Drastic tailorable thermal expansion chiral planar and cylindrical shell structures explored with finite element simulation

Bifurcation of multi-layer microstructures subjected to thermal loading can be harmful for reliability and stability of MEMS structures. In this paper, three imperfections of geometry, coefficient of thermal expansion and thermal loading were introduced to investigate their effects on structural bifurcation by finite element simulation. Results show that bifurcation is strongly influenced by the imperfections. With larger deviation of imperfections, it results in a decreasing temperature to trigger the bifurcation and a gradual beginning of it.

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Impact Response of Laminated Composite Cylindrical Shell: Finite Element Simulation Approach

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.393.387 ◽

2013 ◽

Vol 393 ◽

pp. 387-392 ◽

Cited By ~ 1

Author(s):

S. Sharifi ◽

Thamir Aunal Deen Mohammed Sheet Almula ◽

Soheil Gohari ◽

G. Sharifishourabi ◽

Yob Saed ◽

...

Keyword(s):

Finite Element ◽

Cylindrical Shell ◽

Finite Element Simulation ◽

Laminated Composite ◽

Impact Response ◽

Low Velocity Impact ◽

Composite Cylindrical Shell ◽

Low Velocity ◽

Element Simulation ◽

Shell Finite Element

The effect of low velocity impact response on the thin laminated composite cylindrical shell with different stacking sequences was investigated. Finite element simulation using ABAQUS software was the base of the study during the analysis. The framework was to study the stress and displacement in radial and circumferential directions through finite element simulation. For simplicity, an arbitrarily picked circumferential path at where the impactor impacts the shell surface was selected. The graphs plotted based on stress and displacement variables Vs radial and circumferential directions did not show the significant changes for laminations with different stacking sequences. In addition, The 90 degree along circumferential and radial directions was found to be the critical point.

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Simulation of an Adaptive Fluid-Membrane Piezoelectric Lens

10.20944/preprints201910.0244.v1 ◽

2019 ◽

Author(s):

Hitesh Gowda Bettaswamy Gowda ◽

Ulrike Wallrabe

Keyword(s):

Fluid Dynamics ◽

Finite Element ◽

Thermal Expansion ◽

Finite Element Simulation ◽

Piezoelectric Effect ◽

Experimental Results ◽

Comsol Multiphysics ◽

Fluid Forces ◽

Element Simulation ◽

Fluid Membrane

In this paper, we present a finite element simulation of an adaptive piezoelectric fluid-membrane lens modeled in COMSOL Multiphysics. The simulation couples the piezoelectric effect with the fluid dynamics to model the interaction between piezoelectric forces and fluid forces. Also, the simulation is extended to model the thermal expansion of the fluid. Finally, we compare the simulation and experimental results of the adaptive lens refractive power at different actuation levels and temperatures.

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