prEN ISO 26203-1
(Main)Metallic materials - Tensile testing at high strain rates - Part 1: Elastic-bar-type systems (ISO/DIS 26203-1:2024)
Metallic materials - Tensile testing at high strain rates - Part 1: Elastic-bar-type systems (ISO/DIS 26203-1:2024)
ISO 26203-1:2018 specifies methods for testing metallic sheet materials to determine the stress-strain characteristics at high strain rates. This document covers the use of elastic-bar-type systems.
The strain-rate range between 10−3 and 103 s−1 is considered to be the most relevant to vehicle crash events based on experimental and numerical calculations such as the finite element analysis (FEA) work for crashworthiness.
In order to evaluate the crashworthiness of a vehicle with accuracy, reliable stress-strain characterization of metallic materials at strain rates higher than 10−3 s−1 is essential.
This test method covers the strain-rate range above 102 s−1.
NOTE 1 At strain rates lower than 10−1 s−1, a quasi-static tensile testing machine that is specified in ISO 7500‑1 and ISO 6892‑1 can be applied.
NOTE 2 This testing method is also applicable to tensile test-piece geometries other than the flat test pieces considered here.
Metallische Werkstoffe - Zugversuch bei hohen Dehngeschwindigkeiten - Teil 1: Elastische Stoßwellentechnik (ISO/DIS 26203-1:2024)
Matériaux métalliques - Essai de traction à vitesses de déformation élevées - Partie 1: Systèmes de type à barre élastique (ISO/DIS 26203-1:2024)
ISO 26203-1:2018 spécifie des méthodes pour les essais des tôles de matériaux métalliques en vue de déterminer les caractéristiques contrainte-déformation à vitesses de déformation élevées. Ce document couvre l'utilisation des systèmes d'essai de type à barre élastique.
La gamme de vitesses de déformation entre 10−3 s−1 et 103 s−1 est considérée être la plus pertinente pour les accidents de véhicule sur la base de calculs expérimentaux et numériques tels que le travail d'analyse par éléments finis (AEF) pour le comportement en cas d'accident.
De façon à évaluer le comportement des véhicules en cas d'accident avec précision, une caractérisation fiable des caractéristiques contrainte-déformation des matériaux métalliques à des vitesses de déformation supérieures à 10−3 s−1 est essentielle.
La présente méthode d'essai couvre la gamme de vitesses de déformation au-dessus de 102 s−1.
NOTE 1 À des vitesses de déformation inférieures à 10−1 s−1, une machine d'essai de traction quasi-statique, spécifiée dans l'ISO 7500‑1 et l'ISO 6892‑1 peut être utilisée.
NOTE 2 Cette méthode d'essai est également applicable aux géométries d'éprouvettes de traction autres que les éprouvettes plates considérées ici.
Kovinski materiali - Natezni preskus pri velikih hitrostih deformacije - 1. del: Sistem z elastičnim drogom (ISO/DIS 26203-1:2024)
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Standards Content (Sample)
SLOVENSKI STANDARD
01-oktober-2024
Kovinski materiali - Natezni preskus pri velikih hitrostih deformacije - 1. del:
Sistem z elastičnim drogom (ISO/DIS 26203-1:2024)
Metallic materials - Tensile testing at high strain rates - Part 1: Elastic-bar-type systems
(ISO/DIS 26203-1:2024)
Metallische Werkstoffe - Zugversuch bei hohen Dehngeschwindigkeiten - Teil 1:
Elastische Stoßwellentechnik (ISO/DIS 26203-1:2024)
Matériaux métalliques - Essai de traction à vitesses de déformation élevées - Partie 1:
Systèmes de type à barre élastique (ISO/DIS 26203-1:2024)
Ta slovenski standard je istoveten z: prEN ISO 26203-1
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.
DRAFT
International
Standard
ISO/DIS 26203-1
ISO/TC 164/SC 1
Metallic materials — Tensile testing
Secretariat: AFNOR
at high strain rates —
Voting begins on:
Part 1: 2024-08-20
Elastic-bar-type systems
Voting terminates on:
2024-11-12
Matériaux métalliques — Essai de traction à vitesses de
déformation élevées —
Partie 1: Systèmes de type à barre élastique
ICS: ISO ics
THIS DOCUMENT IS A DRAFT CIRCULATED
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IS THEREFORE SUBJECT TO CHANGE
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This document is circulated as received from the committee secretariat.
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Reference number
ISO/DIS 26203-1:2024(en)
DRAFT
ISO/DIS 26203-1:2024(en)
International
Standard
ISO/DIS 26203-1
ISO/TC 164/SC 1
Metallic materials — Tensile testing
Secretariat: AFNOR
at high strain rates —
Voting begins on:
Part 1:
Elastic-bar-type systems
Voting terminates on:
Matériaux métalliques — Essai de traction à vitesses de
déformation élevées —
Partie 1: Systèmes de type à barre élastique
ICS: ISO ics
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document is circulated as received from the committee secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
© ISO 2024
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland Reference number
ISO/DIS 26203-1:2024(en)
ii
ISO/DIS 26203-1:2024(en)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and designations . 1
5 Principles . 3
6 Apparatus . 3
7 Test piece . 5
7.1 Test-piece shape, size and preparation .5
7.2 Typical test piece .7
8 Calibration of the apparatus . 8
8.1 General .8
8.2 Displacement measuring device .9
9 Procedure . 9
9.1 General .9
9.2 Mounting the test piece .9
9.3 Applying force .9
9.4 Measuring and recording .9
10 Evaluation of the test result .11
11 Test report .12
Annex A (informative) Quasi-static tensile testing method . 14
Annex B (informative) Example of one-bar method .16
Annex C (informative) Example of split Hopkinson bar (SHB) method .23
Bibliography .30
iii
ISO/DIS 26203-1:2024(en)
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
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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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
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www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
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This document was prepared by Technical Committee ISO/TC 164, Mechanical testing of metals, Subcommittee
SC 1, Uniaxial testing.
This third edition cancels and replaces the second edition (ISO 26203-1:2018), which has been technically
revised.
The main changes are as follows:
— Modification of sentence regarding Annex A in Clause 5
— Modification of NOTE in subclause 7.1
— Modification of Annex A (see A.6)
A list of all parts in the ISO 26203 series can be found on the ISO website.
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/DIS 26203-1:2024(en)
Introduction
Tensile testing of metallic sheet materials at high strain rates is important to achieve a reliable analysis of
vehicle crashworthiness. During a crash event, the maximum strain rate often reaches 103 s−1, at which
the strength of the material can be significantly higher than that under quasi-static loading conditions.
Thus, the reliability of crash simulation depends on the accuracy of the input data specifying the strain-rate
sensitivity of the materials.
Although there are several methods for high-strain rate testing, solutions for three significant problems are
required.
The first problem is the noise in the force measurement signal.
— The test force is generally detected at a measurement point on the force measurement device that is
located some distance away from the test piece.
— Furthermore, the elastic wave which has already passed the measurement point returns there by
reflection at the end of the force measurement device. If the testing time is comparable to the time
for wave propagation through the force measurement device, the stress-strain curve may have large
oscillations as a result of the superposition of the direct and indirect waves. In quasi-static testing,
contrarily, the testing time is sufficiently long to have multiple round-trips of the elastic wave. Thus, the
force reaches a saturated state and equilibrates at any point of the force measurement device.
— There are two opposing solutions for this problem.
— The first solution is to use a short force measurement device which will reach the saturated state quickly.
This approach is often adopted in the servo-hydraulic type system.
— The second solution is to use a very long force measurement device which allows the completion of a test
before the reflected wave returns to the measurement point. The elastic-bar-type system is based on the
latter approach.
The second problem is the need for rapid and accurate measurements of displacement or test piece
elongation.
— Conventional extensometers are unsuitable because of their large inertia. Non-contact type methods
such as optical and laser devices should be
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