1、AECMA STANDARDNORME AECMAAECMA NORMprEN 2155-6Edition P 1October 2000ICS:Descriptors:PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES (AECMA)Gulledelle 94 - B1200 BRUXELLES - Tel. (+32) 2 ns 6110 - Fax. (+32) 2 ns 8111Supersedes edllion 1March 1980ENGLISH VERSIONAerospace seriesTest met
2、hods for transparent materials for aircraft glazingPart 6 - Determination of optical defectsSerle aerospatlaleMethodes dessals pour materlaux transparentspour vltrages aeronautlquesPartie 6 - Determination des defauts optlquesLuft und RaumfahrtPrufverfahren fUr transparente Werkstoffezur Verglasung
3、von LuftfahrzeugenTell 6 Bestlmmung optischer FehlerThis “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (TheEuropean Association ofAerospace lndustries). It is pUblished on green paper for the needs of AECMA Members. It has been technically approved by the experts
4、 of the concerned Technical Committeefollowing comment by the Member countries.Subsequent to the publication of this Prestandard, the technical content shall not be changed to anextent that interchangeability is affected, physically or functionaffy, without reidentification of thestandard.After exam
5、ination and signature of the AECMA Standard Checking Centre (NPS) and formal agreementof the Official Services of the Member countries it will be submitted as a draft European Standard to CEN(European Committee for Standardization) for formal vota.Nota - Extra copies can be supplied by B.N.A.E. - Te
6、chnopolls 54 199. rue JeanJacques Rousseau - 92138 ISSYLESMOULINEAUX CEOexEdition approved for pUblication200010-31Comments should be sent within six monthsafter the date of publication toAECMAGulledelle 946-1200 BRUXELLESC7 ChairmanMr Wright aecma2000Page 2prEN 21556: 2000Contents123456Scope Defini
7、tion , .Apparatus .Test Specimens Procedure , , , Test Report 333334Page 3prEN 2155-6: 20001 ScopeThis standard specifies the means of examining transparent elements visually and estimating the size andnumber of optical defects.2 DefinitionFor the purpose of this standard the following definition ap
8、plies:Optical defects are bubbles, fibres, hairs, or other foreign matter visible withIn the material, and surfacefaults.3 Apparatus- Amatt white screen large enough to accommodate the largest transparent elements;- a matt black screen of similar dimensions to the white screen;- Brinell inspection m
9、icroscope of approximately 10 times magnification. fitted with a graticule graduatedInO,1 mm;- two fluorescent tubes of not less than 40 W each.4 Test specimensThe specimens are whole transparent elements. The entire surface of each specimen shall be carefullycleaned, taking care not to cause scratc
10、hing or crazing.5 Procedure5.1 InspectIon of defects.The white screen shall be set up at a suitable height and be evenly illuminated. The test specimen shall besupported parallel to the screen and examined for any defects.The test specimen shall then be placed parallel to the black screen situated i
11、n a dark room so that the onlylight on the specimen comes from the two fluorescent tubes placed parallel to the two opposite edges of thespecimen and in the same plane.The illuminated tesl specimen shall be examined for any defects.5.2 Measurement of defectsWith the specimen under strong oblique ill
12、umination the defects shall be identified and measured by usingthe microscope. The area of each defect shall be approximately compared to the nearest geometric shape.Page 4prEN 2155-6: 20006 Test ReportThe test report shall include:- reference to this standard;material type and dimensions;the batch number;the quantity;size, type and number of defects;the layout and the location.
