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1、a Date: 18 September 2007 Origin: European Latest date for receipt of comments: 14 December 2007 Project no.: 1993/02383 Responsible committee: ACE/61/-/6 Mechanical testing of metallic materials Interested committees: ACE/61 Title: EN 3238 Aerospace series - Metallic materials - Test method - Shear
2、 test for wires and rivets Supersession information: If this document is published as a standard, the UK implementation of it will supersede NONE and partially supersede. NONE If you are aware of a current national standard which may be affected, please notify the secretary (contact details below).
3、WARNING: THIS IS A DRAFT AND MUST NOT BE REGARDED OR USED AS A BRITISH STANDARD. THIS DRAFT IS NOT CURRENT BEYOND 14 December 2007. This draft is issued to allow comments from interested parties; all comments will be given consideration prior to publication. No acknowledgement will normally be sent.
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8、bsi- Draft for Public Comment Head Office 389 Chiswick High Road London W4 4AL Telephone: +44(0)20 8996 9000 Fax: +44(0)20 8996 7001 Form 36 Version 7.0 DPC: 07/30171301 DC Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Cop
9、y, (c) BSI b Introduction This draft standard is based on European discussions in which the UK has taken an active part. Your comments on this draft are welcome and will assist in the preparation of the consequent British Standard. If no comments are received to the contrary, then the UK will approv
10、e this draft and implement it as a British Standard. Comment is particularly welcome on national, legislative or similar deviations that may be necessary. Even if this draft standard is not approved by the UK, if it receives the necessary support in Europe, the UK will be obliged to publish the offi
11、cial English Language text unchanged as a British Standard and to withdraw any conflicting standard. UK Vote Please indicate whether you consider the UK should submit a negative (with reasons) or positive vote on this draft. Submission The guidance given below is intended to ensure that all comments
12、 receive efficient and appropriate attention by the responsible BSI committee. Annotated drafts are not acceptable and will be rejected. All comments must be submitted, preferably electronically, to the Responsible Committee Secretary at the address given on the front cover. Comments should be compa
13、tible with Version 6.0 or Version 97 of Microsoft Word for Windows, if possible; otherwise comments in ASCII text format are acceptable. Any comments not submitted electronically should still adhere to these format requirements. All comments submitted should be presented as given in the example belo
14、w. Further information on submitting comments and how to obtain a blank electronic version of a comment form are available from the BSI web site at: http:/www.bsi- Template for comments and secretariat observations Date: xx/xx/200x Document: ISO/DIS xxxxx 1 2 (3) 4 5 (6) (7) MB Clause No./ Subclause
15、 No./ Annex (e.g. 3.1) Paragraph/ Figure/Table/ Note (e.g. Table 1) Type of com- ment Comment (justification for change) by the MB Proposed change by the MB Secretariat observations on each comment submitted 3.1 Definition 1 ed Definition is ambiguous and needs clarifying. Amend to read . so that th
16、e mains connector to which no connection . 6.4 Paragraph 2 te The use of the UV photometer as an alternative cannot be supported as serious problems have been encountered in its use in the UK. Delete reference to UV photometer. Microsoft and MS-DOS are registered trademarks, and Windows is a tradema
17、rk of Microsoft Corporation. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI DRAFT prEN 3238 Date : 11/99 Edition : P1 STUDY : C5-24J DRAFT N : 7 STAGE : 20 Ref.: C5/WT5 Superseding Ref.: _ ENGLISH VERSION Aero
18、space series Metallic materials Test method Shear test for wires and rivets Srie arospatiale Luft- und Raumfahrt Matriaux mtalliques Metallische Werkstoffe Mthodes dessais Prfverfahren Essai de cisaillement pour fils et rivets Prfung der Scherfestigkeit von Drhten und Nieten Master document : X en f
19、r de Sponsor : Mr D-L WILLIAMS THE EUROPEAN ASSOCIATION OF AEROSPACE INDUSTRIES - STANDARDIZATION Gulledelle 94, B - 1200 Bruxelles Tel. : (32) 2 775 8110 Fax.: (32) 2 775 8111 Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled
20、 Copy, (c) BSI Page 2 prEN 3238 : 1999 Contents 0 Introduction 1 Scope 2 References 3 Principle 4 Symbols and designations 5 Testing equipment 6 Test pieces 7 Procedure 8 Test report Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncont
21、rolled Copy, (c) BSI Page 3 prEN 3238 : 1999 0 Introduction This standard is part of the series of EN metallic material standards for aerospace applications. The general organization of this series is described in EN 4258. 1 Scope This standard specifies the requirements for shear testing rivet wire
22、 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 the drawing, order or inspection schedule. 2 References This European Standard incorporates by dated or undated refe
23、rence 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 when incorpora
24、ted in it by amendment or revision. For undated references the latest edition of the publication referred to applies. EN 4258 Aerospace series - Metallic materials - General organization of standardization - Links between types of EN standards and their use EN 4259 Aerospace series - Metallic materi
25、als - Definitions of general terms 1) EN 10002-2 Metallic materials - Tensile testing - Part 2 : Verification of the force measuring system of the tensile testing machines ISO 286-1-1988 ISO System of limits and fits - Part 1 : Bases of tolerances deviations and fits 3 Definitions For the purposes o
26、f this standard, the following definitions apply : 3.1 General terms See EN 4259. 3.2 Other terms 3.2.1 Shear strength Shear strength (Rc) is given by : Rc = o 2S Fm or Rc = o d F 2 m where : do is the original diameter of the test piece ; Fm is the maximum force ; So is the original cross-sectional
27、 area of the test piece. _ 1) Published as AECMA Prestandard at the date of publication of this standard Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 4 prEN 3238 : 1999 3.2.2 Symbols and units See table
28、 1. Table 1 : Symbols and units Symbol Parameter Unit Rc Shear strength MPa Fm Maximum force N So Original test piece cross section mm do Original diameter of the test piece mm d1 Inside diameter of the inner shearing device mm d2 Outside diameter of the inner shearing device mm h Distance between b
29、ottom of housing and lower part of inner shearing device mm l1 Length of the outer shearing device mm l2 Length of the inner shearing device mm Lmin Minimum length of the test piece mm 4 Health and safety Resources, test pieces, test samples, test materials, test equipment and test procedures shall
30、comply with the current health and safety regulations/laws of the countries where the test is carried out. 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 shea
31、r test consists of subjecting a wire, rivet or test piece of circular cross-section test piece to shearing in double shear. 6 Testing requirements 6.1 Resources 6.1.1 Equipment/plant tensile testing machine verified in accordance with EN 10002-2 ; compression testing machine verified in accordance w
32、ith EN 10002-2 ; shearing device for compression testing machine ; shearing device for tensile testing machine ; shearing devices shall consist of the following components : housing housing socket slide slide socket to the dimensions shown in table 2 ; shearing device sockets shall have a hardness o
33、f : for aluminium and aluminium alloys 500 HV minimum ; for other alloys 700 HV minimum. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 5 prEN 3238 : 1999 The shearing devices need not conform to the pict
34、orial representation but the dimensions specified and surface roughness shall be maintained. Table 2 Shearing devices d1 Tolerance Shearing device corresponding d2 h min. L1 L2 Test piece to tolerance zone 1) d0 Tolerance L min. 2 + 0 0.100 2 - 0,020 - 0,370 3 + 0 0.100 3 - 0,020 - 0,370 1 4 + 0 0.1
35、20 H12 4 - 0,030 - 0,390 5 + 0 0.120 30 35 15 20 5 - 0,030 - 0,390 50 6 + 0 0.075 H11 6 - 0,030 - 0,345 8 + 0 0.090 8 - 0,040 - 0,370 10 + 0 0.022 10 - 0,013 - 0,186 12 + 0 0.027 12 - 0,016 - 0,193 110 2 14 + 0 0.027 H8 45 50 30 50 14 - 0,016 - 0,193 16 + 0 0.027 16 - 0,016 - 0,193 18 + 0 0.033 18 -
36、 0,016 - 0,193 3 20 + 0 0.033 H8 45 50 40 50 20 - 0,020 - 0,212 130 25 + 0 0.033 25 - 0,020 - 0,212 1) According to ISO 286-1-1988 NOTE : If the actual size of wire (do) is different from dimensions given in table 2, a shearing device with an appropriate inside diameter (d1) consistent with other pa
37、rameters of table 2 shall be used. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 6 prEN 3238 : 1999 6.1.2 Materials/reagents degreasing fluids ; test record sheet or test log book or equivalent. 6.1.3 Qu
38、alification 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 dimensions Unless oth
39、erwise specified by the technical or material standard, drawing or order, cylindrical test pieces (wire or rivets) with an original diameter (do) and length (Lmin) according to table 2 shall be used. When materials with a tensile strength exceeding 1000 MPa are to be tested, test pieces of diameter
40、(do) within the range 2 mm to 16 mm may be used. 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 C 5 C. 6.3.2 Method of test 6.3.2.1 Place the shearing device with sockets
41、 corresponding to the original test piece diameter (do) 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 f
42、rictional forces are sufficiently low as to cause negligible deviation of the force indicator. 6.3.2.3 Measure the original test piece diameter (do) 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 th
43、e maximum force and determine the shear stress in accordance with clause 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. 6.4 Expression of results Results shall be expressed as specified in the relevant technical standard,
44、drawing or order. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI Page 7 prEN 3238 : 1999 7 Test report All results shall be in written form and the test report shall include, when relevant, at least the follow
45、ing information : reference to this test method ; any other information relevant to the test method(s), (e.g. test condition, test equipment, test procedure, verification) ; identification and traceability of the semi-finished product to be tested in accordance with the technical specification ; ide
46、ntification and traceability of test samples taken from the semi-finished product (e.g. location, orientation, size) ; identification and traceability of test pieces taken from test samples (e.g. number, preparation, method, condition) ; In certain cases the test piece may be the test sample : expre
47、ssion of results (e.g. individual values or mean values, units) ; recorded plots/graphs, when necessary ; date of test ; traceability to individual performing the test work ; any incident which may have affected the results ; any deviation from the test method standard. Licensed Copy: London South Bank University, London South Bank University, Fri Oct 05 02:45:10 GMT+00:00 2007, Uncontrolled Copy, (c) BSI