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The authors provide a new modeling approach for the simulation of thermo-electro-mechanical stress effects within PCBs (printed circuit boards) and electronic packages. Difficult design challenges created by these effects occur throughout the full range of the product lifecycle, from the concept phase when determining a device's footprint to the analysis of reliability failures encountered after manufacturing...
This paper is concerned with the calculation of stress in the region of interest in complex welded structures. However, analysis of welded structures still remains a challenge for the analyst and in fact cannot be considered as fully resolved for practical applications. The purpose of this paper is to provide some discussion on selected methods recommended by International Institute of Welding (IIW)...
As the most important assembly affecting passengers' safe, automobile seat must meet the requirements of the national standard GB 15083-2006 and even stricter company standards. Seat recliner, which is the major subassembly contributes to the strength of seat, should have strong strength to balance the torque transferred from the backrest. In this paper, a finite element analysis of seat recliner...
Aim of the paper is to evaluate a particular aspect of the design of axial flux permanent magnet (AFPM) machines, i.e. the use of SMC wedges to close stator slots. This contribution is the continuation of a previous investigation dedicated to the analysis of the no-load performance variation introduced by the magnetic wedges. Here, attention is focused on the load performance, by studying the effect...
Three dimensional multiphysics finite element analysis (FEA) was performed to investigate the static and dynamic responses of a micro-switch in harsh temperature environment. The temperature range for the analysis was from -60°C to 100°C. The investigated microswitch consists of a clamped-clamped beam actuated by a bottom electrode coated with dielectric film. Coupled field simulations between the...
The engine can be called the heart of a car and the piston may be considered the most important part of an engine. The piston endures cyclic heat and mechanical loads during work. Heat load was the major factor to cause ablation and heat crack of the piston head, and mechanical load was easy to bring crack at piston pin seat. In this study, mechanical fatigue experiments for one type of piston are...
A new type of cymbal-type transducer, called spherical-cymbal, has been developed to increase the frequency performances of traditional cymbal transducers. Spherical-cymbal transducer consists of a piezoelectric ceramic disk (poled in the thickness direction) sandwiched between two spherical metal end-caps, each end-cap containing a shallow spherical inner cavity. A analytical model was developed...
Jefferson Laboratory is developing a set of innovative superconducting magnets for the 12 GeV upgrade in JLAB Hall C. We will report on the finite element analysis (FEA) of the force collar for the Super High Momentum Spectrometer Cosine Theta Dipole magnet. The force collar is designed with an interference fit and intended to provide enough pressure after cool down to operating temperature to counteract...
In Warsaw University of Technology was developed special BGA256r test specimen [1] for early failure detection during the reliability tests. The failures were detected by resistance measurement by four- point method. Before the reliability tests, the real, initial resistance values were measured. Proposed method of calculation BGA contacts initial resistance is useful for preparing FEA analysis, especially...
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