BS ISO 17167:2018,Fine ceramics (advanced ceramics, advanced technical ceramics) — Mechanical properties of monolithic ceramics at room temperature — Determination of flexural strength by the ring-on-ring test.
BS ISO 17167:2018 is applicable to materials with a grain size less than 100 µm.
Principle
A round discoidal test piece with a constant thickness is positioned between two concentric rings of different diameters and loaded by an axial force.
The nominal equibiaxial flexural strength is calculated from the axial force which acts during the moment of fracture, the geometry of the test piece and the test arrangement, as well as the Poissonratio of the test piece materia.
Significance and use
BS ISO 17167:2018 is intended to be used for material development and characterization, quality control and design data acquisition purposes. The strength level determined by the test is calculated on the basis of linear elastic bending behaviour of a round, disk-like thin plate on the assumption that the material being tested is elastically homogeneous and isotropic and shows a linear (Hooke) stressstrain behaviour.

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