EN ISO 10275:2014
(Main)Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (ISO 10275:2007)
Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent (ISO 10275:2007)
ISO 10275:2007 specifies a method for determining the tensile strain hardening exponent 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.
Metallische Werkstoffe - Blech und Band - Bestimmung des Verfestigungsexponenten im Zugversuch (ISO 10275:2007)
Diese Internationale Norm 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 7.4).
Bei Werkstoffen mit gezackter Spannung/Dehnung-Kurve im Verfestigungsbereich (Werkstoffe mit Portevin-Le Chatelier Effekt, z. B. AlMg-Legierungen) sollte die automatisierte Bestimmung (lineare Regression der logarithmierten wahren Spannung über die logarithmierte wahre plastische Dehnung, siehe 7.7) angewendet werden, um reproduzierbare Ergebnisse zu erhalten.
Matériaux métalliques - Tôles et bandes - Détermination du coefficient d'écrouissage en traction (ISO 10275:2007)
L'ISO 10275:2007 spécifie une méthode pour la détermination du coefficient d'écrouissage en traction 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.
Kovinski materiali - Pločevina in trakovi - Ugotavljanje koeficienta utrjanja (ISO 10275:2007)
Standard EN ISO 10275 določa metodo za ugotavljanje koeficienta utrjanja ploščatih izdelkov (pločevine in trakov), izdelanih iz kovinskih materialov. Postopek velja le za del krivulje stres-utrjanje v območju plastike, kjer je krivulja neprekinjena in enakomerna (glej 7.4). Pri materialih z nazobčanim krivuljo stresa-utrjanja v območju delovnega utrjanja (materiali, ki kažejo na Portevin-Le Chatelierjev učinek, npr. zlitine Al-Mg) naj bi za ponovljive rezultate uporabili samodejno določanje (linearna regresija logaritma pravega stresa v primerjavi z logaritmom plastične anizotropije, glej 7.7).
General Information
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Standards Content (Sample)
SLOVENSKI STANDARD
01-september-2014
.RYLQVNLPDWHULDOL3ORþHYLQDLQWUDNRYL8JRWDYOMDQMHNRHILFLHQWDXWUMDQMD ,62
Metallic materials - Sheet and strip - Determination of tensile strain hardening exponent
(ISO 10275:2007)
Metallische Werkstoffe - Blech und Band - Bestimmung des Verfestigungsexponenten im
Zugversuch (ISO 10275:2007)
Matériaux métalliques - Tôles et bandes - Détermination du coefficient d'écrouissage en
traction (ISO 10275:2007)
Ta slovenski standard je istoveten z: EN ISO 10275:2014
ICS:
77.040.10 Mehansko preskušanje kovin Mechanical testing of metals
77.140.50 3ORãþDWLMHNOHQLL]GHONLLQ Flat steel products and semi-
SROL]GHONL products
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
EUROPEAN STANDARD
EN ISO 10275
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2014
ICS 77.040.10
English Version
Metallic materials - Sheet and strip - Determination of tensile
strain hardening exponent (ISO 10275:2007)
Matériaux métalliques - Tôles et bandes - Détermination du Metallische Werkstoffe - Blech und Band - Bestimmung des
coefficient d'écrouissage en traction (ISO 10275:2007) Verfestigungsexponenten im Zugversuch (ISO 10275:2007)
This European Standard was approved by CEN on 6 June 2014.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, 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: Avenue Marnix 17, B-1000 Brussels
© 2014 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 10275:2014 E
worldwide for CEN national Members.
Contents Page
Foreword .3
Foreword
The text of ISO 10275:2007 has been prepared by Technical Committee ISO/TC 164 “Mechanical testing of
metals” of the International Organization for Standardization (ISO) and has been taken over as EN
ISO 10275:2014 by Technical Committee ECISS/TC 101 “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 December 2014, and conflicting national standards shall be withdrawn
at the latest by December 2014.
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, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.
Endorsement notice
The text of ISO 10275:2007 has been approved by CEN as EN ISO 10275:2014 without any modification.
INTERNATIONAL ISO
STANDARD 10275
Second edition
2007-06-01
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 10275:2007(E)
©
ISO 2007
ISO 10275:2007(E)
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ii © ISO 2007 – All rights reserved
ISO 10275:2007(E)
Contents Page
Foreword. iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Symbols and designations . 1
4 Principle. 3
5 Test equipment . 3
6 Test pieces . 3
7 Procedure . 3
8 Test report . 8
Annex A (informative) International comparison of symbols used in the determination
of the tensile strain hardening exponent . 9
Bibliography . 10
ISO 10275:2007(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 10275 was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 2, Ductility testing.
This second edition cancels and replaces the first edition (ISO 10275:1993), which has been technically
revised.
iv © ISO 2007 – All rights reserved
ISO 10275:2007(E)
Introduction
In the former version of this International Standard, 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 new International Standard, 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 10275:2007(E)
Metallic materials — Sheet and strip — Determination of tensile
strain hardening exponent
1 Scope
This International Standard 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 7.4).
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 7.7) should be used to give reproducible results.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 6892:1998, Metallic materials — Tensile testing at ambient temperature
ISO 7500-1:2004, Metallic materials — Verification of static uniaxial testing machines — Part 1:
Tension/compression testing machines — Verification and calibration of the force-measuring system
ISO 9513:1999, Metallic materials — Calibration of extensometers used in uniaxial testing
ISO 10113, Metallic materials — Sheet and strip — Determination of plastic strain ratio
3 Symbols and designations
The symbols and corresponding designations used in determining the tensile strain hardening exponent are
given in Table 1.
ISO 10275:2007(E)
Table 1 — Symbols and designations
Symbol Designation Units
L Extensometer gauge length (L) mm
e e
∆L Instantaneous extension of the measurement base mm
L Instantaneous length of the extensometer gauge length L = L + ∆L mm
e
Specified plastic (engineering) strain at which the tensile strain hardening
e %
p
exponent should be determined (single data point method)
Specified plastic (engineering) strain range at which the tensile strain
hardening exponent should be determined (linear regression method, e =
pα
e − e %
pα pβ
lower limit of the plastic strain in percent, e = upper limit of the plastic
pβ
strain in percent)
S Original cross-sectional area of the parallel length mm
o
S True cross-sectional area mm
F Instantaneous force applied to the test piece N
R Stress MPa
σ True stress MPa
ε True plastic strain —
m Slope of the elastic part of the stress/percentage extension-curve MPa
E
n Tensile strain hardening exponent —
C Strength coefficient MPa
Number of measurements made in determining the tensile strain hardening
N —
exponent
r Plastic strain ratio —
R Tensile strength MPa
m
A Percentage yield point extension %
e
A Percentage plastic extension at maximum force %
g
A, B, x, y Variables used for the evaluation of n by the manual method
NOTE 1 In the literature the readers may encounter other symbols. For an international comparison of symbols, see Annex A.
NOTE 2 1 MPa = 1 N/mm .
3.2 The tensile strain hardening exponent n is defined as the exponent of the true plastic strain in the
mathematical equation relating the true stress to the true plastic strain (during uniaxial application of a force).
This equation can be taken as follows:
n
σ=×C ε (1)
3.3 This equation can be transformed into a logarithmic one as follows:
lnσ=+lnCnlnε (2)
...
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