DD ENV 14186:2002

Foreword
1 Scope
2 Normative references
3 Principle
4 Significance and use
5 Terms and definitions and symbol
6 Apparatus
   6.1 Ultrasonic tank with thermostatic control
   6.2 Temperature measurement device
   6.3 Test specimen holder
   6.4 Transducers
   6.5 Transducer holders
   6.6 Pulse generator
   6.7 Signal recording system
7 Test specimens
8 Test specimen preparation
9 Test procedure
   9.1 Choice of frequency
   9.2 Establishment of the test temperature
   9.3 Reference test without test specimen
   9.4 Measurement with the specimen
        9.4.1 Measurement of the bulk density and of the
               thickness
        9.4.2 Mounting of the specimen
        9.4.3 Acquisition of different angles of incidence
10 Calculation
   10.1 Delay
   10.2 Calculation of the propagation velocities
   10.3 Calculation of the refracted angle theta[r]
   10.4 Identification of the elastic constants C[ij]
        10.4.1 Basic considerations
        10.4.2 Calculation of C[33]
        10.4.3 Calculation of C[22], C[23] and C[44]
        10.4.5 Calculation of C[12] and C[66]
   10.5 Back calculation of the phase velocities
   10.6 Polar plots of the velocity curves
   10.7 Calculation of the quadratic deviation
   10.8 Calculation of the engineering constants
11 Test validity
   11.1 Measurements
   11.2 Criterion of validity for the reliability of the
        C[ij] components
12 Test report
Annex A (informative) Example of a presentation of the results
        for a material with orthothropic symmetry
Bibliography

Defines an ultrasonic method to determine the components of the elasticity tensor of ceramic matrix composite materials at room temperature. Applicable to ceramic matrix composites with a continuous fibre reinforcement: unidirectional (1D), bidirectional (2D), and tridirectional (xD with 2< x <=3) which have at least orthotropic symmetry, and whose material symmetry axes are known.