| ISO: 6721 | Part: 8 | Published: 1997 | Contact: BSI |
| Title | Plastics - Determination of dynamic mechanical properties - Longitudinal and shear vibration - wave propagation method |
| Scope | This international standard specifies an ultrasoniv wave propagation method for determining the storage components of the longitudinal comples 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 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 standard. |
| Comment | The method allows measurements to be made on small specimens, typically 50mm x 20 mm x 5 mm, or small regions of larger specimens or sheets. It is therefore possible to obtain information on the homogeniety or anisotropy of modulus in a specimen. |
|
