EN ISO 527-5:1997

SLOVENSKI STANDARD
SIST EN ISO 527-5:1999
01-maj-1999
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Plastics - Determination of tensile properties - Part 5: Test conditions for unidirectional
fibre-reinforced plastic composites (ISO 527-5:1997)
Kunststoffe - Bestimmung der Zugeigenschaften - Teil 5: Prüfbedingungen für
unidirektional faserverstärkte Kunststoffverbundwerkstoffe (ISO 527-5:1997)
Plastiques - Détermination des propriétés en traction - Partie 5: Conditions d'essai pour
les composites plastiques renforcés de fibres unidirectionnelles (ISO 527-5:1997)
Ta slovenski standard je istoveten z: EN ISO 527-5:1997
ICS:
83.120 2MDþDQLSROLPHUL Reinforced plastics
SIST EN ISO 527-5:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 527-5:1999

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SIST EN ISO 527-5:1999

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SIST EN ISO 527-5:1999

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SIST EN ISO 527-5:1999

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SIST EN ISO 527-5:1999

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SIST EN ISO 527-5:1999
INTERNATIONAL
IS0
STANDARD 527-5
First edition
1997-04- 15
Plastics - Determination of tensile
properties -
Part 5:
Test conditions for unidirectional
fibre-reinforced plastic composites
Plastiques - Dktermination des propriMs en traction -
Pattie 5: Conditions d’essai pour /es composites plastiques renforcks de
fibres unidirectionnelles
Reference number
IS0 527-5: 1997(E)

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SIST EN ISO 527-5:1999
IS0 527-5: 1997(E)
Foreword
IS0 (the International Organization for Standardization) is a worldwide
federation of national standards bodies (IS0 member bodies). The work of
preparing International Standards is normally carried out through IS0
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. IS0
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
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.
International Standard IS0 527-5 was prepared by Technical Committee
ISOmC 61, Plastics, Subcommittee SC 2, Mechanical properties.
Together with part 4, this part of IS0 527 cancels and replaces the first
edition of IS0 3268 (IS0 3268:1978), which has been technically revised.
IS0 527 consists of the following parts, under the general title Plastics -
Determination of tensile properties:
Part I: General principles
- Part 2: Test conditions for moulding and extrusion plastics
- Part 3: Test conditions for sheet and film
- Part 4: Test conditions for isotropic and orthotropic fibre-reinforced
plastic composites
unidirectional fibre-reinforced p/as tic
- Parf5: Test conditions for
composites
Annex A forms an integral part of this part of IS0 527. Annex B is for
information only.
0 IS0 1997
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronic or mechanical, including photocopying and
microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 l CH-1211 Geneve 20 l Switzerland
central @ iso.ch
Internet
x.400 c=ch; a=400net; p=iso; o=isocs; s=central
Printed in Switzerland
ii

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SIST EN ISO 527-5:1999
INTERNATIONAL STANDARD @ Iso IS0 527-5: 1997(E)
- Determination of tensile properties -
Plastics
Part 5:
Test conditions for unidirectional fibre-reinforced plastic composites
1 Scope
1 .l This part of IS0 527 specifies the test conditions for the determination of the tensile properties of unidirectional
fibre-reinforced plastic composites, based upon the general principles given in part 1.
1.2 See IS0 527-1, subclause 1.2.
1.3 The test method is suitable for all polymer matrix systems reinforced with unidirectional fibres and which meet
the requirements, including failure mode, set out in this part of IS0 527.
The method is suitable for composites with either thermoplastic or thermosetting matrices, including preimpregnated
materials (prepregs). The reinforcements covered include carbon fibres, glass fibres, aramid fibres and other similar
fibres. The reinforcement geometries covered include unidirectional (i.e. completely aligned) fibres and rovings and
unidirectional fabrics and tapes.
The method is not normally suitable for multidirectional materials composed of several unidirectional layers at
different angles (see IS0 527-4).
1.4 The method is performed using one of two different types of test specimen, depending on the direction of the
applied stress relative to the fibre direction (see clause 6).
1.5 See IS0 527-1, subclause 1.5.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this part of
IS0 527. At the time of publication, the editions indicated were valid. All standards are subject to revision, and
parties to agreements based on this part of IS0 527 are encouraged to investigate the possibility of applying the
most recent editions of the standards indicated below. Members of IEC and IS0 maintain registers of currently valid
International Standards.
- Determination of tensile properties - Part I: General principles.
IS0 527-l : 1993, Plastics
IS0 527-4: 1997, Plastics - Determination of tensile properfies - Pat? 4: Test conditions for isotropic and
orthotropic fibre-reinforced plastic composites.
1

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SIST EN ISO 527-5:1999
@ IS0
IS0 527-5: 1997(E)
Preparation of glass fibre reinforced, resin bonded, low-pressure laminated p/a tes or
IS0 1268:1974, Plastics -
panels for test purposes.
IS0 2818:1994, Plastics - Preparation of test specimens by machining.
- Part 1: Probability and general statistical terms.
IS0 3534-l :I 993, Statistics - Vocabulary and symbols
- Preparation of unidirectional panals by winding.
Textile-glass-reinforced plastics - Rovings
IS0 9291: 1996,
3 Principle
See IS0 527-1, clause 3.
4 Definitions
For the purposes of this part of IS0 527, the following definitions apply.
4.1 gauge length: See IS0 527-l) subclause 4.1.
4.2 speed of testing: See IS0 527-1, subclause 4.2.
4.3 tensile stress, CT (engineering): See IS0 527-1, subclause 4.3, except that 0 for type A specimens is defined
as q and for type B specimens as 02 (see clause 6 for details of type A and B specimens).
4.3.1 tensile strength, q$ See IS0 527-1, subclause 4.3.3, except that 0~ for type A specimens is defined as
0~1 and for type B specimens as 0M2.
4.4 tensile strain, E: The increase in length per unit length of the original gauge length.
For type A specimens, E is defined as q and for type B specimens as ~2.
It is expressed as a dimensionless ratio or in percent.
4.5 tensile strain at tensile strength; tensile failure strain, &M: The tensile strain at the point corresponding to
the tensile strength of the specimen.
For type A specimens, &M is defined as &Ml and for type B Specimens as &M2.
It is expressed as a dimensionless ratio or in percent.
4.6 modulus of elasticity in tension; Young’s modulus, E: See IS0 527-1, subclause 4.6, except that E for
type A specimens is defined as El and for type B specimens as E2.
The strain values used are as given in IS0 527-1, subclause 4.6, i.e. E’ = 0,000 5 and E” = 0,002 5 (see figure l),
unless alternative values are given in the material or technical specifications.
Poisson’s ratio, p: See IS0 527-1, subclause 4.7, except that for type A specimens cub is defined as ~12 and
4.7
ph as ~13, using the coordinates shown in figure 2. For type B specimens, pb is defined as ~21 and ,uh as ~23.
4.8 specimen coordinate axes: The coordinate axes for the material under test are defined in figure 2. The
direction parallel to the fibres is defined as the “1’‘-direction and the direction perpendicular to them (in the plane of
the fibres) as the “2’‘-direction.
NOTE - The “1’‘-direction is also referred to as the 0” or longitudinal direction and the “2’‘-direction as the 90” or transverse
direction.
2

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SIST EN ISO 527-5:1999
IS0 527-5: 1997(E)
b
vi
:
L
z E = 6” - 6’
&‘- &
6"
Strain, E
(= 0,000 5) I= 0,002 5)
Figure 1 - Stress-strain curve
- Unidirectionlly reinforced plastic composite showing axes of symmetry
Figure 2
5 Apparatus
See IS0 527-1, clause 5, except for the following:
The micrometer or its equivalent (see 52.1) shall read to 0,Ol mm or better. It shall have a suitable-size ball-ended
anvil if used on irregular surfaces and a flat anvil if used on flat, smooth (e.g. machined) surfaces.
Subclause 5.2.2 does not apply.
Care shall be exercised to ensure that the pressure exerted by the grips (see 5.1.3) is only sufficient to prevent the
specimen slipping in the grip when loaded to failure. Excessive grip pressure may cause crushing of the specimen
due to the low transverse strength of these materials. Hydraulic grips which can be set at a constant grip pressure
are preferred.
If strain gauges bonded to the specimen are used, the errors produced by the transverse effect on the transverse
gauge will generally be much larg
...