Engine Titanium Consortium - Center for Nondestructive Evaluation ...

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The development and transfer of the software for POD/PFA curve generation will be considered successful if it is utilized by the members of ETC and the Rotor Integrity Subcommittee of AIA in life management decisions. Estimates of the POD of hard-alpha defects in sonic-shaped and final forging geometries will be provided to the FAA and members of the ETC and Rotor Integrity Subcommittee. These estimates will be judged adequate if they compare favorably with predictions of existing POD methodologies for inspection situations in which such POD values can be obtained and if they provide sensible predictions in cases in which the existing methodologies cannot do so. Major Accomplishments and Significant Interactions: Date June 14-15, 1999 September 16, 1999 Description Technical Kick-off Meeting in West Palm Beach, FL Workshop to detail the approach for POD for Forgings. Included review of first draft of white paper and assignment for preparation of chapters of the document. Publications and Presentations: Date Description Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 105
Project 3: Task 3.1: Subtask 3.1.3: Inspection Systems Capability Assessment and Validation POD Methodology Applications POD of Eddy Current Inspections in the Field Team Members: HW: GE: Dick Burkel, Jon Bartos, Shridhar Nath, Walt Bantz ISU: Bill Meeker, Norio Nakagawa, Bruce Thompson PW: Kevin Smith, Dave Raulerson, Taher Aljundi Students: none Program initiation date: June 15, 1999. All effort was stopped on March 17, 2000. Objectives: • To develop a new methodology for estimating the POD and PFA of eddy current (ET) inspections in the field which facilitates prediction of POD and PFA for specific changes in test parameters, surface conditions, material noise characteristics and feature geometries in a rapid fashion without the need to construct extensive specimen sets. • To validate that methodology by comparing its POD results to corresponding predictions of existing methodologies, such as the a-hat versus a model, when sufficient data exists to support that comparison. • To apply the methodology to the estimation of POD/PFA of inservice inspections of flat plates and slots. • To transfer the resulting software and procedures to the OEM’s for their use in life management calculations. Approach: As in the previous work on UT, the methodology will be based on the determination of the distributions of signal and of noise, with physical models of the measurement process being used to allow the maximum information to be obtained from limited experimental data. Special emphasis will be placed on the needs imposed by the development of field durability issues. The incorporation of physical models of the inspection adds flexibility and extensibility to the methodology, while reducing the cost. In general, physical models make parametric studies inexpensive, by repeated computations of output signals for a wide range of inspection parameters. The specific benefits of the models used in POD/PFA analyses are twofold: • The model-assisted POD/PFA estimation significantly reduces the specimen preparation, compared to a purely experiment-based POD estimate. The economic benefit is substantial for flat-surface geometry since only a handful of crack specimens are sufficient to provide normalization and model predictions can then cover a wide range of parameters. The benefit is even more substantial when complex geometries are considered because, without models, one Quarterly Report – January 1, 2002 –March 31, 2002 print date/time: 6/6/2002 - 8:39 AM – Page 106
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Engine Titanium Consortium Quarterl
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Project 1: Task 1.1: Subtask 1.1.1:
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findings for the first billet studi
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measured P(L) curve, and tabulate t
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1.2 1.0 0.8 V-DIE-A coupon "D" (axi
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Attenuation (dB/in) . Waspalloy Att
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Deliverables: Fundamental propertie
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Small Diameter Billet Assessment: A
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Under normal circumstances one woul
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Plans (April 1, 2002 - June 30, 200
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system will be at GE, and evaluatio
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fixed-focus transducers that were n
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Back-Wall Scan FBH scan 20% 57% 49%
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63% Back-Wall Scan 74% FBH scan 58%
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Figure 6. Noise and target amplitud
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Original Date Revised Date Descript
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(a) Transducer is: 15 MHz 0.5”-Di
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FOM (std. units) 0.20 0.18 0.16 0.1
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Peak> Range of Ave. Range of Peak G
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The average noise characteristics,
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Noise C-scans through the “Flat S
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4.0” Convex Block; Flat Side Insp
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% FSH Noise Measurements from flat
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Original Revised Description Status
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