EN 15157:2006

Foreword
1 Scope
2 Normative references
3 Terms, definitions and symbols
4 Principle
5 Significance and use
6 Apparatus
   6.1 Fatigue test machine
   6.2 Load train
   6.3 Set-up for heating
   6.4 Extensometer
   6.5 Temperature measurement
   6.6 Data recording system
   6.7 Micrometers
7 Test specimens
8 Test specimen preparation
   8.1 Machining and preparation
   8.2 Number of test specimens
9 Test procedure
   9.1 Test set-up: temperature considerations
   9.2 Measurement of test specimen dimensions
   9.3 Testing technique
   9.4 Test validity
10 Calculation of results
   10.1 Time to failure, t(f)
   10.2 Damage parameters
   10.3 Residual properties
11 Test report
Annex A (informative) Schematic evolution of E

This European Standard specifies the conditions for the determination of constant-amplitude of load or strain in uniaxial tension/tension or in uniaxial tension/compression cyclic fatigue properties of ceramic matrix composite materials (CMCs) with fibre reinforcement for temperature up to 1 700 °C in air at atmospheric pressure.

This European Standard applies to all ceramic matrix composites with fibre reinforcement, unidirectional (1D), bi-directional (2D), and tri-directional (xD, where 2 < x  3).

The purpose of this European Standard is to determine the behaviour of CMC when subjected to mechanical fatigue and oxidation simultaneously. Tests for the determination of fatigue properties at high temperature in inert atmospheres differ from those in oxidative atmospheres. Contrary to an inert atmosphere, damage in an oxidative atmosphere accumulates due to the influence of purely mechanical fatigue and to chemical effects of the material’s oxidation.