1、AECMA STANDARD NORME AECMA AECMA NORM Edition approved for publication 28 February 2005 prEN 4429 Edition P 1 February 2005 Comments should be sent within six months after the date of publication to Non-metallic Material Domain AECMA-STAN ICs: Descriptors: ENGLISH VERSION Aerospace series Non-metall
2、ic materials Text i les Testing of narrow woven fabrics Determination of warp bow Srie arospatiale Matriaux non-mtalliques Textiles Essais des tissus troits Dtermination du cintrage sens chane Luft- und Raumfahrt Nichtmetallische Werkstoffe Textilien Prfung von Schmal Geweben Bestimmung der Konizite
3、t This “Aerospace Series“ frestandard has been drawn up under the responsibility of AECMA-STAN (The European Association of Aerospace Industries - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Doma
4、in following member comments. Subsequent to the publication of this pre-standard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and review by users and formal agree
5、ment of AECMA-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to implement the EN at national level by giving the EN the status of a na
6、tional standard and by withdrawing any national standards conflicting with the EN. I I Copyright 2005 O by AECMA-STA1 Page 2 prEN 4429:2005 Foreword This standard was reviewed by the Domain Technical Coordinator of AECMA-STANS Non-metallic Material Domain. After inquiries and votes carried out in ac
7、cordance with the rules of AECMA-STAN defined in AECMA-STANS General Process Manual, this standard has received approval for Publication. Page 3 prEN 4429:2005 O Introduction This standard is part of the series of EN non-metallic materials for aerospace applications. The general organisation of this
8、 series is described in EN 4385. This standard is a level 2 document as defined in EN 4385. 1 Scope This standard defines the general requirements for the determination of warp bow of narrow woven fabrics by measurement testing. 2 Normative references This European Standard incorporates by dated or
9、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 European Standard only wh
10、en incorporated in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 4415, EN 4385, Aerospace series - Non-metallic materials - Textiles - Narrow woven fabrics - Technical specification 1 ) Aerospace series - Non-metallic materials - Ge
11、neral organisation of standardisation - Links between fypes of standards ) 3 Definitions and abbreviations 3.1 Definitions For the purposes of this standard, the following definitions apply: 3.1.1 warp bow the deformation (or deflexion “f“) which a narrow woven fabric takes in its plane with respect
12、 to the rectilinear and parallel edges which it should have. 3.2 Abbreviations No requirements 1) Published as AECMA Prestandard at the date of publication of this standard Page 4 prEN 4429:2005 4 Health and safety This standard does not necessarily include all health and safety requirements, associ
13、ated with its use. Persons using this standard shall be familiar with normal laboratory / test house practices. It is the responsibility of the user to establish satisfactory health and safety practices and to ensure conformity with any European, National or local laws / regulations. 5 Principle/tec
14、hnique The test consists in measuring the warp bow of a narrow woven fabric laid on a plane surface after conditioning. 6 Resources 6.1 Apparat us/faci I ities The characteristics of the test methods are listed as follows: - A test plate of dimensions (1 200 I:) mm x (200 g) mm on which its longitud
15、inal axis is traced (see Figure 1). - A ruler having a minimum length of 1 m and accurate to one millimetre. - A set square having minimum dimensions of (1 O0 x 150) mm with a scale in mm on its longest side and accurate to one millimetre. 6.2 Materia IdReagents No requirements 6.3 Qualification of
16、personnel No requirements 7 Test samples/Test pieces Cut three test pieces of a length of (1 200 - ) mm. 8 Testing procedure 8.1 Test piece conditioning Specimens shall be conditioned faced flat for at least 24 h, without any tension in a standard conditioning atmosphere according to EN 4415 and mai
17、ntained in this atmosphere until the tests have been carried out. Page 5 prEN 4429:2005 8.2 Testing procedure The tests shall be performed in a standard atmosphere according to EN 4415. - Lay the specimen flat without tension, approximately along the longitudinal axis of the test plate by “tapping“
18、it, if necessary, but taking care not to incurvate or redress it. - Leave it aside for at least 1 min. - Position the ruler to make the graduations O mm and 1 O00 mm coincide with the specimens inside border (see Figure 2). - Place the set square along the ruler taking care to not move the specimen
19、and measure the maximum distance, in millimetres, between the specimens inside edge and the ruler. - Repeat this procedure for the other two specimens. 9 Expression of results Calculate the arithmetic mean of the three values and express it in millimetres. 1 O Measurement uncertainties The precision
20、 of this test method is not known because interlaboratory data are not available. 11 Designation EXAMPLE: EN 4429 12 Testreport This test report shall include: - reference to the test method designation; - any other information relevant to the test method (test condition, test equipment, test proced
21、ure); - identification and traceability of the product to be tested, in accordance with the technical specification; - identification and traceability of the test pieces taken from the samples (number, preparation, method, conditioning, origin); - expression of results (individual values and arithmetic mean); - traceability to individual performing the test work; - any incident which may have affected the results; - any deviation from the test method standard; - date of test. Page 6 prEN 4429:2005 Figure 1 Figure 2
