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BS EN ISO 20323:2021

BS EN ISO 20323:2021

$167.15

Fine ceramics (advanced ceramics, advanced technical ceramics). Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure. Determination of tensile properties of tubes

Published By Publication Date Number of Pages
BSI 2021 38
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This document specifies the conditions for the determination of tensile properties of ceramic matrix composite tubes with continuous fibre-reinforcement at ambient temperature in air atmospheric pressure. This document is specific to the tubular geometries since fibre architecture and specimen geometry factors are distinctly different in composite tubes than in flat specimens.

This document provides information on the uniaxial tensile properties and tensile stress-strain response such as tensile strength and strain, tensile elastic modulus and Poissonā€™s ratio. The information may be used for material development, control of manufacturing (quality insurance), material comparison, characterization, reliability and design data generation for tubular components.

This document addresses, but is not restricted to, various suggested test piece fabrication methods. It applies primarily to ceramic and/or glass matrix composite tubes with a continuous fibrous-reinforcement: unidirectional (1D filament winding and tape lay-up), bi-directional (2D braid and weave) and tri-directional (xD, with 2 < x < 3), loaded along the tube axis.

Values expressed in this document are in accordance with the International System of Units (SI).

NOTE In most cases, ceramic matrix composites to be used at high temperature in air are coated with an antioxidation coating.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
7 Foreword
9 1 Scope
2 Normative references
3 Terms and definitions
12 4 Principle
5 Apparatus
13 5.4.1 General
5.4.2 Extensometers
14 5.4.3 Strain gauges
5.4.4 Digital image correlation
15 5.5 Data recording system.
5.6 Dimensions measurement.
16 6 Tubular test specimens
6.1 Specimen specifications
6.1.1 General
6.1.2 Dimension
6.1.3 Geometry
17 6.1.4 Tolerances and variability
6.2 Specimen preparation
6.2.1 General
18 6.2.2 As-fabricated
6.2.3 Application-matched machining
6.2.4 Customary practices
6.2.5 Standard procedure
6.3 End collars
20 6.4 Test count and test specimens sampling
7 Test procedure
7.1 General
7.2 Test mode and rates
21 7.3 Testing technique
7.3.1 Measurement of test specimen dimensions
7.3.2 Instrumentation of test specimen
7.3.3 Test specimen mounting
7.3.4 Setting-up of strain measurement means
22 7.3.5 Measurements
23 7.3.6 Post-test analyses
7.4 Test validity
8 Calculation of results
8.1 Test specimen origin
24 8.2 Engineering stress and strain
25 8.3 Tensile strength
8.4 Strain at maximum tensile force
26 8.5 Proportionality ratio or pseudo-elastic modulus, elastic modulus
8.5.1 Stress-strain curves with a linear region
27 8.5.2 Nonlinear stress-strain curves
8.6 Poissonā€™s ratio (optional)
8.7 Statistics
28 9 Test report
9.1 General
9.2 Testing information
9.3 Test specimen and material
29 9.4 Equipment and test parameters
9.5 Test results
30 Annex A (informative) Gripping devices and load train couplers
35 Annex B (informative) Test specimen geometries
36 Bibliography

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BS EN ISO 20323:2021
$167.15