EN ISO 527-4:1997

SLOVENSKI STANDARD
01-maj-1999
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Plastics - Determination of tensile properties - Part 4: Test conditions for isotropic and
orthotopic fibre-reinforced plastic composites (ISO 527-4:1997)
Kunststoffe - Bestimmung der Zugeigenschaften - Teil 4: Prüfbedingungen für isotrop
und anisotrop faserverstärkte Kunststoffverbundwerkstoffe (ISO 527-4:1997)
Plastiques - Détermination des propriétés en traction - Partie 4: Conditions d'essai pour
les composites plastiques renforcés de fibres isotropes et orthotropes (ISO 527-4:1997)
Ta slovenski standard je istoveten z: EN ISO 527-4:1997
ICS:
83.120 2MDþDQLSROLPHUL Reinforced plastics
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

INTERNATIONAL
IS0
STANDARD
527-4
First edition
1997-04-I 5
Plastics - Determination of tensile
properties -
Part 4:
Test conditions for isotropic and orthotropic
fibre-reinforced plastic composites
Plastiques - Dktermination des propriMs en traction -
Pattie 4: Conditions d ’essai pour /es composites plastiques renforcks de
fibres isotropes et orthotropes
Reference number
IS0 527-4: 1997(E)
IS0 527-4: 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 527-4 was prepared by Technical Committee
lSO/TC 61, Plastics, Subcommittee SC 2, Mechanical properties.
Together with part 5, 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 1: Genera/ principles
- Part 2: Test conditions for moulding and extrusion plastics
- Part 3: Test conditions for sheet and film
- Pat? 4: Test conditions for isotropic and orthotropic fibre-reinforced
plastic composites
- Part 5: Test conditions for unidirectional fibre-reinforced plastic
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
Internet central @ iso.ch
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Printed in Switzerland
ii
IS0 527-4: 1997(E)
INTERNATIONAL STANDARD @ Iso
- Determination of tensile properties -
Plastics
Part 4:
Test conditions for isotropic and orthotropic fibre-reinforced plastic
composites
1 Scope
1.1 This part of IS0 527 specifies the test conditions for the determination of the tensile properties of isotropic and
orthotropic fibre-reinforced plastic composites, based upon the general principles given in part 1.
Unidirectionally reinforced materials are covered by part 5.
1.2 See IS0 527-l) subclause 1.2.
1.3 The test method is suitable for use with the following materials:
- fibre-reinforced thermosetting and thermoplastic composites incorporating non-unidirectional reinforcements
such as mats, woven fabrics, woven rovings, chopped strands, combinations of such reinforcements, hybrids,
rovings, short or milled fibres or preimpregnated materials (prepregs) (for directly injection-moulded specimens,
see specimen 1A in IS0 527.2:1993);
- combinations of the above with unidirectional reinforcements and multidirectional reinforced materials
constructed from unidirectional layers, provided such laminates are symmetrical (for materials with completely,
or mainly, unidirectional reinforcements, see IS0 527-5);
- finished products made from these materials.
The reinforcement fibres covered include glass fibres, carbon fibres, aramid fibres and other similar fibres.
1.4 The method is performed using specimens machined from a test panel made in accordance with IS0 1268 or
by equivalent methods, or from finished and semi-finished products with suitable flat areas.
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
IS0 527-4: 1997(E)
Determination of tensile properties - Part 2: Test conditions for moulding and
IS0 527-2:1993, Plastics -
extrusion plastics.
IS0 527-5: 1997, Plastics - Determination of tensile properlies - Part 5: Test conditions for unidirectional fibre-
reinforced plastic composites.
Preparation of glass fibre reinforced, resin bonded, low-pressure laminated plates or
IS0 1268:1974, Plastics -
panels for test purposes.
- Preparation of test specimens by machining.
IS0 2818: 1994, Plastics
Part I: Probability and general statistical terms.
IS0 3534-i :I 993, Statistics - Vocabulary and symbols -
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 527-1, subclause 4.1.
4.2 speed of testing: See IS0 527-1, subclause 4.2.
4.3 tensile stress, 0 (engineering): See IS0 527-1, subclause 4.3, except that 0 for “1 ’‘-direction specimens is
defined as 01 and for “2 ’‘-direction specimens as 02 (see 4.8 for definitions of these directions).
tensile strength, 0~: See IS0 527-1, subclause 4.3.3, except that CM for “1 ’‘-direction specimens is defined
4.3.1
as 0~1 and for “2 ’‘-direction specimens as 0~2.
4.4 tensile strain, E: See IS0 527-1, subclause 4.4, except that E for “1 ’‘-direction specimens is defined as q and
for “2 ’‘-direction 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 “1 ’‘-direction specimens, &M is defined as &Ml and for “2 ’‘-direction specimens as EM2.
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
“Y-direction specimens is defined as El and for “2 ’‘-direction 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 I),
unless alternative values are given in the material or technical specifications.
4.7 Poisson ’s ratio, p: See IS0 527-1, subclause 4.7, except that for “1 ’‘-direction specimens pb is defined as ,q2
and ph as ~13, using the coordinates shown in figure 2. For “2 ’‘-direction specimens, pb is defined as ~21 and ph as
.
p23
@ IS0 IS0 527=4:1997(E)
4.8 specimen coordinate axes: The “1 ’‘-direction is normally defined in terms of a feature associated with the
material structure or the production process, such as the length direction in continuous-sheet processes (see
figure 2). The “2 ’‘-direction is perpendicular to the “1 ’‘-direction.
NOTES
1 The “V-direction is also referred to as the 0’ or longitudinal direction and the “2 ’‘-direction as the 90° or transverse direction-
2 For unidirectionai materials covered by part 5 of this International Standard, the direction parallel to the fibres is defined as
the “Y-direction and the direction perpendicular to the fibres (in the plane of the fibres) as the “2 ’‘-direction.
b
.
z
aJ
L
fs
E=d;-d’
tF - 6
6”
6’
Strain, E
(= 0,000 5) (= 0,002 5)
Figure 1 - Stress-strain curve
Fibre-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 52.2 does not apply.
NOTE -
It is recommended that alignment of the specimen and loading train be checked as described in annex B.
IS0 527-4: 1997(E) @ IS0
6 Test specimens
6.1 Shape and dimensions
Three types of test specimen are specified for use with this part of IS0 527, as detailed and illustrated in figure 3
(type 1 B) and figure 4 (types 2 and 3).
Type 1 B is for testing fibre-reinforced thermoplastics. Type IB specimens may also be used for fibre-reinforced
thermosets if they break within the gauge length. Type IB shall not be used for multidirectional, continuous-fibre-
reinforced materials.
Type 2 (rectangular without end
...