ISO/DIS 14704-2015 pdf free.Fine ceramics [advanced ceramics, advanced technical ceramics)一Test method for flexural strength of monolithic ceramics at room temperature. ISO/DIS 14704 specifies a test method for determining the flexural strength of monolithic fine ceramics, and whisker- or particulate-reinforced ceramic composites, at room temperature and applies to materials with grain size less than 200 pm. This test method may be used for materials development, quality control, characterization and design data-generation purposes. NOTE Since fracture is due to tense stress, flexural strength data can be used to calculate a uniaxial tensile strength considering the effect of the tested volume and Weibull-statistics. So, flexural strength is often used in substitute for uniaxial tensile strength. 2 Normative references The following referenced documents are indispensable for the application 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 3611:1978. Micrometer callipers for external measurement ISO 7500-1:2004. Metallic materials — Verification of static uniaxia( testing machines — Part 1: Tension/compression testing machines — Verification and calibration of the force-measuring system 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. flexural strength maximum…

ISO/DIS 18608-2015 pdf free.Fine ceramics (advanced ceramics, advanced technical ceramics) – Mechanical properties of ceramic composites at ambient temperature一Evaluation of the resistance to crack propagation by notch sensitivity testing. ISO/DIS 18608 describes a method for the classification of ceramic matrix composite (CMC) materials with respect to their sensitivity to crack propagation using tensile tests on notched specimens with different notch depths. Two classes of ceramic matrix composite materials can be distinguished: materials whose strength is sensitive to the presence of notches and materials whose strength is not affected. For sensitive materials, this International Standard defines a method for determining equivalent fracture toughness. The parameter, Keq, is defined as the fracture toughness of a homogeneous material which presents the same sensitivity to crack propagation as the ceramic matrix composite material which is being considered. The definition of the Keq parameter offers the possibility to compare ceramic matrix composite materials with other materials with respect to sensitivity to crack propagation.For notch insensitive materials, the concept of Keq does not apply. This International Standard applies to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1 D)], bidirectional (2 D)], and tridirectional (x D, where 2 <x≤3), loaded along one principal axis…

ISO 21618-2019 pdf free.Fine ceramics (advanced ceramics,advanced technical ceramics)-Test method for fracture resistance of monolithic ceramics at room temperature by indentation fracture (IF) method. This document describes a test method that covers the determination of fracture resistance of monolithic ceramics at room temperature by the indentation fracture (IF) method. This document is intended for use with dense monolithic ceramics and whisker- or particulate- reinforced ceramics which are regarded as macroscopically homogeneous. It does not include monolithic silicon nitride ceramics for bearing balls and continuous-fibre-reinforced ceramics composites. This document is for material development, material comparison, quality assurance, characterization and reliability data generation. Indentation fracture resistance, KI,IFR, as defined in this document is not to be equated with fracture toughness determined using other test methods such as Ki5 and KIpb. NOTE KI,IFR is an estimate of a material’s resistance to cracking as introduced by an indenter and has correlations with wear resistance and rolling contact fatigue performance as well as machining processes, since these properties are governed by the resistance to crack extension in localized damage areaslll-(J. By contrast, fracture toughness properties Ki and KIpb are intrinsic properties of a material and are relevant to macroscopic and catastrophic fracture events with long…