BS ISO 6721-8:2019
$102.76
Plastics. Determination of dynamic mechanical properties – Longitudinal and shear vibration. Wave-propagation method
| Published By | Publication Date | Number of Pages |
| BSI | 2019 | 18 |
This document describes an ultrasonic wave propagation method for determining the storage components of the longitudinal complex modulus L* and the shear complex modulus G* of polymers at discrete frequencies typically in the range 0,5 MHz to 5 MHz. The method is suitable for measuring materials with storage moduli in the range 0,01 GPa to 200 GPa and with loss factors below 0,1 at around 1 MHz. With materials that have a higher loss, significant errors in velocity measurement are introduced through waveform distortion and can only be reduced using procedures that are outside the scope of this document.
The method allows measurements to be made on small specimens, typically 50 mm × 20 mm × 5 mm, or small regions of larger specimens or sheets. It is therefore possible to obtain information on the homogeneity or anisotropy (see 10.5) of modulus in a specimen.
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 2 | National foreword |
| 6 | Foreword |
| 7 | 1 Scope 2 Normative references 3 Terms and definitions |
| 8 | 4 Principle 5 Testing device 5.1 Apparatus |
| 9 | 5.1.1 Method A: Immersion method 5.1.2 Method B: Transducer contact method 5.2 Transducers 5.3 Transit-time measurement equipment |
| 10 | 5.4 Temperature measurement and control 6 Test specimens 6.1 General 6.2 Shape and dimensions 6.3 Preparation 7 Number of specimens 8 Conditioning 9 Procedure 9.1 Test atmosphere |
| 11 | 9.2 Measuring the specimen dimension 9.3 Performing the test 9.3.1 Method A: Immersion method 9.3.2 Method B: Transducer contact method |
| 12 | 9.3.3 Measurement of the specimen density 9.4 Varying the temperature 10 Expression of the results 10.1 Symbols 10.2 Determination of the longitudinal wave velocity vL 10.2.1 Method A: Immersion method |
| 13 | 10.2.2 Method B: Transducer contact method 10.3 Determination of the transverse wave velocity vT 10.3.1 Method A: Immersion method |
| 14 | 10.3.2 Method B: Transducer contact method 10.4 Calculation of dynamic properties 10.5 Influence of material anisotropy |
| 15 | 11 Precision 12 Test report |
