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BS EN ISO 6721-3:2021

BS EN ISO 6721-3:2021

$102.76

Plastics. Determination of dynamic mechanical properties – Flexural vibration. Resonance-curve method

Published By Publication Date Number of Pages
BSI 2021 20
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This document specifies a bending-vibration method based upon resonance curves for determining the flexural complex modulus of homogeneous plastics and the damping properties of laminated plastics intended for acoustic insulation, for example systems consisting of a metal sheet coated with a damping plastic layer, or sandwich systems consisting of two sheet-metal layers with an intermediate plastic layer. For many purposes, it is useful to determine these properties as a function of temperature and frequency.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 1 Scope
2 Normative reference
3 Terms and definitions
4 Principle
8 5 Test apparatus
5.1 General
5.2 Clamps or suspension fibres
5.3 Exciter and detector
9 5.4 Temperature-controlled enclosure
5.5 Gas supply
5.6 Temperature-measurement device
5.7 Devices for measuring test specimen dimensions
10 6 Test specimens
6.1 General
6.2 Shape and dimensions
6.3 Preparation
7 Number of test specimens
11 8 Conditioning
9 Procedure
9.1 Test atmosphere
9.2 Measurement of specimen cross-section
9.3 Measurement of specimen density
9.4 Mounting the test specimens and adjustment of the transducers
9.4.1 Method A
9.4.2 Method B
9.4.3 Adjustment of the transducers
9.5 Varying the temperature
12 9.6 Varying the frequency
9.7 Recording the resonance curve
10 Expression of results
10.1 Symbols
13 10.2 Calculation of flexural storage modulus, E’f
10.3 Calculation of flexural loss factor, tan δf
10.4 Calculation of flexural loss modulus, E”f
10.5 Plotting the complex modulus as a function of temperature
14 11 Precision
11.1 Storage modulus
11.2 Loss factor
11.3 Precision of the methods
12 Test report
15 Annex A (informative) Interlaboratory testing
18 Bibliography

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BS EN ISO 6721-3:2021
$102.76