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Reliability of Steam Turbine Rotors Task 1:Lifetime Prediction Analysis System

机译:汽轮机转子的可靠性任务1:寿命预测分析系统

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Task 1 of RP 502, "Reliability of Steam Turbine Rotors," resulted in the develop¬ment of a computerized lifetime prediction analysis system (STRAP) for the auto¬matic evaluation of rotor integrity based upon the results of a boresonic examina¬tion of near-bore defects. Concurrently an advanced boresonic examination system (TREES), designed to acquire data automatically for lifetime analysis, was developed and delivered to the maintenance shop of a major utility. This system and a semi-automated, state-of-the-art system (BUCS) were evaluated on two retired rotors as part of the Task 2 effort.nA modified nonproprietary version of STRAP, called SAFER, is now available for rotor lifetime prediction analysis. STRAP and SAFER share a common fracture analysis postprocessor for rapid evaluation of either conventional boresonic amplitude data or TREES cell data. The final version of this postprocessor contains general stress intensity correlations for elliptical cracks in a radial stress gradient and provision for elastic-plastic instability of the ligament between an imbedded crack and the bore surface. Both linear elastic and ligament rupture models were devel¬oped for rapid analysis of linkup within three-dimensional clusters of defects.

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