are free of failures which may effect the fur

33、ther test procedure (e.g. surface fissures, high void content, local delaminations etc.) 8 Manufacturing report The report shall include the following information: a) reference to this European Standard, i.e. EN 13421; b) complete identification of the test plate used as given in their respective EN

34、 standard test report; c) date of preparing the specimens; d) dimensions of the specimens; e) number of test specimens for both flow directions; f) statement as to whether any test specimens have been rejected and, if so, the reasons; g) any details not specified in this European Standard which may

35、have an influence on the further test results. 9 Precision The precision of the machining of the test specimens depends on the accuracy of the respective cutting procedure. It has to fulfil the requirements for specimens used to determine the tensile properties according to EN ISO 527-4. Therefore n

36、o special advice is given here. EN 13421:2006 (E) 7 Key 1 mould coverage Figure 1 Mould coverage (25 % to 30 % of the total area) Key 1 cut off 2 flow area B 3 flow area A Figure 2 Flow areas of the test plate EN 13421:2006 (E) 8 Bibliography 1 EN ISO 291, Plastics Standard atmospheres for condition

37、ing and testing (ISO 291:2005) 2 EN ISO 12115, Fibre-reinforced plastics Thermosetting moulding compounds and prepregs Determination of flowability, maturation and shelf life (ISO 12115:1997) 3 ISO 1268-9, Fibre-reinforced plastics Methods of producing test plates Part 9: Moulding of GMT/STC 4 ISO 8

38、605, Textile-glass-reinforced plastics Sheet moulding compound (SMC) Basis for a specification blankBS EN 13421:2006BSI389 Chiswick High RoadLondonW4 4ALBSI British Standards InstitutionBSI is the independent national body responsible for preparing British Standards. It presents the UK view on stand

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