ENV 13234 : 1998

1 Scope
2 Normative references
3 Principle
4 Significance and use
5 Definitions and symbols
      5.1 ligament
      5.2 notch depth, a
      5.3 notched specimen width, bn
      5.4 maximum tensile force, Fm
      5.5 unnotched specimen tensile strength, st,m
      5.6 notched specimen tensile strength, st,m,n
      5.7 equivalent fracture toughness Keq
6 Apparatus
      6.1 Test machine
      6.2 Load train
      6.3 Data recording system
      6.4 Micrometers
      6.5 Ligament size measuring device
7 Specimens
      7.1 Unnotched test specimens
      7.2 Notched test specimens
      7.3 Notches
8 Test specimen preparation
      8.1 Machining and preparation
      8.2 Number of test specimens
9 Test procedure
      9.1 Test on reference specimen
      9.2 Test on notched specimen
10 Calculation of results
      10.1 Test specimen origin
      10.2 Tensile strength of unnotched specimen
      10.3 Tensile strength of the notched specimen
      10.4 Plotting of notch sensitivity diagram
      10.5 Calculation of equivalent fracture toughness
             for the different classes of behaviour
11 Test report
Annex A (informative) Bibliography

Gives a method for classifying ceramic matrix composite (CMC) materials with respect to their sensitivity to crack propagation using tensile tests on notched specimens with different notch depths.