نتایج جستجو برای: deformation energy minimization

تعداد نتایج: 757237  

2009
Philippe G. Ciarlet Cristinel Mardare

We first show how the displacement-traction problem of nonlinear three-dimensional elasticity can be recast either as a boundary value problem or as a minimization problem over a Banach manifold, where the unknown is the Cauchy-Green strain tensor instead of the deformation as is customary. We then consider the pure displacement problem, and we show that, under appropriate smoothness assumption...

Journal: :SIAM J. Math. Analysis 2006
Christoph Ortner

For atomistic material models, global minimization gives the wrong qualitative behaviour; a theory of equilibrium solutions needs to be defined in different terms. In this paper, a concept based on gradient flow evolutions, to describe local minimization for simple atomistic models based on the Lennard-Jones potential, is presented. As an application of this technique, it is shown that an atomi...

1997
Lisong Wang Tsuyoshi Nakamura Minkai Wang Hirohisa Seki Hidenori Itoh

This article considers the problem of generating various calligraphy of Japanese character from some limited existing fonts. We propose a generation method based on the deformable contour model g-snake. By representing the outline of each stroke that makes of a character w i th a g-snake, we cast the generation problem into global and local deformation of g-snake under different control paramet...

Journal: :Nature materials 2014
Jun Sun Longbing He Yu-Chieh Lo Tao Xu Hengchang Bi Litao Sun Ze Zhang Scott X Mao Ju Li

In nanotechnology, small-volume metals with large surface area are used as electrodes, catalysts, interconnects and antennae. Their shape stability at room temperature has, however, been questioned. Using in situ high-resolution transmission electron microscopy, we find that Ag nanoparticles can be deformed like a liquid droplet but remain highly crystalline in the interior, with no sign of dis...

Journal: :SIAM J. Math. Analysis 2014
José Carlos Bellido Carlos Mora-Corral

We present an existence theory based on minimization of the nonlocal energies appearing in peridynamics, which is a nonlocal continuum model in solid mechanics that avoids the use of deformation gradients. We employ the direct method of the calculus of variations in order to find minimizers of the energy of a deformation. Lower semicontinuity is proved under a weaker condition than convexity, w...

1999
Lisong WANG Lifeng HE Tsuyoshi NAKAMURA Atsuko MUTOH Hidenori ITOH

This paper considers the problem of generating various calligraphy from some sample fonts. Our method is based on the deformable contour model g-snake. By representing the outline of each stroke of a character with a g-snake, we cast the generation problem into global and local deformation of g-snake under different control parameters, where the local deformation obeys the energy minimization p...

2011
Matthias Kirschner Stefan Wesarg

Active Shape Models (ASMs) are a popular family of segmentation algorithms which combine local appearance models for boundary detection with a statistical shape model (SSM). They are especially popular in medical imaging due to their ability for fast and accurate segmentation of anatomical structures even in large and noisy 3D images. A well-known limitation of ASMs is that the shape constraint...

1999
BO LI

Abstract. We give results for the approximation of a laminate with varying volume fractions for multi-well energy minimization problems modeling martensitic crystals that can undergo either an orthorhombic to monoclinic or a cubic to tetragonal transformation. We construct energy minimizing sequences of deformations which satisfy the corresponding boundary condition, and we establish a series o...

Journal: :مهندسی بیوسیستم ایران 0
آذین زند میرالوند دانشگاه محقق اردبیلی منصور راسخ دانشیار گروه مهندسی بیوسیستم، دانشگاه محقق اردبیلی عزت اله عسکری اصلی ارده دانشیار گروه مهندسی بیوسیستم دانشگاه محقق اردبیلی

this study was carried out to determine some mechanical properties of barley seed including deformation, rapture force, rapture energy and toughness as a function of moisture content (10.5%, 12.5%, 14.5% , 16.5%, db), loading rate (5, 15, 25, 35 mm.min-1) and grain size (small, medium, large). tests were performed at 7 replications by the means of a factorial base plot experiment. the results s...

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