A Probabilistic Approach to Aircraft Turbine Rotor Material Design

Leverant, G. R.; Littlefield, David L.; McClung, R. Craig; Millwater, Harry; Wu, Justin

doi:10.1115/97-gt-022

Cited by 32 publications

(18 citation statements)

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“…Nearly a decade ago, the Federal Aviation Administration (FAA) and the Rotor Integrity Subcommittee (RISC) of the Aerospace Industries Association (AIA) proposed a probabilistic damage tolerance approach to account for the presence of metallurgical (inherent) and manufacturing (surface damage) anomalies that can occur during the manufacturing process (Leverant et al 1997. This recommendation, based on the results of a National Transportation Safety Board report (NTSB 1990) linking metallurgical anomalies to uncontained engine events, led to the development of an advisory circular (FAA 2001) and the Turbine Rotor Material Design (TRMD) research program and associated DARWIN  (Design Assessment of Reliability with INspection) computer software (Southwest Research Institute 2003).…”

Section: Introductionmentioning

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 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: Introductionmentioning

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 equations and the finite difference results are in good agreement. A "cumulative" sensitivity for the disk for propagation scatter median and cov is computed by summing over all zones in (7). The sensitivity with respect to a min shows some disparity due to the extremely small sensitivity.…”

Section: Multizone 24 Zones Totalmentioning

confidence: 99%

“…As examples, though not exhaustive, the following input data have been developed: the frequency and probability distribution for the initial defect size of hard alpha particles in titanium [6,7], the constitutive properties of hard alpha defects [8], the crack growth rate in a vacuum for titanium [8], fatigue testing of the initiation of cracking for hard alpha defects [9], effects of residual stresses around hard alpha particles [10], the expected amount of variation in fatigue crack propagation scatter [11], and weight-function-based stress intensity factor equations for flaws under a bivariant stress field [12]. An FAA advisory circular has been issued that describes a probabilistic methodology and suggested input data to quantify the POF with respect to hard alpha defects [13].…”

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 analyses of prognostic uncertainty were performed using a probabilistic life prediction code DARWIN (Leverant et al, 1977) as a demonstration platform. DARWIN integrates finite-element stress analysis results, fracture-mechanics-based life assessment for low-cycle fatigue, material anomaly data, probability of anomaly detection and inspection/monitoring schedules to determine the probability-of-fracture of rotor disks as a function of operating cycles.…”

Section: State Of the Art: Stochastic Fatigue Modelingmentioning

confidence: 99%

Stochastic Prognostic Paradigm for Petrochemical Pipelines Subject to Fatigue

Jaoude¹

2013

American Journal of Engineering and Applied Sciences

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The most important aim for industrialists is the prevention and the evaluation of their products state since non-predicted failure is very expensive in some cases. This can be done mainly by the evaluation of the "Remaining Useful Lifetime" (RUL) by the means of prognostic approaches compensating the inconveniences of classical maintenance strategies. A proposed analytic prognostic methodology based on damage laws, such as Paris-Erdogan's and Palmgren-Miner's laws, is developed here to determine the RUL of the system. It permits to ensure a high availability and productivity with less cost for industrial systems. To make this approach more reliable, it is essential to introduce the stochastic description. For the case of fatigue effect where damage state is growing from macro-cracks to total failure, D(N) expresses an increasing scalar damage function in terms of loading cycles N. The RUL is estimated from a predefined threshold of damage D C . Pipelines tubes, subject to fatigue effects due to pressure-depression alternation, belong to vital mechanical systems in petrochemical industries that serve to transport natural gases or liquids. The prognostic evaluation of their states increases the tubes availability while minimizing their missions cost.

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A Probabilistic Approach to Aircraft Turbine Rotor Material Design

Cited by 32 publications

References 0 publications

Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Probabilistic Methodology for Life Prediction of Aircraft Turbine Rotors

Probabilistic Sensitivities for Fatigue Analysis of Turbine Engine Disks

Stochastic Prognostic Paradigm for Petrochemical Pipelines Subject to Fatigue

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