ASD-STAN PREN 2155-13-1989 Aerospace Series Test Methods for Transparent Materials for Aircraft Glazing Part 13 - Determination of Temperature at Deflection Under Load (Edition 1)《.pdf
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1、A,E.C.M.A. STANDARD NORME A.E.C.M.A. A.E.C.M.A. NORM prEN 2155 Part 15 Edition 1 December 1989 EDIT PAR LASSOCIATION EUROPEENNE DES CONSTRUCTEURS DE MATRIEL AEROSPATIAL 88, boulevard Malesherbes, 75008 PARIS -TL. 45-63-82-85 UDC : Key words : ENGLISH VERSION Aerospace series Test methods for transpa
2、rent materials for aircraft glazing Part 13 - Determination of temperature at deflection under load Srie arospatiale Mthodes dessais pour matriaux transparents * pour vitrages aronautiques Partie 13 - Dtermination de la temprature de flchissement sous charge Luft- und Raumfahrt Prfverfahren fr trans
3、parente Werkstoffe zur Verlasung von Luftfahrzeugen Teil 13 - Bestimmung der Temperatur bei Durchbiegung unter Belastung 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
4、 in three equivalent versions (English, French, German). It will be submitted as a draft European Standard to CEN (European Committee for Standardization) for final vote. . I I . Approved by The equivalent versions in French and German languages can be supplied by B.N.A.E, 8, rue Moreau-Vauthier COM
5、ITE DE NORMALISATION of A.E.C.M.A. 1989-12-05 92100 BOULOGNE-BILLANCOURT - FRANCE I I prEN 2155-13 Page 2 Contents 1 Scope and field of application 2 Definitions 3 Apparatus 4 Specimens 5 Conditioning 6 Procedure 7 Test report AECMA PRENZL55-13 9 ia 2012312 0002279 prEN 2155-13 Page 3 1 1.1 This sta
6、ndard specifies a procedure for determining the temperature at which an arbitrary deformation occurs when the specimens are subjected to arbitrary bending loads, under conditions of continually rising temperatures. 1.2 The procedure applies to materials in sheet form in thicknesses 3 m. Scope and fi
7、eld of application - It does not apply to stretched/pressed (homogenous) acrylic materials. 2 Definitions For the purpose of this test the temperature of deflection under load is that temperature (attained during conditions of steady increase of temperature) at which a specimen of the material exhib
8、its a specified deflection. 3 Apparatus 3.1 shall conform to the description given below. The apparatus used is constructed essentially as shown in the figure 1 and 3.2 Specimen supports The specimen rests horizontally on metal supports (see figure 1); the load is applied vertdcally on the upper fac
9、e of the specimen at midway between supports by means of a rod. The vertical members, which attach the specimen supports to the upper plate are made of material having the same coefficient of linear expansion as is used for the rod (see note). Note : Unless these parts have the same coefficient of l
10、inear expansion, the differential change in length of these parts introduces an error in the reading of the apparent deformation of the specimen. A blank test is made on each apparatus wng a test bar made of rigid material having a low coefficient of expansion . All temperature ranges to be used sha
11、ll be covered and a correction factor is determined for each temperature. If the correction factor is 0,010 mm or greater, its algebraic sign is noted and the factor is applied to each test by adding it algebraically to the reading of apparent deflection of the tested specimens. 1) Invar or borosili
12、cate glass has been found suitable for this purpose. prEN 255-13 Page 4 3.3 Immersion bath The specimen is immersed in a suitable liquid heat-transfer medium (see note). The bath is well stirred during the test and provided with a means of raising the temperature at an average rate of 2 C/min and th
13、e temperature shall not deviate from the average by more than - + 1 OC at any time measured over periods of 5 min. Note : A liquid heat-transfer medium is chosen which is stable and which does not affect the specimen at the temperatures used. 3.4 Weights A set of weights of suitable sizes is made av
14、ailable so that the specimen can be loaded to a fibre stress of 1,8 ma. The weight of the rod which applies the testing force is determined and included as part of the total load. If a dial gauge is used, the force exerted by its spring is determined and included as part of the total load (see notes
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