NF EN ISO 6721-1

Les différentes parties de l'ISO 6721 prescrivent des méthodes pour la détermination des propriétés mécaniques dynamiques des plastiques rigides dans le domaine du comportement viscoélastique linéaire. La partie 1 établit des principes généraux incluant des définitions et tous les aspects communs à toutes les méthodes individuelles.

<p>The various parts of ISO 6721 specify methods for the determination of the dynamic mechanical properties of rigid plastics within the region of linear viscoelastic behaviour. ISO 6721-1:2011 is an introductory section which includes the definitions and all aspects that are common to the individual test methods described in the subsequent parts.</p> <p>Different deformation modes may produce results that are not directly comparable. For example, tensile vibration results in a stress which is uniform across the whole thickness of the specimen, whereas flexural measurements are influenced preferentially by the properties of the surface regions of the specimen.</p> <p>Values derived from flexural-test data will be comparable to those derived from tensile-test data only at strain levels where the stress-strain relationship is linear and for specimens which have a homogeneous structure.</p>