Development of the Functional Gradient Turbine Wheel With Cooled Blades Without Lock Connection

2020 ◽  
Vol 142 (12) ◽  
Author(s):  
Liubov Magerramova ◽  
Michael Volkov ◽  
Anton Salnikov ◽  
Eugene Kratt
Keyword(s):  
Service Life ◽  
Nickel Alloy ◽  
Mechanical Characteristics ◽  
Dissimilar Materials ◽  
Turbine Wheel ◽  
Disk Radius ◽  
Life Conditions ◽  
Grain Sizes ◽  
Multiparameter Optimization ◽  
Cooling Air

Abstract The blisk design of the wheel with cooled blades is developed on the basis of the turbine wheel with a detachable connection of the blades with the disk. The blades of the blisk are produced from casting heat-resistant nickel alloy. The disk portion is created from granulated alloy with different grain sizes along the disk radius. The system of supplying cooling air in the blades of the wheel is developed. The technology of manufacturing a disk consisting of granules of various sizes and technology of connection of a disk with cooled cast blades is developed. To determine the mechanical characteristics of the zones of connection of dissimilar materials, samples were tested. Multiparameter optimization of the blisk was carried out. The mass of the designed wheel was reduced by more than 40% compared to the original wheel with lock connection when the strength and service life conditions were satisfied.

Development of the Functional-Gradient Turbine Wheel With Cooled Blades Without Lock Connection

2020 ◽  
Author(s):  
Liubov Magerramova ◽  
Michael Volkov ◽  
Anton Salnikov ◽  
Eugene Kratt
Keyword(s):  
Hot Isostatic Pressing ◽  
Dissimilar Materials ◽  
Resource Limitation ◽  
Air Cooling ◽  
Turbine Wheel ◽  
Disk Radius ◽  
Heat Resistant ◽  
Blade Alloy ◽  
Uneven Heating ◽  
Cooling Air

Abstract Wheels of high-temperature turbines are traditionally produced in the form of detachable joints of the disk and blades made from different materials. The blades, which are under the influence of high gas temperatures, are made with internal channels by air cooling. The disk is subject to significant centrifugal loads, but lower temperatures. The locking connection of the blades to the disk is a stress concentrator, which leads to resource limitation. One of the solutions is the wheel of the turbine type blisk consisting of cast-cooled blades of heat-resistant alloys and a disk of granulated nickel alloys, interconnected by hot isostatic pressing. The disk can be made of granules of different sizes in different parts. This approach is based on the fact that during operation, the disk is also subject to uneven heating and loading along the radius. The blisk design of the wheel with cooled blades is developed on the basis of the turbine wheel with a detachable connection of the blades with the disk. The blades of the blisk are produced from casting heat-resistant nickel alloy. The disk portion is created from granulated alloy with different grain sizes along the disk radius. The system of supplying cooling air in the blades of the wheel is developed. The technology of manufacturing a disk consisting of granules of various sizes and technology of connection of a disk with cooled cast blades is developed. To determine the mechanical characteristics of the zones of connection of dissimilar materials samples were tested. The combined samples were made of a granulated alloy with different sizes of granules. The bimetallic samples were made of a casting blade alloy and a granulated disk alloy. Multi-parameter optimization of the blisk was carried out. The mass of the designed wheel was reduced by more than 40% compared to the original wheel with lock connection when the strength and service life conditions were satisfied.

Viability of turbine blade material with a long service life

2019 ◽  
pp. 28-35
Author(s):  
O. B. Berdnik ◽  
I. N. Tsareva ◽  
M. K. Chegurov
Keyword(s):  
Heat Treatment ◽  
Service Life ◽  
Yield Strength ◽  
Mechanical Characteristics ◽  
Operating Time ◽  
Structural Features ◽  
Operating Conditions ◽  
Standard Methods ◽  
Experimental Values ◽  
Plasticity Coefficient

This article deals with structural features and characteristic changes that affect the mechanical characteristics after different service life in real conditions using the example of the blades of the 4th stage of turbine GTE-45-3 with an operating time of 13,000 to 100,000 hours. To study the change in the state of the material under different operating conditions, determine the degree of influence of heat treatment on the regeneration of the microstructure, and restore the mechanical characteristics of the alloy after different periods of operation, non-standard methods were used: relaxation tests on miniature samples to determine the physical yield strength and microplasticity limit and quantitative evaluation of the plasticity coefficient of the material from experimental values of hardness, which allow us to identify the changes occurring in the microvolumes of the material and predict the performance of the product as a whole.

scholarly journals Smart glass as the method of improving the energy efficiency of high-rise buildings

2018 ◽  
Vol 33 ◽  
pp. 02046 ◽  
Author(s):  
Olga Gamayunova ◽  
Eliza Gumerova ◽  
Nadezda Miloradova
Keyword(s):  
Energy Efficiency ◽  
Service Life ◽  
Improve Energy Efficiency ◽  
High Rise ◽  
Life Conditions ◽  
High Rise Building ◽  
Design Engineers ◽  
Combined Models

The question that has to be answered in high-rise building is glazing and its service life conditions. Contemporary market offers several types of window units, for instance, wooden, aluminum, PVC and combined models. Wooden and PVC windows become the most widespread and competitive between each other. In recent times design engineers choose smart glass. In this article, the advantages and drawbacks of all types of windows are reviewed, and the recommendations are given according to choice of window type in order to improve energy efficiency of buildings.

Some Aspects Concerning the Mechanical Characterization versus Manufacturing Technology of Sandwich Composite Materials

2016 ◽  
Vol 834 ◽  
pp. 161-166 ◽  
Author(s):  
Nicolae Constantin ◽  
Marin Sandu ◽  
Adriana Sandu ◽  
Paulina Spânu ◽  
Dorin Roşu ◽  
...  
Keyword(s):  
Composite Materials ◽  
Service Life ◽  
Mechanical Characterization ◽  
Manufacturing Technology ◽  
Special Care ◽  
Sandwich Composite ◽  
Life Conditions ◽  
Point Test ◽  
Sandwich Materials

The paper presents aspects observed during classic three-point test bending of various sandwich materials. These aspects outline the need to spare special attention to such test, in connection with the particular material and service life conditions it will endorse. Such special care is needed in conditions of scarcity of dedicated standards and some evasive formulations in the existing ones.

Features of Work Hardening of Polycrystals with Nanograins

2008 ◽  
Vol 584-586 ◽  
pp. 35-40 ◽  
Author(s):  
Eduard Kozlov ◽  
Nina Koneva ◽  
L.I. Trishkina ◽  
A.N. Zhdanov ◽  
M.V. Fedorischeva
Keyword(s):  
Plastic Deformation ◽  
Grain Size ◽  
Work Hardening ◽  
Mechanical Characteristics ◽  
Grain Boundary Sliding ◽  
Deformation Mechanisms ◽  
Dislocation Slip ◽  
Grain Sizes ◽  
Boundary Sliding ◽  
Size Interval

The present work is devoted to the investigation of the influence of the grain size on the main mechanical characteristics of nanopolycrystals of different metals. The Hall-Petch parameter behaviour for Al, Cu, Ni, Ti and Fe was examined in the wide grain size interval. The stages of plastic deformation and the parameters of work hardening for nanocrystalline copper were analysed in detail. The deformation mechanisms and critical grain sizes accounting for the transition from the dislocation slip to the grain boundary sliding were described.

U-bending spring-back mechanical characteristics of the dissimilar materials double layered sheet

2015 ◽  
Vol 9 (1) ◽  
pp. 271
Author(s):  
Yu-Lim Kim ◽  
Sang-Won Chung ◽  
Sung-Hoon Kim ◽  
Sung-Hoon Jin ◽  
Hyun-Bum Choi
Keyword(s):  
Mechanical Characteristics ◽  
Dissimilar Materials ◽  
Spring Back

scholarly journals Analysis on mechanical characteristics of welded joint with a new reinforced device in high-speed railway

2020 ◽  
Vol 12 (10) ◽  
pp. 168781402096720
Author(s):  
Hong Xiao ◽  
Dongwei Yan ◽  
Guangpeng Liu ◽  
Haoyu Wang
Keyword(s):  
Service Life ◽  
High Speed ◽  
Mechanical Characteristics ◽  
Welded Joint ◽  
Lateral Displacement ◽  
Three Dimensional ◽  
Coupling Model ◽  
Lateral Acceleration ◽  
Track Structure ◽  
Train Speed

High-speed railways adopt continuous welded rail to maintain the smoothness and continuity of the rail surface. However, the welded joint became one of the weakest parts. In order to clear the characteristics and mechanical properties of the new reinforced device, a dynamic three-dimensional vehicle-reinforced device-track coupling model is established. The mechanical characteristics of the track structure under high-speed train load were simulated and analyzed. After installing the new reinforced device, the dynamic response and service life of the track structure are obviously improved compared with the unreinforced rail. When the train speed is 300 km/h, the dynamic bending stress at the bottom of rail is reduced by 26.90%, the vertical and lateral acceleration of the rail are reduced by 42.78% and 21.56%, the vertical and lateral displacement of the rail are reduced by 6.36% and 8.67%, and the theoretical service life of the rail is greatly extended.

scholarly journals Road plates with increased strength characteristics

2018 ◽  
Vol 212 ◽  
pp. 05003 ◽  
Author(s):  
Igor Ivanov ◽  
Andrey Komarov ◽  
Victoria Rosina
Keyword(s):  
Service Life ◽  
Mechanical Characteristics ◽  
Strength Characteristics ◽  
Long Period ◽  
Fiber Concrete ◽  
Temperature And Humidity ◽  
Increased Strength ◽  
Physical And Mechanical Characteristics

The issues of creating road plates with increased operational properties are considered in this paper. Monolithic concrete has a number of disadvantages, such as a long period of strength accumulation, temperature and humidity regime, and the inability to produce works throughout the year. The analyzed material for the production of road slabs (fiber concrete) makes it possible to produce plates with increased strength characteristics, to prolong service life, and to improve their physical and mechanical characteristics.

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