United States Department of Transportation
i
Probabilistic Integrity and Risk Assessment of Turbine Engines, Phase II
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2023-06-01
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[PDF-11.51 MB]
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Edition:Final Report September 2015 – May 2021
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Abstract:This grant supported the efforts of the Federal Aviation Administration (FAA) to develop an enhanced life management process, based on probabilistic damage tolerance principles, to address the threat of material or manufacturing anomalies in high-energy rotating components of aircraft engines. Major research products included formal verification and validation of Design Assessment of Reliability With INspection (DARWIN®) stress-intensity factor solutions; enhanced DARWIN capabilities for manual and automatic fracture mechanics modeling, probabilistic methods, and fleet risk methods. Substantial improvements in the speed and robustness of DARWIN for large finite element (FE) models; streamlined methods for deterministic life calculations; a DARWIN Python module to facilitate scripting of multiple DARWIN runs; options to specify or limit optional features or default values available in DARWIN; new advanced visualization capabilities enabling users to define and manipulate regions within three-dimensional FE models; multiple new versions of the DARWIN computer code for technology transfer to industry and the FAA, and a large DARWIN training workshop are also included. The efforts facilitate implementation of official advisory material for axial blade slots, titanium hard alpha anomalies, and circular holes, while also developing improved analysis methods for other applications of deterministic and probabilistic damage tolerance to engine safety.
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