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Saturday, May 9, 2020 | History

2 edition of Optimal design of rotating disks in creep. found in the catalog.

Optimal design of rotating disks in creep.

Ole Gunneskov

Optimal design of rotating disks in creep.

by Ole Gunneskov

  • 203 Want to read
  • 32 Currently reading

Published by Technical University of Denmark in Lyngby .
Written in English


Edition Notes

SeriesDCAMM report -- No. 87
The Physical Object
Pagination23 s
Number of Pages23
ID Numbers
Open LibraryOL19989241M

VISCOUS INSTABILITY TRIGGERED BY LAYERED ACCRETION IN PROTOPLANETARY DISKS Yasuhiro Hasegawa1,2,4 and Taku Takeuchi3,5 1 Division of Theoretical Astronomy, National Astronomical Observatory of Japan, Osawa, Mitaka, Tokyo , Japan 2 Jet Propulsion Laboratory, California Institute of Technology, Pasadena, CA , USA; Cited by: 6. Topics: Flow (Dynamics), Heat transfer, Rotating disks, Disks, Cavities, Coolants, Cooling, Engines, Gas turbines, Momentum. Disintegration of Oil Jets Emerging From Axial Passages at the Face of a Rotating Cylinder Design, Failure mechanisms, Blades, Creep, Fatigue, High temperature, Oxidation, Stress Design Study of.

  Report presenting an investigation to determine the influence of strength and ductility on the room-temperature burst characteristics of solid disks, disks with large-diameter central holes, and disks with small-diameter central holes. Results regarding the stress concentrations causing fracture, ratio of disk strength to tensile strength, effect of small holes, Cited by: 3. Topics: Design, Disks, Flow (Dynamics), Vibration, Blades, Lumped parameter models, Engineering simulation, Optimization, Rotors, Simulation Method for Analysis of Nonlinear Multiharmonic Vibrations of Mistuned Bladed Discs With .

Report presenting an investigation to determine the influence of strength and ductility on the room-temperature burst characteristics of solid disks, disks with large-diameter central holes, and disks with small-diameter central holes. Results regarding the stress concentrations causing fracture, ratio of disk strength to tensile strength, effect of small holes, and evaluation of most Cited by: 3. Preforming the Spinning Disk Illusion is pretty cool, but it isn’t a science fair project. You can create a science fair project by identifying a variable, or something that changes, in this experiment. Let’s take a look at a variable option that might work: Try testing the Spinning Disk Illusion on a variety of different people.


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Optimal design of rotating disks in creep by Ole Gunneskov Download PDF EPUB FB2

Optimal distribution of thickness in the class of polynomial functions for rotating axisymmetric disks with respect to the mixed creep rupture time are found. Optimal distribution of thickness in the class of polynomial functions for rotating axisymmetric disks with respect to the mixed creep rupture time are found.

Two effects lead to damage: reduction of transversal dimensions and growth of micro-cracks are simultaneously taken into : Aneta Ustrzycka, Krzysztof Szuwalski, Zbigniew L.

Kowalewski. The problem of optimal design with respect to ductile creep rupture time for rotating disks is solved. The finite strain theory is applied, the material is described by the Norton-Bailey law generalized for true stresses and logarithmic strains. The set of four partial differential equations describing the problem is by: The obtained results are compared with the optimal disks with respect to ductile creep rupture time.

Keywords: mixed creep rupture, structural optimization, full disk. 1 Introduction Structural elements working under creep conditions belong to the relatively new branches of structural optimisation, started in the seventieth years of the last Author: K. Szuwalski, A.

Ustrzycka. This paper presents a procedure for rational design of high speed rotating disks. Optimum configurations are automatically calculated to satisfy the designer’s objective within given constraints.

The study illustrates the applicability of programming techniques to the optimal selection of the dimensions for such by:   Gas turbine disks are subject to mechanical stresses due to centrifugal forces exerted by the blades, as well as thermal stresses due to high temperature gradient.

High stresses in the presence of elevated temperatures cause the rotating disk material to undergo considerable by: 1. Numerical Aspects 11 OPTIMAL DESIGN OF ROTATING DISKS The results of the preceding sections show that the solution of our optimization problem can be reduced to the solution of the linear, partial differential equation (), subject to the initial condition ().

This is a simple result in that, for a fixed value of I, Eqs. At steady-state condition, creep rate is assumed to be the product of a function of stress, a function of time and a function of is further assumed that with metallic material available for gas turbine disks, the creep laws follow (a) power function stress-creep-rate relation for relatively low stresses and (b) exponential Cited by: The rotating disks of a gas turbine engine are subjected to body forces, blade loads, and thermal loads as well as shaft torque loads and engine thrust and landing loads.

The important design loads are body forces, blade loads, and thermal loads. The influence of other loads on disk overall design is only Size: 8MB. Materials Science Forum (Trans Tech Publishers), (), pp. The steady state creep behaviour of a rotating FGM disc having linearly varying thickness has been investigated.

Rotating Discs The Rotating Disc Consider a thin disc rotating with constant angular velocity, Fig. Material particles are subjected to a centripetal acceleration a r 2 r. The subscript r indicates an acceleration in the radial direction File Size: 86KB.

• rotating disks with blades are wide used in different constructions • there are ~30 rotating disk in one gas turbine engine • on conceptual design stage an engineer needs a tool to obtain optimal shape for a future design in short time intervals a turbojet engine.

The steady state creep behaviour of a rotating FGM disc having linearly varying thickness has been investigated. The disc is assumed to be made of functionally graded composite containing non-linearly varying radial distribution of silicon carbide particles in a matrix of pure aluminum.

The creep behaviour of the composite has been described by threshold stress based by: 5. Journal of Biomimetics, Biomaterials and Biomedical Engineering Materials Science.

Defect and Diffusion Forum. Ole Vincent Larsen has written: 'Under offentlighedsplanet' 'Livs-dage' 'Fra de halve ere' 'Inspirationens geografi' -- subject(s): Politics and culture, Creation (Literary, artistic, etc. You can write a book review and share your experiences.

Other readers will always be interested in your opinion of the books you've read. Whether you've loved the book or not, if you give your honest and detailed thoughts then people will find new books that are right for them. Batra, R.C.

() Optimal design of functionally graded incompressible linear elastic cylinder and sphere, AIAA Journal, 46 (8): – Becht, IV C., and Chen, Y. () Span limits for elevated temperature.

ABSTRACT: Creep stresses have been obtained for a thin rotating disc having variable thickness and variable density with edge load.

Results obtained have been discussed and depicted graphically. It has been seen that a rotating disc whose density and thickness decreases radially with edge load is much safer for a design in comparison to a flat. - R.F. Gibson “Measurement of creep in rotating viscoelastic disks” Experimental Mechan no.

10 (): - K.A. Stetson “The use of an image derotator in hologram interferometry and speckle photography of rotating objects” Experimental Mechan no. To design a disc or shaft that can withstand these stresses without catastrophic failure in flight, it is important to understand the loads acting on them.

This section analyses the stress and strains acting on rotating discs and cylinders. Thus mm distance between disks, rpm as rotating speed, and special machining on the surface of disks were chosen as optimal parameters for sewage disintegration in this system. Thin liquid film flow between rotating disks can be encountered in many industrial processes with high rotation rate and consequently high shear rate [ 13 ].Cited by: 2.REFERENCES: 1 Machine Design/ Maleev and Hartman/ C.B.S Publishers, India.

2 Gear engineering/ Henry / Wheeler publishing, Allahabad. 3 Practical Gear design/ Darle McGraw-Hill book company.

4 Analytical mechanics of gears/ Earle Buckingham/ Dover publications, New York, 5 Hand book of gear design/ Design against Burst of Rotating Discs Introduction. In a study was conducted into the burst of rotating steam turbine wheels or discs. The speed at which burst occurred was found to correlate with the speed at which the average hoop stress reached the ultimate tensile strength of the material and an empirically derived formula for the design of turbomachinery discs was born.