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BS EN ISO 6721-3:2021 – TC

BS EN ISO 6721-3:2021 – TC

$134.27

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

Published By Publication Date Number of Pages
BSI 2021 50
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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
32 National foreword
34 European foreword
36 Foreword
37 1 Scope
2 Normative reference
3 Terms and definitions
4 Principle
38 5 Test apparatus
5.1 General
5.2 Clamps or suspension fibres
5.3 Exciter and detector
39 5.4 Temperature-controlled enclosure
5.5 Gas supply
5.6 Temperature-measurement device
5.7 Devices for measuring test specimen dimensions
40 6 Test specimens
6.1 General
6.2 Shape and dimensions
6.3 Preparation
7 Number of test specimens
41 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
42 9.6 Varying the frequency
9.7 Recording the resonance curve
10 Expression of results
10.1 Symbols
43 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
44 11 Precision
11.1 Storage modulus
11.2 Loss factor
11.3 Precision of the methods
12 Test report
45 Annex A (informative) Interlaboratory testing
48 Bibliography

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BS EN ISO 6721-3:2021 - TC
$134.27