This 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 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 DN 200 or greater.
Method B is applicable to all types of GRP pipes. It is usually used for
pipes with a nominal size up to DN 300.
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 OE pipe.
Results from one method are not necessarily equal to the results derived
from any of the alternative methods. However, all methods have equal
validity.
In dieser ÖNORM werden 3 Prüfverfahren festgelegt, welche zur Ermittlung der Längszug-Eigenschaften von Rohren aus glasfaserverstärkten duroplastischen Kunststoffen dienen, und zwar im Hinblick auf - die Längszug-Festigkeit - die prozentuale Dehnung beim Versagen und - den Elastizitätsmodul in Längsrichtung. Die 3 angeführten Prüfverfahren sind jeweils für ein bestimmtes Herstellungsverfahren von GFK-Rohren anzuwenden.