52 research outputs found
Non-wetting drops at liquid interfaces: From liquid marbles to Leidenfrost drops
We consider the flotation of deformable, non-wetting drops on a liquid
interface. We consider the deflection of both the liquid interface and the
droplet itself in response to the buoyancy forces, density difference and the
various surface tensions within the system. Our results suggest new insight
into a range of phenomena in which such drops occur, including Leidenfrost
droplets and floating liquid marbles. In particular, we show that the floating
state of liquid marbles is very sensitive to the tension of the
particle-covered interface and suggest that this sensitivity may make such
experiments a useful assay of the properties of these complex interfaces.Comment: 21 pages, 9 figures. Minor typos correcte
Buckling Response of Thick Functionally Graded Plates
In this paper, the buckling of a functionally graded plate is studied by using first order shear deformation theory (FSDT). The material properties of the plate are assumed to be graded continuously in the direction of thickness. The variation of the material properties follows a simple power-law distribution in terms of the volume fractions of constituents. The von Karman strains are used to construct the equilibrium equations of the plates subjected to two types of thermal loading, linear temperature rise and gradient through the thickness are considered. The governing equations are reduced to linear differential equation with boundary conditions yielding a simple solution procedure. In addition, the effects of temperature field, volume fraction distributions, and system geometric parameters are investigated. The results are compared with the results of the no shear deformation theory (classic plate theory, CPT)
Far From Threshold Buckling Analysis of Thin Films
Thin films buckle easily and form wrinkled states in regions of well defined
size. The extent of a wrinkled region is typically assumed to reflect the zone
of in-plane compressive stresses prior to buckling, but recent experiments on
ultrathin sheets have shown that wrinkling patterns are significantly longer
and follow different scaling laws than those predicted by standard buckling
theory. Here we focus on a simple setup to show the striking differences
between near-threshold buckling and the analysis of wrinkle patterns in very
thin films, which are typically far from threshold.Comment: 4 page
Transonic and supershear crack propagation driven by geometric nonlinearities
Linear elastic fracture mechanics theory predicts that the speed of crack
growth is limited by the Rayleigh wave speed. Although many experimental
observations and numerical simulations have supported this prediction, some
exceptions have raised questions about its validity. The underlying reasons for
these discrepancies and the precise limiting speed of dynamic cracks remain
unknown. Here, we demonstrate that tensile (mode I) cracks can exceed the
Rayleigh wave speed and propagate at supershear speeds. We show that taking
into account geometric non-linearities, inherent in most materials, is
sufficient to enable such propagation modes. These geometric non-linearities
modify the crack-tip singularity, resulting in different crack-tip opening
displacements, cohesive zone behavior, and energy flows towards the crack tip.Comment: 8 pages, 4 figure
Buckling Response of Thick Functionally Graded Plates
In this paper, the buckling of a functionally graded plate is studied by using first order shear deformation theory (FSDT). The material properties of the plate are assumed to be graded continuously in the direction of thickness. The variation of the material properties follows a simple power-law distribution in terms of the volume fractions of constituents. The von Karman strains are used to construct the equilibrium equations of the plates subjected to two types of thermal loading, linear temperature rise and gradient through the thickness are considered. The governing equations are reduced to linear differential equation with boundary conditions yielding a simple solution procedure. In addition, the effects of temperature field, volume fraction distributions, and system geometric parameters are investigated. The results are compared with the results of the no shear deformation theory (classic plate theory, CPT)
Buckling Analysis of Laminate Short Beams by High Order Theory
Le comportement de cisaillement transversal des poutres composites peut ĂȘtre critique et doit donc ĂȘtre correctement reprĂ©sentĂ© par les diffĂ©rents modĂšles des structures utilisĂ©es habituellement pour prĂ©voir leur comportement ou pour identifier leurs propriĂ©tĂ©s. On propose dans ce travail, une analyse de gauchissement dans les poutres stratifiĂ©es courtes selon une approche analytique simple basĂ©e sur des thĂ©ories dâordre Ă©levĂ©.The transverse shear behavior of the composite beams can be critical and must therefore be properly represented by the various models of structures normally used to predict their behavior or to identify their properties. We propose in this work, a warpage analysis in short laminated beams using a simple analytical approach based on the theories of higher order
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