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BWD TURBINES LIMITED |
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ADVANCED TURBINE TECHNOLOGIES FOR THE INDUSTRY WORLDWIDE |
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High Cycle Fatigue Fracture Surface |
Failure Analysis |
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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. |
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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. |
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Campbell diagram for a last stage power turbine blade. |
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Service Detail |
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First Stage Bucket Calculated temperature distribution. |