EN ISO 12004-2:2021

Metallic materials - Determination of forming-limit curves for sheet and strip - Part 2: Determination of forming-limit curves in the laboratory (ISO 12004-2:2021)

This document specifies testing conditions for use when constructing a forming-limit curve (FLC) at ambient temperature and using linear strain paths. The material considered is flat, metallic and of thickness between 0,3 mm and 4 mm.
NOTE The limitation in thickness of up to 4 mm is proposed, giving a maximum allowable thickness to the punch diameter ratio.

Metallische Werkstoffe - Bestimmung der Grenzformänderungskurve für Bleche und Bänder - Teil 2: Bestimmung von Grenzformänderungskurven im Labor (ISO 12004-2:2021)

Dieses Dokument legt Prüfbedingungen für die Verwendung bei der Erstellung einer für den betreffenden Werkstoff bei Umgebungstemperatur geltenden Grenzformänderungskurve (FLC) unter Verwendung von linearen Formänderungsverläufen fest. Der betrachtete Werkstoff ist eben, metallisch und hat eine Dicke von 0,3 mm bis 4 mm.
ANMERKUNG Die Begrenzung der Dicke auf bis zu 4 mm wird vorgeschlagen, wodurch sich ein maximal zulässiges Verhältnis von Dicke zu Stempeldurchmesser ergibt.

Matériaux métalliques - Détermination des courbes limites de formage pour les tôles et bandes - Partie 2: Détermination des courbes limites de formage en laboratoire (ISO 12004-2:2021)

Le présent document spécifie des conditions d'essai à utiliser pour la construction d'une courbe limite de formage (CLF) à la température ambiante et au moyen de chemins linéaires de déformation. Le matériau considéré est plat, métallique et d'épaisseur comprise entre 0,3 mm et 4 mm.
NOTE       La limitation en épaisseur à 4 mm est proposée, donnant un rapport maximal admissible épaisseur/diamètre du poinçon.

Kovinski materiali - Določevanje krivulj preoblikovalnosti za pločevino in trakove - 2. del: Določevanje krivulj preoblikovalnosti v laboratoriju (ISO 12004-2:2021)

General Information

• Status: Published
• Publication Date: 02-Mar-2021
• Withdrawal Date: 29-Sep-2021
• ICS: 77.040.10 - Mechanical testing of metals
• Technical Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Drafting Committee: ECISS/TC 101 - Test methods for steel (other than chemical analysis)
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 03-Mar-2021
• Completion Date: 03-Mar-2021
• Ref Project: SIST EN ISO 12004-2:2021 - Metallic materials - Determination of forming-limit curves for sheet and strip - Part 2: Determination of forming-limit curves in the laboratory (ISO 12004-2:2021)

Relations

• Replaces: EN ISO 12004-2:2008 - Metallic materials - Sheet and strip - Determination of forming-limit curves - Part 2: Determination of forming-limit curves in the laboratory (ISO 12004-2:2008)
• Effective Date: 03-Apr-2019

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2021
Nadomešča:
SIST EN ISO 12004-2:2009
Kovinski materiali - Določevanje krivulj preoblikovalnosti za pločevino in trakove -
2. del: Določevanje krivulj preoblikovalnosti v laboratoriju (ISO 12004-2:2021)
Metallic materials - Determination of forming-limit curves for sheet and strip - Part 2:
Determination of forming-limit curves in the laboratory (ISO 12004-2:2021)
Metallische Werkstoffe - Bestimmung der Grenzformänderungskurve für Bleche und
Bänder - Teil 2: Bestimmung von Grenzformänderungskurven im Labor (ISO 12004
2:2021)
Matériaux métalliques - Détermination des courbes limites de formage pour les tôles et
bandes - Partie 2: Détermination des courbes limites de formage en laboratoire (ISO
12004-2:2021)
Ta slovenski standard je istoveten z: EN ISO 12004-2:2021
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 12004-2
EUROPEAN STANDARD
NORME EUROPÉENNE
March 2021
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 12004-2:2008
English Version
Metallic materials - Determination of forming-limit curves
for sheet and strip - Part 2: Determination of forming-limit
curves in the laboratory (ISO 12004-2:2021)
Matériaux métalliques - Détermination des courbes Metallische Werkstoffe - Bestimmung der
limites de formage pour les tôles et bandes - Partie 2: Grenzformänderungskurve für Bleche und Bänder -
Détermination des courbes limites de formage en Teil 2: Bestimmung von Grenzformänderungskurven
laboratoire (ISO 12004-2:2021) im Labor (ISO 12004 2:2021)
This European Standard was approved by CEN on 15 January 2021.

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
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12004-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 12004-2:2021) 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 September 2021, and conflicting national standards
shall be withdrawn at the latest by September 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 12004-2:2008.
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 12004-2:2021 has been approved by CEN as EN ISO 12004-2:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 12004-2
Second edition
2021-02
Metallic materials — Determination
of forming-limit curves for sheet and
strip —
Part 2:
Determination of forming-limit curves
in the laboratory
Matériaux métalliques — Détermination des courbes limites de
formage pour les tôles et bandes —
Partie 2: Détermination des courbes limites de formage en laboratoire
Reference number
ISO 12004-2:2021(E)
©
ISO 2021
ISO 12004-2:2021(E)
© ISO 2021
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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Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

ISO 12004-2:2021(E)
Contents Page
Foreword .iv
Introduction .vi
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols . 1
5 Principle . 2
6 Test pieces and equipment . 3
6.1 Test pieces . 3
6.1.1 Thickness of test pieces . 3
6.1.2 Test piece geometry . 3
6.1.3 Test piece preparation in test area . 4
6.1.4 Number of different test piece geometries . 4
6.1.5 Number of tests for each geometry . 4
6.2 Application of grid . 4
6.2.1 Type of grid . 4
6.2.2 Grid application . 5
6.2.3 Accuracy of the undeformed grid . 5
6.3 Test equipment . 5
6.3.1 General. 5
6.3.2 Strain determination . 7
6.3.3 Nakajima test . 7
6.3.4 Marciniak test . 9
7 Analysis of strain profile and measurement of ε – ε pairs .11
1 2
7.1 General .11
7.2 Evaluation using section lines (position-dependent measurement) .11
7.2.1 General.11
7.2.2 Position and processing of measurements .12
7.2.3 Extraction of the “bell-shaped curve” and determination of the inner
limits for the best-fit curve through experimental points .13
7.2.4 Definition of outer limits for best-fit windows and evaluation of the
inverse best-fit parabola on the “bell-shaped curve” .14
8 Documentation .15
9 Test report .16
Annex A (normative) Second derivative and “filtered” second derivative .17
Annex B (normative) Calculation of the width of the fit window.18
Annex C (normative) Evaluation of the inverse best-fit parabola on the “bell-shaped curve” .19
Annex D (normative) Application/Measurement of grid —
Evaluation with magnifying glass or microscope .21
Annex E (informative) Tables of experimental data for validation of calculation programme .22
Annex F (normative) Representation and mathematical description of FLC .23
Annex G (informative) Examples of critical section line data .24
Annex H (normative) Flowchart from measured strain distributions to FLC values .25
Bibliography .27
ISO 12004-2:2021(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 I
...