Résumé
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.
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Informations générales
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État actuel: PubliéeDate de publication: 2019-04Stade: Norme internationale en cours d'examen systématique [90.20]
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Edition: 2
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Comité technique :ISO/TC 61/SC 5ICS :83.080.01
- RSS mises à jour
Cycle de vie
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Précédemment
AnnuléeISO 6721-8:1997
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Actuellement
PubliéeISO 6721-8:2019
Les normes ISO sont réexaminées tous les cinq ans
Stade: 90.20 (En cours d'examen)
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