1、BSI Standards PublicationBS EN 6038:2015Aerospace series Fibre r e i n f o r c e d p l a s t i c s T e s t method Determination of the compression strength after impactBS EN 6038:2015 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN 6038:2015.The UK participation
2、 in its preparation was entrusted to Technical Committee ACE/65, Non-metallic materials for aerospace purposes.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Us
3、ers are responsible for its correct application. The British Standards Institution 2015. Published by BSI Standards Limited 2015ISBN 978 0 580 86121 5 ICS 49.025.40 Compliance with a British Standard cannot confer immunity from legal obligations.This British Standard was published under the authorit
4、y of the Standards Policy and Strategy Committee on 30 November 2015.Amendments/corrigenda issued since publicationDate T e x t a f f e c t e dBS EN 6038:2015EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 6038 November 2015 ICS 49.025.40 English Version Aerospace series - Fibre reinforced plas
5、tics - Test method -Determination of the compression strength after impact Srie arospatiale - Matires plastiques renforces de fibres - Mthode dessai - Dtermination de la rsistance en compression aprs impact Luft- und Raumfahrt - Faserverstrkte Kunststoffe - Prfverfahren - Bestimmung der Restdruckfes
6、tigkeit nach Schlagbeanspruchung This European Standard was approved by CEN on 21 June 2014. 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
7、 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 language made by translation u
8、nder 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, Denmark, Estonia, Finland, Forme
9、r 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 COMMITTEE FOR STANDARDIZATION COMIT E
10、UROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels 2015 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 6038:2015 EBS EN 6038:2015EN 6038:2015 (E) 2 Contents Page
11、 European foreword . 3 1 Scope 4 2 Normative references 4 3 Terms and definitions . 4 4 Principle of the method 4 5 Designation of the method . 5 6 Apparatus . 5 7 Test specimen . 5 8 Procedure. 6 9 Presentation of the results 7 10 Test report . 8 BS EN 6038:2015EN 6038:2015 (E) 3 European foreword
12、This document (EN 6038:2015) 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 Association, this Standard has received the approval of the National Associations and
13、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 endorsement, at the latest by May 2016, and conflicting national standards shall be withdr
14、awn at the latest by May 2016. 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 identifying any or all such patent rights. According to the CEN-CENELEC Internal Regulations, the
15、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 Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
16、 Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. BS EN 6038:2015EN 6038:2015 (E) 4 1 Scope This European Standard defines a method to be used to measure the low speed impact resistance charac
17、teristics of fibre reinforced plastics. It is applicable to composite laminates with unidirectional plies or woven fabric reinforcement. This standard does not give any direction necessary to meet health and safety requirements. It is the responsibility of the user of this standard to consult and es
18、tablish appropriate health and safety precautions. 2 Normative references The following documents, in whole or in part, 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 edit
19、ion of the referenced document (including any amendments) applies. EN 2374, Aerospace series Glass fibre reinforced mouldings and sandwich composites Production of test panels EN 2565, Aerospace series Preparation of carbon fibre reinforced resin panels for test purposes 1)EN 2743, Aerospace series
20、Fibre reinforced plastics Standard procedures for conditioning prior to testing unaged materials EN 2760, Aerospace series Steel FE-PL78 1 760 Rm 2 000 MPa Bar De 75 mm 1)3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 compression strength af
21、ter impact maximum compression load experienced by the impacted specimen divided by the initial gross cross sectional area 4 Principle of the method Subject the laminate specimen to impacts of varying energy, then measure the indentation depth and the compression strength after impact. 1) Published
22、as ASD-STAN Prestandard at the date of publication of this standard. http:/www.asd-stan.org/ BS EN 6038:2015EN 6038:2015 (E) 5 5 Designation of the method The designation of the method used shall be drawn up according to the following example: Description block Fibre reinforced plastics Determinatio
23、n of compression strength after impact Identity block EN6038 Number of this standard 6 Apparatus 6.1 Impact machine: drop weight impact tester, capable of capturing the drop weight after the first impact so that a restrike shall not occur (see Figure 3). 6.2 Impactor with the following characteristi
24、cs (see Figure 1). 6.3 Flat-faced micrometer with 6 mm diameter anvils, calibrated to within 0,01 mm. 6.4 Depth gauge with hemispheric adapter, diameter 3 mm and calibrated to within 0,01 mm accuracy. 6.5 Test machine accurate to within 1 % in the relevant load range. 6.6 Compression tools (drawings
25、 in Figure 4 for information). 6.7 Vernier slide callipers calibrated to within 0,1 mm. 7 Test specimen 7.1 Specimen description For the description, dimensions, tolerances see Figure 5. 7.2 Specimen preparation The specimens are cut out from laminates. The coefficient of variation in the thickness
26、measurements shall be smaller than 2 % per laminate. The laminates shall be produced according to EN 2565 for carbon, or according to EN 2374 for glass. The laminate should be inspected for example by C-Scan to establish that the laminate is worth testing. If the NDT reveals unacceptable defects, li
27、mits defined by the specification invoking the test, the laminate should not be tested. The process parameters shall be in line with the specification invoking the test. BS EN 6038:2015EN 6038:2015 (E) 6 7.3 Number of specimens Eight specimens shall be tested, one for each energy specified as define
28、d in 8.3. Three specimens shall be tested at the BVID as defined in 8.5. 8 Procedure 8.1 Conditioning The storage and testing of the dry specimens shall be carried out at (23 2) C, (50 5) % relative humidity in accordance with EN 2743. 8.2 Determination of dimensions Measure and record the thickness
29、 and width at three points of the specimen. Use the micrometer for the thickness and the vernier slide callipers for the width. 8.3 Impact tests As shown in Figure 3, secure the specimen to a flat mounting plate using four snap fasteners. This leaves a clear window of 75 ( 0,1) 125 ( 0,2) mm. Set th
30、e drop height according to the selected impact energy (see formula in 9.1). Subject the specimens to impact with energy: 9, 12, 16, 20 and 25 joules (impactor 1 kg to 3 kg), 30 and 40 joules (impactor 4 kg to 6 kg). The specimens must only receive one impact. Therefore bouncing must be prevented usi
31、ng a suitable device. 8.4 Indentation inspection Inspect each specimen and assess, on the impact face and the opposite face: the visibility of the indentation, any breaks in the fibres. Just prior to perform the compression test, set the specimen between two appropriate tabs. Using a depth gauge, me
32、asure the indentation depth on the impacted face to within 0,05 mm with the following procedure: measure the depth gauge value in the deapest part of the indented area, then measure the depth gauge value on 4 points as shown in Figure 2 and substract from the value in the indented area, the indented
33、 depth is the average of these 4 values. BS EN 6038:2015EN 6038:2015 (E) 7 8.5 Study of the barely visible impact damage (BVID) Draw up the curve of the evolution of the indentation depth as a function of the impact energy. By linear interpolation, determine the energy EBVID(energy for the barely vi
34、sible impact damage) corresponding to an indentation of 0,3 mm. Subject three specimens to impact with energy EBVID. After having been impacted inspect on those three specimens the depth of the indentation (same as defined 8.4) and perform the compression test (same as defined in 8.6). 8.6 Compressi
35、on tests on impacted specimens Compression strength after impact has to be determined for all the specimens subjected to impact testing. If required in the relevant specification, two strain gauges should be on the front face of the lowest impact energy specimen. Carefully align the impacted specime
36、n in the test rig (if any, the strain gauges should be at the top of the specimen during testing). Select the range of loads so that break failure occurs between 20 % and 80 % of the scale. Select a cross head speed of 0,5 mm/min. Note the load Pr of the break failure. Record the curve load versus t
37、ime. 9 Presentation of the results 9.1 Impact energy Energy E is expressed (depending on the test machine used) in joules using the formula: E = m g h or E = 1/2 m v2where E impact energy, in J; m is the impactor mass, in kg; g = 9,81 in m/s2;h is the drop height,in m; v is the speed at which the im
38、pactor impacts the specimen, in m/s. BS EN 6038:2015EN 6038:2015 (E) 8 9.2 Compression strength after impact at a specific impact energy level E wt =r(E)Prwhere r(E) is the compression strength after impact, in MPa; Pr is the break failure load, in N; w is the specimen width, in mm; t is the thickne
39、ss of the specimen, in mm. 9.3 Nominal compression strength after impact wt =rn(E)nPrwhere r n(E) is the nominal compression strength after impact, in MPa; Pr is the break failure load, in N; w is the specimen width, in mm; tnis the nominal thickness of the specimen, in mm. 10 Test report The test r
40、eport shall refer to this standard and shall include the following: 10.1 Complete identification of the material tested, including at least type, source, manufacturers code number, fibre areal weight, filament count, processing details. 10.2 All details regarding specimen preparation. 10.3 The measu
41、red test specimen. 10.4 Date of test, facility and identification of individuals performing the test. 10.5 Equipment, method and test parameters used. 10.6 For each impacted specimen record of: impact energy, visibility and depth of indentation, any breaks in the fibres (on both faces of the specime
42、n), compression strength after impact. 10.7 Curve of compression strength after impact versus energy. 10.8 Curve of indentation depth versus energy. BS EN 6038:2015EN 6038:2015 (E) 9 10.9 The Barely Visible Impact Damage and corresponding value of strength. 10.10 Any incident which may have affected
43、 the results and any deviation from this standard. Mass : in the ranges 1 kg to 3 kg or 4 kg to 6 kg to within 10 g Diameter : D = (16 0,5) mm Sphere radius : r = (8 0,25) mm Material : steel Rm= 2 000 MPa according to EN 2760 or equivalent Roughness : Ra 0,8 mm Figure 1 Impactor Key Indentation. +
44、Points to measure the indentation depth (at 20 mm from the indentation). Figure 2 Measurement of indentation depth BS EN 6038:2015EN 6038:2015 (E) 10 Key 1 Release system 7 Anti-bounce device 2 Guide tube 8 Rubbers 3 Impactor (see Figure 1) 9 Guide pins 4 Support beam 10 Window: (75 125) mm 5 Specim
45、en (see Figure 5) 11 Clamping system 6 Steel base, thickness: 20 mm Figure 3 Impact test equipment (principle) BS EN 6038:2015EN 6038:2015 (E) 11 Figure 4 Compression test equipment (principle) BS EN 6038:2015EN 6038:2015 (E) 12 Key 1 Strain gauge 2 impact location Lay-up: Tape lay-up : (45 / 0 / 45
46、 / 90) n sym Fabric lay-up : ( 45), (0,90) m sym NOTE n and m are to be determined to obtain a thickness of the laminate as close as possible to 4 mm. 0 is equivalent to “warp“ direction and 90 is equivalent to welt direction. Figure 5 Impact specimen This page deliberately left blankBSI is the nati
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