Standards Development

Scope

This document describes test methods for determining the dynamic elastic moduli, specifically Young’s modulus, shear modulus and Poisson’s ratio, of fine ceramics at room temperature. This standard prescribes two alternative methods :

A The determination of moduli by forced sonic resonance of a slender beam ;

B The determination of moduli from the fundamental natural frequencies of a struck slender beam (impulse excitation technique - IET).

Both test methods assume the use of test pieces of homogeneous, isotropic and linear elastic materials[3]

NOTE 1 Not all ceramic materials are equally and linearly elastic in tension and compression, such as some porous materials, and some piezoelectric materials.

NOTE 2 At high porosity levels these methods may become inappropriate.

NOTE 3 The maximum grain size (see ISO13383-1), excluding deliberately added whiskers, should be less than 10 % of the minimum dimension of the test piece.

NOTE 4 The merits of the two methods described in the present document have been addressed in a European round-robin comparing four methods for the determination of the elastic moduli of monolithic ceramics at room temperature. The results of this exercise are provided in the informative Annex B (see also reference [3]).