Standards Development

Scope

This part of EN 843 specifies methods for determining the elastic moduli, specifically Young’s modulus, shear modulus and Poisson’s ratio, of advanced monolithic technical ceramics at room temperature. This European Standard 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 flexure.

 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.

 C 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.

Purpose

As discussed at the last CEN/TC 184 Plenary meeting held on 2024-09-06 and as documented with Action 04/2024, EN 843-2 shall be revised. Preparatory work has been provided from the German mirror committee considering the comments received during the Systematic Review carried out in 2018, see draft attached.