EN ISO 12004-2:2008
(Main)Metallic materials - Sheet and strip - Determination of forming-limit curves - Part 2: Determination of forming-limit curves in the laboratory (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)
ISO 12004-2:2008 specifies the testing conditions to be used 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.
Metallische Werkstoffe - Bleche und Bänder - Bestimmung der Grenzformänderungskurve - Teil 2: Bestimmung von Grenzformänderungskurven im Labor (ISO 12004-2:2008)
Dieser Teil von ISO 12004 legt Prüfbedingungen fest, die bei der Erstellung einer für den betreffenden Werkstoff bei Umgebungstemperatur geltenden Grenzformänderungskurve (FLC) mit Hilfe von linearen Form-ände¬rungsverläufen anzuwenden sind. Das Prüfmaterial ist eben, metallisch und von einer Dicke zwischen 0,3 mm und 4 mm.
ANMERKUNG Die Begrenzung der Dicke auf bis zu 4 mm wird vorgeschlagen, um das zulässige Verhältnis Dicke/
Stempeldurchmesser maximal werden zu lassen. Für größere Dicken liegen nicht genügend Erfahrungen vor, und daher kann die Zuverlässigkeit der entsprechenden Grenzdehnungen nicht garantiert werden.
Für Stahlbleche wird eine Maximaldicke von 2,5 mm empfohlen.
Matériaux métalliques - Tôles et bandes - Détermination des courbes limites de formage - Partie 2: Détermination des courbes limites de formage en laboratoire (ISO 12004-2:2008)
L'ISO 12004-2:2008 spécifie les 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.
Kovinski materiali - Pločevina in trakovi - Določevanje krivulj preoblikovalnosti - 2. del: Določevanje krivulj preoblikovalnosti v laboratoriju (ISO 12004-2:2008)
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-april-2009
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GHO 'RORþHYDQMHNULYXOMSUHREOLNRYDOQRVWLYODERUDWRULMX ,62
Metallic materials - Sheet and strip - Determination of forming-limit curves - Part 2:
Determination of forming-limit curves in the laboratory (ISO 12004-2:2008)
Metallische Werkstoffe - Bleche und Bänder - Bestimmung der
Grenzformänderungskurve - Teil 2: Bestimmung von Grenzformänderungskurven im
Labor (ISO 12004-2:2008)
Matériaux métalliques - Tôles et bandes - Détermination des courbes limites de formage
- Partie 2: Determination des courbes limites de formage en laboratoire (ISO 12004-
2:2008)
Ta slovenski standard je istoveten z: EN ISO 12004-2:2008
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 12004-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 77.040.10
English Version
Metallic materials - Sheet and strip - Determination of forming-
limit curves - Part 2: Determination of forming-limit curves in the
laboratory (ISO 12004-2:2008)
Matériaux métalliques - Tôles et bandes - Détermination Metallische Werkstoffe - Bleche und Bänder - Bestimmung
des courbes limites de formage - Partie 2: Détermination der Grenzformänderungskurve - Teil 2: Bestimmung von
des courbes limites de formage en laboratoire (ISO 12004- Grenzformänderungskurven im Labor (ISO 12004-2:2008)
2:2008)
This European Standard was approved by CEN on 12 October 2008.
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 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
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CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
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Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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EUROPÄISCHES KOMITEE FÜR NORMUNG
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© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12004-2:2008: E
worldwide for CEN national Members.
Contents Page
Foreword.3
Foreword
This document (EN ISO 12004-2:2008) has been prepared by Technical Committee ISO/TC 164 "Mechanical
testing of metals" in collaboration with Technical Committee ECISS/TC 1 “Steel - Mechanical testing” 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 April 2009, and conflicting national standards shall be withdrawn at the
latest by April 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
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, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 12004-2:2008 has been approved by CEN as a EN ISO 12004-2:2008 without any
modification.
INTERNATIONAL ISO
STANDARD 12004-2
First edition
2008-10-15
Metallic materials — Sheet and strip —
Determination of forming-limit curves —
Part 2:
Determination of forming-limit curves in
the laboratory
Matériaux métalliques — Tôles et bandes — Détermination des courbes
limites de formage —
Partie 2: Détermination des courbes limites de formage en laboratoire
Reference number
ISO 12004-2:2008(E)
©
ISO 2008
ISO 12004-2:2008(E)
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ii © ISO 2008 – All rights reserved
ISO 12004-2:2008(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Symbols and abbreviated terms . 1
3 Principle. 2
4 Test pieces and equipment. 3
5 Analysis of strain profile and measurement of ε - ε pairs . 10
1 2
6 Documentation. 15
7 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 cross-sectional data . 24
Annex H (normative) Flowchart from measured strain distributions to FLC values . 25
Bibliography . 27
ISO 12004-2:2008(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 12004-2 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 2, Ductility testing.
This first edition of ISO 12004-2, together with ISO 12004-1, cancels and replaces ISO 12004:1997 which has
been technically revised.
ISO 12004 consists of the following parts, under the general title Metallic materials — Sheet and strip —
Determination of forming-limit curves:
⎯ Part 1: Measurement and application of forming-limit diagrams in the press shop
⎯ Part 2: Determination of forming-limit curves in the laboratory
iv © ISO 2008 – All rights reserved
ISO 12004-2:2008(E)
Introduction
A forming-limit diagram (FLD) is a diagram containing major/minor strain points.
An FLD can distinguish between safe points and necked or failed points. The transition from safe to failed
points is defined by the forming-limit curve (FLC).
To determine the forming limit of materials, two different methods are possible.
1) Strain analysis on failed press shop components to determine component and process dependent
FLCs:
In the press shop, the strain paths followed to reach these points are generally not known. Such an
FLC depends on the material, the component and the chosen forming conditions. This method is
described in ISO 12004-1.
2) Determination of FLCs under well-defined laboratory conditions:
For evaluating formability, one unique FLC for each material in several strain states is necessary.
The determination of the FLC has to be specific and it is necessary to use different linear strain paths.
This method should be used for material characterization as described in ISO 12004-2.
For this part of ISO 12004 (concerning determination of forming-limit curves in laboratory), the following
conditions are also valid.
⎯ Forming-limit curves (FLCs) are determined for specific materials to define the extent to which they can
be deformed by drawing, stretching or any combination of drawing and stretching. This capability is
limited by the occurrence of fracture, localized necking. Many methods exist to determine the forming limit
of a material; however, it should be noted that results obtained using different methods cannot be used
for comparison purposes.
⎯ The FLC characterizes the deformation limit of a material in the condition after a defined thermo-
mechanical treatment and in the analysed thickness. For a judgement of formability, the additional
knowledge of mechanical properties and the material’s history prior to the FLC-test are important.
To compare the formability of different materials, it is important not only to judge the FLC but also the following
parameters:
a) mechanical properties at least in the main direction;
b) percentage plastic extension at maximum force, according to ISO 6892-1;
c) r-value with given deformation range, according to ISO 10113;
d) n-value with given deformation range, according to ISO 10275.
INTERNATIONAL STANDARD ISO 12004-2:2008(E)
Metallic materials — Sheet and strip — Determination of
forming-limit curves —
Part 2:
Determination of forming-limit curves in the laboratory
1 Scope
This part of ISO 12004 specifies the testing conditions to be used 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
...
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