The Dynamic Influence of Crystal Orientation on a Second Generation Single Crystal Material for Turbine Buckets

2009 ◽  
Author(s):  
Marco Manetti ◽  
Iacopo Giovannetti ◽  
Nicola Pieroni ◽  
Horia Horculescu ◽  
Guido Peano ◽  
...  
Keyword(s):  
Single Crystal ◽  
Gas Turbine ◽  
High Cycle Fatigue ◽  
Natural Frequencies ◽  
Turbine Engines ◽  
Vibration Modes ◽  
Gas Turbine Engines ◽  
Directionally Solidified ◽  
Dynamic Stresses ◽  
High Frequency Vibrations

High cycle fatigue is a factor that influence gas turbine buckets lifetime and it’s due to high frequency vibrations during service. Rotation and fluid flow around the blades cause static and dynamic stresses on the buckets row. For this reason the natural frequencies and HCF resistance evaluation are fundamental in the design phase of gas turbine engines in order to avoid resonance problems during service. Single crystal and directionally solidified superalloys shows anisotropic material properties, in particular single crystal can be modeled as orthotropic material in lattice directions for FEM simulations purposes. In this paper the influence of the lattice growth orientation, identified by two angles, on the natural frequencies of first stage bucket has been investigated. Six-sigma analysis has been performed in order to obtain a transfer function between lattice orientation and bucket vibration. The Design of Experiment (DoE) has been performed using FEA modal results on ten different vibration modes. The results obtained by FEA are verified by an experimental test on the real Heavy Duty MS5002 buckets.

Latest Gas Turbine Repair Techniques Using Laser Technology

1998 ◽  
Author(s):  
A.D. Williams ◽  
J.L. Humphries
Keyword(s):  
Gas Turbine ◽  
Repair Process ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Directionally Solidified ◽  
Laser Technology ◽  
Higher Power ◽  
Recent Developments ◽  
The Cost ◽  
Repair Techniques

Abstract Over recent years, with the drive for new higher power, higher efficiency Gas Turbine engines, manufacturers have had to look at new alloys and new coating techniques to achieve and support the industry requirements. Repair technology has therefore had to keep pace with the OEM advances and much research and development has been undertaken in developing new repair processes. Many of the alloys now used are directionally solidified or single crystal, which until now have been deemed irreparable by traditional welding techniques. Recent developments in the use of lasers have not only rendered these alloys salvageable but have also reduced the overall repair time and therefore the cost. This paper looks at the use of laser technology as a repair process for gas turbine components, touching briefly on laser cutting and drilling but concentrating mainly on laser powder feed welding and its applications.

Smart Structures: Gas Turbine Engine Applications

2001 ◽  
Author(s):  
Sanford Fleeter ◽  
Patrick B. Lawless
Keyword(s):  
Gas Turbine ◽  
Smart Materials ◽  
High Cycle Fatigue ◽  
Smart Structures ◽  
Forced Response ◽  
Smart Structure ◽  
Turbine Engines ◽  
Cost Ratio ◽  
Gas Turbine Engines ◽  
Cycle Fatigue

Abstract This paper is directed at providing the smart structure technology community an introduction to aircraft gas turbine engines issues that might be addressed, i.e. smart/active propulsion systems. Specifically, in gas turbine engines, smart structures can (1) influence performance, stability, noise and high cycle fatigue by providing airfoil aerodynamic control, (2) alleviate or avoid high cycle fatigue due to flutter and forced response by introducing damping intra structures, and (3) provide health monitoring. However, the benefits-to-cost ratio of the added complexity of incorporating smart materials into gas turbine engines must be large as smart materials and actuator/control systems are not a simple solution to complex problems. The prime selling point of smart structure technology to current state-of-the-art gas turbine engines may be adaptability to age, mission, and the environment.

Development of Economically Doped Heat-Resistantnickel Single-Crystal Superalloys for Blades of Perspective Gas Turbine Engines

PRICM ◽  
2013 ◽  
pp. 327-336 ◽  
Author(s):  
Yuriy Shmotin ◽  
Alexander Logunov ◽  
Denis Danilov ◽  
Igor Leshchenko
Keyword(s):  
Single Crystal ◽  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines

Gradient complex protective coatings for single-crystal turbine blades of high-heat gas turbine engines

2007 ◽  
Vol 49 (5-6) ◽  
pp. 253-259 ◽  
Author(s):  
V. P. Kuznetsov ◽  
V. P. Lesnikov ◽  
S. A. Muboyadzhyan ◽  
O. V. Repina
Keyword(s):  
Single Crystal ◽  
Gas Turbine ◽  
Protective Coatings ◽  
Turbine Blades ◽  
High Heat ◽  
Turbine Engines ◽  
Gas Turbine Engines

Control over the substructure of single-crystal blades of gas-turbine engines

2010 ◽  
Vol 46 (14) ◽  
pp. 1541-1542 ◽  
Author(s):  
F. A. Sidokhin ◽  
A. F. Sidokhin ◽  
E. F. Sidokhin
Keyword(s):  
Single Crystal ◽  
Gas Turbine ◽  
Turbine Engines ◽  
Gas Turbine Engines

Development and Design of Directionally Solidified Eutectic Airfoils for Advanced Gas Turbine Engines

1976 ◽  
Author(s):  
M. Gell ◽  
K. M. Thomas
Keyword(s):  
Gas Turbine ◽  
Elastic Anisotropy ◽  
The United States ◽  
Turbine Engines ◽  
Gas Turbine Engines ◽  
Directionally Solidified ◽  
Turbine Engine ◽  
Gamma Prime ◽  
Turbine Blade Design ◽  
Intensive Development

Directionally solidified eutectic airfoils for advanced gas turbine engine applications are undergoing intensive development in a number of laboratories in the United States and Europe. These materials offer the potential of a 40 percent or greater increase in creep strength for high work engines or a 50 K or more increase in blade metal temperature for growth versions of current engines. The development status of these alloys will be described with emphasis on casting techniques, mechanical properties, and coatings for the gamma/gamma prime + delta (γ / γ′ + δ) D.S. eutectic. The implications of the elastic anisotropy and low off-axis properties of the D.S. eutectics to turbine blade design and analysis will be discussed.

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