BS ISO 22459:2020 pdf free.Fine ceramics (advanced ceramics, advanced technical ceramics) – Reinforcement of ceramic composites一- Determination of distribution of tensile strength and tensile strain to failure of filaments within a multifilament tow at ambient temperature.
BS ISO 22459 This document specifies the conditions for the determination of the distribution of strength and rupture strain of ceramic filaments within a multifilament tow at room temperature by performing a tensile test on a multifilament tow. This document applies to dry tows of continuous ceramic filaments that are assumed to act freely and independently under loading and exhibit linear elastic behaviour up to failure. The outputs of this method are not to be mixed up with the strengths of embedded tows determined by using ISO 240461).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 7500-1, Metallic materials – – Calibration and verification of static uniaxial testing machines一Part 1: Tension/compression testing machines一Calibration and verification of the force-measuring system ISO 10119, Carbon fibre一Determination of density EN 1007-2, Advanced technical ceramics一Ceramic composites一Methods of test for reinforcements一 Part 2: Determination of linear density.For the purposes of this document, the following terms and definitions apply. ISO and IEC maintain terminological databases for use in standardization at the following addresses: ISO Online browsing platform: available at https://www.iso.org/obp IEC Electropedia: available at http://www.electropedia.org/correction is not needed. The calculation of the results in Clause 10 also applies in this case by setting the load train compliance equal to zero.
The evaluation method is based on an analysis of the nonlinear domain of the force-displacement curve,which is caused by  ogressive filament failure during the test. The size of this domain is promoted by higher stiffness of the loading and gripping system. When the force-displacement curve does not show this nonlinear domain, the evaluation method of this document cannot be applied. The distribution of filament rupture strains does not depend on the initial number of filaments for those tows that contain a large number of filaments; hence, it is not affected by the number of filaments which are broken before the test, provided this number remains limited. The determination of the filament strength distribution requires knowledge of the initial cross-sectional area of the tow. The variation in filament diameters, which affects the strength values, is not accounted for. The Weibull parameters determined by this test method and extrapolated to the respective gauge length cannot be compared directly with those obtained from tensile tests on monofilaments according to ISO 19630 because of variability in test conditions.BS ISO 22459 pdf download.