The control of rapid and numerous temperature changes is an urgent requirement in many industrial processes, particularly for thermal power plants in flexible operation.

The paper describes objectives, partners and methodical approaches of the ongoing German research project THERRI.

The project scope is to establish essential Fracture Mechanics basics for an industrial application of a Damage Tolerance concept to thick-walled components of thermal power plants.

One key issue of the stipulated works is to provide an experimental data base for fatigue crack propagation in high-temperature ferritic-martensitic steels in the relevant temperature range from 300°C to 600°C. This will be supplemented by simulation calculations (XFEM) and the further development of ultrasonic measurement techniques.

The research project has been started but not finished yet. Therefore this paper is a snapshot of the ongoing project work and shows — besides the methodological work — first but not final results.

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