CEN/TS 15867:2009

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Principle
5 Apparatus
   5.1 Test machine
   5.2 Strain gauges
   5.3 Data recording system
   5.4 Micrometers
6 Reference test specimens
7 Reference test specimens preparation
   7.1 Adhesion of strain gauges
   7.2 Reference test specimen validity
8 Test procedure
   8.1 General
   8.2 Correction of the torsion defect
   8.3 Correction of the C defect
   8.4 Correction of the S defect
   8.5 Final verification before starting a series of
        measurements on CMCs
9 Test report
Bibliography

This document is a guide that describes a procedure:

to verify the degree of misalignment of the load train of the test machines using a reference test specimen uniformly loaded in tension or in compression;

to give indications in order to correct defects such as torsion and bending.

This document is not intended to provide a quantitative and acceptable limit, before the testing of ceramic matrix composites with a fibre reinforcement: unidirectional (1D), bidirectional (2D) and tridirectional (xD, with 2 < x  3) loaded along one principle axis of reinforcement. This limit depends on the sensitivity of each type of composite to the misalignment defect.

NOTE 1This limit is to be defined between the testing establishment and the customer.

NOTE 2Monolithic ceramics are very sensitive to misalignment defects, while CMCs (ceramic matrix composite) in general are moderately sensitive to them.