Probabilistic Surface Damage Tolerance Assessment of Aircraft Turbine Rotors

Enright, Michael P.; Lee, Yi Der; McClung, R. Craig; Huyse, Luc; Leverant, G. R.; Millwater, Harry; Fitch, S.H.

doi:10.1115/gt2003-38731

Cited by 21 publications

(13 citation statements)

References 11 publications

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“…For a typical gas turbine engine disk, the number of features associated with a surface damage assessment is relatively small compared to the number of zones associated with an inherent defect-based assessment. Stress and temperature data, typically defined only at key features, can be defined directly by the analyst (i.e., no finite element results are required, Enright et al 2003).…”

Section: Strategy For Surface Damage-based Defectsmentioning

confidence: 99%

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Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Enright

Huyse

McClung

et al. 2004

Engineering, Construction, and Operations in Challenging Environments

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The presence of rare metallurgical or manufacturing anomalies in aircraft turbine rotors/disks may contribute to uncontained engine failures. A probabilistic methodology has been developed to quantify the risk of fracture and the influence of periodic inspection on overall risk, supplementing the current safe life approach. This paper summarizes the methodology and computational implementation, including a brief description of a new method for defining surface damage-related crack growth using 3D finite element results. The results can be applied to risk assessment of aerospace structures where uncertainties associated with fatigue crack growth must be quantitatively addressed.

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Section: Strategy For Surface Damage-based Defectsmentioning

confidence: 99%

“…This illustrates the applicability of the method to nonaxisymmetric geometries for probabilistic life prediction of general aerospace components. See Enright et al 2003 for additional details regarding the probabilistic surface damage tolerance strategy.…”

Section: Strategy For Surface Damage-based Defectsmentioning

confidence: 99%

Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Enright

Huyse

McClung

et al. 2004

Engineering, Construction, and Operations in Challenging Environments

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“…The probabilistically-based damage tolerance software code DARWIN' (Design Assessment of Reliability With INspection) has been described elsewhere and is only briefly outlined here [2][3][4]. DARWIN' has been developed to supplement the current safe-life approach for low-cycle fatigue design of titanium disks/rotors in commercial aircraft gas turbine engines.…”

Section: Probabilistic Fracture Mechanics Application Examplementioning

confidence: 99%

Application of an XML-based Database for Probabilistic Analysis

Millwater¹,

Fitch²,

Enright³

et al. 2003

44th AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference

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The Extensible Markup Language, XML, is used as database file format for a probabilistic fracture mechanics program, DARWIN ™ , which is used for risk assessment of commercial aircraft engine rotors. The database is used for storage and retrieval of probabilistic results during computations, for transferring data from the computational code to the graphical user interface, generating HTML output reports, and for archiving the results. The advantages of using an XML database file format are discussed through an application example.

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“…The methodology has been extended to surface damage, that is, damage induced during manufacturing, by addressing stress gradient modeling issues prevalent at the part surface and developing the requisite weight function stress intensity factor solutions [14]. The methodology and software have also been extended to materials with potentially highfrequency inherent anomalies such as in powder nickel by considering the potential for multiple anomalies in a disk.…”

Section: Introductionmentioning

confidence: 99%

Probabilistic Sensitivities for Fatigue Analysis of Turbine Engine Disks

Millwater

Osborn

2006

International Journal of Rotating Machinery

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A methodology is developed and applied that determines the sensitivities of the probability-of-fracture of a gas turbine disk fatigue analysis with respect to the parameters of the probability distributions describing the random variables. The disk material is subject to initial anomalies, in either low-or high-frequency quantities, such that commonly used materials (titanium, nickel, powder nickel) and common damage mechanisms (inherent defects or surface damage) can be considered. The derivation is developed for Monte Carlo sampling such that the existing failure samples are used and the sensitivities are obtained with minimal additional computational time. Variance estimates and confidence bounds of the sensitivity estimates are developed. The methodology is demonstrated and verified using a multizone probabilistic fatigue analysis of a gas turbine compressor disk analysis considering stress scatter, crack growth propagation scatter, and initial crack size as random variables.

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Probabilistic Surface Damage Tolerance Assessment of Aircraft Turbine Rotors

Cited by 21 publications

References 11 publications

Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Application of an XML-based Database for Probabilistic Analysis

Probabilistic Sensitivities for Fatigue Analysis of Turbine Engine Disks

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