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BS EN ISO 21765:2021

$142.49

Textiles. Determination of fabric deformability by forced mechanical distension

Published By Publication Date Number of Pages
BSI 2021 28
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This document specifies a method for the automatic determination of the deformability of textile fabrics, including continuous-fibre reinforcement textiles. This method is not applicable to resin impregnated fabrics.

The method is suitable for use with fabrics such as woven or knitted fabrics, nonwovens, non-crimp fabrics, fabrics made of glass rovings or untwisted carbon filament yarns intended for reinforced composite materials. When applying the method to multi-axial non-crimp fabrics, the evaluation of the fibre orientation and gaps only incorporates the uppermost layer.

The method can be used for fabrics treated with powder binder.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
7 Foreword
8 Introduction
9 1 Scope
2 Normative references
3 Terms and definitions
11 4 Principle
5 Apparatus
5.2 Deformability test apparatus
13 6 Test specimen
14 7 Procedure
7.1 Inserting the test specimen
7.2 Specifications of the test
7.2.1 Test parameters
7.2.2 Evaluation parameters
15 7.3 Test procedure
8 Calculation and specification of the results
8.1 Non-crimp fabric
8.1.1 General
16 8.1.2 Deformation force
8.1.3 Gap width
8.1.4 Gap portion
8.1.5 Gap shape
8.1.6 Fibre-angle change
17 8.1.7 Undulation
8.1.8 Loop formation
8.1.9 Waviness
8.1.10 Out-of-roundness
8.2 Woven fabrics
8.2.1 Characteristic value names, symbols and units
18 8.2.2 Deformation force
8.2.3 Gap portion
8.2.4 Gap area
8.2.5 Gap shape
8.2.6 Fibre-angle change
8.2.7 Undulation
8.2.8 Shearing angle
8.2.9 Waviness
19 8.2.10 Out-of-roundness
8.2.11 Residual deformation
8.3 Knitted fabrics
8.3.1 Table with characteristic value names, symbols and units
8.3.2 Deformation force
8.3.3 Gap portion
8.3.4 Gap area
8.3.5 Gap shape
20 8.3.6 Waviness
8.3.7 Out-of-roundness
8.3.8 Residual deformation
8.4 Nonwovens
8.4.1 Table with characteristic value names, symbols and units
8.4.2 Deformation force
8.4.3 Anisotropy
21 8.4.4 Thinning-out
8.4.5 Waviness
8.4.6 Out-of-roundness
8.4.7 Residual deformation
8.5 Evaluation
22 9 Test report
24 Annex A (informative) Example images
26 Annex B (informative) Statistical data
27 Bibliography
BS EN ISO 21765:2021
$142.49