DD ENV 843-2:1996 - Advanced technical ceramics. Monolithic ceramics. Mechanical properties at room temperature - Determination of elastic moduli
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This Part of EN 843 describes methods for determining the elastic moduli, specifically
Young's modulus, shear modulus and Poisson's ratio, of advanced monolithic technical
ceramics at room temperature. The prestandard prescribes four alternative methods for
determining some or all of these three parameters:
- A The determination of Young's modulus by static flexure of a thin beam in
three- or four-point bending.
-B The determination of Young's modulus by forced longitudinal resonance, or
Young's modulus, shear modulus and Poisson's ratio by forced flexural and
torsional resonance, of a thin beam.
с The determination of Young's modulus, shear modulus and Poisson's ratio
from the time-of-flight of an ultrasonic pulse.
D The determination of Young's modulus from the fundamental natural
frequency of a struck bar (impulse excitation method).
All the test methods assume the use of homogeneous test pieces of linear elastic
materials.
With the exception of Method C, the test assumes that the test piece has isotropic elastic
properties. Method C may be used to determine the degree of anisotropy by testing in
different orientations. At high porosity levels all of the methods may become
inappropriate. The maximum grain size (see EN 623-3), excluding deliberately added
whiskers, shall be less than 10% of the minimum dimension of the test piece.
