1.1 This International Standard specifies a method of determining certain tensile properties of textile-glass-reinforced plastics.
The method is applicable to both reinforced thermosetting resins and reinforced thermoplastics.
Injection-moulded test specimens made from reinforced thermoplastics are subject to fibre orientation, and may give values that are untypically high; however, they may be used if other methods of specimen preparation are impracticable.
1.2 The method specifies the determination of the follow-ing tensile properties:
— the initial tangent modulus of elasticity and the tensile secant modulus of elasticity;
NOTE — When it is not possible to determine the initial tangent modulus of elasticity, the tensile secant modulus of elasticity at 0,1 % strain is determined.
— the maximum tensile stress;
NOTE — If there is a clean break, the maximum tensile stress is the tensile stress at break; in other cases, it is the tensile stress corresponding to the maximum force.
— the percentage elongation at maximum force and the percentage elongation at break, as applicable.
NOTE — The force/elongation curves at different temperatures, degrees of humidity and r?tes of strain yield useful information concerning the behaviour of the materials.
1.3 It is only possible to obtain comparable values between different materials if identical test specimens are used. These should also be tested under well-defined conditions of pre-treatment, temperature, humidity and r?te of strain.
1.4 Finally, it is the aim of this method to obtain tensile results that can be used for either
— routine quality control, or
— preparation of specifications for materials.