BS ISO 6721-4:2019 – TC:2020 Edition
$134.27
Tracked Changes. Plastics. Determination of dynamic mechanical properties – Tensile vibration. Non-resonance method
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 37 |
This document describes a forced, non-resonance method for determining the components of the tensile complex modulus E* of polymers at frequencies typically in the range 0,01 Hz to 100 Hz.
Higher frequency measurements can be made, but significant errors in the dynamic properties measured are likely to result (see 10.2.2 and 10.2.3).
The method is suitable for measuring dynamic storage moduli in the range 0,01 GPa to 5 GPa. Although materials with moduli outside this range can be studied, alternative modes of deformation are intended to be used for higher accuracy [i.e. a shear mode for G? < 0,01 GPa (see ISO 6721-6) and a flexural mode for E? > 5 GPa (see ISO 6721-3 or ISO 6721-5)].
This method is particularly suited to the measurement of loss factors and can therefore be conveniently used to study the variation of dynamic properties with temperature and frequency through most of the glass-rubber relaxation region (see ISO 6721-1). The availability of data determined over wide ranges of both frequency and temperature enables master plots to be derived, using frequency-temperature shift procedures, which display dynamic properties over an extended frequency range at different temperatures.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 23 | National foreword |
| 27 | Foreword |
| 28 | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle |
| 29 | 5 Test device 5.1 Loading assembly 5.1.1 General 5.1.2 Clamps 5.1.3 Transducers 5.2 Electronic data-processing equipment 5.3 Temperature measurement and control |
| 30 | 5.4 Devices for measuring test specimen dimensions 6 Test specimens 6.1 General 6.2 Shape and dimensions |
| 31 | 6.3 Preparation 7 Number of specimens 8 Conditioning 9 Procedure 9.1 Test atmosphere 9.2 Measurement of specimen cross-section 9.3 Clamping the specimen 9.4 Varying the temperature |
| 32 | 9.5 Performing the test 10 Expression of results 10.1 Symbols |
| 33 | 10.2 Calculation of the tensile storage modulus E′ 10.2.1 General 10.2.2 Avoidance of specimen resonance |
| 34 | 10.2.3 Correction for transducer resonance 10.2.4 Correction for apparatus compliance 10.2.5 Application of a length correction |
| 35 | 10.3 Calculation of the tensile loss factor tan δE 10.4 Calculation of the tensile loss modulus 10.5 Presentation of data as a function of temperature 11 Precision 12 Test report |
| 36 | Bibliography |
