A stiffened DKT shell element

Özdamar, Hasan Hüseyin
A stiffened DKT shell element is formulated for the linear static analysis of stiffened plates and shells. Three-noded triangular shell elements and two-noded beam elements with 18 and 12 degrees of freedom are used respectively in the formulation. The stiffeners follow the nodal lines of the shell element. Eccentricity of the stiffener is taken into account. The dynamic and stability characteristic of the element is also investigated. With the developed computer program, the results obtained by the proposed element agrees fairly well with the existing literature.


A Shear flexible facet shell element for large deflection and instability analysis
Oral, Süha (Elsevier BV, 1991-12-01)
A facet shell element based on an anisoparametric plate bending element and a quadratic plane-stress element with vertex rotations is formulated for geometrically nonlinear analysis of shells. The updated Lagrangian formulation which proves to be effective for three-node elements is employed. The restriction of small rotation between the increments is removed by using Hsiao's finite rotation method in which the rigid body motion is eliminated from the total displacement. The displacement control is used to ...
A Mindlin plate finite element with semi-analytical shape design sensitivities
Oral, Süha (2000-11-01)
A hybrid-stress Mindlin plate finite element and its sensitivity derivatives are presented. The element is triangular and has a simple nodal configuration with three corner nodes and C-o type nodal variables. The use of independent field assumptions for displacements and stresses removes the necessity for an in-plane shear correction factor. The element can effectively be used as the bending part of facet shell elements. Its simplicity and accuracy makes it ideal for large-scale analysis and design problems...
Product-oriented material testing and FEA for hyperelastic suspension jounce bumper design
Caliskan, Kemal; Konukseven, Erhan İlhan; Unlusoy, Y Samim (2010-01-01)
The basic problem in the finite element analysis of parts made of hyperelastic materials is the identification of mathematical material model coefficients. Furthermore, selection of a suitable mathematical hyperelastic material model may not be straightforward. In this study, a design methodology is presented for hyperelastic suspension jounce bumpers. The commonly used traditional trial-and-error method for jounce bumper design results in high mould costs for prototype production and prolongs the time requ...
A Micromechanics Based Numerical Investigation of Dual Phase Steels
Yalçınkaya, Tuncay; Çakmak, Serhat Onur (Elsevier BV; 2019-01-01)
The aim of this paper is to investigate the effects of microstructural parameters such as the volume fraction, morphology and spatial distribution of the martensite phase and the grain size of the ferrite phase on the plasticity and localized deformation of dual-phase (DP) steels. For this purpose, Voronoi based representative volume elements (RVEs) are subjected to proportional loading with constant stress triaxility. Two alternative approaches are employed in a comparative way to model the plastic respons...
A revision of cascade synthesis theory covering cross-coupled filters
Yıldırım, Nevzat; Sen, OA; Sen, Y; Karaaslan, M; Pelz, D (2002-06-01)
The classical zero-shifting technique is generalized to cover extraction of complex transmission zeros (TZs) in the form of fourth-order LC sections whereby the jomega- and alpha-axis TZs appear as special cases. Using this approach, bandpass filters can be synthesized in direct coupled resonator forms by pole placement instead of designing them through low-pass prototypes. By using circuit transformations, the resulting direct coupled resonator filter circuits can then be transformed into a variety of cros...
Citation Formats
H. H. Özdamar, “A stiffened DKT shell element,” M.S. - Master of Science, Middle East Technical University, 2005.