1、BRITISH STANDARD BS EN 61631:2001 Test method for the mechanical strength of cores made of magnetic oxides The European Standard EN 61631:2001 has the status of a British Standard ICS 29.100.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS EN 61631:2001 This British Standa
2、rd, having been prepared under the direction of the Electrotechnical Sector Policy and Strategy Committee, was published under the authority of the Standards Policy and Strategy Committee on 31 October 2001 BSI 31 October 2001 ISBN 0 580 38613 9 National foreword This British Standard is the officia
3、l English language version of EN 61631:2001. It is identical with IEC 61631:2001 The UK participation in its preparation was entrusted to Technical Committee EPL/51, Transformers, Inductors, Magnetic components and ferrite materials, which has the responsibility to: A list of organizations represent
4、ed on this committee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence
5、Index”, or by using the “Find” facility of the BSI Standards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itsel
6、f confer immunity from legal obligations. aid enquirers to understand the text; present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them
7、in the UK. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 12, an inside back cover and a back cover. The BSI copyright date displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. N
8、o. Date CommentsEUROPEAN STANDARD EN 61631 NORME EUROPENNE EUROPISCHE NORM October 2001 CENELEC European Committee for Electrotechnical Standardization Comit Europen de Normalisation Electrotechnique Europisches Komitee fr Elektrotechnische Normung Central Secretariat: rue de Stassart 35, B - 1050 B
9、russels 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members. Ref. No. EN 61631:2001 E ICS 29.100.10 English version Test method for the mechanical strength of cores made of magnetic oxides (IEC 61631:2001) Mthode dessai pour la rsistance mcan
10、ique des noyaux en oxydes magntiques (CEI 61631:2001) Prfverfahren zur Bestimmung der mechanischen Festigkeit von magnetischen Oxidkernen (IEC 61631:2001) This European Standard was approved by CENELEC on 2001-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
11、 stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member. This European S
12、tandard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions. CENELEC members are the na
13、tional electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN 61631:2001 - 2 - Foreword The text of document 51/599/FDIS, f
14、uture edition 1 of IEC 61631, prepared by IEC TC 51, Magnetic components and ferrite materials, was submitted to the IEC-CENELEC parallel vote and was approved by CENELEC as EN 61631 on 2001-09-01. The following dates were fixed: latest date by which the EN has to be implemented at national level by
15、 publication of an identical national standard or by endorsement (dop) 2002-06-01 latest date by which the national standards conflicting with the EN have to be withdrawn (dow) 2004-09-01 Annexes designated “normative“ are part of the body of the standard. In this standard, annexes A and ZA are norm
16、ativ. Annex ZA has been added by CENELEC. _ Endorsement notice The text of the International Standard IEC 61631:2001 was approved by CENELEC as a European Standard without any modification. _ Page2 EN61631:2001 BSI31October200113616 (1002:CEI)E 3 CONTENTS INTRODUCTION 4 1 Scope 5 2 Normative referen
17、ces. 5 3 Definitions 5 4 Apparatus 5 4.1 Test core support and loading wedge 5 4.2 Testing device 6 4.3 Humidity measuring device . 6 5 Test cores 6 5.1 Number of test-cores 6 5.2 Precautions. 6 6 Testing 6 6.1 Test conditions . 6 6.2 Test procedures 6 Annex A (normative) Standard E core dimensions
18、and its support for strength test10 Annex ZA (normative) Normative references to international publications with their corresponding European publications 12 Page3 EN61631:2001 BSI31October2001 4 13616 (1002:CEI)E INTRODUCTION The method specified in this standard is intended to be used for obtainin
19、g agreements between parties for material development, quality checking, characterization and data acquisition purposes. The method places closely defined restrictions on the arrangement of the test-piece and the function of the test apparatus, including the test-jigs, in order to minimize the error
20、s that can arise as a consequence of the test method. All other factors are required to be stated in the test report in order to be allowed for in the comparison of the behavior of the magnetic oxide cores. It is not possible to rigorously standardize particular surface finishes, since it is difficu
21、lt to control all the mechanical factors. But, it is absolutely essential to mention the state of the surface in the report, as surface defects can have a large effect on mechanical strength in certain types of tests (see clause 6). The extrapolation of mechanical strength data to other geometries,
22、to multi-axial stressing, to other rates of stressing or to other environmental conditions, should be viewed with caution. The origin of a fracture in a mechanical test piece can be a valuable guide to the nature and position of strength-limiting defects (such as pores, large grains and impurity con
23、centration). The results of strength tests are influenced by a combination of the following factors: the micro- structure of the material, the surface finishing procedure applied to the test cores, the size and shape of the test cores, the mechanical parameters of the testing apparatus, the rate of
24、load application and the relative humidity of the ambient atmosphere. Because of the ceramic nature of magnetic oxide cores, a considerable range of results is usually obtained from a number of nominally identical test cores. Thus test results need to be interpreted with caution. Page4 EN61631:2001
25、BSI31October200113616 (1002:CEI)E 5 TEST METHOD FOR THE MECHANICAL STRENGTH OF CORES MADE OF MAGNETIC OXIDES 1 Scope This International Standard specifies a test method for the mechanical strength of cores made of magnetic oxides. This test method is suitable for most of the E-cores, ETD-cores and I
26、-cores but other core types such as U-cores could be tested according to a derived method agreed by the parties concerned. 2 Normative references The following normative documents contain provisions which, through reference in this text, constitute provisions of this International Standard. For date
27、d references, subsequent amendments to, or revisions of, any of these publications do not apply. However, parties to agreements based on this International Standard are encouraged to investigate the possibility of applying the most recent editions of the normative documents indicated below. For unda
28、ted references, the latest edition of the normative document referred to applies. Members of ISO and IEC maintain registers of currently valid International Standards. IEC 61246:1994, Magnetic oxide cores (E-cores) of rectangular cross-section and associated parts Dimensions EN 10002-2:1992, Tensile
29、 testing of metallic materials Part 2: Verification of the force measuring system of the tensile testing machine ISO 4677-1:1985, Atmospheres for conditioning and testing Determination of relative humidity Part 1: Aspirated psychrometer method ISO 4677-2:1985, Atmospheres for conditioning and testin
30、g Determination of relative humidity Part 2: Whirling psychrometer method 3 Definitions For the purpose of this International Standard, the following definition applies. 3.1 mechanical strength the maximum recorded force at the instant of fracture of a magnetic oxide core when it is loaded in bendin
31、g 4 Apparatus 4.1 Test core support and loading wedge Test cores shall be supported on free moving roller bars or on a flat support depending on their size (see 6.2). The loading wedge and the roller bars or the flat support shall be made of hardened steel with a hardness of 40 HRC to 60 HRC. The lo
32、ading wedge and the roller bars shall have a radius of 2 mm. The loading wedge shall be connected to a device for measuring and recording the load applied. Page5 EN61631:2001 BSI31October2001 6 13616 (1002:CEI)E 4.2 Testing device The testing device shall be a mechanical testing machine capable of a
33、pplying a force to the loading wedge high enough to break the test core. The machine shall be capable of applying the force at a constant loading-rate. The machine shall be equipped with a device for recording the peak load applied to the test core. The accuracy of the machine shall be in accordance
34、 with EN 10002-2, Grade 1 (accuracy 1 % of the indicated load). Force calibration of the machine shall be checked in accordance with EN 10002-2. 4.3 Humidity measuring device A humidity measuring device shall be as specified in ISO 4677-1 or ISO 4677-2 and shall be capable of measuring relative humi
35、dity to an accuracy of 2 %. 5 Test cores The test cores shall be selected as agreed between the parties concerned. They may be machined to the specified, dimensions, because any machined surface plays an important role in the mechanical strength (see Introduction). 5.1 Number of test-cores For mater
36、ial development, characterization or quality checking, the minimum number of test cores shall be five pieces. For statistical evaluation of strength-data (e.g. Weibull parameters), the minimum number shall be 30. NOTE For comparison of data for different materials, it is important that the number of
37、 specimens is high enough to obtain results with sufficient statistical confidence. Since the confidence limits, in general, depend on the number of test results and their dispersion, the number of test specimens should be decided on the basis of statistical considerations. 5.2 Precautions The prepa
38、red test cores should be handled with care to avoid introduction of additional damage. Test cores should be kept separately at all times, and should be wrapped individually for transport. 6 Testing 6.1 Test conditions The test shall be carried out at an ambient temperature between 15 C and 35 C. The
39、 temperature shall not vary by more than 3 C during the course of a test series. The relative humidity shall be between 45 % and 85 % and shall not vary by more than 10 % during the course of a test series. 6.2 Test procedures 6.2.1 General The test core shall be arranged in the test apparatus in ac
40、cordance with 6.2.2, 6.2.3, 6.2.4, 6.2.5 or 6.2.6 as applicable (see figures 1 to 5). Page6 EN61631:2001 BSI31October200113616 (1002:CEI)E 7 The E-test and W-test can be used for material related purposes, while the M-test and T-test can be used for process related purposes. The I-test is only recom
41、mended for flat shaped test cores such as antenna rods. A preloading force of 5 N to 25 N shall be applied because the upper and lower faces of the test cores are never absolutely parallel. Then the test force shall be applied at a loading rate of between 5 mm/min and 20 mm/min until the test core f
42、ractures. The load at the instant of fracture shall be recorded. The fractured fragments shall be identified and preserved for later fractographic examination. 6.2.2 E-test For test core sizes larger than and equal to E13, the test core shall be placed on roller bars as shown in figure 1. For test c
43、ore sizes less than E13, the test core shall be placed on a flat support as shown in figure 1. The load shall be applied through the loading wedge and the load at the instant of fracture recorded. Figure 1 E-test Roller bars support L 2L L L Load Loading wedge R = 2 mm Flat support L R = 2 mm Core 2
44、L Loading wedge Load Roller bars R = 2 mm L L IEC 930/01 IEC 931/01 Page7 EN61631:2001 BSI31October2001 8 13616 (1002:CEI)E 6.2.3 W-test For test core sizes larger than and equal to E13, the test core shall be placed on roller bars as shown in figure 2. For test core sizes less than E13, the test co
45、re shall be placed on a flat support as shown in figure 2. The load shall be applied through the loading wedge and the load at the instant of fracture recorded. Figure 2 W-test 6.2.4 T-test The test core shall be placed as shown in figure 3. For test core sizes larger than and equal to E32, the load
46、 shall be applied to the core legs from the roller bars as shown in figure 3. For test core sizes less than E32, the load shall be applied through jigs, which shall be agreed between the parties concerned and the load at the instant of fracture recorded. Figure 3 T-test 2H Flat support Roller bars s
47、upport R = 2 mm Roller bars H H 2H Load Loading wedge R = 2 mm Core H H Core Loading wedge R = 2 mm Load IEC 933/01 IEC 932/01 For test core sizes larger than E32 Roller R = 2 mm 2 mm Load Load IEC 934/01 Page8 EN61631:2001 BSI31October200113616 (1002:CEI)E 9 6.2.5 M-test For test core sizes larger
48、than and equal to E13, the test core shall be placed on roller bars as shown in figure 4. For test core sizes less than E13, the test core shall be placed on a flat support as shown in figure 4. The load shall be applied through the loading wedge and the load at the instant of fracture recorded. Fig
49、ure 4 M-test 6.2.6 I-test For test core sizes larger than and equal to I13, the test core shall be placed on roller bars as shown in figure 5. For test core sizes less than I13, the test core shall be placed on a flat support as shown in figure 5. The load shall be applied through the loading wedge and the load at the instant of fracture recorded.Figure 5 I-test Flat support Roller bars support R = 2 mm Core Roller bars R = 2 mm H H L
