PREN 843-6 : DRAFT 2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
  3.1 General terms
  3.2 Terms classifying inherently volume-distributed
       fracture origins
  3.3 Terms classifying inherently surface-distributed
       fracture origins
  3.4 Terms classifying features on fracture surfaces
4 Significance and use
5 Apparatus
  5.1 Preparation and cleaning facilities
  5.2 Observational facilities
6 Recommended procedure
  6.1 Outline
  6.2 Specimen storage and cleaning of fracture surfaces
  6.3 Visual inspection
  6.4 Optical microscope examination
  6.5 Identification of major fracture surface features
  6.6 Scanning electron microscope examination
  6.7 Identification of fracture origin
  6.8 Identification of chemical inhomogeneity at fracture
       origin
  6.9 Drawing conclusions
7 Report
Annex A (informative) - Crack patterns in ceramic bodies
Annex B (informative) - Examples of general features of fracture
        surfaces
Annex C (informative) - Examples of procedure for fracture origin
        identification
  C.1 Single large pores
  C.2 Agglomerates
  C.3 Large grains
  C.4 Compositional inhomogeneities
  C.5 Delaminations
  C.6 Handling damage
  C.7 Machining damage
  C.8 Oxidation pitting
  C.9 Complex origins
  C.10 No obvious origins
Annex D (informative) - Use of fracture mechanical information to
        aid fractography
  D.1 Fracture stress and origin size
  D.2 Fracture stress and fracture mirror size
Annex E (informative) - Example layout of reporting pro-forma
Bibliography

Provides guidelines to be adopted when evaluating the appearance of the fracture surface of an advanced technical ceramic.