SIST EN ISO 10275:2020

Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (ISO 10275:2020)

This document specifies a method for determining the tensile strain hardening exponent n of flat products (sheet and strip) made of metallic materials.
The method is valid only for that part of the stress-strain curve in the plastic range where the curve is continuous and monotonic (see 8.4).
In the case of materials with a serrated stress-strain curve in the work hardening range (materials which show the Portevin-Le Chatelier effect, e.g. AlMg-alloys), the automatic determination (linear regression of the logarithm true stress vs. the logarithm true plastic strain, see 8.7) is used to give reproducible results.

Metallische Werkstoffe - Blech und Band - Bestimmung des Verfestigungsexponenten im Zugversuch (ISO 10275:2020)

Dieses Dokument legt ein Verfahren zur Bestimmung des Verfestigungsexponenten n im Zugversuch von Flacherzeugnissen (Band und Blech) aus metallischen Werkstoffen fest.
Das Verfahren ist nur anwendbar für den plastischen Bereich der Spannung/Dehnung-Kurve, in dem die Kurve kontinuierlich und monoton verläuft (siehe 8.4).
Bei Werkstoffen mit gezackter Spannung/Dehnung-Kurve im Verfestigungsbereich (Werkstoffe mit Portevin Le-Chatelier-Effekt, z. B. AlMg-Legierungen) wird die automatisierte Bestimmung (lineare Regression der logarithmierten wahren Spannung über die logarithmierte wahre plastische Dehnung, siehe 8.7) angewendet, um reproduzierbare Ergebnisse zu erhalten.

Matériaux métalliques - Tôles et bandes - Détermination du coefficient d'écrouissage en traction (ISO 10275:2020)

Le présent document spécifie une méthode pour la détermination du coefficient d'écrouissage en traction, n, des produits plats (tôles et bandes) en matériaux métalliques.
La méthode n'est valable que pour la partie de la courbe contrainte-déformation dans le domaine plastique où la courbe est continue et monotone (voir 8.4).
Dans le cas de matériaux avec une courbe contrainte-déformation en dents de scie dans le domaine de consolidation (matériaux qui présentent l'effet Portevin-Le Chatelier, par exemple les alliages AlMg), on utilise la détermination automatique (régression linéaire du logarithme de la contrainte vraie en fonction du logarithme de la déformation plastique vraie, voir 8.7) pour obtenir des résultats reproductibles.

Kovinski materiali - Pločevina in trakovi - Ugotavljanje koeficienta utrjevanja (ISO 10275:2020)

General Information

• Status: Published
• Public Enquiry End Date: 23-Jul-2020
• Publication Date: 09-Nov-2020
• ICS: 77.040.10 - Mechanical testing of metals
• ICS: 77.140.50 - Flat steel products and semi-products
• Technical Committee: PKG - Testing of metallic materials
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 17-Sep-2020
• Due Date: 22-Nov-2020
• Completion Date: 10-Nov-2020
• Ref Project: EN ISO 10275:2020 - Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (ISO 10275:2020)

Relations

• Replaces: SIST EN ISO 10275:2014 - Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (ISO 10275:2007)
• Effective Date: 16-Sep-2020

Overview

EN ISO 10275:2020 - Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent specifies a standardized method to determine the tensile strain hardening exponent (n) for flat products (sheet and strip) made from metallic materials. The standard defines the test principle, equipment and specimen requirements, data evaluation (including the σ = C·ε^n relationship and its logarithmic form), and reporting rules. It applies only to the portion of the stress–strain curve in the plastic range that is continuous and monotonic; for serrated curves (Portevin–Le Chatelier effect) the standard prescribes automatic linear regression of log(true stress) vs log(true plastic strain) to ensure reproducible n-values.

Key topics and requirements

• Scope: Determination of tensile strain hardening exponent for sheet and strip metallic products.
• Definition: n is the exponent in σ = C·ε^n (true stress vs true plastic strain); in log form n is the slope of ln(σ) vs ln(εp).
• Test equipment:
  • Tensile testing machine verified to ISO 7500‑1, class 1 or better.
  • Extensometer per ISO 9513, class 2 or better (class 1 when measuring plastic strain ratio r).
  • Accurate dimensional measurement tools for thickness/width.
• Specimen and sampling: Specimen thickness equals full sheet thickness unless agreed otherwise; machining and dimensions per ISO 6892‑1.
• Procedure constraints:
  • Ambient test temperature 10 °C to 35 °C (controlled tests at 23 ± 5 °C where required).
  • Plastic strain rate of parallel length not to exceed 0.008 s‑1 (kept constant while determining n).
  • When determining over the whole uniform plastic range, upper limit is immediately before maximum force.
• Data evaluation: Single-point method or linear regression over a specified plastic strain range; automatic regression recommended for materials showing serrated work hardening.
• Edition updates: This 2020 edition requires subtraction of elastic strain to compute true plastic strain (change from previous editions).

Applications

• Material characterization for sheet metal forming, drawing and stamping processes.
• Input data for constitutive models and finite element simulations (work hardening behavior).
• Supplier qualification, quality control and R&D for aluminium, steel and other metallic sheet/strip products.
• Process engineers, metallurgists, test laboratories and standards/quality managers use this standard to obtain reproducible, comparable n-values.

Related standards

• ISO 6892‑1 - Tensile testing at room temperature
• ISO 7500‑1 - Calibration of testing machines (force measurement)
• ISO 9513 - Calibration of extensometer systems
• ISO 10113 - Determination of plastic strain ratio (r)

Keywords: EN ISO 10275:2020, tensile strain hardening exponent, sheet and strip, metallic materials, tensile test, true stress, true plastic strain, Portevin–Le Chatelier, linear regression.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2020
Nadomešča:
SIST EN ISO 10275:2014
Kovinski materiali - Pločevina in trakovi - Ugotavljanje koeficienta utrjevanja (ISO
10275:2020)
Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent
(ISO 10275:2020)
Metallische Werkstoffe - Blech und Band - Bestimmung des Verfestigungsexponenten im
Zugversuch (ISO 10275:2020)
Matériaux métalliques - Tôles et bandes - Détermination du coefficient d'écrouissage en
traction (ISO 10275:2020)
Ta slovenski standard je istoveten z: EN ISO 10275:2020
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
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.

EN ISO 10275
EUROPEAN STANDARD
NORME EUROPÉENNE
September 2020
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 10275:2014
English Version
Metallic materials - Sheet and strip - Determination of
tensile strain hardening exponent (ISO 10275:2020)
Matériaux métalliques - Tôles et bandes - Metallische Werkstoffe - Blech und Band - Bestimmung
Détermination du coefficient d'écrouissage en traction des Verfestigungsexponenten im Zugversuch (ISO
(ISO 10275:2020) 10275:2020)
This European Standard was approved by CEN on 28 August 2020.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which 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 CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

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, Turkey 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
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10275:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 10275:2020) has been prepared by Technical Committee ISO/TC 164
"Mechanical testing of metals" in collaboration with Technical Committee CEN/TC 459/SC 1 “Test
methods for steel (other than chemical analysis)” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by March 2021, and conflicting national standards shall
be withdrawn at the latest by March 2021.
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.
This document supersedes EN ISO 10275:2014.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: 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, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 10275:2020 has been approved by CEN as EN ISO 10275:2020 without any modification.

INTERNATIONAL ISO
STANDARD 10275
Third edition
2020-08
Metallic materials — Sheet and strip
— Determination of tensile strain
hardening exponent
Matériaux métalliques — Tôles et bandes — Détermination du
coefficient d'écrouissage en traction
Reference number
ISO 10275:2020(E)
©
ISO 2020
ISO 10275:2020(E)
© ISO 2020
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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CH-1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2020 – All rights reserved

ISO 10275:2020(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and designations . 2
5 Principle . 3
6 Test equipment. 3
7 Test pieces . 3
8 Procedure. 3
9 Test report . 7
Annex A (informative) International comparison of symbols used in the determination
of the tensile strain hardening exponent . 9
Bibliography .10
ISO 10275:2020(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
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For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals,
Subcommittee SC 2, Ductility testing, in collaboration with the European Committee for Standardization
(CEN) Technical Committee CEN/TC 459, ECISS – European Committee for Iron and Steel Standardization,
in accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 10275:2007), of which it constitutes a
minor revision.
The main changes compared to the previous edition are as follows:
— Clause 2 has been updated;
— new Clause 3 "Terms and definitions" has been added as per the latest Directives, Part 2;
— the symbol for true plastic strain has been changed from ε to ε ;
p
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2020 – All rights reserved

ISO 10275:2020(E)
Introduction
In the previous edition of this document, for the calculation of the true strain, the elastic strain did not
need to be subtracted from the total strain if it was lower than 10 % of the total strain.
In this document, the elastic strain is subtracted from the total strain for calculation of the true strain,
which is now referred to as “true plastic strain”.
INTERNATIONAL STANDARD ISO 10275:2020(E)
Metallic materials — Sheet and strip — Determination of
tensile strain hardening exponent
1 Scope
This document specifies a method for determining the tensile strain hardening exponent n of flat
products (sheet and strip) made of metallic materials.
The method is valid only for that par
...