1、ASD STANDARD NORME ASD ASD NORM prEN 3238 Edition P 1 July 2009 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATIONAvenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 775 8131 - www.asd-stan.orgICS: Descriptors: ENGLISH VERSION Aerospa
2、ce series Metallic materials Test method Shear test for wires and rivets Srie arospatiale Matriaux mtalliques Mthodes dessais Essai de cisaillement pour fils et rivets Luft- und Raumfahrt Metallische Werkstoffe Prfverfahren Prfung der Scherfestigkeit von Drhten und Nieten This “Aerospace Series“ Pre
3、standard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Industry. It has been technically approved by the experts of the concerned Domain following member c
4、omments. Subsequent to the publication of this Prestandard, 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 agreement of ASD-STAN, it w
5、ill 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 national standard and by w
6、ithdrawing any national standards conflicting with the EN. Edition approved for publication 31 July 2009 Comments should be sent within six months after the date of publication to ASD-STAN Metallic Material Domain Copyright 2009 by ASD-STAN prEN 3238:2009 (E) 2 Contents Page Foreword2 Introduction .
7、3 1 Scope 3 2 Normative references 3 3 Definitions, parameters and symbols3 4 Health and safety .4 5 Principle4 6 Testing requirements 5 7 Test report 7 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Metallic Material Domain. After inquiries and votes carried ou
8、t in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publication. prEN 3238:2009 (E) 3 Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The general organization of
9、 this series is described in EN 4258. 1 Scope This standard specifies the requirements for shear testing rivet wire and rivets in metallic materials for aerospace applications. It shall be applied when referred to in the EN technical specification or material standard unless otherwise specified on t
10、he drawing, order or inspection schedule. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amend
11、ments) applies. ISO 286-1:1988, ISO system of limits and fits Part 1: Bases of tolerances, deviations and fits. EN ISO 7500-1, Metallic materials Verification of static uniaxial testing machines Part 1: Tension/ compression testing machines Verification and calibration of the force-measuring system.
12、 EN 4259, Aerospace series Metallic materials Definition of general terms. 1)3 Definitions, parameters and symbols For the purposes of this standard, the definitions given in EN 4259 and the parameters and symbols given in Table 1 apply. 3.1 General terms See EN 4259. 1) Published as ASD Prestandard
13、 at the date of publication of this standard. prEN 3238:2009 (E) 4 3.2 Other terms 3.2.1 Shear strength Shear strength (Rc) is given by: FmFmRc = 2 Soor Rc = 2 dowhere d0 is the original diameter of the test piece; Fm is the maximum force; So is the original cross-sectional area of the test piece. 3
14、.2.2 Parameters and symbols See Table 1. Table 1 Parameters and symbols Symbol Unit Parameter d0mm Original diameter of the test piece d1mm Inside diameter of the inner shearing device d2mm Outside diameter of the inner shearing device FmN The maximum force which the test piece withstands during the
15、 test h mm Distance between bottom of housing and lower part of inner shearing device l1mm Length of the outer shearing device l2mm Length of the inner shearing device Lmin.mm Minimum length of the test piece RcMPa Shear strength the maximum force (Fm) divided by twice the original cross-sectional a
16、rea (S0) of the test piece S0mm2Original cross-sectional area of the test piece 4 Health and safety Resources, test pieces, test samples, test materials, test equipment and test procedures shall comply with the current health and safety regulations/laws of the countries where the test is carried out
17、. Where equipment, materials and/or reagents which may be hazardous to health are specified, appropriate precautions in conformity with local regulations/laws shall be taken. 5 Principle The shear test consists of subjecting a wire, rivet or test piece of circular cross-section to shearing in double
18、 shear. prEN 3238:2009 (E) 5 6 Testing requirements 6.1 Resources 6.1.1 Equipment/plant tensile or compression testing machines verified in accordance with EN ISO 7500-1; shearing device for compression testing machine (see Figures 1 and 3); shearing device for tensile testing machine (see Figures 2
19、 and 3); shearing devices shall consist of the following components: housing (1); housing socket (2); slide (3); slide socket (4). To the dimensions shown in Table 2. shearing device sockets (2) and (4) of Figure 3 shall have a hardness of: for aluminium and aluminium alloys, 500 HV minimum; for oth
20、er alloys, 700 HV minimum. The shearing devices need not conform to the pictorial representation but the dimensions specified and surface roughness shall be maintained. prEN 3238:2009 (E) 6 Table 2 Test piece d1Tol. d2hL1L2d0Tol. L Shearing devicesShearing device corresponding to tolerance zone a mi
21、n. min.2 2 3 + 0,1000 3 0,020 0,370 4 4 5 + 0,1200 H12 5 0,030 0,390 6 + 0,0750 6 0,030 0,345 18 + 0,0900 H11 303515208 0,040 0,370 50 10 + 0,0220 10 0,013 0,186 12 12 14 14 216 + 0,0270 H84550305016 0,016 0,193 11018 18 0,016 0,193 20 20 3 25 + 0,0330 H8 45 50 40 50 25 0,020 0,212 130aAccording to
22、ISO 286-1:1988. NOTE If the actual size of wire (d0) is different from dimensions given in Table 2, a shearing device with an appropriate inside diameter (d1) consistent with other parameters of Table 2 shall be used. 6.1.2 Materials/reagents degreasing fluids; test record sheet or test log book or
23、equivalent. 6.1.3 Qualification of personnel Testing to the requirements of this test method shall only be undertaken and/or supervised by personnel who have demonstrated their competence by a suitable education and appropriate training and experience. 6.2 Test samples/test pieces 6.2.1 Test piece d
24、imensions Unless otherwise specified by the technical or material standard, drawing or order, cylindrical test pieces (wire or rivets) with an original diameter (d0) and length (Lmin.) according to Table 2 shall be used. prEN 3238:2009 (E) 7 Where possible, products shall be tested in full section,
25、however for materials with a tensile strength exceeding 1 000 MPa, it is permissible for test pieces of diameter (d0) within the range 2 mm to 16 mm taken from the product to be used. The test piece axis shall be d0/2. NOTE There are currently no rivet wire standards in the ASD-STAN series specifyin
26、g greater than 10 mm diameter. 6.3 Testing procedure 6.3.1 Temperature of test The test shall be carried out at 10 C 35 C, unless otherwise specified. In cases of dispute, the test shall be performed at = (23 5) C. 6.3.2 Method of test 6.3.2.1 Place the shearing device with sockets corresponding to
27、the original test piece diameter (d0) in the machine so that the vertical axis of the device coincides with the line of action of the test force. 6.3.2.2 Set the force indicator to zero. before inserting the test piece in the shearing device. Check that during motion of the slide (3) frictional forc
28、es are sufficiently low as to cause negligible deviation of the force indicator. 6.3.2.3 Measure the original test piece diameter (d0) of the test piece to an accuracy of 0,01 mm. 6.3.2.4 Place the test piece in the shearing device and increase the force slowly until failure. Record the maximum forc
29、e and determine the shear strength in accordance with 3.2.1. 6.3.2.5 After testing remove the sheared parts of the test piece taking care that no fragments remain in the sockets (2) and (4). 6.4 Expression of results Results shall be expressed as specified in the relevant technical standard, drawing
30、 or order. 7 Test report All results shall be in written form and the test report shall include, when relevant, at least the following information: reference to this test method; any other information relevant to the test method(s), (e.g. test condition, test equipment, test procedure, verification,
31、 ); identification and traceability of the semi-finished product to be tested in accordance with the technical specification; identification and traceability of test samples taken from the semi-finished product (e.g. location, orientation, size); identification and traceability of test pieces taken
32、from test samples (e.g. number, preparation, method, condition). prEN 3238:2009 (E) 8 In certain cases the test piece may be the test sample: expression of results (e.g. individual values or mean values, units, ); recorded plots/graphs, when necessary; date of test; traceability to individual perfor
33、ming the test work; any incident which may have affected the results; any deviation from the test method standard. Key 1 Test piece Key 1 Test piece Figure 1 Shearing device for compression testing machine Figure 2 Shearing device for tensile testing machine prEN 3238:2009 (E) 9 Key 1 One hardened socket in slide 2 Slide 3 Only points to section through slide 4 Only points to section through housing 5 Test piece 6 Lock screw 7 Housing 8 Two hardened sockets in housing Figure 3 Assembly of shear test device
