1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS EN 3864:2013Aerospace series Non-metallic materials Glasstransparencies Test methods Determination of modulusof ruptureBS EN 3864:2013 BRITISH STANDARDNational forewordThis Br
2、itish Standard is the UK implementation of EN 3864:2013.The UK participation in its preparation was entrusted to TechnicalCommittee ACE/65, Non-metallic materials for aerospace purposes.A list of organizations represented on this committee can beobtained on request to its secretary.This publication
3、does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 80965 1ICS 49.025.99Compliance with a British Standard cannot confer immunity fromlega
4、l obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 June 2013.Amendments issued since publicationDate Text affectedBS EN 3864:2013EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 3864 May 2013 ICS 49.025.99 English Version Aer
5、ospace series - Non-metallic materials - Glass transparencies - Test methods - Determination of modulus of rupture Srie arospatiale - Matriaux non-mtalliques - Transparents en verre - Mthodes dessais - Dtermination du module de rupture Luft- und Raumfahrt - Nichtmetallische Werkstoffe - Transparente
6、 Glaswerkstoffe - Prfverfahren - Bestimmung des Bruchmoduls This European Standard was approved by CEN on 19 January 2013. 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 with
7、out any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member. This European Standard exists in three official versions (English, French, German). A version in any other
8、language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, De
9、nmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITT
10、EE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3864:2013: EBS EN 3864:2013EN 3864:2013
11、(E) 2 Contents Page Foreword 3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms, definitions and abbreviations 5 4 Health, safety and environment .5 5 Principle/technique 5 6 Resources .6 7 Test samples/test pieces 6 8 Test procedure .7 9 Expression of results 7 10 Measurement uncertaintie
12、s 8 11 Designation 8 12 Test report 8 BS EN 3864:2013EN 3864:2013 (E) 3 Foreword This document (EN 3864:2013) has been prepared by the Aerospace and Defence Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Assoc
13、iation, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its presentation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorseme
14、nt, at the latest by November 2013, and conflicting national standards shall be withdrawn at the latest by November 2013. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identif
15、ying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugosla
16、v Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 3864:2013EN 3864:2013 (E) 4 Introduction This
17、 standard is part of the series of EN non-metallic material standards for aerospace applications. The general organisation of this series is described in EN 4385. This standard is a level 3 document as defined in EN 4385. It has been prepared in accordance with TR 4386. BS EN 3864:2013EN 3864:2013 (
18、E) 5 1 Scope This European Standard defines the requirements for the determination of the modulus of rupture of glass transparencies for aircraft applications, whether in the annealed or chemically or thermally tempered condition. 2 Normative references The following documents, in whole or in part,
19、are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 3001, Aerospace series Tempered float glass plies
20、for aircraft applications Technical specification 1)EN 4385, Aerospace series Non-metallic materials General organisation of standardisation Links between types of standards 1)TR 4386, Aerospace series Non-metallic materials Rules for the drafting and presentation of test method standards 2)3 Terms,
21、 definitions and abbreviations For the purposes of this document, the following terms, definitions and abbreviations apply. 3.1 modulus of rupture MOR the surface fibre stress applied to a glass in bending, at the point at which rupture takes place 4 Health, safety and environment This standard does
22、 not necessarily include all health, safety and environment requirements, associated with its use. Persons using this standard shall be familiar with normal laboratory / test house practices. It is the responsibility of the user to establish satisfactory health, safety and environment practices and
23、to ensure conformity with any European, National or local laws / regulations. 5 Principle/technique A specimen of glass representing the transparency is subjected to four points bending to failure, and the MOR is then calculated from the breaking load and specimen dimensions. 1) Published as ASD-STA
24、N Prestandard at the date of publication of this standard (www.asd-stan.org). 2) Published as ASD-STAN Technical Report at the date of publication of this standard (www.asd-stan.org). BS EN 3864:2013EN 3864:2013 (E) 6 6 Resources 6.1 Apparatus/facilities Four point bending jig (see Figure 1). Harden
25、ed steel cylindrical loading rollers. The centre pair of rollers shall be joined by a frame able to pivot at its centre, to ensure equal application of the load by the loading members. Roller radius and roller spacing shall be as specified in Table 1. Loading machine capable of the required rate of
26、loading. The machine shall be equipped with a method of recording the maximum load applied during the test, and shall have a valid certificate of calibration. Micrometer to measure thickness of test beams. Calliper to measure width of test beams. 6.2 Materials/reagents Not applicable 6.3 Qualificati
27、on of personnel Not applicable 7 Test samples/test pieces Beams of rectangular cross section shall be cut to size using diamond or wheel cutting. The beams shall be edge finished by the same process as the full scale glass that they represent. The width to thickness ratio of the beams shall be betwe
28、en 2:1 and 10:1 with a minimum beam width of 10 mm. Recommended beam sizes are specified in Table 1. Table 1 Recommended test beam dimensions and loading roller dimensions Dimensions in millimetres Beam dimensions Distance between rollers Roller radius Thickness Length width (see Figure 1) d L w a b
29、 c % 6 120 40 15 70 40 3 25 152,4 25,4 44,5 127 38 6 250 40 50 200 100 6 25 254 38,1 62,5 200 75 BS EN 3864:2013EN 3864:2013 (E) 7 8 Test procedure See Figure 1. The thickness of each beam shall be measured to the nearest 0,1 mm. The width of the beam shall be measured at a minimum of three equally
30、spaced positions, and the mean width calculated. The test beam shall be inserted into the test machine, and the loading rollers set to the values stated in Table 1. The load shall be uniformly applied until failure occurs. A small load may be applied prior to loading to failure, in order to locate a
31、nd hold the beam in position. If this option is taken, the preload shall not exceed 10 % of the estimated load required to produce failure. The loading rate shall be as given in Table 2. Table 2 Loading rates Glass type Loading rate Annealed (1,1 0,2) MPa/s Tempered That required to give a mean fail
32、ure time of 1 min, irrespective of glass strength. The origin of failure shall be noted. To make this possible, a soft, transparent plastic tape is permitted on the compression side of the test beam during loading. 9 Expression of results 9.1 The Modulus of Rupture (MOR) shall be calculated as follo
33、ws: MOR = 3 a (L / wd2) MPa where L is the breaking load (N); a is the distance between inner and outer loading rollers (mm); w is the mean width of beam (mm); d is the thickness of beam (mm). 9.2 The standard deviation () shall be calculated as follows: 22)(11xxnini= where n is the number of beams
34、tested; x is the arithmetic mean MOR; xi is the individual beam MOR. BS EN 3864:2013EN 3864:2013 (E) 8 10 Measurement uncertainties The precision of this test method is not known because inter-laboratory data are not available. 11 Designation Not applicable 12 Test report The test report shall inclu
35、de: reference to the test method designation; designation of the apparatus; any other information relevant to the test method; identification and traceability of the semi-finished product to be tested, in accordance with the technical specification; test beam dimensions; expression of results; trace
36、ability to test apparatus used; traceability to individual performing the test work; any incident which may have affected the results; any deviation from the test method standard; date of test; location of fracture origin. BS EN 3864:2013EN 3864:2013 (E) 9 Key 1 Load application 2 Test specimen Figu
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