Optimum Fracture Control Plan for Gas Turbine Engine Components PDF Download
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Author: T. Lassen
Publisher:
ISBN:
Category : Data analysis
Languages : en
Pages : 14
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Book Description
This paper describes a probabilistic damage tolerance concept for the fatigue damage in gas turbine engine components. The statistical scatter in time to crack initiation is considered using a Weibull distribution, while the stochastic crack growth is treated by a Markov chain approximation. The approximation is a unit-jump discrete state/discrete time Markov chain where damage states are related to the fatigue crack depths. The model parameters are estimated from experimental statistics and a linear fracture mechanics simulation of the fatigue propagation. The effect of in-service inspection is considered by the use of Bayesian updating techniques. The analysis verifies that it is possible to extend the service life and maintain the fatigue reliability of critical components by an appropriate periodic inspection program.
Author: T. Lassen
Publisher:
ISBN:
Category : Data analysis
Languages : en
Pages : 14
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Book Description
This paper describes a probabilistic damage tolerance concept for the fatigue damage in gas turbine engine components. The statistical scatter in time to crack initiation is considered using a Weibull distribution, while the stochastic crack growth is treated by a Markov chain approximation. The approximation is a unit-jump discrete state/discrete time Markov chain where damage states are related to the fatigue crack depths. The model parameters are estimated from experimental statistics and a linear fracture mechanics simulation of the fatigue propagation. The effect of in-service inspection is considered by the use of Bayesian updating techniques. The analysis verifies that it is possible to extend the service life and maintain the fatigue reliability of critical components by an appropriate periodic inspection program.
Author: C. Amzallag
Publisher: ASTM International
ISBN: 0803119852
Category : Fracture mechanics
Languages : en
Pages : 668
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 504
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Author: United States. Naval Air Systems Command
Publisher:
ISBN:
Category : Aeronautics, Military
Languages : en
Pages : 276
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Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 804
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: B. A. Cowles
Publisher:
ISBN:
Category :
Languages : en
Pages : 44
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Book Description
The purpose of this task was to investigate the current life prediction methodology for multiple crack growth in gas turbine engine components. To this end, experimental and analytical efforts were carried out. Current prediction methods for very small cracks (as small as 0.005 x 0.010 inches) were modified to address the larger interacting cracks produced by the controlled preflaw methods used in this program. The authors conclude that: (1) The modified crack growth life prediction technique currently in use resulted in acceptable but conservative predictions in all cases. Variability in the predictions was also acceptable and was similar to variability in predicted versus actual results for singular crack cases. (2) The multiple-degree-of-freedom approach also produced acceptable life predictions and, in fact, demonstrated reduced variability in predicted versus actual results. It was, however, more complicated to use and did not result in a consistent conservative bias in the life predictions. (3) Based on this study, the modified crack growth life prediction technique currently in use is considered adequate for Retirement-for-Cause applications. The multiple-degree-of-freedom approach offers potential improvements for future use.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 1042
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Author: Link C. Jaw
Publisher:
ISBN:
Category :
Languages : en
Pages : 14
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Book Description
This paper describes damage mechanisms and the methods of controlling damages to extend the on-wing life of critical gas turbine engine components. Particularly, two types of damage mechanisms are discussed: creep/rupture and thermo-mechanical fatigue. To control these damages and extend the life of engine hot-section components, we have investigated two methodologies to be implemented as additional control logic for the on-board electronic control unit. This new logic, the life-extending control (LEC), interacts with the engine control and monitoring unit and modifies the fuel flow to reduce component damages in a flight mission. The LEC methodologies were demonstrated in a real-time, hardware-in-the-loop simulation. The results show that LEC is not only a new paradigm for engine control design, but also a promising technology for extending the service life of engine components, hence reducing the life cycle cost of the engine.
Author:
Publisher:
ISBN:
Category : Aeronautics
Languages : en
Pages : 310
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Author: United States. National Aeronautics and Space Administration
Publisher:
ISBN:
Category :
Languages : en
Pages : 598
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