The main objective of this paper is to study the effect of extrusion parameters (extrusion stresses and temperature) and die geometry, i.e. extrusion radius, on the extruded aluminum quality using FEM Simulation Technique. For this purpose, the general FEA Software ABAQUS was used to set up the finite element model of the warm aluminum extrusion in two dimensions (2D). Aluminum alloy Al-2014 wa...

The hp version of the finite element method (hp-FEM) combined with adaptive mesh refinement is a particularly efficient method for solving partial differential equations (PDEs) because it can achieve an exponential convergence rate in the number of degrees of freedom. hp-FEM allows for refinement in both the element size, h, and the polynomial degree, p. Like adaptive refinement for the h versi...

An extra-stabilized Morley finite element method (FEM) directly computes guaranteed lower eigenvalue bounds with optimal a priori convergence rates for the bi-Laplacian Dirichlet eigenvalues. The smallness assumption in 2D (resp., 3D) on maximal mesh-size makes computed th discrete bound . This holds multiple and clusters of eigenvalues serves localization eigenvalues, particular coarse meshes....

This work investigates fracture characteristics of a marble semi-circular bend (SCB) specimen with pre-defined crack under compressive loading condition. It aims at evaluating how the toughness can be affected by and span length variation. Numerically, model is solved using meshless methods, extended to linear elastic mechanics (LEFM), resorting radial point interpolation method (RPIM) its natu...

Recent studies show that the shape of internal cavity with periodic distribution has a significant impact on characteristics anechoic coating. In this study, we proposed genetic algorithm-based method for optimizing design parameters By transforming 3D finite element model (FEM) coating to 2D axisymmetric (AFEM), and COMSOL MATLAB co-simulation combined algorithm applied obtain optimal paramete...

Robotic grasping of deformable objects is inherently different from that of rigid objects, and is an under-researched area. Difficulties arise not only from expensive deformable modeling, but also from the changing object geometry under grasping force. This dissertation studies strategies of grasping deformable objects using two robotic fingers. Discovering the inapplicability of the traditiona...

Van der Waals (VDW) heterojunctions in a 2D/2D contact provide the highest area for separation and transfer of charge carriers. In this work, top-down strategy with gas erosion process was employed to fabricate carbon nitride VDW heterojunction (g-C3N4) carbon-rich nitride. The created 2D semiconducting channel structure exhibits enhanced electric field exposure radiation absorption, which faci...

In order to get insight information of the band structure acoustic metamaterials (AMMs) in condensed matter, periodic lattice structures are analyzed using Bloch’s theorem. Typical approaches computation methods, topology optimization, and tunable abilities cannot overcome gap between two-dimensional (2D) AMMs theoretical three-dimensional (3D) specimens’ experimental data yet. this work, varia...

In the context of substrate resistance modeling a combined BEM/FEM method is compared to a 3DFEM method. The combined BEM/FEM method is applicable in substrate modeling problems which involve layout-dependent doping patterns for which a standalone BEM would not be accurate enough and for which a standalone FEM would be too slow. The method captures local couplings within the doping pattern with...