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1
Content available Some aspects of dynamic coupled response of functionally graded thin-walled columns with square cross-sections under in-plane pulse compression
Kołakowski Z., Teter A.
Journal of Theoretical and Applied Mechanics
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2016
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Vol. 54 nr 2
449--462
EN
The present paper deals with a dynamic coupled response of functionally graded columns with a quadratic cross-section subjected to an in-plane pulse loading. An Al-TiC metal- -ceramic material is applied. It is assumed that functionally graded materials (FGMs) are subject to Hooke’s law. The thin-walled structures are simply supported at the ends. This study is devoted to the stability problem of rectangular dynamic pulse load. The effects of temperature, wave propagation and damping are neglected. In order to obtain the equations of motion of individual plates, the classic laminate plate theory (CLPT) has been modified in such a way that it additionally accounts for all components of inertial forces. A plate model is adopted for the structures. The problem of an interaction of the global mode with the local ones is concerned (i.e., a three-modes approach). Attention has been focused on some unexpected aspects related to dynamic interactive buckling of columns having two axes of the cross-section symmetry. In the present study, a new approach to the description of this phenomenon, based on Koiter’s theory, has been applied.
2
Content available remote 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.
3
Content available remote Wykorzystanie akumulatora NiMH w zasilaniu diod LED
Wojtkowski W., Karpiuk A.
Przegląd Elektrotechniczny
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2011
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R. 87, nr 4
114-115
PL
Ogromne zainteresowanie wykorzystaniem diod LED do celów oświetleniowych sprawia, iż konstruktorzy coraz więcej uwagi poświęcają układom ich zasilania. Jednym z priorytetów jest uzyskanie wysokiej energooszczędności, co implikuje zastosowanie zasilaczy impulsowych i to zarówno stacjonarnych, jak i mobilnych. W przypadku tych ostatnich źródłem energii jest zazwyczaj akumulator. W artykule przedstawiono wyniki badań laboratoryjnych akumulatorów NiMH 1,2 V, obciążanych prądem impulsowym oraz ciągłym. Zbadano wpływ trybu pracy (ciągła / impulsowa) oraz wartości prądu obciążenia w obu trybach na pracę akumulatora.
EN
The tremendous interest concerning the use of LED lighting, causes increasing attention of specialists paid on LED power supply circuits. One of the most important targets is possibly high efficiency, which imply the use of switching stationary and mobile power supplies. In the case of mobile power supply, usually the rechargeable NiMH battery acts like the energy source. The laboratory results of investigations of the rechargeable NiMH batteries loaded with pulse as well as continuous current are presented in the paper.
4
Content available remote Membrane-flexural coupling effect in dynamic buckling of laminated columns
Mania R. J.
Mechanics and Mechanical Engineering
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2010
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Vol. 14, nr 1
137-150
EN
The purpose of this paper is the analysis of dynamic stability of thin-walled laminated columns of closed rectangular cross-section, subjected to in-plane pulse loading of finite duration. In the analysis with the FE Method the Lagrange strain tensor is assumed and various material characteristics are applied. In the solution the shear influence is considered according to the First Shear Deformation Theory displacement field. In the performed analysis the influence of walls initial imperfections, pulse shape and pulse duration on the dynamic buckling load are examined as well as the stacking sequence of laminated walls, the orientation of principal directions of separate layers and orthotropy ratio. The applications of some dynamic criteria are compared as well.
5
Content available remote About some important parameters in dynamic buckling analysis of plated structures subjected to pulse loading
Kowal-Michalska K.
Mechanics and Mechanical Engineering
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2010
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Vol. 14, nr 2
269-279
EN
In the paper the influence of following factors: initial imperfections, shape and duration of pulse loading on the dynamic response of plate structures is presented; The effect of material properties in the plastic range and the estimation of structure capacity to sustain dynamic pulse loadings based on different dynamic stability criteria is discussed as well.
6
Content available remote Modelowanie drgań wymuszonych w płytach sprężystych przy obciążeniu impulsowym
Paleczek W., Rajczyk Z.
Zeszyty Naukowe Politechniki Częstochowskiej. Budownictwo
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2004
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Z. 10 (158)
111-118
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