1、 DEUTSCHE NORMMay 2006DIN EN 13421 ICS 83.120 Plastics Thermoset moulding compounds Composites and reinforcement fibres Preparation of specimens for determining the anisotropy of the properties of compression moulding composites English version of DIN EN 13421:2006-05 Kunststoffe Duroplast-Formmasse
2、n Verbundwerkstoffe und Verstrkungsfasern Herstellung von Probekrpern zur Bestimmung der Anisotropie der Eigenschaften von verpressten Formmassen Englische Fassung DIN EN 13421:2006-05 Document comprises 10 pages No part of this standard may be reproduced without prior permission of DIN Deutsches In
3、stitut fr Normung e. V., Berlin. Beuth Verlag GmbH, 10772 Berlin, Germany, has the exclusive right of sale for German Standards (DIN-Normen). English price group 7 www.din.de www.beuth.de !,nlr“10.06 9757379DIN EN 13421:2006-05 2 National foreword This standard has been prepared by CEN/TC 249 Plasti
4、cs (Secretariat: Belgium). The responsible German body involved in its preparation was the Normenausschuss Kunststoffe (Plastics Standards Committee), Technical Committee FNK-AA 203.1 Rieselfhige Duroplaste und langfaserverstrkte Kunststoffe. The European Standards referred to in clause 2 of the EN
5、have been published as the corresponding DIN EN ISO with the same number. EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13421February 2006ICS 83.120English VersionPlastics - Thermoset moulding compounds - Composites andreinforcement fibres - Preparation of specimens for determiningthe anisotropy
6、 of the properties 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 V
7、erstrkungsfasern - 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 t
8、his EuropeanStandard 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 (En
9、glish, French, 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, Cze
10、ch Republic, 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
11、 DE NORMALISATIONEUROPISCHES 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 Sc
12、ope 5 2 Normative 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
13、CEN/TC 249 “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
14、 by August 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,
15、Italy, Latvia, 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 carr
16、y even longer 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 anisotrop
17、y received 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 s
18、upposition 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 plate
19、s has to be 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, whic
20、h are being 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,
21、the latest 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
22、) EN ISO 2818, 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 re
23、sins and chopped 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
24、 of glass 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 prepar
25、ation of compression 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
26、 comparable 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
27、the respective 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
28、 specimens 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.
29、NOTE Normally 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 effe
30、ct the further 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 res
31、pective EN 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
32、which may 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. T
33、herefore no 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
34、 conditioning 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 8605, Textile-glass-reinforced plastics Sheet moulding compound (SMC) Basis for a specification
