SIST EN ISO 5079:1999

SLOVENSKI STANDARD
SIST EN ISO 5079:1999
01-marec-1999
Tekstilije - Vlakna - Ugotavljanje pretržne sile in pretržnega raztezka posameznih
vlaken (ISO 5079:1995)
Textiles - Fibres - Determination of breaking force and elongation at break of individual
fibres (ISO 5079:1995)
Textilien - Fasern - Bestimmung der Höchstzugkraft und Höchstzugkraftdehnung an
Spinnfasern (ISO 5079:1995)
Textiles - Fibres - Détermination de la force de rupture et de l'allongement a la rupture
des fibres individuelles (ISO 5079:1995)
Ta slovenski standard je istoveten z: EN ISO 5079:1995
ICS:
59.060.01 Tekstilna vlakna na splošno Textile fibres in general
SIST EN ISO 5079:1999 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 5079:1999

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SIST EN ISO 5079:1999

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SIST EN ISO 5079:1999

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SIST EN ISO 5079:1999

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SIST EN ISO 5079:1999

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SIST EN ISO 5079:1999
IS0
INTERNATIONAL
STANDARD 5079
Second edition
1995-l 2-l 5
Textile fibres - Determination of breaking
force and elongation at break of individual
fibres
- Dhermina tion de la force de r-up ture et de I’allongemen t
Fibres textiles
de rupture des fibres individuelles
Reference number
IS0 5079: 1995(E)

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SIST EN ISO 5079:1999
IS0 5079: 1995(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
(I EC) 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 5079 was prepared by Technical Committee
ISO/TC 38, Textiles, Subcommittee SC 6, Fibre testing.
This second edition cancels and replaces the first edition
(IS0 5079:1977), which has been technically revised.
Annex A of this International Standard is for information only.
0 IS0 1995
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
Printed in Switzerland

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SIST EN ISO 5079:1999
IS0 5079:1995(E)
INTERNATIONAL STANDARD 0 Iso
Textile fibres - Determination of breaking force and
elongation at break of individual fibres
below. Members of IEC and IS0 maintain registers
1 Scope
of currently valid International Standards.
This International Standard specifies the method and
IS0 139: 1973, Textiles
- Standard atmospheres for
conditions of test for the determination of the break-
conditioning and testing.
ing force and elongation at break of individual fibres
in the conditioned or wet state.
IS0 1130:1975, Textile fibres - Some methods of
The determination of these fibre properties, when sampling for testing.
carried out on different kinds of testing equipment,
IS0 1973:1995, Textile fibres - Determination of lin-
will not generally give identical results. To avoid such
ear density - Gravimetric method and vibroscope
differences, this International Standard is restricted to
method.
the use of constant-rate-of-extension testing appar-
atus.
IS0 2602:1980, Statistical interpretation of test re-
The method is applicable to all fibres, including
sults - Estimation of the mean - Confidence
crimped fibres, provided that the length of fibre avail-
interval.
able enables the initial length specified in this Inter-
national Standard to be used. IS0 3060:1974, Textiles - Cotton fibres - Determi-
nation of breaking tenacity of flat bundles.
NOTE 1 For natural fibres (especially wool and cotton)
the breaking test most commonly performed is that of
IWTO 32-82, Determination of the bundle strength of
bundles of fibres (see IS0 3060 and IWTO 32-82).
wool fibres, International Wool Textile Organization,
Brussels.
2 Normative references
The following standards contain provisions which, 3 Definitions
through reference in this text, constitute provisions
of this International Standard. At the time of pub- For the purposes of this International Standard, the
lication, the editions indicated were valid. All stan- following definitions apply.
dards are subject to revision, and parties to
agreements based on this International Standard are 3.1 breaking force: Maximum force applied to a
encouraged to investigate the possibility of applying test specimen carried to rupture during a tensile test
the most recent editions of the standards indicated under specified conditions (see A, in figure 1).
1

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SIST EN ISO 5079:1999
IS0 5079:1995(E)
Force
Al
Bl
B2 Elongation
A2
Figure 1 - Typical force/elongation curve
3.11 breaking tenacity: Breaking force divided by
3.2 force at rupture: Final force just before com-
the linear density.
plete rupture of the test specimen (see B, in
figure 1).
3.3 extension: Increase in length of a test speci-
4 Principle
men, produced by a force on that specimen, ex-
pressed in units of length.
An individual fibre is extended at a constant rate until
rupture occurs. The elongation of the fibre and the
3.4 elongation: Ratio of the extension of a test
force required are measured.
specimen to its initial length, expressed as a percent-
age. To calculate the breaking tenacity, the linear density
of the individual fibres or the mean linear density of
the laboratory sample is also required (see IS0 1973).
3.5 elongation at break: Elongation of a test
specimen produced by the breaking force (see A, in
figure 1).
5 Apparatus and reagents
3.6 elongation at rupture: Elongation of a test
specimen corresponding to rupture (see B, in
figure 1).
5.1 Tensile testing machine, with suitable clamps
for gripping individual fibres at the required initial
3.7 gauge length: Distance between two effective
length, means for stretching the fibre to rupture at
clamping points of a testing device.
constant rate of extension by moving one of the
clamps, and means for recording the force applied
3.8 initial length: Length of a test specimen under
to the fibre and the corresponding extension (elon-
specified pretension at the beginning of a test.
gation).
NOTE 2 For a tensile test, the initial length is measured
A device giving a force/extension (tenacitylelonga-
between the two effective clamping points.
tion) curve to indicate whether fibre slippage is oc-
curring in the clamps is useful. A digital display or
3.9 pretension: Tension applied to a test specimen
data-collecting system may be used in addition. Ad-
at the beginning of a tensile test.
vice on mounting of test specimens is given in
annex A.
3.10 tension: Force tending to cause the extension
of a body.
5.1.1 The machine shall be capable of operating at
various constant rates of extension between at least
NOTE 3 In textile testing, the tension applied is based on
5 mm/min and 20 mm/min.
the linear density or cross-sectional area.
2

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SIST EN ISO 5079:1999
IS0 5079:1995(E)
0 IS0
b) 100 % elongation per minute, for specimens with
5.12 The machine shall meet the following require-
a mean elongation at break equal to or greater
ments of accuracy and repeatability.
than 8 %.
a) The error in indication of the force shall not ex-
...