Test method for the mechanical strength of cores made of magnetic oxides

IEC 61631:2020 is available as IEC 61631:2020 RLV which contains the International Standard and its Redline version, showing all changes of the technical content compared to the previous edition.
IEC 61631:2020 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, I-cores and ring-cores but other core types such as U-cores could be tested according to a derived method agreed by the parties concerned. This document is also applicable to the mechanical strength measurement of magnetic powder cores. This edition includes the following significant technical changes with respect to the previous edition:
- the phrase: "This document is also applicable to the mechanical strength measurement of magnetic powder cores" has been added in the scope;
- IEC 61246 has been replaced by IEC 63093-8; EN 1002-2 has been replaced by ISO 7500-1; ISO 4677-1 and ISO 4677-2 have been withdrawn;
- dimensions D and F in Figure A.1 and Table A.1 have been changed to be consistent with Figure 1 of IEC 63093-8:2018;
- addition of the content of ring-cores test;
- addition of Annex B;
- the location of the jig is amended in Figure 3;
- in Figure 5, the roller bars are moved to the edge of the I-core, aligned with the core.

Méthode d'essai pour la résistance mécanique des noyaux en oxydes magnétiques

IEC 61631:2020 est disponible sous forme de IEC 61631:2020 RLV qui contient la Norme internationale et sa version Redline, illustrant les modifications du contenu technique depuis l'édition précédente.
IEC 61631:2020 spécifie une méthode d'essai pour la résistance mécanique des noyaux en oxydes magnétiques. Cette méthode d'essai est adaptée à la plupart des noyaux E, noyaux ETD, noyaux I et noyaux toriques, mais d'autres types de noyaux tels que les noyaux en U peuvent être soumis aux essais selon une méthode dérivée convenue par les parties concernées. Le présent document est également applicable au mesurage de la résistance mécanique des noyaux en poudre magnétique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:  
la phrase "Le présent document est également applicable au mesurage de la résistance mécanique des noyaux en poudre magnétique" a été ajoutée au domaine d’application;
l’IEC 61246 a été remplacée par l’IEC 63093-8; l’EN 1002-2 a été remplacée par l’ISO 7500-1; l’ISO 4677-1 et l’ISO 4677-2 ont été supprimées;
les dimensions D et F dans la Figure A.1 et le Tableau A.1 ont été modifiées pour se conformer à la Figure 1 de l’IEC 63093-8:2018;
ajout du contenu de l’essai des noyaux toriques;
ajout de l’Annexe B;
l’emplacement du gabarit est modifié dans la Figure 3;
dans la Figure 5, les barres de roulement sont déplacées au bord du noyau I, alignées avec le noyau.

General Information

Status
Published
Publication Date
06-May-2020
Current Stage
PPUB - Publication issued
Completion Date
07-May-2020
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IEC 61631
Edition 2.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Test method for the mechanical strength of cores made of magnetic oxides
Méthode d'essai pour la résistance mécanique des noyaux en oxydes
magnétiques
IEC 61631:2020-05(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61631
Edition 2.0 2020-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Test method for the mechanical strength of cores made of magnetic oxides
Méthode d'essai pour la résistance mécanique des noyaux en oxydes
magnétiques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.100.10 ISBN 978-2-8322-9051-4

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61631:2020 © IEC 2020
CONTENTS

FOREWORD ........................................................................................................................... 3

INTRODUCTION ..................................................................................................................... 5

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 6

4 Apparatus ........................................................................................................................ 6

4.1 Test core support and loading wedge ...................................................................... 6

4.2 Testing device ........................................................................................................ 7

4.3 Humidity measuring device ..................................................................................... 7

5 Test cores ....................................................................................................................... 7

5.1 General ................................................................................................................... 7

5.2 Number of test cores ............................................................................................... 7

5.3 Precautions ............................................................................................................. 7

6 Testing ............................................................................................................................ 7

6.1 Test conditions ....................................................................................................... 7

6.2 Test procedures ...................................................................................................... 7

6.2.1 General ........................................................................................................... 7

6.2.2 Test of E-cores ................................................................................................ 8

6.2.3 Test of I-cores ............................................................................................... 10

6.2.4 Test of ring-cores .......................................................................................... 10

Annex A (normative) Standard dimensions of E-cores and their support

for strength test .................................................................................................................... 13

A.1 General ................................................................................................................. 13

A.2 Designation ........................................................................................................... 13

A.3 Test core support .................................................................................................. 13

Annex B (normative) Standard dimensions of ring-cores and methods for strength test ........ 15

B.1 General ................................................................................................................. 15

B.2 Selection of mechanical strength test method for ring-core ................................... 15

Bibliography .......................................................................................................................... 16

Figure 1 – E test ..................................................................................................................... 8

Figure 2 – W test .................................................................................................................... 9

Figure 3 – T test ..................................................................................................................... 9

Figure 4 – M test ................................................................................................................... 10

Figure 5 – I test .................................................................................................................... 10

Figure 6 – Stretching method ................................................................................................ 11

Figure 7 – Shearing method .................................................................................................. 12

Figure 8 – Pressure method .................................................................................................. 12

Figure A.1 – Designation of E-core ....................................................................................... 13

Figure B.1 – Dimensions of ring-core .................................................................................... 15

Table A.1 – Test core support ............................................................................................... 14

Table B.1 – Ring-core dimension designations ...................................................................... 15

---------------------- Page: 4 ----------------------
IEC 61631:2020 © IEC 2020 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
TEST METHOD FOR THE MECHANICAL STRENGTH
OF CORES MADE OF MAGNETIC OXIDES
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.

International Standard IEC 61631 has been prepared by IEC technical committee 51:

Magnetic components, ferrite and magnetic powder materials.

This second edition cancels and replaces the first edition published in 2001. This edition

constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:

a) the phrase: "This document is also applicable to the mechanical strength measurement of

magnetic powder cores" has been added in the scope;
b) IEC 61246 has been replaced by IEC 63093-8; EN 1002-2 has been replaced by
ISO 7500-1; ISO 4677-1 and ISO 4677-2 have been withdrawn;

c) dimensions D and F in Figure A.1 and Table A.1 have been changed to be consistent with

Figure 1 of IEC 63093-8:2018;
d) addition of the content of ring-cores test;
e) addition of Annex B;
---------------------- Page: 5 ----------------------
– 4 – IEC 61631:2020 © IEC 2020
f) the location of the jig is amended in Figure 3;

g) in Figure 5, the roller bars are moved to the edge of the I-core, aligned with the core.

The text of this International Standard is based on the following documents:
CDV Report on voting
51/1312/CDV 51/1333/RVC

Full information on the voting for the approval of this International Standard can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to

the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
---------------------- Page: 6 ----------------------
IEC 61631:2020 © IEC 2020 – 5 –
INTRODUCTION

The method specified in this document is intended to be used for obtaining 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 errors that can arise as a consequence of the test method.

All other factors are stated in the test report for comparison of the behavior of the magnetic

oxide cores. It is not possible to rigorously standardize particular surface finishes, since it is

difficult to control all the mechanical factors. But the state of the surface in the report should

be mentioned, 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, multi-axial stressing, other rates of stressing or 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 concentration).

The results of strength tests are influenced by a combination of the following factors: the

microstructure 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 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 are interpreted with caution.

---------------------- Page: 7 ----------------------
– 6 – IEC 61631:2020 © IEC 2020
TEST METHOD FOR THE MECHANICAL STRENGTH
OF CORES MADE OF MAGNETIC OXIDES
1 Scope

This document 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, I-cores and ring-

cores but other core types such as U-cores could be tested according to a derived method

agreed by the parties concerned. This document is also applicable to the mechanical strength

measurement of magnetic powder cores.
2 Normative references

The following documents are referred to in the text in such a way that some or all of their

content constitutes requirements of this document. For dated references, only the edition

cited applies. For undated references, the latest edition of the referenced document (including

any amendments) applies.

ISO 7500-2, Metallic materials – Verification of static uniaxial testing machines – Part 2:

Tension creep testing machines – Verification of the applied force
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
mechanical strength

maximum recorded force at the instant of fracture of a magnetic oxide core when it is loaded

with the bending stress
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, the roller bars and the stretch bar or the flat support

shall be made of hardened steel with a hardness of 40 HRC (HRC is Rockwell hardness) to

60 HRC. The loading wedge and the roller bars shall have a radius of 2 mm. The radius of the

contact part of the stretching rod head and the measured core is 2 mm. The loading wedge

and the stretch bar shall be connected to a device for measuring and recording the load

applied.
---------------------- Page: 8 ----------------------
IEC 61631:2020 © IEC 2020 – 7 –
4.2 Testing device

The testing device shall be a mechanical testing machine capable of applying 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 1 % of

the indicated load. The force calibration of the machine shall be checked in accordance with

ISO 7500-2.
4.3 Humidity measuring device

A humidity measuring device, such as, but not limited to, an aspirated psychrometer or

whirling psychrometer that is capable of measuring relative humidity to an accuracy of ±2 %

shall be used.
5 Test cores
5.1 General

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 the Introduction).
5.2 Number of test cores

For material development, characterization or quality checking, the minimum number of test

cores shall be five pieces. For statistical evaluation of strength data (for example, Weibull

parameters), the minimum number shall be thirty.

For comparison of data for different materials, it is important that the number of 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.
5.3 Precautions

The prepared 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

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 accordance with 6.2.2.2, 6.2.2.3,

6.2.2.4, 6.2.2.5, 6.2.3, 6.2.4.2.2, 6.2.4.2.3 or 6.2.4.2.4 as applicable (see Figure 1 to Figure 8).

For standard dimensions of E-cores and their support for strength test see Annex A.

---------------------- Page: 9 ----------------------
– 8 – IEC 61631:2020 © IEC 2020

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 test of I-cores is only recommended for flat-

shaped test cores such as antenna rods. The test method of stretching, shearing and

pressure is only applicable to ring-cores. 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. The test

force shall then be applied at a loading rate of between 5 mm/min and 20 mm/min until the

test core fractures. 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 Test of E-cores
6.2.2.1 Dimensions
The specifications and dimensions of E-cores are according to IEC 63093-8.
6.2.2.2 E test

For test core sizes equal to or larger than E13, the test core shall be placed on roller bars as

shown in Figure 1. For test core 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.
Dimensions in millimeters
Figure 1 – E test
6.2.2.3 W test

For test core sizes equal to or larger than E13, the test core shall be placed on roller bars as

shown in Figure 2. For test core sizes less than E13, the test core 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.
---------------------- Page: 10 ----------------------
IEC 61631:2020 © IEC 2020 – 9 –
Dimensions in millimeters
Figure 2 – W test
6.2.2.4 T test

The test core shall be placed as shown in Figure 3. For test core sizes equal to or larger than

E32, the load 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.
Dimensions in millimeters
Figure 3 – T test
6.2.2.5 M test

For test core sizes equal to or larger than 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.
---------------------- Page: 11 ----------------------
– 10 – IEC 61631:2020 © IEC 2020
Dimensions in millimeters
Figure 4 – M test
6.2.3 Test of I-cores

For test core sizes equal to or larger than 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.
Dimensions in millimeters
Figure 5 – I test
6.2.4 Test of ring-cores
6.2.4.1 Dimensions

The specifications and dimensions of ring-cores are according to IEC 63093-12. For standard

dimensions of ring-cores and methods for strength test see Annex B.
---------------------- Page: 12 ----------------------
IEC 61631:2020 © IEC 2020 – 11 –
6.2.4.2 Ring test
6.2.4.2.1 General

There are three methods for testing the strength of ring-cores. The method shall be selected

as agreed between the parties concerned. The load shall be applied through the loading

wedge, and the load at the instant of fracture shall be recorded.
6.2.4.2.2 Stretching method
For the stretching method, see Figure 6.
Dimensions in millimeters
Figure 6 – Stretching method
6.2.4.2.3 Shearing method
For the shearing method, see Figure 7.
---------------------- Page: 13 ----------------------
– 12 – IEC 61631:2020 © IEC 2020
Dimensions in millimeters
Figure 7 – Shearing method
6.2.4.2.4 Pressure method
For the pressure method, see Figure 8.
Figure 8 – Pressure method
---------------------- Page: 14 ----------------------
IEC 61631:2020 © IEC 2020 – 13 –
Annex A
(normative)
Standard dimensions of E-cores and their support for strength test
A.1 General

Annex A gives standard dimensions of E-cores specified in IEC 63093-8 and the type of core

support for mechanical strength testing. The nominal dimensions of L and H are calculated

from the nominal values of (B and D) and (A and E) respectively and are rounded off to the

first decimal place.
A.2 Designation
For the designation of an E-core, see Figure A.1.
Figure A.1 – Designation of E-core
A.3 Test core support
The type of test core support is described in Table A.1.
---------------------- Page: 15 ----------------------
– 14 – IEC 61631:2020 © IEC 2020
Table A.1 – Test core support
Dimensions in millimeters
Core size
Parameter

E5,3/2 E6,3/2 E8/2 E8,8/2 E10/3 E13/4 E16/5 E20/6 E25/7 E32/9 E42/15 E42/20 E55/21 E55/25 E65/27

Max. 5,35 6,30 8,15 9,40 10,20 13,10 16,70 20,80 25,80 32,90 43,00 43,00 56,20 56,20 66,50

Min. 5,15 6,05 7,85 8,60 9,80 12,20 15,50 19,40 24,30 31,30 41,30 41,30 54,10 54,10 63,80

Max. 2,73 2,90 4,05 4,15 5,00 6,50 8,20 10,20 12,80 16,40 21,20 21,20 27,80 27,80 32,80

Min. 2,57 2,80 3,95 3,85 4,88 6,30 7,90 9,80 12,30 15,80 20,80 20,80 27,20 27,20 32,20

Max. 2,00 2,00 2,40 2,02 3,00 3,70 4,70 5,90 7,50 9,50 15,20 20,00 21,00 25,00 27,40

Min. 1,90 1,90 2,30 1,78 2,88 3,40 4,30 5,40 6,90 8,80 14,70 19,20 20,40 24,20 26,60

Max. 1,92 2,05 2,95 2,40 3,62 4,80 6,10 7,40 9,20 11,80 15,50 15,50 19,30 19,30 23,00

Min. 2,08 1,85 2,85 2,03 3,50 4,50 5,70 7,00 8,70 11,20 14,80 14,80 18,50 18,50 22,20

Max. 4,00 3,80 5,80 5,33 7,30 9,50 11,90 14,70 18,30 23,70 30,70 30,70 38,70 38,70 45,70

Min. 3,80 3,60 5,60 5,07 7,00 8,90 11,30 14,10 17,50 22,70 29,50 29,50 37,50 37,50 44,20

Max. 1,40 1,40 2,40 2,02 3,00 3,70 4,70 5,90 7,50 9,50 12,20 12,20 17,20 17,20 20,00

Min. 1,30 1,30 2,30 1,78 2,88 3,40 4,40 5,50 7,00 8,90 11,70 11,70 16,70 16,70 19,30

L Nom. 0,3 0,5 0,6 0,9 0,7 0,9 1,1 1,4 1,8 2,3 2,9 2,9 4,3 4,3 5,0
H Nom. 0,3 0,6 0,6 1,0 0,7 0,9 1,1 1,4 1,8 2,2 3,0 3,0 4,3 4,3 5,0
a c
E-mode A a a a a R R R R R R R R R R
M-mode a a a a a R R R R R R R R R R
Test core support
W-mode a a a a a R R R R R R R R R R
T-mode B b b b b b b b b R R R R R R
Flat support is used.
Jigs are used, which shall be agreed between the parties concerned.
R: Roller bars are used.

The tolerance of the position shall be ±0,1 mm for L, with H ≤ 1,0 mm, and ±10 % for L, with H > 1,0 mm.

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IEC 61631
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