BS ISO 18610:2016 pdf download

BS ISO 18610:2016 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 an ultrasonic method to determine the components of the elasticity tensor of ceramic matrix composite materials at room temperature. Young’s moduli shear moduli and Poisson coefficients, can be determined from the components of the elasticity tensor.
This document applies to ceramic matrix composites with a continuous fibre reinforcement:unidirectional (1D), bidirectional (2D), and tridirectional (×D, with 2 < × ≤ 3) which have at least orthotropic symmetry, and whose material symmetry axes are known.
This method is applicable only when the ultrasonic wavelength used is larger than the thickness of the representative elementary volume, thus imposing an upper limit to the frequency range of the transducers used.
NOTE Properties obtained by this method might not be comparable with moduli obtained by ISO 15733,ISO 20504 and EN 12289.
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 3611, Geometrical product specifications (GPS) — Dimensional measuring equipment: Micrometers for external measurements — Design and metrological characteristics
ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories
EN 1389, Advanced technical ceramics — Ceramic composites — Physical properties — Determination of density and apparent porosity
3 Terms and definitions
For the purposes of this document, the terms and definitions given in CEN/TR 13233 and the following apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1 stress-strain
relations for orthotropic material elastic anisotropic behaviour of a solid homogeneous body described by the elasticity tensor of fourth order C ijkl , represented in the contracted notation by a symmetrical square matrix (6 × 6) Note 1 to entry: If the material has at least orthotropic symmetry, its elastic behaviour is fully characterized by nine independent stiffness components C ij , of the stiffness matrix (C ij ), which relates stresses to strains, or equivalently by nine independent compliance components S ij of the compliance matrix (S ij ), which relates strains to stresses. The stiffness and compliance matrices are the inverse of each other. If the reference coordinate system is chosen along the axes of symmetry, the stiffness matrix C ij and the compliance matrix