CEN/TR 18048:2024
(Main)Methods of determination of the mechanical properties of self-bonding coating assemblies related to non-oriented electrical steels
Methods of determination of the mechanical properties of self-bonding coating assemblies related to non-oriented electrical steels
This document describes the mechanical testing methods, relevant for self-bonding coating assemblies with non-oriented electrical steels. In particular, it describes the mechanical testing methods, sample preparation, calibration methods, necessary to obtain reliable results that can be considered a reference for quality evaluation.
This document applies only to self-bonding coatings of non-oriented electrical steels.
Verfahren zur Bestimmung der mechanischen Eigenschaften von Backlackverbunden bezogen auf nicht kornorientiertes Elektroband und -blech
Méthodes de détermination des caractéristiques mécaniques des assemblages à base de vernis thermocollant dédiés aux aciers électriques à grains non orientés
Le présent document décrit les méthodes d'essais mécaniques applicables aux assemblages de revêtements thermocollants avec des aciers électriques non orientés. En particulier, il décrit les méthodes d'essai mécaniques, la préparation d'échantillons, les méthodes d’étalonnage, nécessaires afin d’obtenir des résultats fiables qui peuvent être considérés comme une référence lors de l’évaluation de la qualité.
Le présent document ne s’applique qu’aux revêtements thermocollants des aciers électriques non orientés. Les essais peuvent être réalisés indépendamment du temps écoulé entre la production de l'acier électrique revêtu et l'évaluation du procédé d’adhérence de l'empilage assemblé.
Metode določanja mehanskih lastnosti samolepilnih premaznih sklopov, povezanih z neorientiranimi električnimi jekli
Ta dokument opisuje metode mehanskih preskusov, ki so pomembni za samolepilne premazne sklope, povezane z neorientiranimi električnimi jekli. Predvsem opisuje mehanske preskusne metode, pripravo vzorcev in kalibracijske metode, potrebne za pridobitev zanesljivih rezultatov, ki se lahko štejejo kot referenca pri vrednotenju kakovosti.
Ta dokument se uporablja samo za samolepilne premaze neorientiranih električnih jekel.
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2024
Metode določanja mehanskih lastnosti samolepilnih premaznih sklopov,
povezanih z neorientiranimi električnimi jekli
Methods of determination of the mechanical properties of self-bonding coating
assemblies related to non-oriented electrical steels
Verfahren zur Bestimmung der mechanischen Eigenschaften von Backlackverbunden
bezogen auf nicht kornorientiertes Elektroband und -blech
Méthodes de détermination des caractéristiques mécaniques des assemblages à base
de vernis thermocollant dédiés aux aciers électriques à grains non orientés
Ta slovenski standard je istoveten z: CEN/TR 18048:2024
ICS:
77.140.50 Ploščati jekleni izdelki in Flat steel products and semi-
polizdelki products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
CEN/TR 18048
TECHNICAL REPORT
RAPPORT TECHNIQUE
February 2024
TECHNISCHER REPORT
ICS 77.140.50
English Version
Methods of determination of the mechanical properties of
self-bonding coating assemblies related to non-oriented
electrical steels
Méthodes de détermination des caractéristiques Verfahren zur Bestimmung der mechanischen
mécaniques des assemblages à base de vernis Eigenschaften von Backlackverbunden bezogen auf
thermocollant dédiés aux aciers électriques à grains nicht kornorientiertes Elektroband und -blech
non orientés
This Technical Report was approved by CEN on 12 February 2024. It has been drawn up by the Technical Committee CEN/TC
459/SC 8.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. CEN/TR 18048:2024 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Floating roller test . 5
5 Lap-shear test . 6
6 T-peel test . 7
7 Pull off test . 7
8 Testing at different temperatures. 7
9 Thermal endurance . 8
10 Environmental endurance . 8
Bibliography . 9
European foreword
This document (CEN/TR 18048:2024) has been prepared by Technical Committee CEN/TC 459/SC 8
“Steel sheet and strip for electrical applications”, the secretariat of which is held by DIN.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
Introduction
EN 10342 describes the electrical steel coating types. The electrical steels ordered according to standards
EN 10106, EN 10265, EN 10303, EN 10341 are supplied either with or without such a coating.
CEN/TR 18048 describes the measurements necessary to qualify these coatings.
The particular case of self-bonding coatings (also called bondable coatings) have as additional
specification, beyond providing an insulation layer, to assure a glued connection between superposed
laminations. This implies the strength of this bonded assembly needs to be assessed, for qualification
purposes. This multi-material assembly needs specific precautions for establishing its mechanical
strength level. Different standards exist, but these are not necessarily dedicated to electrical steel
coatings. The lack of a clear description of which evaluation method to use, with which calibration
methods, sample preparation, etc. brings inconsistency in obtained measurement results. The purpose of
this technical report is to overcome the problem of differences in mechanical assessment of self-bonding
coating assemblies, by combining the aspects of Non-Oriented Electrical Steel self-bonding coating
mechanical testing in a clear guideline. This does not involve the mechanical testing of the coating itself,
nor the mechanical testing of the electrical steel itself.
These self-bonding coating types are used in different electric machine applications such as: wind
generators, high efficiency industry machines, automotive traction motors.
1 Scope
This document describes the mechanical testing methods, relevant for self-bonding coating assemblies
with non-oriented electrical steels. In particular, it describes the mechanical testing methods, sample
preparation, calibration methods, necessary to obtain reliable results that can be considered a reference
for quality evaluation.
This document applies only to self-bonding coatings of non-oriented electrical steels. The tests can be
performed regardless of the time lapse between the coated electrical steel production and the evaluation
of the bonding process of the assembled stack.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at https://www.electropedia.org/
— ISO Online browsing platform: available at https://www.iso.org/obp
4 Floating roller test
4.1 General
The purpose of the method is to determine the peel resistance of the adhesive bond in a sample stack,
registering the peel force for each lamination. Identifying the peel force is relevant for a machine stack,
in particular to assure a good shape of the rotor or stator teeth. Also during shrink fitting operations of
the shaft in the rotor or the housing around the stator, it is important that no delamination occurs.
The test as described in EN 1464 represents the reference methodology. The floating roller peel test for
electrical steels, uses samples of self-bonded non-oriented electrical steel stacks consisting of a rigid part
and a peeled off part. Hence, the rigid part is already a stack of bonded laminations.
4.2 Geometries and testing conditions
The cutting method for producing the testing strips can lead to the formation of burrs. Appropriate
methods to avoid the influence of these burrs on the outcome of the floating roller peel test, can be to
stack the strips with the burrs in the same direction, or else to deburr the edges.
The thickness of the rigid part after completing the test is at least 2,5 mm and the thickness of the peeled
off part is related to the thickness o
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