Evaluation of Low-Cycle-Fatigue Life of Solder Joints in Surface Mounting Power Devices by Finite Element Modeling
N. Delmonte, F. Giuliani, M. Bernardoni, P. Cova
Dipartimento di Ingegneria dell'Informazione, Università degli Studi di Parma, Parma, Italy
CDTR - Centre for Device Thermography and Reliability, H. H. Wills Dept. of Physics, University of Bristol, Bristol, United Kingdom
The reliability of solder joints [1,2] is one of the key factors in the determination of the reliability of the high power density electronic converters, being the solder joints both the mechanical, the electrical, and often the thermal connections between the electronic component and the board in which the component is placed. The main mechanism by which solder joints are damaged is thermal ...
Investigation of the Effect of Spinal Defects on Spondylolysis and Stress Fracture of Vertebral Bodies
M.S. Yeoman, C. Quah, A. Cizinauskas, K. Cooper, D. McNally, B. Boszczyk
Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom
The Centre for Spinal Studies and Surgery, Queen’s Medical Centre, Nottingham, United Kingdom
Bioengineering Research Group, Faculty of Engineering, The University of Nottingham, Nottingham, United Kingdom
Spondylolysis (SL) is a defect of the spinal vertebra, and is typically caused by stress fracture of the pars interarticularis bone of the vertebral arch. It is especially common in adolescents who over train in sporting activities. Spina bifida occulta (SBO) is a malformation of the spine where the protruding vertebral bodies are not fully formed. In this study we demonstrate the predisposition ...
V. Antonucci, M. Esposito, R. Marzella, and M. Giordano
Institute for Composite and Biomedical Materials, CNR, Portici, NA, Italy
Imast, Portici, NA, Italy
A quasi static indentation test on a laminate composite has been investigated numerically and experimentally. In particular, the test has been implemented by COMSOL Multiphysics® and optimizing the Finite Element and mesh. In addition, the numerical strain results have been validated by the comparison with the respective experimental deformation data that have been obtained by fiber Bragg ...
Numerical and Experimental Analysis of Natural and Mixed Convection Heat Transfer for Vertically Arranged DIMM
G. Petrone, and G. Cammarata
University of Catania, Catania, Italy
It is commonly recognized that careful thermal design of electronic equipments represents an unavoidable pre-production step in order to ensure reliability and performance of those components during their functioning. This paper mainly concerns a comparison between experimental and numerical results obtained in studying thermal dissipation in natural and mixed convection conditions for RAM ...
J. Wirth, S. Jack, M. Köhl, and K.-A. Weiß
Fraunhofer Institute for Solar Energy Systems ISE, Freiburg, Germany
The key issues of the Fraunhofer Institute for Solar Energy Systems are research and development of solar technologies for the fast growing market of solar energy. This paper presents examples of the usage of COMSOL Multiphysics: The ingress of water is a serious reason for the degradation of photovoltaic modules which can hardly be measured using experimental approaches yet. Therefore, a ...
C. Romao, and M. White
Dept. of Chemistry and Institute for Research in Materials
A series of 2-D finite element models of a ZrO2-ZrW2O8 composite system were created in COMSOL Multiphysics to study the effect of pores between the matrix (ZrO2) and filler (ZrW2O8) materials. Pores were modeled as ellipses concentric with the filler particles. Seventeen model geometries of varying microstructure were studied in order to determine correlations between microstructural factors ...
Using COMSOL to Support a Cost-Effective, Non-Destructive Evaluation Approach for Predicting Bolt Failure in Highway Bridges
A. Elyea, B. Doubek, G. Hubbard, and D. Ozevin
Department of Civil Engineering
University of Illinois at Chicago
The development of a quantitative nondestructive evaluation method, as an alternative to visual inspection, for inspecting pre-tensioned bolts in fracture critical bridges is presented. In order to understand the ultrasonic behavior of a wide variety of bolt geometries used in bridges, numerical models of nine different bolt geometries were developed. The numerical models included the ...
Hoel, A., Jullien, M.C.
SATIE UMR 8029, ENS-Cachan, Campus de Ker-Lann, Bruz
We report numerical simulations in which a 30 µm thick polymer membrane, glued over a submilimetric polymer chamber, is subjected to a homogeneous pressure over its entire surface. The deflections are obtained as a function of the applied pressure, and are further compared to experimental measurements. Finally, the possible origin of the discrepancy between numerical and experimental results may ...
A. Schubert, R. Pohl, and M. Hackert
Chair Micromanufacturing Technology, Faculty of Mechanical Engineering, Chemnitz University of Technology, Chemnitz, Germany
Fraunhofer Institute for Machine Tools and Forming Technology, Chemnitz, Germany
Micro impact extrusion is investigated at Chemnitz University of Technology as a potential procedure for large area machining of micro cavities within the scope of the SFB/Transregio 39 PT-PIESA of the German Research Foundation. Applying impact extrusion micro forming is done by material flow opposite to the effective direction of the force into the structure of the tool. Therefore no structured ...
L. Verbruggen1, J. Kotiniitty2, and M. Lehtonen1
1Power Systems and High Voltage Laboratory, Helsinki University of Technology, Helsinki, Finland
2Nokian Capacitors Ltd., Tampere, Finland
A crucial factor concerning modern reactors is a combination of laws and electro-technical rules defining appropriate produced sound levels. Currently, it is an important issue to reduce noise in order to fulfill all sound requirements. Noise results from reactor vibrations due to sinusoidal currents flowing through the reactor. The flowing currents induce electromagnetic fields which generate ...