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SLOVENSKI STANDARD
01-november-2022
Nadomešča:
SIST EN ISO 16808:2014
Kovinski materiali - Pločevina in trak - Ugotavljanje krivulje dvoosnega diagrama z
izboklinskim preskusom optičnih merilnih sistemov (ISO 16808:2022)
Metallic materials - Sheet and strip - Determination of biaxial stress-strain curve by
means of bulge test with optical measuring systems (ISO 16808:2022)
Metallische Werkstoffe - Blech und Band - Bestimmung der biaxialen
Spannung/Dehnung-Kurve durch einen hydraulischen Tiefungsversuch mit optischen
Messsystemen (ISO 16808:2022)
Matériaux métalliques - Tôles et bandes - Détermination de la courbe contrainte-
déformation biaxiale au moyen de l'essai de gonflement hydraulique avec systèmes de
mesure optiques (ISO 16808:2022)
Ta slovenski standard je istoveten z: EN ISO 16808:2022
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 16808
EUROPEAN STANDARD
NORME EUROPÉENNE
May 2022
EUROPÄISCHE NORM
ICS 77.040.10 Supersedes EN ISO 16808:2014
English Version
Metallic materials - Sheet and strip - Determination of
biaxial stress-strain curve by means of bulge test with
optical measuring systems (ISO 16808:2022)
Matériaux métalliques - Tôles et bandes - Metallische Werkstoffe - Blech und Band - Bestimmung
Détermination de la courbe contrainte-déformation der biaxialen Spannung/Dehnung-Kurve durch einen
biaxiale au moyen de l'essai de gonflement hydraulique hydraulischen Tiefungsversuch mit optischen
avec systèmes de mesure optiques (ISO 16808:2022) Messsystemen (ISO 16808:2022)
This European Standard was approved by CEN on 18 April 2022.
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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 16808:2022 E
worldwide for CEN national Members.
Contents Page
European foreword . 3
European foreword
This document (EN ISO 16808:2022) 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 November 2022, and conflicting national standards
shall be withdrawn at the latest by November 2022.
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 16808:2014.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. A complete listing of these bodies can be found on the CEN website.
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 16808:2022 has been approved by CEN as EN ISO 16808:2022 without any modification.
INTERNATIONAL ISO
STANDARD 16808
Second edition
2022-05
Metallic materials — Sheet and strip
— Determination of biaxial stress-
strain curve by means of bulge test
with optical measuring systems
Matériaux métalliques — Tôles et bandes — Détermination de
la courbe contrainte-déformation biaxiale au moyen de l'essai de
gonflement hydraulique avec systèmes de mesure optiques
Reference number
ISO 16808:2022(E)
ISO 16808:2022(E)
© ISO 2022
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
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Email: [email protected]
Website: www.iso.org
Published in Switzerland
ii
ISO 16808:2022(E)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms.1
5 Principle . 2
6 Test equipment .3
7 Optical measurement system. 5
8 Test piece . 6
8.1 General . 6
8.2 Application of grid . 6
8.2.1 Type of grid . 6
8.2.2 Grid application . 6
9 Procedure .6
10 Evaluation methods for the determination of the curvature and strains at the pole.7
11 Calculation of biaxial stress-strain curves . 8
12 Test report . 9
Annex A (informative) Test procedure for a quality check of the optical measurement
system.11
Annex B (informative) Computation of the curvature on the basis of a response surface .14
Annex C (informative) Determination of the equi-biaxial stress point of the yield locus and
the hardening curve .16
Bibliography .24
iii
ISO 16808:2022(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
constitute an endorsement.
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/SC 1, Test methods for steel (other than chemical analysis), in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This second edition cancels and replaces the first edition (ISO 16808:2014), of which it constitutes a
minor revision. The changes are as follows:
— the designation of r in Table 1 has been modified;
1_100
— the title of Figure A.4 has been modified;
— Formula (B.2) has been modified;
— Annex A has been deleted and other annexes have been renumbered accordingly;
— the status of Annex A (formerly Annex B) has been changed to informative;
— minor editorial changes have been made to align with ISO/IEC Directives Part 2, 2021.
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
INTERNATIONAL STANDARD ISO 16808:2022(E)
Metallic materials — Sheet and strip — Determination
of biaxial stress-strain curve by means of bulge test with
optical measuring systems
1 Scope
This document specifies a method for determination of the biaxial stress-strain curve of metallic
sheets having a thickness below 3 mm in pure stret
...