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The present work deals with discrete-time models for the relaxation of soft biological connective tissues. Those are living materials composed of living cells embedded in a mainly organic intercellular substance. Wiener models, consisting of a linear dynamical model followed by a polynomial static function are used for identification of stress relaxation curves, drawn from experiments performed on...
The most important stress factors for electric machines insulation in the automotive environment can be summarized by the mnemonic expression TEAM (thermal, electrical, ambient, and mechanical stress). Even already each individual of the above mentioned stresses can be fatal for the electric machine insulation they generally act simultaneously making even worse deterioration process and so faster...
Drawing principles, or aesthetics, are important in graph drawing. They are used as criteria for algorithm design and for quality evaluation. Current aesthetics are described as visual properties that a drawing is required to have to be visually pleasing. However, most of these aesthetics are originally proposed without consideration of graph structure information. Therefore their ability in visually...
Simulation of human heart mitral valves is a challenging biomechanical problem due to its complex anatomical structure, material properties and time dependent loading conditions. This study presents a modeling and simulation of human mitral valve behavior considering the effects of material nonlinearity and Chordae tendineae rupture via a numerical analysis. Three-dimensional sized geometrical model...
Universally more than 2lakh people are ailing from hip failure every year and the remedy for this problem in replacement. The main objective of this project is to develop a three dimensional surface and solid finite element model of the cement less hip prosthesis, fabricating it with suitable material.
The main objective of the paper is to discuss the feasibility study of an outdoor based machine which is called customisable all terrain mobile robot from the technical inception stage. The machine is designed to enable certain organization to fully benefit the robot functionality into many working scope. The main objective of the paper is to study the geometrical and technical design of the machine...
The paper that is based on the mesoscopic damage evolution of metal explores the mechanism of Kaiser effect. Unidirectional and multidirectional tensile experiments of Q345 material were conducted to reveal the relationship between the internal damage evolution of mesoscopic holes and Kaiser effect. The results show that the forcewill cause the damage corresponding to the direction of force. When...
The need for mechatronic devices that are lightweight, less cumbersome and able to produce small, quick and precise movements or forces is ever increasing in many fields of engineering. Many recent design solutions are based on electrically, magnetically or thermally activated materials, often referred to as smart materials. This tutorial paper overviews the main properties and the resulting applications...
This work makes a study about obtaining elastography images, or elastogram from ultrasound RF frames. This technique is very useful in the improvement of medical diagnosis of diseases affecting the biological tissues, including cancer. One of the decisive factors for the quality of a clinical diagnosis is the precision of the results derived from a clinical test. In particular, in this work the quality...
In order to participate in the Formula SENA ECO, which is a national design and race performance competition using electric drive system vehicles, these must be lightweight, have a lower drag coefficient and high energy efficiency. An engineering redesign has been developed at the vehicle rear section using the CATIA PLM-tool, providing an optimized solution which focuses on main issues and needs...
A battery separator isolates anode and cathode electrically and contributes to the ionic conductivity on the one side. On the other side, it is a highly sensitive functional component concerning mechanical loads. During production as well as the operation of a battery this thin, polymer based film is stressed by compressive and tensile forces. This contribution presents an enhanced characterization...
In earlier work it was recommended that accelerated tests, using elevated currents, be used to evaluate the performance of contact designs using materials that may be susceptible to electro-migration. This is necessary since it was found in earlier work that the type of self-diffusion in some cases had a major impact on time to failure. Since the type of diffusion is generally not known in advance,...
In this paper, a new subjective assessment system for video quality is proposed to acquire accurate assessment result, which consists of three assessment methods. In addition, a combined screening strategy is presented to ensure the final result's reliability. The reliability of the assessment result proved to be promoted after introducing multiple methods of assessment and screening strategies.
Thermo-mechanical stress caused by the mismatch of coefficients of thermal expansion (CTE) and temperature variations remain a major concern for the reliability of semiconductor components. This issue is usually addressed by exposing the component to temperature cycling stress tests for a certain number of cycles, followed by e.g. scanning acoustic microscopy (SAM) to investigate delamination. Discussions...
The paper addresses the electrical and mechanical design process of a traction motor for a hybrid bus application. In general, the design process of the electric motors requires intimate co-operation between different engineering disciplines. Often compromises are needed in order to satisfy both the electrical and mechanical performance specifications. From the mechanical point of view the stress...
Diamond windows have an important role in fusion power applications, as this material only currently enables both tritium confinement and transmission of mm-wave power in the MW range. Diamond window units are safety related components and therefore their integrity has to be guaranteed both during normal and accidental operation, like, for example, in absence of coolant flow. In this work, a beam...
The objective of this paper is to present the thermal and mechanical stress analysis of an additively manufactured induction motor for traction applications. The additive manufacturing process enables higher copper fill factors in the stator core of the machine and also improves the internal thermal conduction in the stator core. While a higher copper fill factor increases the machine power density,...
The electrical performance and reliability of a through-silicon via is investigated through two-dimensional and three-dimensional simulations. Due to the large differences in material thicknesses present in the structures, a 3D simulation is often not feasible. The thermo-mechanical stress, the electrical parameters including TSV resistance and capacitance, as well as the electromigration-induced...
A consistent thermoelectroelastic description of piezoelectric semiconductors with finite deformation is presented. By including both kinematic and constitutive nonlinearities as well as a proper treatment of the electrostatic conditions at free surfaces, the theory allows situations with large strains to be modeled more accurately. In addition, the theory is rotationally invariant unlike the linear...
Tissues such as skeletal muscle and kidneys have well-defined structure that affects the measurements of mechanical properties. As an approach to characterize the material properties of these tissues, different groups have assumed that they are transversely isotropic (TI) and measure the shear wave velocity as it varies with angle with respect to the structural architecture of the organ. To refine...
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