BS ISO 20323:2018 pdf download

BS ISO 20323:2018 pdf download

BS ISO 20323:2018 pdf download.Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure
1 Scope
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 Poisson’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.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 20507, Fine ceramics (advanced ceramics, advanced technical ceramics) — Vocabulary
ISO 7500-1, Metallic materials — Calibration and verification of static uniaxial testing machines — Part 1:Tension/compression testing machines — Calibration and verification of the force-measuring system
ISO 17161, Fine ceramics (advanced ceramics, advanced technical ceramics) — Ceramic composites —Determination of the degree of misalignment in uniaxial mechanical tests
ISO 9513, Metallic materials — Calibration of extensometer systems used in uniaxial testing
ISO 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for external measurements — Design and metrological characteristics
ASTM E2208-02, Standard Guide for Evaluating Non-Contacting Optical Strain Measurement Systems
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 20507 and the following apply.
4 Principle
A prepared tubular test specimen of specified dimensions is loaded in monotonic uniaxial tension up to fracture. The test is performed at constant cross-head displacement, or constant strain ([or constant loading rate]. Both the applied force and resulting longitudinal strain are measured and recorded simultaneously. The uniaxial tensile strength and strain are determined from the maximum applied force, while the various other tensile properties are determined from the stress-strain response data. Generally, the test is carried out under conditions of ambient temperature and environment. NOTE1 In uniaxial loading, the force is applied parallel to the tube axis. Monotonic refers to a continuous nonstop test rate with no reversals from test initiation to final fracture. NOTE2 The use of constant loading rate only gives a valid tensile curve when the behaviour is linear up to failure.