BS EN 843-1:2006

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Significance and use
5 Apparatus
  5.1 Test jig
  5.2 Test machine
  5.3 Micrometer or alternative calibrated device
  5.4 Travelling microscope
  5.5 Humidity measuring device
6 Test pieces
  6.1 General
  6.2 Dimensions and tolerances
  6.3 Surface finish
  6.4 Number of test pieces
  6.5 Precautions
7 Procedure
8 Calculations
9 Test report
Annex A (informative) Typical fracture patterns
        in ceramic test pieces
Bibliography

Describes methods for determining the nominal flexural strength of advanced monolithic technical ceramic materials at ambient temperature. The available loading geometries are three- and four-point flexure, using rectangular section test pieces of two prescribed geometries: 20 mm support span (A) and 40 mm support span (B).

This part of EN 843 specifies methods for determining the nominal flexural strength of advanced monolithic technical ceramic materials at ambient temperature. The available loading geometries are three- and four-point flexure, using rectangular section test pieces of two prescribed geometries: 20 mm support span (A) and 40 mm support span (B). NOTE This part of EN 843 differs from ISO 14704 (see Bibliography) in respect of span A (not included in the ISO version), the absence of the 30 mm span option, and the required use of a fully articulating test jig. The test applies to materials with grain size less than 200 µm. The test prescribes four categories of surface finish applied to the test pieces: I: as-fired or annealed after machining; II: standard finishing by grinding; III: standard finishing by lapping/polishing; IV: machined using agreed grinding procedures and material removal rates.