BS ISO 6721-6:2019
$102.76
Plastics. Determination of dynamic mechanical properties – Shear vibration. Non-resonance method
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 18 |
This document describes a forced, non-resonance method for determining the components of the shear complex modulus G* 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 0,1 MPa to 50 MPa.
Although materials with moduli greater than 50 MPa can be studied, more accurate measurements of their dynamic shear properties can be made using a torsional mode of deformation (see ISO 6721-2 and ISO 6721-7).
This method is particularly suited to the measurement of loss factors greater than 0,02 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 |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions 4 Principle |
| 8 | 5 Apparatus 5.1 Loading assembly 5.1.1 General 5.1.2 Load stage 5.1.3 Transducers |
| 9 | 5.2 Electronic data-processing equipment 5.3 Temperature measurement and control 5.4 Devices for measuring test specimen dimensions 6 Test specimens 6.1 General 6.2 Shape and dimensions 6.3 Preparation of polymer specimens 7 Number of test specimens 8 Conditioning |
| 10 | 9 Procedure 9.1 Test atmosphere 9.2 Measuring the cross-section of the polymer specimen 9.3 Clamping the test assembly 9.4 Varying the temperature 9.5 Performing the test 10 Expression of results 10.1 Symbols |
| 11 | 10.2 Calculation of the shear storage modulus G′ 10.2.1 General |
| 12 | 10.2.2 Avoidance of test assembly resonance 10.2.3 Correction for transducer resonance 10.2.4 Correction for apparatus compliance |
| 13 | 10.3 Calculation of the shear loss factor tan δG 10.4 Calculation of the shear loss modulus 10.5 Presentation of data as a function of temperature 11 Precision 12 Test report |
| 16 | Bibliography |
