Prestandardization aspects of the uniaxial mechanical testing of ceramics
Uniaxial, tensile type testing is increasingly preferred over flexure testing to measure mechanical property data on ceramics. In order for the test result to be valid, the bending component of the stress field must remain within the limits beyond which it would obscure the intrinsic material property being measured. This requires optimal alignment of the loading train, grip and specimen assembly. Inadequate procedures to characterise the alignment of uniaxial testing systems, proposed for ceramics testing, are commonly applied in the literature. It is recommended that the alignment performance of a loading train and grip assembly should be characterised by means of the maximum level of bending operating along the gauge length of a uniaxial specimen, preferably expressed in terms of the precision of alignment. Arguments to support this recommendation and the correct procedure for measuring and reporting bending levels are presented. The arguments are illustrated by means of experimental results achieved on two loading and gripping systems which are conceived for the uniaxial testing of ceramics in tension/creep and in cyclic tension/compression up to temperatures of 1500 C.
Bibliographic Reference: Paper presented: Harmonization of Testing Practice for High Temperature Materials, Travedona Monate (IT), Oct. 18-19, 1990
Availability: Available from (1) as Paper EN 35753 ORA
Record Number: 199011584 / Last updated on: 1994-12-02
Original language: en
Available languages: en