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 ,- - 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 icati
5、on Physical properties Optical defects Optical properties Resistance to weathering Thermal properties Mechanical properties Susceptibility to crazing Resistance to crack propagation Dimensions Qualification approval Acceptance tests Protection and packaging Storage conditions M a rki n g AECMA PREN-
6、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 EW2155, EN2155-1 to EN2155-22, Test methods for transparent niateriais for aircraft glazing, see
7、 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 be available in four classifications as follows : Class Oa with optical deviation not greater
8、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 (0,00087 rad). Optical distortion not greater than that specified in clause 7.5 when the sheet is moun
9、ted 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 optical incidence of 45“. Class Od with optical deviation not greater than 10 (0,00291 rad). Optical
10、distortion not greater than that specified in clause 7.5 when the sheet is mounted at zero optical incidence, .- I . *-. 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
11、be discussed between manufacturer and purchaser. i) In preparation I r AECMA PREN2314 Bi.I ipI LO12311 0002875 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
12、 the figure stated in the table. 9.2 Deformation temperature under load The deformation temperature as determined 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 t
13、he figure quoted in the table. 9.4 Thermal stability When tested as described in EN2155-15, however at 145 f 5“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 slig
14、ht degradation of yellow colour is admitted, as long as it conforms to that of the reference plate. 9.5 F1 ammabi 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
15、tested as described in EN2155-17 I, the values for these properties shall not be less than those stated in the 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 resista
16、nce When tested as described in EN2155-19 at a stress of 21 MPa there shall be no sign of crazing. i) In preparation I prEN2314 Page 7 11.2 When tested as described in EN215540 i) no failure is allowed under a stress of 21 MPa. Retention of strength after crazing 12 Resistance to crack propagation W
17、hen 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 EN2155-21 . If this cannot be determined, a value of 4300 MPa at 23C and 5000 MPa at -
18、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 size range. 14 Qual ificatior: approval 14.1 General provisions Qualification is the r
19、ecognition 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 approval shall be submitted to the appropriate inspecting authority together with : - e
20、vidence 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 confidence, if national practice requires, - recommended forming and fabrication inst
21、ructions, - details of sheet thicknesses and maximum sizes available. i) in preparation 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
22、 shall be notified 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
23、random. The sheet 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 t
24、he material shall 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 q
25、ual ification approval 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. -
26、AECMA PREN2314 84 - 1012311 0002878 2 W - -. prEN2314 Page 9 15.2.2 Lach batch - Deformation temperature under load according 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 accor
27、ding to clause 10.2. - 15.2.3 Periodic - Ultra-violet light transmission according to clause 7.2 - - Visible light transmission 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 1
28、8.1 - Craze resistance according to clause 11.1 - Retention of strength after crazing according to clause 11.2. 16 Protection 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 wi
29、thout damage to the surfaces. The film shall adequately protect the surfaces from damage during delivery, storage, handling 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 m
30、aintaining the sheets in their original condition and they shall be supported to avoid damage. AECMA PREN2314 84 M 1012311 0002877 4 M J prEN2314 Page 10 17 Storage conditions 17.1 Spec i mens The storage conditions of specimen shall be those recommended by the manufacturer. 17.2 Sheet The protected
31、 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 : - This standard number , - The name or trade symbol of the manufacturer as de
32、signated in the approval , - Batch identification, 1) 1) - Nominal sheet thickness. The marking shall be spaced at approximately 60 cm intervals. 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 iN
33、2155-1 1) iN2155-2 1) Property 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 i
34、ee clause 7. EN2155-7 EN21 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: Def
35、ormation temperature under 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 resista
36、nce See clause 11.1 See clause 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 I AECMA PREN2319 89 W 1012311 0002881 2 W . - . . 1.1 .- - prEN2314 Page 12 P / / I I O !2 m NOISSIWSNVHl I 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
