1、7 AECMA PREN231Li 8Li m LO12311 0002870 8 t - - A.E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM pr EN231 4 Edition -1 August 1984 ENGLISH VERSION Shock resistant acrylic sheets for aircraft glazing Technical specification Aerospace series Feuilles dacrylique rsistant au choc pour vitrages arona
2、utiques Spcification technique Srie arospatiale Luft- und Raumfahrt Schlagzhe Platten aus Acrylglas zur Verglasung von Luftfahrzeugen Technische bieferbedingungen This industrial standard for the aerospace sector has been drawn up under the responsibility o; AECMA (Associa tion Europenne des Constru
3、cteurs de atriel Arospatial). It is published on yellow paper in three equivalent versions (English, French, German). It will be submitted ta CEN (European Committee for Standardization) as a draft European Standard. -y I Approved by The equivalent versions in French and German languages COMITE DE N
4、ORMALISATION can be supplied by B.NA., 8, rue Moreau-Vauthier of A.E.C.M.A. 1983-12-23 92100 BOULOGNE-BILLANCOURT - FRANCE. L ,- - Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted w
5、ithout license from IHS-,-,-AECMA PREN2314 84 W L01231L 0002871 T prEN2314 Page 2 I 4 5 6 7 8 9 10 I1 I2 13 14 15 16 17 18 Contents Scope and field of application References Materials Classif ication Physical properties Optical defects Optical properties Resistance to weathering Thermal properties M
6、echanical properties Susceptibility to crazing Resistance to crack propagation Dimensions Qualification approval Acceptance tests Protection and packaging Storage conditions M a rki n g Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMA
7、Not for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PREN-2314 84 U LOL231L 0002872 L W prEN2314 Page 3 1 Scope and field of application This standard specifies the characteristics of shock resistant transparent acrylic sheets for aircraft glazing. 2 References E
8、W2155, EN2155-1 to EN2155-22, Test methods for transparent niateriais for aircraft glazing, see the table. 3 Materials The sheets shall be made from a copolymer of acrylic, shall contain no plasticiser and shall be controlled under the conditions specified herein. 4 Classification The material shall
9、 be available in four classifications as follows : Class Oa with optical deviation not greater than 130 (0,00043 rad). Optical distortion not greater than that specified in clause 7.5 when the sheet is mounted at an optical incidence of 60“. Class Ob with optical deviation not greater than 3 (0,0008
10、7 rad). Optical distortion not greater than that specified in clause 7.5 when the sheet is mounted at an optical incidence of 60“. Class Oc with optical deviation not greater than 6 (0,00175 rad). Optical distortion not greater than that specified in clause 7.5 when the sheet is mounted at an optica
11、l incidence of 45“. Class Od with optical deviation not greater than 10 (0,00291 rad). Optical distortion not greater than that specified in clause 7.5 when the sheet is mounted at zero optical incidence, .- I Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS
12、under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-. *-. 2 -, AECMA PREN2314 84 LOL23LL 0002873 3 9 the requirements shall be defined -by agreement between the manufacturer and purchaser. If changes are recorded the acceptability shall be discu
13、ssed between manufacturer and purchaser. i) In preparation I r 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-,-,-AECMA PREN2314 Bi.I ipI LO12311 0002875
14、7 kBl : i -.- I. prEN2314 Page 6 9 Thermal propert i es 9.1 Coefficient of linear thermal expansion . The coefficient of linear thermal expansion as determined in EN2155-12 shall not exceed the figure stated in the table. 9.2 Deformation temperature under load The deformation temperature as determin
15、ed in EN2155-13 i) shall not be below that quoted in the table. 9.3 1/10 Vicat softening temperature The softening temperature of the sheet as determined in EN2155-14 ) shall not be below the figure quoted in the table. 9.4 Thermal stability When tested as described in EN2155-15, however at 145 f 5“
16、C, the test sheet shall meet the requirements of clauses 6.3 and 6.4 in this standard. It shall show no significant deterioration in its u1 tra-violet and visible light transmission. A slight degradation of yellow colour is admitted, as long as it conforms to that of the reference plate. 9.5 F1 amma
17、bi 1 i ty ., Flammability will be determined by EN2155-16 I; requirement may be inserted at a 1 ater date. 10 Mechanical properties 10.1 Yield tensile strength and elongation at break When tested as described in EN2155-17 I, the values for these properties shall not be less than those stated in the
18、table. 10.2 Impact strength When tested as described in EF121.55-18 the impact strength shall not be less than the value stated in the table. 11 Susceptibility to crazing 11.1 Craze resistance When tested as described in EN2155-19 at a stress of 21 MPa there shall be no sign of crazing. i) In prepar
19、ation 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-,-,-I prEN2314 Page 7 11.2 When tested as described in EN215540 i) no failure is allowed under a stre
20、ss of 21 MPa. Retention of strength after crazing 12 Resistance to crack propagation When tested as described in EN2155-21 i) the resistance to crack propagation shall not be less than the values stated in the table. Youngs moduly? in tensile has to be normally determined at 10 MPa, as described in
21、EN2155-21 . If this cannot be determined, a value of 4300 MPa at 23C and 5000 MPa at -18C can he used. 13 Dimensions 13.1 The dimensions of the sheets shall be as specified in the contract or order. 13.2 The thickness values at a sheet shall be within the range stated in figure 2 for the particular
22、size range. 14 Qual ificatior: approval 14.1 General provisions Qualification is the recognition OP the capability of the manufacturer to produce in accordance with this technical specification and to guarantee prodl;ction at an acceptable quality level. 14.2 Particular provisions Appl ication for a
23、pproval shall be submitted to the appropriate inspecting authority together with : - evidence that the materials comply with all the requirements specified herein, - sufficient material for which approval is sought to meet the test requirements of this standard, - details of composition, supplied in
24、 confidence, if national practice requires, - recommended forming and fabrication instructions, - details of sheet thicknesses and maximum sizes available. i) in preparation Copyright Association Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for Resa
25、leNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN2314 84 W 1012311 0002877 O = prEN2314 Page 8 If approved the 15 Acceptance 15.1 Sampl For a periodic 14.3 Change Any proposed change by the manufacturer in the formulation and/or the production process shall be notifie
26、d to the approving authority. If significant the material shall be designated a new material requiring specific and separate approval. changed material shall be given a new name or trade symbol. tests ng and inspection test or batch test a single sheet of material shall be taken at random. The sheet
27、 shall be divided into two equal parts, one part shall be tested for compliance with clause 15.2 and the other retained for retest in the case of dispute within three months, The term “batch“ refers to any number of sheets of the same castings mix. lhe term “periodic“ implies that the material shall
28、 be tested every three months or at periods agreed between manufacturer and purchaser. At the discretion of the purchaser any batch of material may be tested to the full requirements of this standard. 15.2 Inspection and tests to be carried out a Any manufacturers material granted qual ification app
29、roval under this standard shall be subject to the following tests : 15.2.1 Each sheet - Optical defects according to clause 6.3 for classes Oa and Ob and according to clause 6.4 for classes Oc and Od - Optical deviation according to clause 7.4 - Dimensions accord ng to clause 13. Copyright Associati
30、on Europeene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,- AECMA PREN2314 84 - 1012311 0002878 2 W - -. prEN2314 Page 9 15.2.2 Lach batch - Deformation temperature under load accor
31、ding to clause 9.2 for material 6 mm and more in thickness - l/O VICAT softening temperature according to clause 9.3 for material less than 6 mm in thickness Impact strength according to clause 10.2. - 15.2.3 Periodic - Ultra-violet light transmission according to clause 7.2 - - Visible light transm
32、ission according to clause 7.3 Haze according to clause 9.6 O - Thermal stability according to clause 9.4 - iensile strength at yield and elongation at break according to clause 18.1 - Craze resistance according to clause 11.1 - Retention of strength after crazing according to clause 11.2. 16 Protec
33、tion and packaging 3.61 IndividuaT sheets shall be protected on both surfaces by a paper or opaque plastic film adhered w-ith a compatible adhesive which can readily be removed without damage to the surfaces. The film shall adequately protect the surfaces from damage during delivery, storage, handli
34、ng and cutting operations. 16.2 Unless otherwise specified by the purchaser all sheets shall be segregated by thickness and size when packed. The container shall be suitable for maintaining the sheets in their original condition and they shall be supported to avoid damage. Copyright Association Euro
35、peene des Constructeurs de Materiel Aerospatial Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-AECMA PREN2314 84 M 1012311 0002877 4 M J prEN2314 Page 10 17 Storage conditions 17.1 Spec i mens The storage conditions of speci
36、men shall be those recommended by the manufacturer. 17.2 Sheet The protected sheets chal 1 be stacked vertically with padded sperators. The storage area shall prevent the influences of temperature and humidity. 18 Marking Each sheet of material shall be legibly marked on the protective film with : -
37、 This standard number , - The name or trade symbol of the manufacturer as designated in the approval , - Batch identification, 1) 1) - Nominal sheet thickness. The marking shall be spaced at approximately 60 cm intervals. Copyright Association Europeene des Constructeurs de Materiel Aerospatial Prov
38、ided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-a prEN2314 Page 11 IABLEAU - Properties of shock resistant acrylic sheets - Units and symbols glcrn“ 21 ,imit values 1.50 1.52 see figure 1 Test method iN2155-1 1) iN2155-2 1) Prope
39、rty Density Water absorption iN2155-3 1) 23 nD Refractive index Ultra-violet transmission EN21554 a c3 rnm 3 mrn .a a4 rnrn il mm s: a - 6 rnrn 6 rnrn i: a 5: 8 rnm lisible light transmission iN2155-5 11 0; e * c1 EN2155-6 Optical defects Optical deviation . See clause 6 iee clause 7. EN2155-7 EN21
40、55-8 Optical distortion iee clause 7. 4 I I See EN2155-9 n Haze lilause i. jee clause 8. N2155-10 1) Resistance to accelerated weathering tN2155-11 11 ;ee clause 8. Resistance to natural weathering Coefficient of thermal expansion EN2155-12 PC - I 7.5.10-5 IN2155-13 1: Deformation temperature under
41、load “C iN2155-14 1 “G 1/10 Vicat softening temperature, Thermal stability iee clause 9. EN2155-I5 iN2155-16 1 F 1 arnmab i 1 i t y see clause 9. Tensile strength at yield M Pa 72 I - iN2155-17 1 Elongation at break Impact strength kJIin iN2155-18 1 EN2155-19 Craze resistance See clause 11.1 See cla
42、use 11.2 iN2155-20 1 Retention of strength after crazing - EN21 55-21 1 .o kJlrn 3t 23C _ MPa.rnml/2 kJirn2 MPa.rnrn112 at -18C 65.6 0.5 Resistance to crack propagation 50.0 1) In preparation 2) Unless otherwise specified Copyright Association Europeene des Constructeurs de Materiel Aerospatial Prov
43、ided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-I AECMA PREN2319 89 W 1012311 0002881 2 W . - . . 1.1 .- - prEN2314 Page 12 P / / I I O !2 m NOISSIWSNVHl I Copyright Association Europeene des Constructeurs de Materiel Aerospatial
44、 Provided by IHS under license with AECMANot for ResaleNo reproduction or networking permitted without license from IHS-,-,-e E EE u d al rl xxxx EEEE EEEE / / i prEN2314 Page 13-7 O P4 a3 * O E E O w 9 c) (u c3 Co Cu * (u O Cu 9 z Co zt 3 v, cr) W Y O I I- H L z W I: cr) -1 H E O 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-,-,-
