EN ISO 6721-1:2011

Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Test apparatus
6 Test specimens
7 Number of test specimens
8 Conditioning
9 Procedure
10 Expression of results
11 Precision
12 Test report
Annex A (informative) - Resonance curves
Annex B (informative) - Deviations from linear behaviour
Bibliography

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.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.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.