{"title":"A parametric multilevel MEMS simulation methodology using finite element method and mesh morphing","authors":"V. Kolchuzhin, J. Mehner","doi":"10.1109/ESIME.2012.6191776","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191776","url":null,"abstract":"The MEMS designing is a very challenging and interdisciplinary task. The paper deals with advanced computational methodology required to extend the considered effects within the ordinary FE-analyses taking into account parameter variation at the physic and system levels.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"161 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129059239","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Combined creep and fatigue measurement method for lead-free solder alloys","authors":"R. Metasch, M. Roellig, K. Wolter","doi":"10.1109/ESIME.2012.6191735","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191735","url":null,"abstract":"This work studies the secondary creep behaviour at approx. 25% stress drop in the fatigue curve on bulk solder specimens in a tensile and compression experiment. With the adaption of the pre-factor of the secondary creep models the acceleration is describable. To get a good correlation between the model as well as the real tensile and compression experiments, advanced modelling with primary and tertiary creep will be necessary.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"327 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123936524","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
K. El boubkari, S. Azzopardi, L. Théolier, J. Delétage, E. Woirgard
{"title":"2D finite elements electro-thermal modeling for IGBT: Uni and multicellular approach","authors":"K. El boubkari, S. Azzopardi, L. Théolier, J. Delétage, E. Woirgard","doi":"10.1109/ESIME.2012.6191757","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191757","url":null,"abstract":"In this paper, insulated gate bipolar transistor (IGBT) models in the literature are reviewed, analyzed, and classified in different categories. We compare unicellular and multicellular modeling for the hard-switching between finite elements electro-thermal simulations applied on a silicon power transistor and we show the advantages of multicellular modeling applying on a planar gate non punch through IGBT (PG-NPT-IGBT). It appears that degradation of one or more cells shows intercellular electrical phenomena which can lead to failure of components.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121381715","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Evaluation of very low bending radius of flexible circuits beyond the standard design rules","authors":"W. M. Filho, S. Hameau, M. Brizoux","doi":"10.1109/ESIME.2012.6191716","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191716","url":null,"abstract":"The Flexible Printed Circuits (FPC) used in high-end applications have some specific characteristics. It has a more complex build-up and must be compatible with repair processes. Moreover, they are used in harsh environment and long mission profile. Current FPC design are based on industrial standards, which propose design rules, such as minimum bending radius calculated from the maximum accepted copper elongation. This work is part of a large study focused on the development of a new generation of digital board solutions for electronic interconnection. In this paper, a finite element simulation study will be applied to FPC bending analysis beyond industrial standard limits. As a conclusion, we propose to consider the maximum copper strain and the bending shape for the minimum bending radius definition.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121789608","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Thermal and moisture degradation in SSL system","authors":"S. Koh, W. Driel, G. Zhang","doi":"10.1109/ESIME.2012.6191806","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191806","url":null,"abstract":"Currently, most of the SSL research on SSL's failure is based on thermal induced failure. This is insufficient as application such as outdoor street lighting and automotive headlights are exposed to both high humidity and temperature. This will induced additional hygroscopic stress which may induced further degradation of the SSL system. However, there is only limited studies in the literature that investigates the effect of the degradation of SSL's life due to the hygroscopic stress degradation. This is because the current thermal moisture methodology for computing combine hygroscopic and thermal stress is only limited to linear elastic analysis where linear superposition is value. In this research, numerical analysis capable of modeling nonlinear thermal and hygroscopic effect has been developed. Using this method, this paper will compare the failure of light emitting diode due to thermal mechanical with or without the additional hygroscopic stresses. This is also important since accelerated testing using increase temperature may not be sufficient due to the very narrow temperature range that it can be used to perform a valid test. Hence, by understand hygroscopic stresses induced failure in solder layer; it may enable another parameter to increases the accelerated factors during these tests.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127666500","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Molecularly derived mesoscale modeling of an epoxy/Cu interface (part III*): Interface roughness","authors":"N. Iwamoto","doi":"10.1109/ESIME.2012.6191702","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191702","url":null,"abstract":"This paper addresses use of coarse-grained mesoscale model to look at angle dependencies in an epoxy-copper (I) oxide interface in order to understand roughness effects on adhesion. The parameterization of the coarse-grained beads were previously parameterized from the molecular level [1-3] for the same polymer and copper oxide interface. Roughness was investigated in two ways: applying a zigzag interface to the interface separation simulation, and separating the interface using differing angles. When compared, both methods reduce to the similar energy trends. In addition, the effect moisture on the interface was compared for the rough and smooth interfaces.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"23 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128257939","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Experimental system for analysing the combined loading and failure modes of solder joints in electronic packaging","authors":"K. Jankowski, A. Wymyslowski, D. Chicot","doi":"10.1109/ESIME.2012.6191743","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191743","url":null,"abstract":"Reliability of solder joints plays a major role in the electronic packaging. Indeed, the solder joints serve not only for the transmitting of electrical signals, but also for the heat transportation and as a structural support which is one of the most important aspects. Keeping of all these features is extremely difficult, due to different thermo-mechanical loadings, which cause slow degradation of the joints in the process of time. This paper will present preliminary results concerning an experimental method for testing the reliability of solder joints. This original method allows the precise separation of the selected degradation factors due to creep and fatigue. For this purpose the experimental setup and corresponding device (FRIS) have been developed and manufactured including displacement sensor of the micrometer order, which is mounted directly at the test sample. This allows both the measurement of the sample displacement submitted to two types of external thermomechanical loadings: - Creep resulting of constant loading applied over a long period of time, - Fatigue resulting from multicyclic loading. Additionally it is planned the application of these two types of loading in a form of a combined load in order to analyse and verify the influence of damage accumulation due to creep and fatigue solicitations on the solder joint behaviour. The above will be as well analysed by an appropriate FEM numerical modelling and simulation techniques.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114788818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Lifetime assessment of BGA solder joints with voids under thermo-mechanical load","authors":"R. Schwerz, M. Roellig, K. Meier, K. Wolter","doi":"10.1109/ESIME.2012.6191756","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191756","url":null,"abstract":"This study examines the reliability of solder joints with voids under thermo mechanical loading. Nondestructive and destructive failure analysis has been done to inspect the presence and distribution of voids in a BGA component with 100 IO connections. Characteristic voiding scenarios have been created and implemented in a three dimensional finite-element model representing the component. The results of the nonlinear finite element analysis (FEA) are compared to the experimental thermal cycling results. A refined model including a critical joint of the package is then used to focus on the influence of voids. It will be shown that voids can increase a joint's reliability, have negligible impact or heavily reduce the lifetime all depending on the location and size within the solder volume.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"57 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133220934","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Study of an active thermal recovery mechanism for an electrostatically actuated RF-MEMS switch","authors":"T. Kuenzig, J. Iannacci, G. Schrag, G. Wachutka","doi":"10.1109/ESIME.2012.6191766","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191766","url":null,"abstract":"We present a comprehensive study on an electrostatically actuated RF-MEMS switch with active thermal recovery capability intended to counteract stiction. On the basis of finite element (FE) simulations a detailed model including all relevant physical effects has been developed to investigate this recovery mechanism. The resulting model enables to reproduce the whole recovery process during a failure situation of the switch, proving its functionality and, thus, identifying and elaborating possible design improvements. The simulated results are confirmed by experimental data obtained from white-light interferometry (VEECO) and laser-Doppler vibrometry (Polytec).","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"145 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133446194","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"The method of lines for the analysis of mechanical structures","authors":"A. Taghavi, L. Vietzorreck","doi":"10.1109/ESIME.2012.6191784","DOIUrl":"https://doi.org/10.1109/ESIME.2012.6191784","url":null,"abstract":"In this contribution it is shown how the Method of Lines (MoL), a semi-analytical numerical method, can be used for the analysis for mechanical structures. The Method of Lines discretizes the problem in two dimensions, in the remaining direction an analytical solution is taken. This is extremely advantageous for the analysis of cascaded or finite periodic structures. Mechanical structures with a finite periodicities are e.g. acoustic mirrors for bulk acoustic wave (BAW) resonators. Those mirrors, used to isolate the vibrating structure from the substrate, consist of an alternating series of low- and high-impedance acoustic layers to absorb the mechanical movement. Results for the eigenmodes of the mechanical structures as well as the behavior of a layer stack are shown.","PeriodicalId":319207,"journal":{"name":"2012 13th International Thermal, Mechanical and Multi-Physics Simulation and Experiments in Microelectronics and Microsystems","volume":"3 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-04-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130482587","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}