High Cycle Fatigue

Fracture Surface

Failure Analysis

BWD Turbines team of experience personnel understand the failure and degradation modes of the high strength superalloys and TBC coating systems used in F and G class gas turbine engines.

This combined with our knowledge of engine design and component performance based on aero-thermodynamic analysis of the turbine stages, detailed component cooling channel flow & heat transfer analysis, and the resulting finite element models allow us to determine the failure mechanisms, identify their root causes and make specific recommendations that will prevent future occurrences.

Typical Approach / Work Scope

 Travel to the customer's site to establish the possible failure sequences, to select the failed components and to review all of the relevant operational data.

 Organize and present the possible causes in the form of a causation or fault tree diagram.

 Metallurgically analyze the components to identify failure modes, overload, high cycle fatigue, thermal mechanical fatigue, creep, environmentally assisted failure, etc.

 Use mechanical analysis and finite element analysis methods as required to evaluate the component for susceptibility to failure.

 Make recommendations to prevent future failures from occurring. Suggest changes to maintenance procedures, operating methods, repair intervals and component designs when relevant.

 Evaluate information from the OEM relating to the cause of the failure and recommend solutions to prevent re-occurrence.

 Provide an independent evaluation of the damaged components concerning repair / replace decisions.

 Evaluate the inspection and maintenance procedures during the rebuild of the engine especially concerning the NDE of the reusable components.

Campbell diagram for a last stage power turbine blade.

BWD Turbines Limited


Joe Daleo


Phone: (905) 648-9262












Service Detail

First Stage Bucket

Calculated temperature distribution.