نتایج جستجو برای: shell element
تعداد نتایج: 253778 فیلتر نتایج به سال:
219-235, ASME winter meeting, Anaheim, CA, Nov. 1998. ABSTRACT A new finite element approach to sandwich shells is proposed. It uses existing shell finite elements formulated for homogeneous shells. The “sandwich” nature of the problem is hidden from the main finite element program. Based on several assumptions the proposed homogenization procedure calculates stress increments in a homogeneous ...
This work deals with the three-dimensional magneto-thermo-elastic problem of a functionally graded truncated conical shell under non-uniform internal pressure and subjected to magnetic and thermal fields. The material properties are assumed to obey the power law form that depends on the thickness coordinate of the shell. The formulation of the problem begins with the derivation of fundamental r...
ABSTRCT Prediction of the vibro-acoustic responses of fluid-loaded cylindrical shells is important for underwater vehicles. In this work, a number of analytical and numerical approaches to predict the radiated sound power of a fluid-loaded cylindrical shell are compared. In the first approach, an analytical methodology is used whereby the equations of motion for the cylindrical shell are solved...
Results obtained for a class of degenerated shell elements formulated in convected (curvilinear) coordinates are presented. Each node has five degrees of freedom, with displacements expressed directly in global coordinates. Rotations o'f directors are treated in an efficient manner that preserves continuity across interelement boundaries, and allows treatment of general boundary conditions. A c...
INTRODUCTION Fracture risk predictio osteoporosis. However, the s controversial. While some st over 45% of the load [1, 2], 15% [3, 4]. Furthermore, dif shell have been reported [5, technology and high-perform to measure cortical shell thi analyze tissue level stress d element modeling (μFE) at t has been applied to the hum exist for the human vertebra. The overall goal of th cortical shell in ...
this study presents the first ever data of extracting chitin from the chiton shell, which then converted to the soluble chitosan by soaking in the 45% naoh solution. the obtained chitin and chitosan were characterized by the seven different methods. antioxidant activity of the extracted chitosan was also evaluated using the two methods. the shell content was divided into calcium carbonate (90.5...
A Three-dimensional Layer-wise Constant S·hear Element for General Anisotropic Shell-type Structures
This paper deals with the development of a new three-dimensional element with two-dimensional kinematic constraints capable of analysing the mechanical behaviour. of the laminated anisotropic shell-type structures. This element, originally developed for the linear 'analysis of plates, is extended for the linear analysis of laminated composite shells. The element can represent arbitrarily curved...
We present results from recent time-of-flight nuclear mass measurements at the National Superconducting Cyclotron Laboratory at Michigan State University. We report the first mass measurements of ^{48}Ar and ^{49}Ar and find atomic mass excesses of -22.28(31) MeV and -17.8(1.1) MeV, respectively. These masses provide strong evidence for the closed shell nature of neutron number N=28 in argon,...
Structural optimization using computational tools has become a major research field in recent years. The paper deals with a sizing optimization analysis of laminated circular cylindrical shell. For thin-walled shells, the classical shell theory is capable of accurately predicting the shell behavior. The weight minimization subjected to displacement constraint within the numerical optimization o...
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