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1

Static and Dynamic Thermomechanical Buckling Loads of Functionally Graded Plates

Kowal-Michalska K., Mania R. J.

Mechanics and Mechanical Engineering

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2013

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Vol. 17, nr 1

99--112

EN

In the paper the buckling phenomenon for static and dynamic loading (pulse of finite duration) of FGM plates subjected to simultaneous action of one directional compression and thermal field is presented. Thin, rectangular plates simply supported along all edges are considered. The investigations are conducted for different values of volume fraction exponent and uniform temperature rise in conjunction with mechanical dynamic pulse loading of finite duration.

2

A new approach for the analysis of functionally graded beams

Mirzababaee M., Tahani M., Zebarjad S. M.

Journal of Achievements in Materials and Manufacturing Engineering

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2006

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Vol. 17, nr 1-2

265--268

EN

Purpose: It is the intention of the present study to develope a new beam theory for the analysis of functionally graded compopsite beams to overcome the shortcomings present in the existing beam theories. Design/methodology/approach: Within the displacement field of a first-order shear deformation theory and by using the Hamilton principle the governing equations of motion are obtained for both the new and the existing beam theories. The beams are assumed to have isotropic, two-constituent material distribution through the thickness. Findings: It is found that the procedure used is simple and straightforward and similar to the one used in the development of shear deformation plate and shell theories. It is analytically showed that the new approach yields identical results as those obtained by using the existing first-order shear deformation theory. Research limitations/implications: The new approach can be adopted in developing higher-order shear deformation and layerwise theories. It is believed that the new approach has advantage with respect to the existing beam theories especially for developing beam layerwise theories. Practical implications: The new shear deformation beam theory can be used to develop a new beam element for analysis of practical composite beam structures. Originality/value: The paper introduces an approach to develop a new theory for modeling composite beams. The resulting equations of motion may be solved analytically or by using finite element method.

3

Wpływ cech mikrostruktury na procesy pękania i trwałość superstopów niklu z aluminiowymi warstwami ochronnymi w warunkach zmiennych obciążeń cieplno-mechanicznych.

Cieśla M.

Inżynieria Materiałowa

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2002

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R. XXIII, nr 6

749-758

PL

W pracy omówiono wpływ aluminiowych warstw żaroodpornych stosowanych jako pokrycia ochronne łopatek lotniczych silników turbinowych na trwałość żarowytrzymałych stopów niklu w warunkach oddziaływania obciążeń mechanicznych i cieplnych. Analizowano warunki powstawania i wzrostu pęknięć w aluminiowych warstwach ochronnych z uwzględnieniem cech ich mikrostruktury w warunkach zmęczenia wysokocyklowego, niskocyklowego, a także zmęczenia cieplnego.

EN

The paper deals with the influence of aluminium heat-resisting coatings used as protective coatings vor vanes in aircraft turbine engines upon the lifetime of heat-resisting nickel based alloys when thermal and mechanical loadings are being applied. The conditions of initiation and growth of cracks in aluminium protective coating have been analysed with particular attention being paid to their microstructural features in high-cycle, low-cycle and thermal fatigue conditions.