Workflow for the structural integrity assessment of turbine disks
Source: BAM, Division Weld Mechanics
Aero-engine turbine disks are safety-relevant components which are operated under high thermal and mechanical stress conditions. The current part qualification and certification procedures make use of spin-tests conducted on production-similar disks. While these tests provide, on the one hand, a reliable definition of the critical conditions for real components, on the other hand they represent a relevant cost item for engine manufacturers.
The aim of this work is to present two alternative burst speed assessment methods under development based on the Failure Assessment Diagram (FAD) and a global stability criterion, respectively. In the scope of the fracture mechanics assessment, the failure at the diaphragm as well as at the bore of the turbine disk are investigated, respectively, with semi-circular surface cracks modelled at these critical regions. The comparison of the predicted critical rotational speed shows good agreement between the assessment methods.
Burst speed assessment of aero-engine turbine disk based on failure assessment diagram and global stability criterion
Jiangchao Zhu, Mauro Madia, Michael Schurig, Bernard Fedelich, Hartmut Schlums, Uwe Zerbst
Published in Engineering Fracture Mechanics, 2023, Volume 15, Article number 109005, Pages 1-15