EN ISO 20337:2019

Fibre-reinforced plastic composites - Shear test method using a shear frame for the determination of the in-plane shear stress/shear strain response and shear modulus (ISO 20337:2018)

This document specifies a method using a shear test apparatus for measuring the in-plane shear stress/shear strain response, shear modulus and shear strength of continuous-fibre-reinforced plastic composite materials with fibre orientations of 0° and 0°/90°.
This method is applicable to thermoset and thermoplastic matrix laminates made from unidirectional layers/non-woven fabrics and/or fabrics including unidirectional fabrics, with the fibres oriented at 0° and 0°/90° to the specimen axis, where the lay-up is symmetrical and balanced about the specimen mid-plane.
The method is suitable for determining shear properties in both the linear and nonlinear load-deformation range even at shear strains greater than 5 %.
Short and long fibre-reinforced plastic composites can also be tested using this document.

Faserverstärkte Kunststoffe - Schubversuch mittels Schubrahmen zur Ermittlung der Schubspannungs-/Schubverformungskurve und des Schubmoduls in der Lagenebene (ISO 20337:2018)

Dieses Dokument legt ein Verfahren zur Bestimmung der Schubspannungs-Schubverformungs-Kurve, des Schubmoduls und der Schubfestigkeit von endlosfaserverstärkten Kunststoffen mit einer Faserorientierung in 0° bzw. 0°/90° mittels einer Schubprüfvorrichtung in der Lagenebene fest.
Das Verfahren ist anwendbar auf Laminate, die aus einer thermoplastischen oder duroplastischen Grund-masse und aus unidirektionalen Lagen/Gelegen und/oder Geweben einschließlich unidirektionaler Gewebe mit einer Faserorientierung in 0° bzw. 0°/90° zur Probekörperachse bestehen. Der Laminataufbau muss symmetrisch und ausgeglichen um die Mittelebene des Probekörpers gestaltet werden.
Das Verfahren ist für die Bestimmung der Schubeigenschaften sowohl im linearen als auch im nicht-linearen Last-Verformungs-Bereich bei Schubverformungen auch über 5 % geeignet.
In Anlehnung an dieses Dokument können auch kurz- und langfaserverstärkte Kunststoffe geprüft werden.

Composites plastiques renforcés de fibres - Méthode d'essai de cisaillement à l'aide d'un châssis de cisaillement pour la détermination de la contrainte de cisaillement /déformation au cisaillement dans le plan et du module de cisaillement (ISO 20337:2018)

Le présent document spécifie une méthode utilisant un appareillage d'essai de cisaillement pour mesurer la contrainte de cisaillement/déformation au cisaillement dans le plan, le module de cisaillement et la résistance au cisaillement des matériaux composites plastiques renforcés de fibres continues avec une orientation des fibres de 0° et 0°/90°.
Cette méthode est applicable aux stratifiés à matrice thermodurcie et thermoplastique constitués de couches unidirectionnelles/non-tissés et/ou tissus, y compris tissus unidirectionnels, avec les fibres orientées à 0° et 0°/90° par rapport à l'axe de l'éprouvette, dans lesquels l'assemblage est symétrique et équilibré par rapport au plan médian de l'éprouvette.
Cette méthode convient pour déterminer les propriétés de cisaillement à la fois dans la plage de déformation de la charge linéaire et non linéaire, même à des déformations au cisaillement supérieures à 5 %.
Les composites plastiques renforcés de fibres courtes et longues peuvent également être soumis à l'essai selon le présent document.

Z vlakni ojačeni kompozitni polimerni materiali - Metoda strižnega preskusa z uporabo strižnega okvira za ugotavljanje odziva na ravninsko strižno/natezno obremenitev in strižnega modula (ISO 20337:2018)

Ta dokument določa metodo strižnega preskusa z uporabo strižnega okvira za ugotavljanje odziva na ravninsko strižno/natezno obremenitev, strižnega modula in strižne trdnosti z vlakni ojačenih kompozitnih polimernih materialov z usmerjenostjo vlaken 0 ° in 0 °/90 °.
Metoda je uporabna za termoreaktivne in plastomerne matrične laminate, izdelane iz enosmernih slojev/netkanih tkanin in/ali tkanin z enosmernimi vlakni, usmerjenimi 0 ° in 0 °/90 ° na os vzorca, kjer je postavitev simetrična in uravnotežena glede na srednjo ravnino vzorca. Metoda je primerna za določanje strižnih lastnosti v linearnem in nelinearnem razponu deformacije pri obremenitvi, tudi pri strižnih deformacijah, večjih od 5 %. S pomočjo tega dokumenta je mogoče preskusiti tudi s kratkimi in dolgimi vlakni ojačene kompozitne materiale.

General Information

• Status: Published
• Publication Date: 08-Oct-2019
• Withdrawal Date: 29-Apr-2020
• ICS: 83.120 - Reinforced plastics
• Technical Committee: CEN/TC 249 - Plastics
• Drafting Committee: CEN/TC 249 - Plastics
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 09-Oct-2019
• Due Date: 16-Aug-2021
• Completion Date: 09-Oct-2019
• Ref Project: SIST EN ISO 20337:2019 - Fibre-reinforced plastic composites - Shear test method using a shear frame for the determination of the in-plane shear stress/shear strain response and shear modulus (ISO 20337:2018)

Overview

EN ISO 20337:2019 (identical to ISO 20337:2018) specifies a shear test method using a shear frame to determine the in‑plane shear stress / shear strain response, shear modulus and shear strength of fibre‑reinforced plastic composites. Published by CEN and adopted in 2019, the standard applies to continuous‑fibre laminates (thermoset and thermoplastic), unidirectional layers, fabrics and short/long fibre‑reinforced plastics with fibre orientations of 0° and 0°/90°, provided the lay‑up is symmetrical and balanced about the specimen mid‑plane.

Key topics and requirements

• Test principle: Uses a shear frame fixture to impose a near‑pure shear field across the specimen free area; specimen edges are uniformly clamped to avoid fibre rotation and load redistribution.
• Measured outputs: In‑plane shear stress–shear strain curve, in‑plane shear modulus (G12) and in‑plane shear strength (τ12M), including nonlinear behaviour at strains greater than 5%.
• Applicability: Thermoset/thermoplastic matrix laminates, unidirectional and fabric reinforcements, and short/long fibre composites with 0° or 0°/90° fibre orientations.
• Apparatus & instrumentation: Tensile test machine, shear frame fixture, strain measurement system, micrometer for thickness - plus calibration and verification requirements for force measurement.
• Specimen preparation & conditioning: Specifies specimen shape, inspection, number of specimens and conditioning (references ISO 291 for atmospheres). Normative references include ISO 1268, ISO 2818, ISO 2602, ISO 7500‑1 and ISO 12781‑1.
• Data handling: Procedures for test speed, data collection, failure mode identification, calculations and test reporting.

Practical applications and users

Who uses EN ISO 20337:2019:

• Composite material manufacturers and suppliers validating shear performance.
• Test laboratories performing standardized mechanical characterization.
• R&D and materials engineers developing laminates for structural use.
• Quality assurance and certification bodies in aerospace, automotive, wind energy, marine and sporting goods where accurate in‑plane shear data are required.

Why it’s useful:

• Provides reproducible shear properties including nonlinear response at high strains (>5%), enabling designers to assess performance and failure modes for high shear‑elongation materials.
• Supports material selection, laminate design, finite element model validation and compliance testing.

Related standards

• ISO 20337:2018 (original International Standard)
• Normative references within the standard: ISO 291, ISO 1268, ISO 2818, ISO 2602, ISO 7500‑1, ISO 12781‑1
• Alternative/older in‑plane shear methods (e.g., ISO 14129) are noted as having limitations at large shear strains.

Keywords: EN ISO 20337:2019, shear test, shear frame, fibre‑reinforced plastic composites, in‑plane shear, shear modulus, shear strength, composite testing.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2019
Z vlakni ojačeni kompozitni polimerni materiali - Metoda strižnega preskusa z
uporabo strižnega okvira za ugotavljanje odziva na ravninsko strižno/natezno
obremenitev in strižnega modula (ISO 20337:2018)
Fibre-reinforced plastic composites - Shear test method using a shear frame for the
determination of the in-plane shear stress/shear strain response and shear modulus
(ISO 20337:2018)
Faserverstärkte Kunststoffe - Schubversuch mittels Schubrahmen zur Ermittlung der
Schubspannungs-/Schubverformungskurve und des Schubmoduls in der Lagenebene
(ISO 20337:2018)
Composites plastiques renforcés de fibres - Méthode d'essai de cisaillement à l'aide d'un
châssis de cisaillement pour la détermination de la contrainte de cisaillement
/déformation au cisaillement dans le plan et du module de cisaillement (ISO 20337:2018)
Ta slovenski standard je istoveten z: EN ISO 20337:2019
ICS:
83.120 Ojačani polimeri Reinforced plastics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 20337
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2019
EUROPÄISCHE NORM
ICS 83.120
English Version
Fibre-reinforced plastic composites - Shear test method
using a shear frame for the determination of the in-plane
shear stress/shear strain response and shear modulus
(ISO 20337:2018)
Composites plastiques renforcés de fibres - Méthode Faserverstärkte Kunststoffe - Schubversuch mittels
d'essai de cisaillement à l'aide d'un châssis de Schubrahmen zur Ermittlung der Schubspannungs-
cisaillement pour la détermination de la contrainte de /Schubverformungskurve und des Schubmoduls in der
cisaillement /déformation au cisaillement dans le plan Lagenebene (ISO 20337:2018)
et du module de cisaillement (ISO 20337:2018)
This European Standard was approved by CEN on 23 September 2019.

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
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 20337:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 20337:2018 has been prepared by Technical Committee 61 "Platics” of the International
Organization for Standardization (ISO) and has been taken over as EN ISO 20337:2019 by Technical
Committee CEN/TC 249 “Plastics” the secretariat of which is held by NBN.
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 2020, and conflicting national standards shall be
withdrawn at the latest by April 2020.
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.
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 20337:2018 has been approved by CEN as EN ISO 20337:2019 without any modification.

INTERNATIONAL ISO
STANDARD 20337
First edition
2018-11
Fibre-reinforced plastic composites —
Shear test method using a shear frame
for the determination of the in-plane
shear stress/shear strain response
and shear modulus
Composites plastiques renforcés de fibres — Méthode d'essai
de cisaillement à l'aide d'un châssis de cisaillement pour la
détermination de la contrainte de cisaillement /déformation au
cisaillement dans le plan et du module de cisaillement
Reference number
ISO 20337:2018(E)
©
ISO 2018
ISO 20337:2018(E)
© ISO 2018
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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CH-1214 Vernier, Geneva
Phone: [phone]
Fax: [phone]
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Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved

ISO 20337:2018(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Test apparatus . 3
5.1 Tensile test machine . 3
5.1.1 General. 3
5.1.2 Test speeds . 3
5.1.3 Force indicator . 3
5.2 Shear frame . 3
5.3 Strain measurement . 5
5.4 Micrometer . 6
6 Test specimens. 6
6.1 Shape and dimensions . 6
6.2 Preparation of test specimens . 7
6.3 Inspection of the test specimens . 8
6.4 Number of test specimens . 8
6.5 Conditioning of test specimens . 8
7 Procedure. 8
7.1 Test atmosphere . 8
7.2 Determination of the test specimen thickness . 8
7.3 Test speed . 8
7.4 Data collection . 8
7.5 Test termination . 8
7.6 Failure mode . 9
8 Calculation and expression of results .10
9 Test report .10
Bibliography .12
ISO 20337:2018(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
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electrotechnical standardization.
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different types of ISO documents should be noted. This document was drafted in accordance with the
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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
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URL: www .iso .org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 61, Plastics, Subcommittee SC 13,
Composites and reinforcement fibres.
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 2018 – All rights reserved

ISO 20337:2018(E)
Introduction
The test method described in this document uses a shear frame fixture in order to introduce a pure
shear loading throughout the free area of the test specimens. The edges of the test specimens are
uniformly clamped during the test procedure avoiding fibre rotation and load re-distribution effects.
This allows for the ultimate shear strength of high shear-elongation materials to be obtained even at
shear strains higher than 5 % which is a limitation when using ISO 14129 or other standards regarding
in-plane shear test methods for fibre reinforced plastic composites.
INTERNATIONAL STANDARD ISO 20337:2018(E)
Fibre-reinforced plastic composites — Shear test method
using a shear frame for the determination of the in-plane
shear stress/shear strain response and shear modulus
1 Scope
This document specifies a method using a shear test apparatus for measuring the in-plane shear
stress/shear strain response, shear modulus and shear strength of continuous-fibre-reinforced plastic
composite materials with fibre orientations of 0° and 0°/90°.
This method is applicable to thermoset and thermoplastic matrix laminates made from unidirectional
layers/non-woven fabrics and/or fabrics including unidirectional fabrics, with the fibres oriented at
0° and 0°/90° to the specimen axis, where the lay-up is symmetrical and balanced about the specimen
mid-plane.
The method is suitable for determining shear properties in both the linear and nonlinear load-
deformation range even at shear strains greater than 5 %.
Short and long fibre-reinforced plastic composites can also be tested using this document.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 291, Plastics — Standard atmospheres for
...