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The present work contributes to the development of a stable and robust approach for the numerical simulation of fluid-structure interaction problems. In particular two-dimensional and three-dimensional elastic structues interacting with incompressible flow are considered. The structural field is governed by the nonlinear elastodynamic equations while the dynamics of the fluid field are described by the incompressible Navier-Stokes equations. Both fields are discretised by finite elements in space and finite difference methods in time. An iteratively staggered partitioned coupling procedure with relaxation is applied to obtain the overall coupled solution.\r\n\r\nThis work focuses on methodological aspects and contributes to a deeper understanding of the theoretical foundations of the approach. This is necessary to ensure that the formulation is stable and offers reliable results for a wide range of parameters. In particular the flow solver formulated in an arbitrary Lagrangean Eulerian approach is considered. In addition to the classical conservation laws of mass, linear momentum and energy geometric conservation has to be considered. This is a consequence of the formulation of the flow equations with respect to a moving frame of reference. The relationship of these conservation laws and the stability of the numerical scheme is investigated and stability limits in terms of maximal time step sizes for different formulations are established. It is further shown how an unconditionally stable ALE formulation has to be constructed. Another key issue is the stabilised finite element method employed on the fluid domain. The derivation of the method from a virtual bubble approach is revisited while special attention is turned to the fact that the domain is moving. A version of the stabilisation is derived which is nearly unaffected by the motion of the frame of reference. Further the sensitivity of the stabilised formulation with respect to critical parameters such as very small time steps, steep gradients and distorted meshes is assessed. At least for higher order elements where full consistency of the formulation is assured very accurate results can be obtained on highly distorted meshes.\r\n\r\nAs another main issue the coupling of fluid and structure within a partitioned scheme is considered. A first concern in this context is the exchange of proper coupling data at the interface which is crucial for the consistency of the overall scheme. Subsequently the so-called artificial added mass effect is analysed. This effect is responsible for an inherent instability of sequentially staggered coupling schemes applied to the coupling of lightweight structures and incompressible flow. It is essentially the influence of the incompressibilty which excludes the successful use of simple staggered schemes. The analysis derived in the course of this work reveals why the artificial added mass instability depends upon the mass ratio but further on the specific time discretisation used on the fluid and structural field. In particular it is shown why more accurate temporal discretisation results in an earlier onset of the instability.\r\n\r\nWhile the theoretical considerations are accompanied by small numerical examples highlighting particular aspects some larger applications of the method are finally presented.", "doi" : "10.18419/opus-270", "bibtexKey": "forster2007robust" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/278293cdc02891d66c42c34c19559323f/ibb-publication", "tags" : [ "FE","KT","from:maltevonscheven","ibb","phdthesis" ], "intraHash" : "78293cdc02891d66c42c34c19559323f", "interHash" : "2be5c5d22cc0886f0a78a2fe0e242471", "label" : "Kontaktanalyse dünnwandiger Strukturen bei großen Deformationen", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:57", "changeDate" : "2021-03-24 14:38:48", "count" : 1, "pub-type": "phdthesis", "publisher":"Doktorarbeit, Bericht Nr. 49, Institut für Baustatik und Baudynamik, Universität Stuttgart", "year": "2007", "url": "", "author": [ "Stefan Hartmann" ], "authors": [ {"first" : "Stefan", "last" : "Hartmann"} ], "abstract": "The present thesis is concerned with the numerical simulation of contact problems of thin-walled structures using the finite element method. A mortar-based contact formulation is presented and combined with suitable strategies for the discretization in space and time.\r\n\r\nIn view of a useful coupling with the element independent contact description, a trilinear surface oriented hybrid shell element is derived on the basis of the 7-parameter shell model by Büchter and Ramm (1992). Additionally, a trilinear geometric nonlinear brick element based on the principle of Hu-Washizu is devised. Numerical tests demonstrate the performance of both element formulations.\r\n\r\nFor the discretization in time, two implicit time integration algorithms are used. In addition to the existing \"Generalized-α\"-Method especially the \"Generalized-Energy-Momentum-Method\" is applied. The latter is proven to be unconditionally stable in all performed numerical analyses.\r\n\r\nThe essential part of this thesis is the extension of the mortar contact formulation presented by Hüeber and Wohlmuth (2005) to the geometrically nonlinear regime. Introducing continuously approximated Lagrange Multipliers, physically representing the contact pressure, the geometric impenetrability condition is formulated in a weak, integral sense. Using dual shape functions (Wohlmuth (2000)) for the interpolation of the Lagrange Multipliers allows for a nodal decoupling of the geometric constraints. The combination with an active set strategy results in an algorithm which allows for elimination of the discrete nodal values of the Lagrange Multipliers. They can be easily recovered from the displacements in a variational consistent way. In contrast to many other formulations, the resulting contact algorithm combines two main advantages: Only the discrete nodal displacements appear as primal unknowns, thereby the size of the system of equations to be solved remains constant; there is no need for any user defined paramters like a penalty parameter.\r\n\r\nDetailed numerical analyses of dynamic contact problems illustrate the necessity of additional, algorithmic energy-conserving strategies. The \"Velocity-Update\"-method by Laursen and Love (2002) is characterized by the fact that it guarantees the exact conservation of energy while simultaneously satisfying the geometric impenetrability condition. This method is revised according to the presented contact formulation and generalized for combination with the \"Generalized-Energy- Momentum-Method\".\r\n\r\nNumerical examples are investigated to analyze and judge the effectiveness of the proposed solution strategy.", "doi" : "10.18419/opus-263", "bibtexKey": "hartmann2007kontaktanalyse" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2e0b105a5bbdfcfd0c289e25261963ab5/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","article","FE" ], "intraHash" : "e0b105a5bbdfcfd0c289e25261963ab5", "interHash" : "3a558ea1eb0580fdb9fd452914bfba87", "label" : "A generalization of the method of incompatible modes", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:57", "changeDate" : "2021-03-09 12:40:57", "count" : 1, "pub-type": "article", "journal": "International Journal for Numerical Methods in Engineering", "year": "2007", "url": "", "author": [ "Manfred Bischoff","Ignacio Romero" ], "authors": [ {"first" : "Manfred", "last" : "Bischoff"}, {"first" : "Ignacio", "last" : "Romero"} ], "volume": "69","pages": "1851-1868","abstract": "A generalization of the classical method of incompatible modes is presented, containing the original formulation as a special case. The method constitutes a class of finite elements which is equivalent to the class of enhanced assumed strain elements, yet based on a pure displacement formulation.", "doi" : "10.1002/nme.1830", "bibtexKey": "bischoff2007generalization" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2221f9056be106e0278042a5a4e7acb5b/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","article","FE" ], "intraHash" : "221f9056be106e0278042a5a4e7acb5b", "interHash" : "b07b7058d45c32d7c4720d9df86911e8", "label" : "Incompatible Bubbles: A non-conforming finite element formulation for linear elasticity", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:57", "changeDate" : "2021-03-09 12:40:57", "count" : 1, "pub-type": "article", "journal": "Computer Methods in Applied Mechanics and Engineering", "year": "2007", "url": "", "author": [ "Ignacio Romero","Manfred Bischoff" ], "authors": [ {"first" : "Ignacio", "last" : "Romero"}, {"first" : "Manfred", "last" : "Bischoff"} ], "volume": "196","pages": "1662-1672","abstract": "A non-conforming finite element formulation, the Incompatible Bubbles method, is proposed for the problem of linear elasticity. As the classical Incompatible Modes method, the proposed formulation is based on an enrichment of the Galerkin solution space with non-conforming functions, the incompatible bubbles. In fact, the two formulations coincide in the particular case of non-distorted meshes. The advantage of the new formulation is that by a careful choice of the bubbles some of the \"variational crimes\" of the classical method become unnecessary for convergence, as the analysis reveals. Also, the relationship of the proposed method with more recent subgrid scale finite element formulations is investigated. Numerical examples illustrating the performance of the method are provided.", "doi" : "10.1016/j.cma.2006.09.010", "bibtexKey": "romero2007incompatible" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/21ad97fa80568b81adad5ad22149e69be/ibb-publication", "tags" : [ "FE","book","from:maltevonscheven","ibb" ], "intraHash" : "1ad97fa80568b81adad5ad22149e69be", "interHash" : "3b8bc43be1ea9250f9c946c90a26867b", "label" : "Schalen - effizientes Tragverhalten und natürliche Elegnz.", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:54", "changeDate" : "2021-03-10 15:29:54", "count" : 1, "pub-type": "incollection", "publisher":"'Beiträge zur Geschichte des Bauingenieurwesens 12: Ingenieurarbeit'. E. Schunck (Hrsg.), TU München", "year": "2002", "url": "", "author": [ "Ekkehard Ramm" ], "authors": [ {"first" : "Ekkehard", "last" : "Ramm"} ], "bibtexKey": "ramm2002schalen" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/28e11932acdb1dcd4a2b2a79527aeaadc/ibb-publication", "tags" : [ "FE","from:maltevonscheven","ibb","phdthesis" ], "intraHash" : "8e11932acdb1dcd4a2b2a79527aeaadc", "interHash" : "bea907308b213c7fb366fbecb0ac8c17", "label" : "Theorie und Numerik einer dreidimensionalen Schalenformulierung", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:53", "changeDate" : "2021-03-24 14:34:19", "count" : 1, "pub-type": "phdthesis", "publisher":"Doktorarbeit, Bericht Nr. 30, Institut für Baustatik, Universität Stuttgart", "year": "1999", "url": "", "author": [ "Manfred Bischoff" ], "authors": [ {"first" : "Manfred", "last" : "Bischoff"} ], "abstract": "The 7-parameter shell model as proposed by Büchter and Ramm (1992) is an extension of conventional shear deformation theories with five degrees of freedom. Application of this model is especially sensible if complete three-dimensional constitutive laws ought to be applied allowing also to solve problems involving large deformations and large strains. Based on a mixed formulation the seventh degree of freedom can be eliminated on the element level. Thus, the numerical effort is only slightly larger compared to `usual' shell elements. The model can consequently also be utilized for analyses of such shell structures, where a conventional shell formulation would be sufficient.\r\n\r\nBüchter and Ramm (1992) describe the 7-parameter shell model along with a finite element formulation. Here, the seventh degree of freedom is introduced on the element level by means of a hybrid-mixed formulation. In the present work the 7-parameter model is derived independent from a finite element formulation. In this context it can be interpreted as semi-discretization of the shell continuum in thickness direction. The decisive difference to most of the conventional shell theories is that this discretization is based on a multifield variational formulation. By this procedure a system of partial differential equations can be obtained, describing the 7-parameter model as a two-dimensional, continuous theory with seven kinematical degrees of freedom per material point of the reference surface.\r\n\r\nIt is also intended to give a physical interpretation of the kinematic and static variables appearing in the model. Here, the main emphasis is put on those quantities, which do not show up in a conventional 5-parameter formulation. The investigations provide some insight into the mechanical behavior of the model. For the linear part of the transverse shear strains a new shear correction factor is proposed, which can reduce the error with respect to the three-dimensional solution in membrane dominated situations. It is shown that the 7-parameter model is `optimal' concerning the number of kinematic and static variables involved. This means that exactly those components are involved which are necessary for a complete three-dimensional material description.\r\n\r\nFinally, a concept for the formulation of efficient finite elements for the 7-parameter model is presented. Here, established methods from the literature are combined with own developments. A special feature of the proposed concept is that a unified formulation for triangular and rectangular elements of arbitrary polynomial order is obtained. In addition, an improvement in the treatment of shells with kinks is proposed. In the course of the present study the concept is realized for linear and quadratic triangular and rectangular elements. The features of the proposed elements are investigated in numerical experiments, including both linear and geometrically and materially non-linear problems.", "doi" : "10.18419/opus-126", "bibtexKey": "bischoff1999theorie" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2fce29a92bb02b950d1c5cba328a9e840/ibb-publication", "tags" : [ "ibb","from:maltevonscheven","article","FE" ], "intraHash" : "fce29a92bb02b950d1c5cba328a9e840", "interHash" : "50299c61b0912405c64b9a164e5d3fa0", "label" : "On algorithmic aspects of deformation dependent loads in nonlinear finite element analysis.", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:52", "changeDate" : "2021-03-09 12:40:52", "count" : 1, "pub-type": "article", "journal": "Zeitschrift für angewandte Mathematik und Mechanik (ZAMM)", "year": "1999", "url": "", "author": [ "D.P. Mok","W.-A. Wall","M. Bischoff","E. Ramm" ], "authors": [ {"first" : "D.P.", "last" : "Mok"}, {"first" : "W.-A.", "last" : "Wall"}, {"first" : "M.", "last" : "Bischoff"}, {"first" : "E.", "last" : "Ramm"} ], "volume": "79","pages": "561-562", "bibtexKey": "mok1999algorithmic" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ec556e179a3d49bf85186a84cf73efe3/ibb-publication", "tags" : [ "FE","from:maltevonscheven","ibb","phdthesis" ], "intraHash" : "ec556e179a3d49bf85186a84cf73efe3", "interHash" : "78e7dbbe29c90bf69ebd3f012a0c33d8", "label" : "Die Technik der reduzierten Basis bei nichtlinearen finiten Element-Berechnungen.", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:48", "changeDate" : "2021-03-24 14:27:29", "count" : 1, "pub-type": "phdthesis", "publisher":"Doktorarbeit, Bericht Nr. 9, Institut für Baustatik, Universität Stuttgart", "year": "1989", "url": "", "author": [ "D. Tao" ], "authors": [ {"first" : "D.", "last" : "Tao"} ], "bibtexKey": "tao1989technik" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c1555868835ae6dd5a71f3db5251bd3d/ibb-publication", "tags" : [ "FE","from:maltevonscheven","ibb","phdthesis" ], "intraHash" : "c1555868835ae6dd5a71f3db5251bd3d", "interHash" : "e7e9f8d6a628be66f6b8fbb71c464b96", "label" : "Theorie und Berechnung nichtlinearer Schwingungen vorgespannter Membrane nach der Methode der Finiten Elemente", "user" : "ibb-publication", "description" : "", "date" : "2021-03-09 13:40:45", "changeDate" : "2021-03-24 12:55:54", "count" : 1, "pub-type": "phdthesis", "publisher":"Doktorarbeit, Bericht 1973, Institut für Baustatik, Universität Stuttgart", "year": "1973", "url": "", "author": [ "Mahmoud El-Masri" ], "authors": [ {"first" : "Mahmoud", "last" : "El-Masri"} ], "bibtexKey": "elmasri1973theorie" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2bdc70a71c235f26a9e59324a1668ba53/itke", "tags" : [ "1992","FE","Finite-Elemente-Methode","elasto-viscoplastic","from:petraheim","gellert","harbord","hybrid","itke","knippers","peer-reviewed" ], "intraHash" : "bdc70a71c235f26a9e59324a1668ba53", "interHash" : "0799d86797eb8e599776cbdb99f338fc", "label" : "A mixed/hybrid FE formulation for solution of elasto-viscoplastic problems", "user" : "itke", "description" : "", "date" : "2020-05-22 14:27:58", "changeDate" : "2020-07-02 11:41:21", "count" : 2, "pub-type": "article", "journal": "Computational Mechanics", "year": "1992", "url": "", "author": [ "R. Harbord","Jan Knippers","M. Gellert" ], "authors": [ {"first" : "R.", "last" : "Harbord"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "M.", "last" : "Gellert"} ], "volume": "9","pages": "173 \u2013 184","abstract": "A mixed/hybrid FE formulation for the solution of elasto-viscoplastic problems is presented. The spatially semi- discretized system of ordinary differential equations is numerically integrated in time by means of a midpoint type algorithm. Stability considerations are discussed and conditions for its maintenance are established. Illustrative numerical examples demonstrate the ability of the proposed method to reproduce elasto-viscoplastic behaviour. Comparison with known results is also made.", "language" : "eng", "doi" : "https://doi.org/10.1007/BF00350184", "bibtexKey": "harbordmixedhybrid" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ccea6301aadb33d95ce10d2efad12292/itke", "tags" : [ "1994","FE","Finite-Element-Methode","bending","dynamic","elasto-viscoplastic","from:petraheim","harbord","hybrid","itke","knippers","mixed/hybrid","peer-reviewed" ], "intraHash" : "ccea6301aadb33d95ce10d2efad12292", "interHash" : "dee0c65c50b20a097088dbaf431faa47", "label" : "A mixed/hybrid FE formulation for solution of elasto-viscoplastic problems, Part II : dynamic loading conditions and bending problems", "user" : "itke", "description" : "", "date" : "2020-05-22 14:27:58", "changeDate" : "2020-07-02 11:37:45", "count" : 2, "pub-type": "article", "journal": "Computational Mechanics", "year": "1994", "url": "", "author": [ "J. Knippers","R Harbord" ], "authors": [ {"first" : "J.", "last" : "Knippers"}, {"first" : "R", "last" : "Harbord"} ], "volume": "13","pages": "231- 240","abstract": "A mixed/hybrid FE formulation for the solution of elasto-viscoplastic problems under dynamic loading conditions is presented. The constitutive equations under considerations are those of Chaboche. The spatially semi-discretized system of ordinary differential equations is numerically integrated in time by means of a midpoint type algorithm. A layer-model is developed which enables the application of the proposed methods in shell or plate theory. Numerical examples demonstrate the efficiency of the proposed method.", "doi" : "https://doi.org/10.1007/BF00350226", "bibtexKey": "knippers1994mixedhybrid" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/242554a6038d2aa2a437b5172f6ad0ba7/itke", "tags" : [ "1993","FE","Finite-Element-Methode","dynamisch","flächentragwerk","from:petraheim","itke","knippers","viskoplastisch" ], "intraHash" : "42554a6038d2aa2a437b5172f6ad0ba7", "interHash" : "d5fd5f702b3c35bcf80c52a286f9f929", "label" : "Eine gemischt hybride FE Methode für viskoplastische Flächentragwerke unter dynamischen Einwirkungen", "user" : "itke", "description" : "", "date" : "2020-05-22 14:27:58", "changeDate" : "2020-06-08 09:18:12", "count" : 2, "pub-type": "book", "series": "Berichte aus dem Konstruktiven Ingenieurbau","publisher":"Technische Universität Berlin","address":"Berlin", "year": "1993", "url": "", "author": [ "Jan Knippers" ], "authors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "18", "isbn" : "3798315485", "language" : "de", "bibtexKey": "knippers1993gemischt" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d48d437a537123c4a26c7c41d94d5e95/itke", "tags" : [ "membrane","umbrella","advanced","convertible","engineering","2010","fe-simulation","michalski","itke","lienhard","from:petraheim","schöne","tensile","architecture","fe" ], "intraHash" : "d48d437a537123c4a26c7c41d94d5e95", "interHash" : "0438745396a6b8e83db08a2ab4f93566", "label" : "Advanced FE-Simulation of large Convertible Tensile Membrane Umbrellas", "user" : "itke", "description" : "", "date" : "2020-05-22 14:24:19", "changeDate" : "2020-05-22 12:24:19", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the International Symposium of the International Association of Shell and Spatial Structures (IASS) , Spatial Structures Temporary and Permanent","address":"Shanghai, China", "year": "2010", "url": "", "author": [ "S. Schöne","A. Michalski","J. Lienhard" ], "authors": [ {"first" : "S.", "last" : "Schöne"}, {"first" : "A.", "last" : "Michalski"}, {"first" : "J.", "last" : "Lienhard"} ], "editor": [ "Q. et al Zhang" ], "editors": [ {"first" : "Q. et al", "last" : "Zhang"} ], "language" : "eng", "bibtexKey": "schone2010advanced" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d039bb712d0b1d53a47acae39944e3b5/itke", "tags" : [ "2013","ahlquist","bending-active","design","element","fe","finite","form","from:petraheim","hybrid","integral","itke","knippers","lienhard","menges","modelling","strategies","structure" ], "intraHash" : "d039bb712d0b1d53a47acae39944e3b5", "interHash" : "774107cdaf8ca9b6c2a53077d96b929a", "label" : "Finite Element Modelling in Integral Design Strategies of Form- and bending-active Hybrid Structures", "user" : "itke", "description" : "", "date" : "2020-05-22 14:23:59", "changeDate" : "2021-07-09 09:14:32", "count" : 3, "pub-type": "inproceedings", "booktitle": "VI International Conference on Textile Composites and Inflatable Structures","address":"Munich", "year": "2013", "url": "", "author": [ "Julian Lienhard","Sean Ahlquist","Achim Menges","Jan Knippers" ], "authors": [ {"first" : "Julian", "last" : "Lienhard"}, {"first" : "Sean", "last" : "Ahlquist"}, {"first" : "Achim", "last" : "Menges"}, {"first" : "Jan", "last" : "Knippers"} ], "pages": "39 -50", "language" : "eng", "bibtexKey": "lienhard2013finite" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2c39331fdae1a693ff4647ffd7940a308/itke", "tags" : [ "2017","Araliaceae","analyzing","biomechanics","biomimetic","branched","branching","building","bunk","element","fe","finite","from:petraheim","functional","itke","jonas","knippers","masselter","morphology","optimized","plant","ramfication","seitz","simulation","speck","structure" ], "intraHash" : "c39331fdae1a693ff4647ffd7940a308", "interHash" : "3c46fc8a5bfbe2c159923e43f6a236b8", "label" : "How can branched building structures be optimized via analyzing plant branchings? Functional morphology, biomechanics and Finite Element (FE) simulation of Araliaceae ramifications", "user" : "itke", "description" : "", "date" : "2020-05-22 14:23:02", "changeDate" : "2021-07-09 09:19:38", "count" : 2, "pub-type": "inproceedings", "booktitle": "Bionik: Patente aus der Natur. Tagungsbeiträge 8. Bionik-Kongress Bremen","address":"Bremen, Germany", "year": "2017", "url": "", "author": [ "Katharina Bunk","J. M. Seitz","Florian Jonas","Jan Knippers","Thomas Speck","Tom Masselter" ], "authors": [ {"first" : "Katharina", "last" : "Bunk"}, {"first" : "J. 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Functional morphology, biomechanics and Finite Element (FE) simulation of Araliaceae ramifications", "user" : "petraheim", "description" : "", "date" : "2020-05-20 09:31:32", "changeDate" : "2020-06-02 10:07:21", "count" : 2, "pub-type": "inproceedings", "booktitle": "Bionik: Patente aus der Natur. Tagungsbeiträge 8. Bionik-Kongress Bremen","address":"Bremen, Germany", "year": "2017", "url": "", "author": [ "Katharina Bunk","J. M. Seitz","Florian Jonas","Jan Knippers","Thomas Speck","Tom Masselter" ], "authors": [ {"first" : "Katharina", "last" : "Bunk"}, {"first" : "J. M.", "last" : "Seitz"}, {"first" : "Florian", "last" : "Jonas"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "Thomas", "last" : "Speck"}, {"first" : "Tom", "last" : "Masselter"} ], "editor": [ " Kesel"," Zehren" ], "editors": [ {"first" : "", "last" : "Kesel"}, {"first" : "", "last" : "Zehren"} ], "pages": "40-48", "language" : "eng", "bibtexKey": "bunk2017branched" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2d48d437a537123c4a26c7c41d94d5e95/petraheim", "tags" : [ "2010","advanced","architecture","convertible","engineering","fe","fe-simulation","itke","lienhard","membrane","michalski","schöne","tensile","umbrella" ], "intraHash" : "d48d437a537123c4a26c7c41d94d5e95", "interHash" : "0438745396a6b8e83db08a2ab4f93566", "label" : "Advanced FE-Simulation of large Convertible Tensile Membrane Umbrellas", "user" : "petraheim", "description" : "", "date" : "2020-05-18 09:02:55", "changeDate" : "2020-06-02 10:10:17", "count" : 2, "pub-type": "inproceedings", "booktitle": "Proceedings of the International Symposium of the International Association of Shell and Spatial Structures (IASS) , Spatial Structures Temporary and Permanent","address":"Shanghai, China", "year": "2010", "url": "", "author": [ "S. Schöne","A. Michalski","J. Lienhard" ], "authors": [ {"first" : "S.", "last" : "Schöne"}, {"first" : "A.", "last" : "Michalski"}, {"first" : "J.", "last" : "Lienhard"} ], "editor": [ "Q. et al Zhang" ], "editors": [ {"first" : "Q. et al", "last" : "Zhang"} ], "language" : "eng", "bibtexKey": "schone2010advanced" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2ccea6301aadb33d95ce10d2efad12292/petraheim", "tags" : [ "1994","FE","Finite-Element-Methode","bending","dynamic","elasto-viscoplastic","harbord","hybrid","itke","knippers","mixed/hybrid","peer-reviewed" ], "intraHash" : "ccea6301aadb33d95ce10d2efad12292", "interHash" : "dee0c65c50b20a097088dbaf431faa47", "label" : "A mixed/hybrid FE formulation for solution of elasto-viscoplastic problems, Part II : dynamic loading conditions and bending problems", "user" : "petraheim", "description" : "", "date" : "2020-05-11 14:47:53", "changeDate" : "2020-07-02 11:38:18", "count" : 2, "pub-type": "article", "journal": "Computational Mechanics", "year": "1994", "url": "", "author": [ "J. Knippers","R Harbord" ], "authors": [ {"first" : "J.", "last" : "Knippers"}, {"first" : "R", "last" : "Harbord"} ], "volume": "13","pages": "231- 240","abstract": "A mixed/hybrid FE formulation for the solution of elasto-viscoplastic problems under dynamic loading conditions is presented. The constitutive equations under considerations are those of Chaboche. The spatially semi-discretized system of ordinary differential equations is numerically integrated in time by means of a midpoint type algorithm. A layer-model is developed which enables the application of the proposed methods in shell or plate theory. Numerical examples demonstrate the efficiency of the proposed method.", "language" : "eng", "doi" : "https://doi.org/10.1007/BF00350226", "bibtexKey": "knippers1994mixedhybrid" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/2bdc70a71c235f26a9e59324a1668ba53/petraheim", "tags" : [ "1992","FE","Finite-Elemente-Methode","elasto-viscoplastic","gellert","harbord","hybrid","itke","knippers","peer-reviewed" ], "intraHash" : "bdc70a71c235f26a9e59324a1668ba53", "interHash" : "0799d86797eb8e599776cbdb99f338fc", "label" : "A mixed/hybrid FE formulation for solution of elasto-viscoplastic problems", "user" : "petraheim", "description" : "", "date" : "2020-05-11 14:43:33", "changeDate" : "2020-07-02 11:42:11", "count" : 2, "pub-type": "article", "journal": "Computational Mechanics", "year": "1992", "url": "", "author": [ "R. Harbord","Jan Knippers","M. Gellert" ], "authors": [ {"first" : "R.", "last" : "Harbord"}, {"first" : "Jan", "last" : "Knippers"}, {"first" : "M.", "last" : "Gellert"} ], "volume": "9","pages": "173 \u2013 184","abstract": "A mixed/hybrid FE formulation for the solution of elasto-viscoplastic problems is presented. The spatially semi- discretized system of ordinary differential equations is numerically integrated in time by means of a midpoint type algorithm. Stability considerations are discussed and conditions for its maintenance are established. Illustrative numerical examples demonstrate the ability of the proposed method to reproduce elasto-viscoplastic behaviour. Comparison with known results is also made.", "language" : "eng", "doi" : "https://doi.org/10.1007/BF00350184", "bibtexKey": "harbordmixedhybrid" } , { "type" : "Publication", "id" : "https://puma.ub.uni-stuttgart.de/bibtex/242554a6038d2aa2a437b5172f6ad0ba7/petraheim", "tags" : [ "1993","FE","Finite-Element-Methode","dynamisch","flächentragwerk","itke","knippers","viskoplastisch" ], "intraHash" : "42554a6038d2aa2a437b5172f6ad0ba7", "interHash" : "d5fd5f702b3c35bcf80c52a286f9f929", "label" : "Eine gemischt hybride FE Methode für viskoplastische Flächentragwerke unter dynamischen Einwirkungen", "user" : "petraheim", "description" : "", "date" : "2020-05-11 12:56:13", "changeDate" : "2020-06-08 09:18:35", "count" : 2, "pub-type": "book", "series": "Berichte aus dem Konstruktiven Ingenieurbau","publisher":"Technische Universität Berlin","address":"Berlin", "year": "1993", "url": "", "author": [ "Jan Knippers" ], "authors": [ {"first" : "Jan", "last" : "Knippers"} ], "volume": "18", "isbn" : "3798315485", "language" : "de", "bibtexKey": "knippers1993gemischt" } ] }