Relevant bibliographies by topics / Finite Elemente Methode (FEM)

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  1. Journal articles
  2. Dissertations / Theses
  3. Books
  4. Book chapters
  5. Conference papers
  6. Reports

Academic literature on the topic 'Finite Elemente Methode (FEM)'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Finite Elemente Methode (FEM)"

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Bauer, René, Stephan Wolfgramm, Michael Flämmich, and Ute Bergner. "Finite Elemente Methode (FEM) Analyse in der Vakuummechanik." Vakuum in Forschung und Praxis 25, no. 3 (June 2013): 20–25. http://dx.doi.org/10.1002/vipr.201300527.

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Häußler-Combe, U. "Ein Vergleich aktueller numerischer Rechenverfahren am Beispiel von Scheibentragwerken mit Rissen/Current numerical methods in comparison with the example of cracked plates." Bauingenieur 93, no. 04 (2018): 131–40. http://dx.doi.org/10.37544/0005-6650-2018-04-47.

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Neben der konventionellen Finite-Elemente-Methode stellt die numerische Mechanik in ihren neueren Entwicklungen alternative Berechnungsmethoden zur Verfügung. Dies wird am Beispiel ebener Kontinua mit Verformungssprüngen sowie gerissenen Scheiben mit den Methoden „Strong Discontinuity Approach“ (SDA)“, „Extended Finite Elements“ (X-FEM), „Element-Free-Galerkin“ (EFG) und isogeometrischen Methoden (IGA) beschrieben. Dazu werden einerseits gemeinsame Grundlagen, andererseits charakteristische Unterschiede erläutert. Die Anwendung wird an einem gemeinsamen Beispiel veranschaulicht. Schließlich werden die jeweiligen Einsatzmöglichkeiten eingegrenzt.
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Bourauel, Chr, D. Kobe, D. Vollmer, and D. Drescher. "Numerische Simulation kieferorthopädischer Zahnbewegungen mit Hilfe der Finite-Elemente-Methode (FEM)." Biomedizinische Technik/Biomedical Engineering 42, s2 (1997): 339–40. http://dx.doi.org/10.1515/bmte.1997.42.s2.339.

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Weiß, Eckart, Jürgen Rudolph, and Andreas Lietzmann. "Anwendung der Finite-Elemente-Methode (FEM) als Basis der Druckbehälter-Dimensionierung." Chemie Ingenieur Technik 67, no. 7 (July 1995): 874–79. http://dx.doi.org/10.1002/cite.330670711.

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Biermann, D. Prof, E. Özkaya, B. Schniering, and H. G. Koenen. "ToolSimulation für die 3D-Gewindebohrsimulation und Drehmomentvorhersage*/ToolSimulation for the 3D tapping simulation and torque prediction - Development of an FEM-based software system." wt Werkstattstechnik online 107, no. 04 (2017): 293–300. http://dx.doi.org/10.37544/1436-4980-2017-04-97.

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Das Drehmoment bildet sich beim Gewindebohren über die Anschnittlänge und ist eines der wichtigsten Kriterien, um die Leistungsfähigkeit von Werkzeugen zu bestimmen. Mit üblicher Zerspanungssoftware nimmt die dreidimensionale FEM (Finite-Elemente-Methode)-Simulation wegen der hohen Werkzeugkomplexität mit einer Vielzahl an Schneiden sowie unterschiedlichen Eingriffssituationen oft viel Zeit in Anspruch. Der Fachbeitrag stellt die FEM-basierte Software „ToolSimulation“ für die Gewindebohrsimulation mit Drehmomentvorhersage vor. Die Rechenzeit ist bei dieser Software rund 99 % schneller gegenüber anderen 3D-Simulationsprogrammen.   In the tapping process, the torque is generated along the tool‘s chamfer length and is one of the most important criteria for evaluating the tapping tool performance. With conventional machining software, the three-dimensional FEM (Finite Element Method) simulation leads to large computing times, due to the high tool complexity with many different cutting edges, as well as different engagement situations. This paper presents the FEM-based software system “ToolSimulation“, which offers a novel way to create and calculate tapping simulations and an implemented torque prediction method. The computing time for a tapping simulation using this software is about 99 % faster compared to other conventional 3D simulation software.
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Zysset, P. K., and D. H. Pahr. "FE-Simulation in der klinischen Osteoporoseforschung." Osteologie 22, no. 01 (2013): 07–12. http://dx.doi.org/10.1055/s-0038-1630103.

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ZusammenfassungAltersbedingte Osteoporose erhöht des Frakturrisiko. Übliche Diagnoseverfahren basieren auf DXA. Leider sind diese ungenau und erklären oft nicht die Effekte von Behandlungen. Eine neue Methode zur Bestimmung der Knochenfestigkeit beginnt derzeit, sich zu etablieren – die Finite-Elemente-Methode (FEM). Diese universelle, im Bereich der Technik weit verbreitete, Methode erlaubt es, die Diagnose und den Behandlungserfolg besser vorauszusagen als DXA. CT-basierende FEModelle sind stark von der Bildauflösung abhängig. In diesem Überblicksartikel werden drei unterschiedliche Modelltypen (μCT, HRpQCT, QCT) vorgestellt und die Ergebnisse von densitometrischen und FE-Analysen verglichen. Dabei waren die FE-Ergebnisse den densitometrischen immer überlegen. Darüber hinaus erlaubt die FEM die Angabe eines biomechanischen Frakturrisikos. Dieser Vorteil der FE-Methode muss jedoch im Licht der höheren Röntgendosen und Betriebskosten der CT-Bildgebung betrachtet werden. Zukünftig wird die FE-Methode klinisch eine weite Verbreitung finden – die Frage ist nur wann und wie!
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Uhlmann, Eckart, Sebastian Uhlemann, and Jaroslaw Kochan. "In-Situ-Kraftmessung bei variablen Werkzeugwinkeln." VDI-Z 161, Special-I (2019): 30–32. http://dx.doi.org/10.37544/0042-1766-2019-special-i-30.

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Werkzeugentwicklungen sind von iterativen Anpassungen und aufwendigen Versuchsreihen mit einer Vielzahl von Prototypen geprägt. In einem Forschungsprojekt wurde ein sensorisch instrumentiertes Fräswerkzeug mit verstellbaren Schneiden entwickelt und mittels SLM (Selective Laser Melting) aufgebaut. Mit dieser Entwicklung liegt ein Instrument vor, das im Fräsprozess unmittelbar an den Schneiden Belastungen erfassen kann und durch nachgestellte FEM (Finite Elemente Methode)-Analysen sowie Optimierungsroutinen ein enormes Potential für die Auslegung optimierter Werkzeuggeometrien bietet.
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Rhein, Sönke, Tilman Utz, and Knut Graichen. "Dynamische Optimierung von Multiphysik-Problemen am Beispiel induktiver Heizvorgänge." at - Automatisierungstechnik 63, no. 9 (September 8, 2015): 713–26. http://dx.doi.org/10.1515/auto-2015-0029.

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Zusammenfassung Der Beitrag stellt einen Ansatz zur dynamischen Optimierung von Multiphysik-Problemen am Beispiel induktiver Heizvorgänge vor. Hierfür werden im Rahmen eines first-optimize-then-discretize-Ansatzes zunächst die Optimalitätsbedingungen in Form von partiellen Differentialgleichungen aufgestellt. Dies ermöglicht eine elegante numerische Lösung des Problems durch den Einsatz eines Gradientenverfahrens in Verbindung mit FEM-Software (FEM – Finite-Elemente-Methode). Neben der Auslagerung des numerischen Aufwands liegen die Vorteile des Ansatzes insbesondere darin, dass auch Probleme auf komplexen Geometrien relativ einfach behandelt werden können. Die geeignete Formulierung und numerische Lösung des Optimierungsproblems wird anhand von Simulationsergebnissen für die induktive Aufheizung und Oberflächenhärtung eines Zahnrads präsentiert.
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Karadogan, Celalettin, Patrick Cyron, and Mathias Liewald. "Materialcharakterisierung mittels Künstlicher IntelIigenz/Material characterisation by using machine learning models." wt Werkstattstechnik online 110, no. 10 (2020): 656–60. http://dx.doi.org/10.37544/1436-4980-2020-10-12.

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Die für die FEM (Finite-Elemente-Methode)-Simulation von Blechumformprozessen benötigten validierten Materialparameter können heutzutage durch eine vollflächige optische Messung der Verformung eines Prüfkörpers in Kombination mit einem simulationsbasierten inversen Ansatz ermittelt werden. Dieser inverse Ansatz erfordert jedoch Fachwissen in der FEM-Analyse, Optimierung sowie Programmierung und kann zudem recht zeitaufwendig sein. Vor diesem Hintergrund wird in diesem Beitrag eine auf maschinellem Lernen basierende Methode zur Bestimmung von validierten Materialparametern vorgestellt.   Today, validated material parameters required for FE simulation of sheet metal forming processes can be identified via full-field optical measurement of test specimen‘s deformation combined with a simulation-based inverse approach. This inverse approach normally requires deep expertise in FE analysis, optimization, and programming and can be very time-consuming. This paper proposes a novel machine-learning approach for determining such validated material parameters.
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Scheper, Winfried. "Erdwälle als Minderungsmaßnahme gegen Verkehrserschütterungen." Bauingenieur 90, no. 10 (2015): S 7—S 10. http://dx.doi.org/10.37544/0005-6650-2015-10-41.

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Erdwälle sind eine gängige Maßnahme zum Schutz von Personen gegen Verkehrslärm. Mit einer numerischen Parameterstudie wird der Frage nachgegangen, ob Erdwälle gleichzeitig ein guter Schutz gegen Verkehrserschütterungen sind, insbesondere aus Eisenbahnverkehr, und somit eine Alternative zu anderen Maßnahmen auf dem Transmissionsweg wie zum Beispiel Schlitzen und Pfahlreihen wären.   Das numerische Modell benutzt die Finite-Elemente-Methode (FEM) zur Beschreibung des Erdwalls, und koppelt sie mit der Randelemente-Methode (BEM) zur Beschreibung des Untergrundes. Die Berechnung erfolgt im Frequenzbereich, und verwendet eine bezüglich Rechenzeit- und Speicherplatz-Bedarf optimierte Variante der Substrukturmethode.   Es zeigt sich, dass Erdwälle ab einer Anregungsfrequenz von circa 10 Hz eine zunehmende, wenn auch wechselhafte Abschirmkapazität bieten.
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Dissertations / Theses on the topic "Finite Elemente Methode (FEM)"

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Kleditzsch, Stefan, and Birgit Awiszus. "Modeling of Cylindrical Flow Forming Processes with Numerical and Elementary Methods." Universitätsbibliothek Chemnitz, 2012. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-97124.

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With flow forming – an incremental forming process – the final geometry of a component is achieved by a multitude of minor sequential forming steps. Due to this incremental characteristic associated with the variable application of the tools and kinematic shape forming, it is mainly suitable for small and medium quantities. For the extensive use of the process it is necessary to have appropriate simulation tools. While the Finite-Element-Analysis (FEA) is an acknowledged simulation tool for the modeling and optimization of forming technology, the use of FEA for the incremental forming processes is associated with very long computation times. For this reason a simulation method called FloSim, based on the upper bound method, was developed for cylindrical flow forming processes at the Chair of Virtual Production Engineering, which allows the simulation of the process within a few minutes. This method was improved by the work presented with the possibility of geometry computation during the process.
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Holsten, Sven. "FEM-unterstützte Parameterstudie des Innengewinde-Fertigungsverfahrens Gewindefurchen." Kassel : Kassel Univ. Press, 2005. http://deposit.d-nb.de/cgi-bin/dokserv?idn=981992331.

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Iatridis, Konstantin. "Temperaturoptionen für die Elemente BITO und TORU des FEM-Programms COSA." [S.l.] : Universität Stuttgart , Zentrale Universitätseinrichtung (RUS, UB etc.), 1996. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB6783421.

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O, Chol Gyu. "Shape optimization for Two-Dimensional transonic airfoil by using the coupling of FEM and BEM." [S.l. : s.n.], 2006. http://nbn-resolving.de/urn:nbn:de:bsz:93-opus-26978.

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Bernert, Katrin. "Algorithmus zur adaptiven Neuvernetzung des Werkstückes für die FEM-Simulation des Querwalzens." [S.l. : s.n.], 2004. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB11244006.

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Kanzenbach, Lars. "Bestimmung elastischer Ersatzkennwerte von spongiösem Knochen mit Hilfe der Finite-Elemente-Methode." Master's thesis, Universitätsbibliothek Chemnitz, 2013. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-129299.

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The aim of this master’s thesis is to determine the effective material properties of cancellous bone. In the first part of this work, finite element models are used for numerical homogenization of trabecular structures. It is shown that the applied boundary conditions have a strong influence on the effective material properties. To this end, different boundary condition are opposed and discused. In the second part, the Levenberg-Marquardt method is used to identify the preferred direction. Furthermore, it is shown that cancellous bone can be modelled as a transverse isotropic material. Finally, the homogenized continua are compared with the microstructural models of cancellous bone
Ziel der Masterarbeit ist die Bestimmung der effektiven Materialparameter von spongiösem Knochen (lat. spongia „Schwamm“). Die numerische Homogenisierung von Trabekelstrukturen erfolgt mit Hilfe der Finite-Elemente-Methode. Es wird gezeigt, dass die verwendeten Randbedingungen einen starken Einfluss auf die effektiven Materialparameter ausüben. Die verschiedenen Randbedingungen werden dazu gegenübergestellt und diskutiert. Im zweiten Teil erfolgt mit Hilfe des Levenberg-Marquardt-Verfahrens die Identifizierung von ausgezeichneten Richtungen.Weiterhin wird gezeigt, dass die Spongiosa näherungsweise als transversalisotropes Material modelliert werden kann. Am Ende erfolgt der Vergleich des homogenen Ersatzkontinuums mit dem Mikrostrukturmodell der Spongiosa
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Simeitis, Sven D. "Vergleich von Simulationen mittels Pro/MECHANICA und ANSYS." Universitätsbibliothek Chemnitz, 2011. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-qucosa-68443.

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Gegenstand dieser Arbeit ist es, Simulationsergebnisse von Pro/MECHANICA und ANSYS zu vergleichen, um somit einen Hinweis auf die Qualität der Berechnungsergebnisse von integrierten FEM-Systemen zu bekommen. Als Beispiele dienen verschiedene Bauteile aus dem Gebiet der Strukturmechanik (linear-elastischer Bereich), welche mit Pro/MECHANICA und ANSYS modelliert und berechnet werden. Abschließend erfolgt eine Gegenüberstellung der Daten aus FEM und analytischer Rechnung, sowie eine Bewertung der Ergebnisse.
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Buhr, Kai Carsten. "Entwicklung von FEM-basierten Konzepten für die schwingfeste Auslegung von Schraubenverbindungen." Aachen Shaker, 2007. http://d-nb.info/988919249/04.

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Geis, Winfried. "FEM mit web-Spline-Basis analytische und numerische Behandlung geeigneter Gewichtsfunktionen /." [S.l. : s.n.], 2001. http://www.bsz-bw.de/cgi-bin/xvms.cgi?SWB9716178.

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Beuchler, Sven. "Wavelet preconditioners for the p-version of the fem." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600607.

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In this paper, we consider domain decomposition preconditioners for a system of linear algebraic equations arising from the p-version of the fem. We propose several multi-level preconditioners for the Dirichlet problems in the sub-domains in two and three dimensions. It is proved that the condition number of the preconditioned system is bounded by a constant independent of the polynomial degree. The proof uses interpretations of the p-version element stiffness matrix and mass matrix on [-1,1] as h-version stiffness matrix and weighted mass matrix. The analysis requires wavelet methods.
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Books on the topic "Finite Elemente Methode (FEM)"

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Klein, Bernd. FEM: Grundlagen und Anwendungen der Finite-Element-Methode im Maschinen- und Fahrzeugbau : mit 12 Fallstudien und 20 U bungsaufgaben. 8th ed. Wiesbaden: Vieweg + Teubner, 2010.

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FEM: Grundlagen und Anwendungen der Finite-Element-Methode im Maschinen- und Fahrzeugbau. 7th ed. Wiesbaden: Friedr. Vieweg & Sohn Verlag, 2007.

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Gawehn, Wilfried. Finite-Elemente-Methode. Wiesbaden: Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-322-83218-4.

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Steinke, Peter. Finite-Elemente-Methode. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-662-07240-0.

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Gawehn, Wilfried. Finite-Elemente-Methode. Wiesbaden: Vieweg+Teubner Verlag, 1985. http://dx.doi.org/10.1007/978-3-663-14122-8.

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Steinke, Peter. Finite-Elemente-Methode. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-11205-8.

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Steinke, Peter. Finite-Elemente-Methode. Berlin, Heidelberg: Springer Berlin Heidelberg, 2015. http://dx.doi.org/10.1007/978-3-642-53937-4.

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Steinke, Peter. Finite-Elemente-Methode. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-29506-5.

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Nakahashi, Kazuhiro. FDM-FEM zonal method for viscous flow computations over multiple-bodies. Tokyo: National Aerospace Laboratory, 1987.

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John, Robinson. Early FEM pioneers. Wimbourne, Eng: Robinson and Associates, 1985.

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Book chapters on the topic "Finite Elemente Methode (FEM)"

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Fröhlich, Peter. "Finite Elemente Methode." In FEM-Anwendungspraxis, 12–23. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-663-10053-9_2.

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Fröhlich, Peter. "Die Finite Elemente Methode." In FEM-Leitfaden, 13–24. Berlin, Heidelberg: Springer Berlin Heidelberg, 1995. http://dx.doi.org/10.1007/978-3-642-79383-7_2.

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Peiter, Arnold. "Finite-Elemente-Methode (FEM)." In Handbuch Spannungs Messpraxis, 205–8. Wiesbaden: Vieweg+Teubner Verlag, 1992. http://dx.doi.org/10.1007/978-3-322-83108-8_16.

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Silber, Gerhard, and Florian Steinwender. "Finite Elemente Methode (FEM)." In Bauteilberechnung und Optimierung mit der FEM, 230–344. Wiesbaden: Vieweg+Teubner Verlag, 2005. http://dx.doi.org/10.1007/978-3-322-80048-0_6.

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Klocke, Fritz. "Finite Elemente Methode (FEM)." In Fertigungsverfahren 1, 407–40. Berlin, Heidelberg: Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-54207-1_8.

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Gawehn, Wilfried. "Die Formulierung der Fem über das Prinzip vom Minimum der Totalen Potentiellen Energie." In Finite-Elemente-Methode, 151–89. Wiesbaden: Vieweg+Teubner Verlag, 1985. http://dx.doi.org/10.1007/978-3-663-14122-8_12.

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Gawehn, Wilfried. "Die Formulierung der FEM Über das Prinzip vom Minimum der Totalen Potentiellen Energie." In Finite-Elemente-Methode, 151–89. Wiesbaden: Vieweg+Teubner Verlag, 1988. http://dx.doi.org/10.1007/978-3-322-83218-4_12.

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Woyand, Hans-Bernhard, and Herbert Heiderich. "Einführung in die Finite Elemente Methode." In I-DEAS Praktikum CAE/FEM, 5–96. Wiesbaden: Vieweg+Teubner Verlag, 1999. http://dx.doi.org/10.1007/978-3-322-92877-1_2.

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Klein, Bernd. "Grundgleichungen der Linearen Finite-Element-Methode." In FEM, 11–32. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-85604-3_3.

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Klein, Bernd. "Das Konzept der Finite-Element-Methode." In FEM, 42–89. Wiesbaden: Vieweg+Teubner Verlag, 1990. http://dx.doi.org/10.1007/978-3-322-85604-3_5.

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Conference papers on the topic "Finite Elemente Methode (FEM)"

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Liu, G. R. "On Smoothed Finite Element Methods." In ASME 2013 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/imece2013-62239.

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The paper presents an overview of the smoothed finite element methods (S-FEM) which are formulated by combining the existing standard FEM with the strain smoothing techniques used in the meshfree methods. The S-FEM family includes five models: CS-FEM, NS-FEM, ES-FEM, FS-FEM and α-FEM (a combination of NS-FEM and FEM). It was originally formulated for problems of linear elastic solid mechanics and found to have five major properties: (1) S-FEM models are always “softer” than the standard FEM, offering possibilities to overcome the so-called overly-stiff phenomenon encountered in the standard the FEM models; (2) S-FEM models give more freedom and convenience in constructing shape functions for special purposes or enrichments (e.g, various degree of singular field near the crack-tip, highly oscillating fields, etc.); (3) S-FEM models allow the use of distorted elements and general n-sided polygonal elements; (4) NS-FEM offers a simpler tool to estimate the bounds of solutions for many types of problems; (5) the αFEM can offer solutions of very high accuracy. With these properties, the S-FEM has rapidly attracted interests of many. Studies have been published on theoretical aspects of S-FEMs or modified S-FEMs or the related numerical methods. In addition, the applications of the S-FEM have been also extended to many different areas such as analyses of plate and shell structures, analyses of structures using new materials (piezo, composite, FGM), limit and shakedown analyses, geometrical nonlinear and material nonlinear analyses, acoustic analyses, analyses of singular problems (crack, fracture), and analyses of fluid-structure interaction problems.
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Weisensel, G. N., Rick L. Zrostlik, and Gregory P. Carman. "Advanced magnetostrictive finite element method (FEM) modeling development." In 1999 Symposium on Smart Structures and Materials, edited by Vasundara V. Varadan. SPIE, 1999. http://dx.doi.org/10.1117/12.350066.

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Shoji, Yasumasa. "Things to Concern for Finite Element Analyses." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-45718.

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Recently FEA (Finite Element Analysis) is used in various engineering fields such as for design, verification, validation trouble-shooting and other applications. As the more users are treating FEA, the quality of analyses has become the larger issue. Finite Element Method (FEM) is just a calculation method to reproduce physical phenomena, and it has functional limitation in nature. As the software becomes more and more user-friendly, the limitation is hidden in the operation. However, as the limitation still exists in principle, users must be aware of it when using the FEA software. This paper will address about the issues that we are easily trapped in modeling, such as element selection, boundary conditions and other conditions.
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Kamaya, Masayuki, and Toshihisa Nishioka. "Evaluation of Stress Intensity Factors by Finite Element Alternating Method." In ASME/JSME 2004 Pressure Vessels and Piping Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/pvp2004-2734.

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The finite element alternating method (FEAM), in conjunction with the finite element analysis (FEA) and the analytical solution for an elliptical crack in an infinite solid subject to arbitrary crack-face traction, is used for evaluating the stress intensity factor (SIF) of surface cracks. The major advantage of this method is that the SIF can be calculated by using the FEA results for an uncracked body. A newly developed system allows the FEAM to be performed by a simple method, which consists of the conventional FEA for an uncracked body and a subroutine for the FEAM alternating procedure. The SIFs are evaluated for semi-elliptical surface cracks on a plate and in a cylinder as well as interacting cracks on a plate. It is also shown that, by using fine mesh, the maximum error of the evaluation by the FEAM can be suppressed less than 2 percent.
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Kwok, Tsz-Ho. "Geometry-Driven Finite Element for Four-Dimensional Printing." In ASME 2017 12th International Manufacturing Science and Engineering Conference collocated with the JSME/ASME 2017 6th International Conference on Materials and Processing. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/msec2017-2621.

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Four-dimensional (4D) printing is a new category of printing that expands the fabrication process to include time as the forth dimension, and its process planning and simulation have to take time into consideration as well. The common tool to estimating the behavior of a deformable object is the finite element method (FEM). Although FEM is powerful, there are various sources of deformation from hardware, environment, and process, just to name a few, which are too complex to model by FEM. This paper introduces Geometry-Driven Finite Element (GDFE) as a solution to this problem. Based on the study on geometry changes, the deformation principles can be drawn to predict the relationship between the 4D-printing process and the shape transformation. Similar to FEM, the design domain is subdivided into a set of GDFEs, and the principles are applied on each GDFE, which are then assembled to a larger system that describes the overall shape. The proposed method converts the complex sources of deformation to a geometric optimization problem, which is intuitive and effective. The usages and applications of the GDFE framework have also been presented in this paper, including freeform design, reserve design, and design validation.
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Doi, Hiroaki, Hitoshi Nakamura, Wenwei Gu, and Hiroshi Okada. "Development of an Automatic 3D Finite Element Crack Propagation System." In ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-28394.

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When cracks are detected in piping in nuclear power plants during in-service inspections, the crack propagation is usually calculated using approximation formulas of stress intensity factor (SIF) provided in the ASME Code, the JSME Rules or the literature. However, when the crack is detected in complicated-shaped locations in components, finite element analysis (FEA) needs to be used to calculate the SIFs. Accordingly, a method of automatically conducting FEA for crack propagations in nuclear power plants is needed. Therefore, we, the Nuclear Regulation Authority (NRA, Japan) have developed an automatic 3D finite element crack propagation system (CRACK-FEM) for nuclear components. The developed CRACK-FEM uses three methods of SIF calculation: the Virtual Crack Extension Method (VCEM), the Virtual Crack Closure-Integral Method (VCCM) and the Domain Integral Method (DIM). Each method uses different meshes, so users can select a method which uses a suitable mesh for the problem. The software includes a geometry generator to create complicated weld models, and a mesh generator which can deal with interior boundaries formed between different materials. The functions and accuracy of the new software are demonstrated by solving several sample problems involving crack propagation. The contents of this paper were conducted as a research project of the Japan Nuclear Energy Safety Organization (JNES) when one of the authors (Doi) belongs to JNES. After this project, JNES was abolished and its staff and task were absorbed into NRA on March 1, 2014.
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Zaabi, W., Y. Bensalem, and H. Trabelsi. "Fault analysis of induction machine using finite element method (FEM)." In 2014 15th International Conference on Sciences and Techniques of Automatic Control and Computer Engineering (STA). IEEE, 2014. http://dx.doi.org/10.1109/sta.2014.7086711.

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Othman, M., M. Isa, M. N. Mazlee, M. A. M. Piah, and N. Abd Rahman. "Simulation of 33kV String Insulators Using Finite Element Method (FEM)." In 2019 IEEE Student Conference on Research and Development (SCOReD). IEEE, 2019. http://dx.doi.org/10.1109/scored.2019.8896273.

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Agostinho Hernandez, Bruno, Alexander Paterno, Edson Antonio Capello Sousa, João Paulo de Oliveira Freitas, and Cesar Renato Foschini. "Fatigue Analysis of Dental Prostheses by Finite Element Method (FEM)." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-51911.

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Introduction and Objectives: The dental prostheses are typical biomechanical structures because they have the objective to restore the mastication functions and are responsible for replacing the original tooth that was damaged. In the last few years, many studies have been done and big achievements have been noticed in this area. However, clinical studies and experimental procedures for these conditions are sometimes impractical, due to the biological nature of these components and the difficult to reproduce and to analyze such conditions. Moreover, it involves complex geometries, loads and mechanical behaviors, which analytical solution is very difficult to achieve. For these reasons, many researchers have applied the Finite Element Method (FEM). This method allows the evaluation of non-linear situations (e.g. biomechanical interactions) with complex geometries where experimental tests are usually difficult to be conducted. Furthermore, the uses of this method allow failure evaluation and it forecast occurrence. Like any mechanical structure, prostheses are sensible to failures. The cyclic nature of the loading that components are exposed means that fatigue failures are the type of failure which needs more attention in these kinds of structures. Therefore, this project aims to develop a tridimensional finite element model of dental prosthesis in order to evaluate the fatigue problem. Methods: A geometric model from a single dental prosthesis compounded by an implant, an abutment screw, an abutment, a fixation’s screw and a crown will be generated from Micro CT and scanning data. Then, the geometry will be exported to finite element software where a finite element model will be created. After these steps, boundaries conditions will be applied and simulations will be done. Finally, the simulation results will be analyzed. Results: The results from fatigue simulations and analysis demonstrated that abutment screw will have a finite life in most of the analyzed cases, and the fixation screw will be an infinite life. Conclusion: The results obtained illustrate the efficiency of Finite Element Method on simulating the biomechanical conditions, mainly in dental prostheses. In this study, the fatigue conditions were explored and analyzed. Finally, the knowledge about this problem could be improved.
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Fernando, Greshan. "Hybrid Numerical Method for Heat Transfer Analysis of Complex 3D Geometries." In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-33085.

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The heat transfer analysis of systems with complex 3D geometries is usually done by numerical methods. Finite Element Method (FEM) and Finite Difference Methods (FDM) are widely used for this purpose. Complex geometries are accurately analyzed by FEM method. However, FEM solutions can be computationally inefficient for thermal problems that have high mesh densities with complex boundary conditions and variable material properties. On the other hand, Finite Difference method (FDM) is difficult to apply for complex geometric shapes. A hybrid numerical approach that combines the advantages of FDM and FEM has been integrated into a thermal simulation code. The hybrid technique has been implemented using object oriented programming techniques in a PC environment. A comparison of the computational efficiency of the two methods has been presented.
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Reports on the topic "Finite Elemente Methode (FEM)"

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Dolbow, John, Ziyu Zhang, Benjamin Spencer, and Wen Jiang. Fracture Capabilities in Grizzly with the extended Finite Element Method (X-FEM). Office of Scientific and Technical Information (OSTI), September 2015. http://dx.doi.org/10.2172/1244633.

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George A. Zyvoloski, Bruce A. Robinson, Zora V. Dash, and Lynn L. Trease. Summary of the Models and Methods for the FEHM Application-A Finite-Element Heat- and Mass-Transfer Code. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/14903.

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Zyvoloski, G. A., B. A. Robinson, Z. V. Dash, and L. L. Trease. Summary of the models and methods for the FEHM application - a finite-element heat- and mass-transfer code. Office of Scientific and Technical Information (OSTI), July 1997. http://dx.doi.org/10.2172/565545.

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Ravazdezh, Faezeh, Julio A. Ramirez, and Ghadir Haikal. Improved Live Load Distribution Factors for Use in Load Rating of Older Slab and T-Beam Reinforced Concrete Bridges. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317303.

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This report describes a methodology for demand estimate through the improvement of load distribution factors in reinforced concrete flat-slab and T-beam bridges. The proposed distribution factors are supported on three-dimensional (3D) Finite Element (FE) analysis tools. The Conventional Load Rating (CLR) method currently in use by INDOT relies on a two-dimensional (2D) analysis based on beam theory. This approach may overestimate bridge demand as the result of neglecting the presence of parapets and sidewalks present in these bridges. The 3D behavior of a bridge and its response could be better modeled through a 3D computational model by including the participation of all elements. This research aims to investigate the potential effect of railings, parapets, sidewalks, and end-diaphragms on demand evaluation for purposes of rating reinforced concrete flat-slab and T-beam bridges using 3D finite element analysis. The project goal is to improve the current lateral load distribution factor by addressing the limitations resulting from the 2D analysis and ignoring the contribution of non-structural components. Through a parametric study of the slab and T-beam bridges in Indiana, the impact of selected parameters on demand estimates was estimated, and modifications to the current load distribution factors in AASHTO were proposed.
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Martín, A., L. Cirrottola, A. Froehly, R. Rossi, and C. Soriano. D2.2 First release of the octree mesh-generation capabilities and of the parallel mesh adaptation kernel. Scipedia, 2021. http://dx.doi.org/10.23967/exaqute.2021.2.010.

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This document presents a description of the octree mesh-generation capabilities and of the parallel mesh adaptation kernel. As it is discussed in Section 1.3.2 of part B of the project proposal there are two parallel research lines aimed at developing scalable adaptive mesh refinement (AMR) algorithms and implementations. The first one is based on using octree-based mesh generation and adaptation for the whole simulation in combination with unfitted finite element methods (FEMs) and the use of algebraic constraints to deal with non-conformity of spaces. On the other hand the second strategy is based on the use of an initial octree mesh that, after make it conforming through the addition of templatebased tetrahedral refinements, is adapted anisotropically during the calculation. Regarding the first strategy the following items are included:
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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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