AECMA PREN 2343-1994 Aerospace Series Heat and Crazing Resistant Cast and Multi-Axially Orientated Acrylic Sheets for Aircraft Glazing Technical Specification Edition 1《航空航天系列.抗热和裂.pdf

1、CEN PRENx2343 94 = 3404587 0073123 626 E AECMA STANDARD NORME AECMA AECMA NORM prEN 2343 Edition 1 September 1994 EDITE PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATERIEL AEROSPATIAL Technopolis - 175, rue Jean-Jacques Rousseau - F-92138 Issy-les-Moulineaux Cedex - Tl. (1) 47.36.98.76 UDC : 6

2、78.744.32 - 419 : 629.73.023.26 Descriptors : Aircraft industry, glazing, sheets, plastic sheets, acrylic resins, heat resistance, mechanical strength, specifications ENGLISH VERSION Aerospace series Heat and crazing resistant cast and multi-axially orientated acrylic sheets for aircraft glazing Tec

3、hnical specification Srie arospatiale Feuilles dacrylique coules et orientes multi-axialement, rsistant la chaleur et au fendillement pour vitrages aronautiques Spcification technique Luft- und Raumfahrt Wrmeform- und spannungsribestndige, gegossene und multiaxial orientierte Acrylglaspiatten fr Luf

4、tfahrzeugverglasungen Technische Lieferbedingungen This “Aerospace series“ Standard has been drawn up under the responsibility of AECMA (Association Europenne des Constructeurs de Matriel Arospatial). . It is published on yellow paper in three equivalent versions (English, French, German). It will b

5、e submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. Edition approved for publication 1994-09-30 I The equivalent versions in French and German languages can be supplied by B.N.A.E. - Technopolis 54 - 199, rue Jean-Jacques Rousseau 921 38 ISSY - L

6、ES - MOULINEAUX CEDEX - FRANCE Q aecrna i394 Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- - CEN PRENx2343 74 m 3404589 0073324 562 Page 3 prEN 2343

7、 : 1994 1 Scope This standard specifies the characteristics of heat and crazing resistant cast and multi-axially orientated transparent acrylic sheets for aircraft glazing. The multi-axial orientation may be realized by pressing or st retch i ng . 2 Normative references This European Standard incorp

8、orates by dated or undated reference provisions from other publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this Europe

9、an Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. IS0 179 IS0 527 IS0 11 83 IS0 4607 IS0 4892 EN 2000 EN 21 55-2 EN 2155-3 EN 2155-4 EN 2155-5 EN 21 55-6 EN 21 55-7 Plastics - Determination of Charpy i

10、mpact strength of rigid materials Plastics - Determination of tensile properties Plastics - Methods for determining the density and relative density of non-cellular plastics Plastics - Methods of exposure to natural weathering Plastics - Methods of exposure to laboratory light sources Aerospace seri

11、es - Quality assurance - EN aerospace products - Approval of the quality system of manufacturers Aerospace series - Test methods for transparent materials for aircraft glazing - Part 2 - Determination of water absorption Aerospace series - Test methods for transparent materials for aircraft glazing

12、- Part 3 - Determination of refractive index Aerospace series - Test methods for transparent materials for aircrafl glazing - Part 4 - Determination of ultra-violet radiation transmission at 290 to 330 nm Aerospace series - Test methods for transparent materials for aircraft glazing - Part 5 - Deter

13、mination of visible light transmission Aerospace series - Test methods for transparent materials for aircraft glazing - Part 6 - Determination of optical defects Aerospace series - Test methods for transparent materials for aircraft glazing - Part 7 - Determination of optical deviation l) Published

14、as AECMA Standard at the date of publication of this standard Previous page is blank Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEN PREN*k2343 94

15、3404589 0073325 4T9 D Page 4 prEN 2343 : 1994 EN 2 EN 2 EN 2155-8 EN 21 55-9 EN 21 55-1 2 EN 21 55-1 9 EN 2155-20 55-2 1 55-22 EN 2310 EN 3042 Aerospace series - Test methods for transparent materials for aircraft glazing - Part 8 - Determination of optical distortion Aerospace series - Test methods

16、 for transparent materials for aircraft glazing - Part 9 - Determination of haze Aerospace series - Test methods for transparent materials for aircraft glazing - Part 12 - Determination of linear thermal expansion Aerospace series - Test methods for transparent materials for aircraft glazing - Part

17、19 - Determination of craze resistance Aerospace series - Test methods for transparent materials for aircraft glazing - Part 20 - Determination of retention of strength after crazing 2, Aerospace series - Test methods for transparent materials for aircraft glazing - Pari 21 - Determination of resist

18、ance to crack propagation (K factor) Aerospace series - Test methods for transparent materials for aircraft glazing - Part 22 - Determination of thermal relaxation of stretched acrylic materials 2, Aerospace senes - Test methods for the flame resistance rating of non-metallic materials Aerospace ser

19、ies - Quality assurance - EN aerospace products - Qualification procedure 3 Definitions For the purposes of this standard, the following definitions apply. 3.1 Production batch : Multi-axially orientated materials produced under the same conditions of manufacture from the same batch of as-cast mater

20、ial supplied by a particular manufacturer and stored under identical conditions. NOTE : Equipment failure would require recalibration of some parts of the installation and would therefore terminate the manufacture of the production batch. 3.2 Manufacturer See EN 2000. 3.3 Purchaser Body which purcha

21、ses the products from a manufacturer or a stockist in accordance with the requirements of the user. NOTE : The purchaser may also be the user. 3.4 User See EN 2000. Published as AECMA Standard at the date of publication of this staiidard 2) In preparation at the date of publication of this standard

22、Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-CEN PREN*2343 94 3404589 0073326 335 Page 5 prEN 2343 : 1994 4 Material The sheets shall be made from a

23、 modified acrylic polymer or co-polymer mainly consisting of methyl methacrylate. The characteristics are specified in table 1. 5 Class A : Class B : Class C : Class D : 6 6.1 Classes of optical quality optical deviation less than or equal to 130“ (0,00043 rad). Optical distortion less than or equal

24、 to gradient of 1/17 at an optical incidence of 60“. optical deviation less than or equal to 3 (0,00087 rad). Optical distortion less than or equal to gradient of 1/17 at an optical incidence of 60“. optical deviation less than or equal to 6 (0,00175 rad). Optical distortion less than or equal to gr

25、adient of 1/12 at an optical incidence of 45. optical deviation less than or equal to 10 (0,00291 rad). Optical distortion less than or equal to gradient of 1/12 at zero optical incidence. Physical characteristics Density See table 1 6.2 Water absorption See table 1. The water absorption shall be de

26、termined after conditioning for 96 h at 70C. 7 Appearance 7.1 have a high quality finish. The sheets shall be colouriess, free from scratches, crazing, voids or inhomogeneities and 7.2 The sheets in classes A and B shall satisfy the following requirements : - No defect larger than those defined in E

27、N 21 55-6. - Sheets containing major or minor defects defined in EN 2155-6 shall be acceptable if : . an area enclosed by a circle of 150 mm radius around each major defect shall contain no other major defect and not more than three minor defects, . other major defect and not more than five minor de

28、fects. an area enclosed by a circle of 150 mm radius around any point on the sheet shall contain no The accumulation of defects smaller than the minor defects shall be the subject of agreement between the manufacturer and purchaser. 7.3 shall be agreed between the manufacturer and purchaser. Sheets

29、in classes C arid D shall be examined to EN 2155-6, the acceptance criteria for defects Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- CEN PRENJ2343

30、94 3404589 0073327 271 Page 6 prEN 2343 : 1994 8 Optical characteristics 8.1 Refractive index See table 1. 8.2 Ultra-violet radiation transmission See table 1. 8.3 Visible light transmission See table 1. 8.4 Optical deviation See table 1. 8.5 Optical distoriion See table 1. 8.6 Haze See table 1. 9 R

31、esistance to weathering 9.1 Resistance to accelerated weathering See table 1. 9.2 Resistance to natural weathering See table 1. 10 Thermal characteristics 10.1 See table 1. 10.2 Flame resistance rating See table 1. Coefficient of linear thermal expansion 11 11.1 See table 1. Mec han cal c haracteric

32、 t icc Tensile strength, elongation at break and elongation at yield Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- CEN PREN*2343 94 E 3404589 007332

33、8 LO8 = Page 7 prEN 2343 : 1994 Impact resistance 11.2 See table 1. The type of specimen shall be defined by agreement between the manufacturer and the purchaser. 12 Susceptibility to solvent crazing 12.1 Craze resistance See table 1. 12.2 Strength after crazing See table 1. Failure of more than one

34、 specimen shall entail rejection of the batch. If one specimen fails, a further sample of 10 specimens from another sheet of the same batch shall be tested under the same condition. No specimen shall fail on re-test. 13 Resistance to crack propagation See table 1. 14 See table 1. In case of dispute,

35、 the reference method is method A. Thermal relaxation - degree of stretch 15 Dimensions and tolerances 15.1 Dimensions They shall conform to the purchasers requirements. 15.2 Tolerances 15.2.1 Length and width They shall conform to the purchasers requirements. 15.2.2 Thickness - f 0,5 mm for thickne

36、sses 2.5 mm up to 8 mm 8 mm up to 12 mm 12 mm up to 20 mm Optical defects Optical deviation Optical gradient Haze Resistance to accelerated weathering Resistance to natural weathering Coefficient of linear thermal expansion Flame resistance rating Tensile strength Elongation at break Elongation at y

37、ield Impact resistance Craze resistance under 20,7 MPa Strength after crazing under 20,7 MPa Resistance to crack propagation at (23 2 2)“C at (-1 8 2 2)“C Thermal relaxation : - according to method A or - according to method B Degree of stretch 1)n value of five measurements. dist oriion discontinui

38、ties min. max. 1,18 1,19 30 IS0 1183-A EN 21 55-2 EN 2155-3 glcm3 mg nn2 1,48 I 1,50 See figure 1 EN 21 55-4 % 91 90 89 % EN 2155-5 88 - See 7 EN 2155-6 EN 21 55-7 EN 2155-8 EN 2155-9 See 5 See 5 mm I 0,s 6 1) % By agreement between manufacturer and purchaser By agreement between manufacturer and pu

39、rchaser (average value) By agreement between manufacturer and purchaser 62 1 - 7.1 IS0 4892 IS0 4607 EN 21 55-1 2 11C EN 2310 IS0 527 MPa % YO kJ/mz 15 50 2 I 10 30 I IS0 179 No signs of crazing See 12.2 EN 21 55-1 9 EN 21 55-20 EN 2155-21 3 _- 2 N.mm - I lo % EN 21 55-22 118 I - “C % I 60 I - JO in

40、dividual measurement $ _- 2 3 2 2, Minimum mean value of five determinations. No individual determination 80 N.mm 3, Minimum mean value of five determinations. No individual determination 40 N.mm _- Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under licen

41、se with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Page 11 prEN 2343 : 1994 % 60 50 C O .I a 40 E .I 20 10 1 2 3 4 5 Thickness 6 d mm Figure 1 : Maximum admissible ultra-violet radiation transmission between 290 nm and 330 nm Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-