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. This document specifies the definitions and describes the general principles including all aspects that are common to the individual test methods described in the subsequent parts.

Different deformation modes can 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.

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.

Cross References:
ISO 6721-4
ISO 6721-12
ISO 6721-8
ISO 6721-6
ISO 4593
ISO 6721-3
ISO 6721-9
ISO 6721-10
ISO 291
ISO 6721-7
ISO 6721-5
ISO 6721-2
ISO 295
ISO 293
ISO 294 (all parts)
ISO 472
ISO 1268 (all parts)
ISO 2818


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