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 of reinforcement.
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 3611:2010, Geometrical product specfications (GPS)一Dimensional measuring equipment: Micrometers for external measurements – – Design and metrological characteristics
ISO 7500-1:2004, Metallic materials 一Verification of static uniaxial testing machines 一Part 1:Tension/compression testing machines一. Verification and calibration of the force-measuring system ISO/DIS 15733, Fine ceramics (advanced ceramics, advanced technical ceramics) -Mechanical properties of ceramic composites at ambient temperature in air atmospheric pressure – determination of tensile properties
3 Principle
Tensile tests are carried out on double edge notched test specimens with notches of different depths.
The results of these tests are compared with the results of tensile tests on specimens without notches.The cross sectional dimensions of the notched specimens between the notches are equal to those of the un-notched specimens.
Thestrength values observed on bothtypes ofspecimens as a function of notch depth alow the determination of the range of notch size for which the tested composite is sensitive to the presence of notches.ISO/DIS 18608 pdf free download.
Tags: Fine ceramics
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