EN 17129:2018

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.þHQHKontinuierliche faserverstärkte Kunststoffverbunde - Gezogene unidirektionale Stäbe - Bestimmung der Zugeigenschaften parallel zur FaserrichtungComposites plastiques renforcés de fibres continues - Joncs unidirectionnels pultrudés - Détermination des propriétés en traction parallèlement à la direction des fibresContinuous-fibre-reinforced plastic composites - Pultruded unidirectional rods - Determination of tensile properties in parallel to the fibre direction83.120Reinforced plasticsICS:Ta slovenski standard je istoveten z:EN 17129:2018SIST EN 17129:2019en,fr,de01-januar-2019SIST EN 17129:2019SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 17129
November
t r s z ICS
z uä s t r English Version
Continuousæfibreæreinforced plastic composites æ Pultruded unidirectional rods æ Determination of tensile properties in parallel to the fibre direction Composites plastiques renforcés de fibres continues æ Joncs unidirectionnels pultrudés æ Détermination des propriétés en traction parallèlement à la direction des fibres
Kontinuierliche faserverstärkte Kunststoffverbunde æ Gezogene unidirektionale Stäbe æ Bestimmung der Zugeigenschaften parallel zur Faserrichtung This European Standard was approved by CEN on
v June
t r s zä
egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä
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s y s t {ã t r s z ESIST EN 17129:2019

Example of alternative test fixture . 19 Annex B (informative)
Specimen preparation with bonded end tabs . 20 Bibliography . 22 SIST EN 17129:2019

force per unit area of the original cross-section within the gauge length Note 1 to entry: It is expressed in megapascals (MPa). [SOURCE: adapted from EN ISO 527-1:2012, definition 3.6] 3.5 tensile strength M maximum tensile stress sustained by the specimen during a tensile test Note 1 to entry: It is expressed in megapascals (MPa). Note 2 to entry: It is corresponding to the stress at break. 3.6 strain
increase in length per unit original length Note 1 to entry: It is expressed as a dimensionless ratio, or as a percentage (%). [SOURCE: EN ISO 527-1:2012, definition 3.7] 3.7 tensile strain at tensile strength tensile failure strain M tensile strain at the point corresponding to the tensile strength Note 1 to entry: It is expressed as a dimensionless ratio, or as a percentage (%). Note 2 to entry: See Figure 1. Note 3 to entry: It is corresponding to the strain at break. SIST EN 17129:2019

Key X strain,
Y stress,
a slope, Et Figure 1 — Typical stress-strain curve SIST EN 17129:2019

Figure 2 — Unidirectional rod showing axes of symmetry 4 Principle and methods 4.1 Principle The test specimen is extended along its major longitudinal axis at constant speed until the specimen fractures or until the stress (load) or the strain (elongation) reaches some predetermined value. During this procedure the load sustained by the specimen and the elongation are measured. 4.2 Method 4.2.1 The use of conventional grips for testing unidirectional pultruded rods having high axial tensile strength and low transverse compressive strength can cause crushing of the rod, thereby causing premature failure, due to the high compressive forces exerted by the grips. Steel tabs, the design of which is adapted to the shape of the rod, reduce the compressive forces exerted on the rod and overcome this negative influence of conventional grips. NOTE Conventional metallic tabs offer a high performance level and have been found satisfactory for testing rods. However, some limitations such as testing at low or high temperature have led to use alternative test fixtures. Alternative test fixtures may be used provided that the radial compression on the rods prevents any slippage of the specimens relatively to the fixture during testing and that the failures occur outside of the gripping areas. As testing rods of larger diameter, than the standard 6 mm diameter rod, has some limitations (e.g. testing machines of high capacity required, high load transfer into specimens) smaller specimens and alternative fixtures may be used provided that the general requirements of this document are fulfilled. Informative Annex A describes an alternative test fixture, which may be used for testing specimens without end-tabs. 4.2.2 Tests which are carried out on specimens of different dimensions, or on specimens which are prepared under different conditions, may produce results which are not comparable. Other factors,
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