Community Research and Development Information Service - CORDIS


THERFAT Report Summary

Project ID: FIKS-CT-2001-00158
Funded under: FP5-EAECTP C
Country: Finland

Integrity evaluation

The "integrity evaluation" is based on the thermal spectrum loads determined by the experimental and numerical results deduced in THERFAT. Different integrity evaluation procedures concerning the assessment of stresses, fatigue usage, crack initiation and crack propagation issues for components or specimen subjected to cyclic thermal loads has been executed. Code and standard procedures and more refined analysis models have been applied for more accurate predictions about the influence of the degradation mechanisms. Assigned partners used the load determination input from experiments and numerical analyses to evaluate stresses/fatigue usage, crack initiation and crack propagation ("forward integrity evaluation approach"). Other partners already performed stress/fatigue usage, crack initiation and crack propagation analyses bases on so-called damage tests to predict and to verify the experimental results.

The results of the integrity evaluation demonstrate the feasibility of the introduced integrity evaluation procedures. Code evaluation methods and other common approaches are appropriate to deal with the fatigue related issues. This applies for the stress calculation with provided thermal spectrum loads (from experimental tests and in a smaller scale from CFD-analyses or from damage tests) and for the related fatigue evaluation. For the fracture mechanics assessments (crack initiation and crack propagation) common approaches based on elastic material behaviour have been confirmed as suitable. More sophisticated approaches, e.g. using elastic/plastic material laws are available for safeguarding reasons, if appropriate. As conclusion can be stated that effective simplified and more sophisticated engineering tools are available to deal with high cyclic turbulent loads.

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