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Thin film metallic conductors or interconnects are subjected to increasingly high current densities as the feature sizes decrease that can lead to failure of interconnects in moderately short times. Modelling of failure in micro electronic materials involves several challenges such as electro-migration and stress driven diffusion. These physical phenomena are usually negligible in conventional applications...
This paper presents a transient thermal analysis using Finite Element Method (FEM) to model the heat input effect of the Gas Metal Arc Welding (GMAW) process in plates of Al-6061-T6 with 4.8 mm of thickness. To validate the numerical results, a set of experiments were developed measuring temperatures along a perpendicular line from the weld cord. A good agreement was found between numerical and experimental...
This work presents the research towards two promising embedding approaches for electronic components with a possible application to integrate a sensor node for structural health monitoring into the structure itself. The production process for both integration methods has been assessed through experimental and simulation effort. Samples with passive components for both presented approaches have been...
In this paper a miniature circuit breaker (MCB) is analyzed using a finite method analysis (FEA) software. Once the 3D model was implemented, a series of simulations were carried out in order to find out the forces that appear inside the electromechanical trip unit and what influences the plunger to trip faster. Also, the influence of the material nonlinearity is emphasized in order to understand...
Beam elements have played a very important role in modeling mechanical engineering structures. Curved beams are known to be more efficient in transfer of loads than straight beams. The transfer in the curved beam is affected by means of bending, shear and membrane action. This is particularly important in studying initially curved beams. The aim of this project is to improve the use and flexibility...
This paper presents a static analysis of beams made of Functionally Graded Materials (FGMs) by using Finite Element Method (FEM). The behavior of FGM beam under mechanical and thermal load is studied within the experience of Timoshenko beam theory. The material properties are assumed to be temperature-independent, and are graded in the thickness direction according to a simple power law distribution...
The Molding process of injection-molded plastics induces certain characteristics in the material that are not accurately modeled in the conventional FEM methodologies for Mechanical stress analysis and Modal analysis. This paper brings out the challenges that are encountered in the current simulation methodologies and discusses few of the methods practiced in the industry to overcome these challenges...
In this work, novel chemical-mechanical polishing modeling schemes in both wafer and device levels are proposed and analyzed. The cellular automata method, based on Preston equation and contact mechanics, are used for analyzing the wafer level material removing rate. On the other hand, a finite element and Matlab integration scheme is also developed, primarily for addressing the structural integrity...
A free-space method where a pair of conical horns with dielectric lenses are used has an advantage that one can estimate material constants without electromagnetic absorbers. Since the analysis region for the free-space method in a 3-dimensional (3-D) electromagnetic analysis is very large, we investigate the usefulness of 2-D FEM analysis and the plane wave spectrum method in 3- and 2-D FEM analysis...
An investigation and analysis of core losses in rotating AC machines shows that the stator is subjected to different types of flux density including pulsating and rotating. The rotating flux can be elliptical or circular. This paper describes the influence of different flux patterns on core loss estimation. Three different machines are simulated to calculate the zones of rotating flux density in the...
With continuing miniaturization and more prevalent use of Ball Grid Array (BGA) packages in the microelectronics industry, the mechanical strength of Printed Circuit Board Assemblies (PCBAs) with BGA packages is becoming very critical. In a variety of applications ranging from smart phones to high end switches and routers, the mechanical robustness of PCBAs is becoming the key differentiator in product...
Firstly, this paper conducted the failure modes and effects analysis (FMEA) for the certain hydraulic system; secondly, it calculated the impact load of the hydraulic system when it works; and based on above results of FMEA and the calculation of impact load, it has made the finite element analysis to key components in Abaqus which caused most failures. Finally, it optimized the design of the sealing...
To reduce the weight of bracket and production cost of the naval gun, the aluminum board welded structure is used. The strength check analysis must be conducted for the fire safety. Firstly, based on the three-dimensional CAD model of the bracket and according to the design date, the geometry of model was simplified. Secondly, the FEM model of the bracket was built with the FEM software MSC. Patran,...
Ensuring reliability of interfaces of dissimilar materials is one of the most critical design aspects of electronic assemblies. A study on the interface delamination phenomenon of different power packages was undertaken. Thermally induced stresses caused by the thermal mismatch between molding compound (MC), Si-die, and Cu- heatsink act as combined shear and normal loadings on the respective interfaces...
A nine-leaf steel spring used in the rear suspension system of a light duty vehicle is analyzed by finite element method using ANSYS software. The finite element analysis results of stress and deflection are verified with the analytical solution and experimental results. It is proposed to replace the existing steel spring with composite spring. With the results of the steel leaf spring, a mono leaf...
The paper presents the result of studies and investigations related to planar thermoelectric generators, intended to be realized through printing technologies. The recent development in printing technologies and materials makes possible the realization of thermoelectric pairs in planar configuration as an alternative to the already used devices. The use of printing technologies permits the realization...
Instruments with multiple degree-of-freedom (DOF) distal joints may facilitate laparoscopic surgery significantly, but the articulating driving mechanism presents many design challenges. The aim of this study is to investigate the ergonomic requirements for single incision laparoscopic surgery (SILS) and design a flexible driving mechanism which can be used for single port laparoscopic surgery. In...
Mechanical design and analysis of innovative test socket is done in this study by using ANSYS as Finite Element Analysis (FEA) software. It is designed to solve the problems brought to the IC leads by pogo pins in the IC testing process. Proposed test socket is formed as an array of holes filled with electrical conductive cells. Each cell consists of three different parts, including micro-contactors,...
In order to improve the stiffness and reduce the weight of the main support structure of space camera, some problems in the truss design were taken into account in this paper. A 4-layer multi-truss made of carbon fiber composite was used in the main support structure for designing a kind of space camera with 7m focal length, relative aperture 1:6. The angles between trusses, pole cross section and...
Effects of retention groove location and dimensions of threaded glass fiber post on the maximum retention force of the restorative system and the maximum equivalent stress in the root were numerically investigated. Results show that the retention groove can effectively enhance retention ability and reduce the stress in the root. And the maximum retention force of the restorative system can be increased...
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