Stability of Slender Non-Conservative Columns Made of Thermo-Active Gradient Materials

• Autorzy: Kurnik W.
• Języki publikacji: EN

Abstrakty

EN

The paper is concerned with stability analysis of slender thin-walled cantilever beam subjected to axial distributed follower load, modelled as Leipholz columns and made of functionally gradient materials. Both transverse and longitudinal material gradients are studied as a result of different phase mixture with inclusion of thermo-active shape memory alloy (SMA). Attention is focused on the effect of phase transformation in SMA caused by increase of temperature and resulting in considerable changes of the local visco-elastic material properties which in turn affect system stability. Equivalent homogeneous beam stiffness and internal Kelvin-Voigt loss factor are determined using Kirchhoff's hypothesis and the visco-elastic principle. Partial equation of transverse column vibration is transformed to ordinary equations by means of two-mode Galerkin's discretisation based on the cantilever beam functions. Eigen-value behaviour and critical follower force are studied for various material gradient configurations. A concept of intelligent column is proposed utilizing longitudinal material functionality induced by non-uniform temperature distribution.

Słowa kluczowe

EN

Leipholz column; follower load; shape memory alloy; gradient material; stability

PL

kolumna Leipholza; obciążenie napędzane; stopy z pamięcią kształtu; pamięć kształtu; materiał gradientowy; stabilność

• Wydawca: Oficyna Wydawnicza Politechniki Warszawskiej
• Czasopismo: Machine Dynamics Problems
• Rocznik: 2008
• Tom: Vol. 32, No. 4
• Strony: 50--66
• Opis fizyczny: Bibliogr. 12 poz., wykr.

Twórcy

autor

Kurnik W.

• Warsaw University of Technology,

Bibliografia

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