All measurements include the observation of crack propagation with the help of an optical microscope as well as pictures of the crack tip and the crack flanks.
- Measurement of the R-curve in compact specimens, thickness 3mm, dimensions: 35mm x 33,6mm or 50mm x 48mm according to ASTM E-399. Determination of 8 – 15 data points, thereby at least two samples are required.
- Measurement of the R-curve according to the SEVNB-method (two samples).
- Measurement of the R-curve according to the SCF-method (two samples).