ISO 8513:2000
(Main)Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of longitudinal tensile properties
Plastics piping systems — Glass-reinforced thermosetting plastics (GRP) pipes — Determination of longitudinal tensile properties
Systèmes de canalisations en plastiques — Tubes en plastiques thermodurcissables renforcés de verre (PRV) — Détermination des propriétés en traction longitudinale
General Information
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Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 8513
First edition
2000-11-15
Plastics piping systems — Glass-reinforced
thermosetting plastics (GRP) pipes —
Determination of longitudinal tensile
properties
Systèmes de canalisations en plastiques — Tubes en plastiques
thermodurcissables renforcés de verre (PRV) — Détermination des
propriétés en traction longitudinale
Reference number
ISO 8513:2000(E)
© ISO 2000
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ISO 8513:2000(E)
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ISO 8513:2000(E)
Contents Page
1 Scope . 1
2 Terms and definitions . 1
3 Principle . 2
4 Apparatus . 2
5 Test pieces . 4
6 Conditioning . 7
7 Test temperature . 7
8 Procedure (methods A, B and C) . 7
9 Calculation . 8
10 Test report . 11
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ISO 8513:2000(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 com-
mittees. 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 liai-
son with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 3.
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.
Attention is drawn to the possibility that some of the elements of this International Standard may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights.
International Standard ISO 8513 was prepared by Technical Committee ISO/TC 138, Plastics pipes, fittings and
valves for the transport of fluids, Subcommittee SC 6, Reinforced plastics pipes and fittings for all applications.
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INTERNATIONAL STANDARD ISO 8513:2000(E)
Plastics piping systems — Glass-reinforced thermosetting plastics
(GRP) pipes — Determination of longitudinal tensile properties
1 Scope
This International Standard specifies three test methods for determining the longitudinal tensile properties of pipes of
glass-reinforced thermosetting plastics (GRP). The properties which can be determined are:
— the longitudinal tensile strength
— the percentage ultimate elongation
— the longitudinal modulus of elasticity.
Method A uses for the test piece(s) a longitudinal strip cut from a pipe.
Method B uses a specified length of the full cross-section of the pipe.
Method C uses a notched plate cut from a pipe wall section.
Method A is applicable to pipes with a nominal size of DN 50 or greater with circumferentially wound filaments, with
or without chopped glass and/or woven rovings and/or fillers, and to centrifugally cast pipes. It is applicable to those
pipes with helically wound filaments with a nominal size of DN 200 or greater.
Method B is applicable to all types of GRP pipe. It is usually used for pipes with a nominal size up to and including
DN 150.
�
Method C is primarily intended for use for helically wound pipes with a winding angle other than approximately 90 .
This method may also be used for other types of pipe.
Results from one method are not necessarily equal to the results derived from any of the alternative methods. How-
ever, all methods have equal validity.
2 Terms and definitions
For the purposes of this International Standard, the following terms and definitions apply.
2.1
initial longitudinal tensile strength
�,, � �
LA LB LC
maximum tensile force in the longitudinal direction per unit mean circumference (see 2.6) at failure (the subscripts A,
B and C denote the method of test used)
NOTE It is expressed in newtons per millimetre of circumference (N/mm).
2.2
ultimate longitudinal tensile stress
L
maximum longitudinal tensile force per unit cross-sectional area at failure
NOTE It is expressed in newtons per square millimetre (N/mm).
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ISO 8513:2000(E)
2.3
ultimate elongation
"
L
elongation coincident with the ultimate longitudinal tensile stress (see 2.2)
NOTE It is expressed as a percentage of an initial gauge length or free length of a test piece.
2.4
longitudinal modulus of elasticity
E
L
longitudinal tensile force per unit cross-sectional area divided by the strain
2
NOTE It is expressed in newtons per square millimetre (N/mm ).
2.5
mean diameter
d
m
diameter of the circle corresponding with the middle of the pipe wall cross-section
NOTE 1 It is given by any of the following:
a) the average of the external diameter of the pipe minus the average of the wall thickness;
b) the external circumference of the pipe divided by(� 3,141 6) minus the average of the wall thickness;
c) the average of the internal diameter of the pipe plus the average of the wall thickness.
NOTE 2 It is expressed in millimetres.
2.6
mean circumference
circumference corresponding to the mean diameter (see 2.5) multiplied by(� 3,141 6)
NOTE It is expressed in millimetres.
3Principle
Test pieces comprising either strips cut longitudinally from a pipe wall segment (method A), a specified length of pipe
(method B) or a notched plate cut from a pipe wall section (method C) are subjected to extension in the longitudinal
direction at a constant speed such that fracture occurs within a specified time.
The tensile properties are determined using the initial dimensions of the test piece, the tensile force and the elonga-
tion.
NOTE It is assumed that the following test parameters are set by the standard making reference to this International Standard:
a) the methods to be used, i.e. method A, method B or method C;
b) the number of test pieces (see 5.5);
c) if applicable, the requirements for conditioning, e.g. temperature, humidity, time and associated tolerances (see clause 6);
d) the test temperature and its tolerance (see clause 7);
e) thepropertiestobemeasured(seeclause8).
4 Apparatus
4.1 Tensile-testing machine, of the constant rate of cross-head movement type, incorporating the following fea-
tures:
a) a fixed part, fitted with a grip to hold one end of the test piece without permitting any longitudinal movement
thereof, and a moveable part, incorporating a grip to hold the other end of the test piece during extension (the
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ISO 8513:2000(E)
fixed and moving parts and their associated grips (see 4.2) shall enable the test piece to be aligned when a force
is applied so that its longitudinal axis coincides with the direction of this force);
b) a drive mechanism, capable of imparting a constant speed of 1 mm/min to the moving part;
c) a force indicator, capable of measuring the force applied to a test piece which is held in the grips (the mechanism
shall be free from significant inertia lag at the necessary speed of testing and shall indicate or record force, or
consequent stress, with an accuracy of within�1% of the value to be measured).
4.2 Grips, for holding the test piece. Each of the two the grips shall be capable of holding one end of the test piece
without slip or crushing to an extent that will affect the results obtained. Grips which tighten automatically may be
suitable. Typical grips for a pipe section test piece (see 5.3) are shown in Figure 1.
Key
1 Mandrel
2 Segmented grips
3Sleeve
4 Reinforcing band
5Testpiece
Figure 1 — Typical grips for a pipe section test piece (method B)
4.3 Dimension measurement devices, capable of measuring the necessary dimensions of the test piece (e.g.
length, width, wall thickness) to an accuracy of half the accuracy required in clause 8 for measurements, e.g. a meas-
uring accuracy� 0,1 mm requires a device accuracy of� 0,05 mm.
4.4 Extension indicator, if required, capable of measuring the distance between two fixed points located within
the gauge length of the test piece so that the elongation in the gauge section can be determined. The device shall be
free of any significant inertia lag at the relevant speed of testing (see 8.4) and shall be accurate to within�1% of the
indicated value.
If strain gauges are used, these shall be mounted on both sides of the test piece, on the centreline, and the average
value shall be used for the calculation of the modulus and the percentage elongation.
NOTE 1 An extension indicator is only necessary if the referring standard specifies that the elongation and/or any modulus of
elasticity of the test piece is to be determined.
NOTE 2 It is desirable, but not essential, that this instrument automatically records this distance (or any change in it) as a func-
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