DD ENV 12789:1998

Contents
National foreword
Foreword
1. Scope
2. Normative references
3. Principle
4. Definitions and symbols
    4.1 Test temperature, T
    4.2 Maximum flexural force, FM
    4.3 Flexural stress, O
    4.4 Flexural strength, OF,M
5. Apparatus
    5.1 Test machine
    5.2 Test Jig
    5.3 Set-up for heating
    5.4 Temperature measurement
    5.5 Data recording system
    5.6 Micrometers
6. Test specimens
7. Test specimen preparation
    7.1 Machining and preparation
    7.2 Number of test specimens
8. Test procedures
    8.1 Test set-up: Temperature considerations
    8.2 Test set-up: Other considerations
    8.3 Testing technique
    8.4 Test validity
9. Calculation of results
    9.1 Test specimen origin
    9.2 Flexural strength
10. Test report

Gives the conditions to determine the flexural strength of ceramic matrix composite materials with continuous fibre reinforcement under three-point or four-point bending for temperatures up to 1 700 Deg C in air at atmospheric pressure. Applicable to all ceramic matrix composites with a continuous fibre reinforcement, unidirectional (1D), bidirectional (2D), and tridirectional (xD, with 2 less than x less than or equal to 3), loaded along one principal axis of reinforcement.