ISO 6721-8:2019

Plastics — Determination of dynamic mechanical properties — Part 8: Longitudinal and shear vibration — Wave-propagation method

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.

Plastiques — Détermination des propriétés mécaniques dynamiques — Partie 8: Vibrations longitudinale et en cisaillement — Méthode de propagation des ondes

General Information

• Status: Published
• Publication Date: 10-Apr-2019
• ICS: 83.080.01 - Plastics in general
• Technical Committee: ISO/TC 61/SC 5 - Physical-chemical properties
• Drafting Committee: ISO/TC 61/SC 5/WG 8 - Thermal analysis
• Current Stage: 9020 - International Standard under periodical review
• Start Date: 15-Jan-2024
• Completion Date: 15-Jan-2024

Relations

• Revises: ISO 6721-8:1997 - Plastics — Determination of dynamic mechanical properties — Part 8: Longitudinal and shear vibration — Wave-propagation method
• Effective Date: 15-Dec-2017

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 6721-8
Second edition
2019-04
Plastics — Determination of dynamic
mechanical properties —
Part 8:
Longitudinal and shear vibration —
Wave-propagation method
Plastiques — Détermination des propriétés mécaniques
dynamiques —
Partie 8: Vibrations longitudinale et en cisaillement — Méthode de
propagation des ondes
Reference number
ISO 6721-8:2019(E)
©
ISO 2019

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ISO 6721-8:2019(E)

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ii © ISO 2019 – All rights reserved

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ISO 6721-8:2019(E)

Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 2
5 Testing device . 2
5.1 Apparatus . 2
5.1.1 Method A: Immersion method . 3
5.1.2 Method B: Transducer contact method . 3
5.2 Transducers . 3
5.3 Transit-time measurement equipment . 3
5.4 Temperature measurement and control . 4
6 Test specimens. 4
6.1 General . 4
6.2 Shape and dimensions . 4
6.3 Preparation . 4
7 Number of specimens . 4
8 Conditioning . 4
9 Procedure.
...