BS EN ISO 6721-1:2019 – TC:2020 Edition
$186.33
Tracked Changes. Plastics. Determination of dynamic mechanical properties – General principles
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 69 |
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.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 39 | National foreword |
| 41 | European foreword |
| 43 | Foreword |
| 44 | Introduction |
| 46 | 1 Scope 2 Normative references |
| 47 | 3 Terms and definitions |
| 54 | 4 Principle |
| 57 | 5 Test apparatus 5.1 Type 5.2 Mechanical, electronic and recording systems 5.3 Temperature-controlled enclosure 5.4 Gas supply 5.5 Temperature-measurement device 5.6 Devices for measuring test specimen dimensions 6 Test specimens 6.1 General |
| 58 | 6.2 Shape and dimensions 6.3 Preparation 7 Number of test specimens 8 Conditioning 9 Procedure 9.1 Test atmosphere 9.2 Measurement of specimen cross-section 9.3 Mounting the test specimens 9.4 Varying the temperature |
| 59 | 9.5 Varying the frequency 9.6 Varying the dynamic-strain amplitude 10 Expression of results |
| 60 | 11 Precision 12 Test report |
| 61 | Annex A (informative) Resonance curves |
| 66 | Annex B (informative) Deviations from linear behaviour |
| 67 | Bibliography |
