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Добірка наукової літератури з теми "Finite Element Tearing and Interconnecting"

Автор: Grafiati
Опубліковано: 6 вересня 2023

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Статті в журналах з теми "Finite Element Tearing and Interconnecting"

1

Zhu, Xue-Feng, Zheng-Dong Ma, and Ping Hu. "Nonconforming isogeometric analysis for trimmed CAD geometries using finite-element tearing and interconnecting algorithm." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 231, no. 8 (January 23, 2017): 1371–89. http://dx.doi.org/10.1177/0954406216688491.

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Inspired by the nonconforming finite-element method, and with the intention of resolving difficulties in constructing analysis-suitable geometry in isogeometric analysis, an isogeometric method based on multipoint constraints and a finite-element tearing and interconnecting algorithm, called nonconforming isogeometric analysis, is proposed. The major purpose of the algorithm is to enable the application of isogeometric analysis directly to trimmed CAD geometries. The basic idea is to build a constraint equation system about the control points belonging to different trimmed spline patches and the normal derivatives of the geometric functions at properly selected interface points, and then to enforce the control variables and the normal derivatives of the displacement functions to obey the constraint equation system using the isoparametric concept. A spline version of the finite-element tearing and interconnecting method is then employed to obtain numerical solutions. Examples provided in this paper demonstrate the accuracy and efficiency of the new method.
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2

González, José A., and K. C. Park. "A simple explicit-implicit finite element tearing and interconnecting transient analysis algorithm." International Journal for Numerical Methods in Engineering 89, no. 10 (October 14, 2011): 1203–26. http://dx.doi.org/10.1002/nme.3281.

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3

MAGOULÈS, FRÉDÉRIC, KARL MEERBERGEN, and JEAN-PIERRE COYETTE. "APPLICATION OF A DOMAIN DECOMPOSITION METHOD WITH LAGRANGE MULTIPLIERS TO ACOUSTIC PROBLEMS ARISING FROM THE AUTOMOTIVE INDUSTRY." Journal of Computational Acoustics 08, no. 03 (September 2000): 503–21. http://dx.doi.org/10.1142/s0218396x00000297.

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The Finite Element Tearing and Interconnecting method for the Helmholtz equation is a recent nonoverlapping domain decomposition method for solving linear systems arising from the finite element discretization of Helmholtz problems in bounded domains. This method was validated on two-dimensional external problems with first-order absorbing boundary conditions. The purpose of this paper is to study the robustness and efficiency of iterative methods for the solution of the associated interface problem for three-dimensional interior problems arising from the automotive industry.
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4

Farhat, Charbel, and Francois-Xavier Roux. "A method of finite element tearing and interconnecting and its parallel solution algorithm." International Journal for Numerical Methods in Engineering 32, no. 6 (October 25, 1991): 1205–27. http://dx.doi.org/10.1002/nme.1620320604.

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5

Langer, U., and C. Pechstein. "Coupled Finite and Boundary Element Tearing and Interconnecting solvers for nonlinear potential problems." ZAMM 86, no. 12 (December 1, 2006): 915–31. http://dx.doi.org/10.1002/zamm.200610294.

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6

Yang, Ming-Lin, and Xin-Qing Sheng. "On the Finite Element Tearing and Interconnecting Method for Scattering by Large 3D Inhomogeneous Targets." International Journal of Antennas and Propagation 2012 (2012): 1–6. http://dx.doi.org/10.1155/2012/898247.

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The finite element tearing and interconnecting method (FETI) is applied to compute scattering by large 3D inhomogeneous targets. Two algorithms of FETI have been implemented for 3D scattering. The performance of these two FETI algorithms has been investigated in detail, particularly for large inhomogeneous targets. Numerical experiments show that the performance of FETI relies on the style of domain decomposition and inhomogeneity, which has not been carefully studied before. A trick for improving convergence of FETI is presented for inhomogeneous targets.
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7

Sadeq Obaid, Abdulrahman, and Stefanie Reese. "Proof of Positive Definiteness of FI and Extended Finite Element Tearing and Interconnecting XFETI." PAMM 9, no. 1 (December 2009): 383–84. http://dx.doi.org/10.1002/pamm.200910165.

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8

Tu, Xuemin, and Jing Li. "A unified dual-primal finite element tearing and interconnecting approach for incompressible Stokes equations." International Journal for Numerical Methods in Engineering 94, no. 2 (December 21, 2012): 128–49. http://dx.doi.org/10.1002/nme.4439.

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9

Raibi, Ouafaa, and Abdelilah Makrizi. "Finite element tearing and interconnecting-1 method for the solution of the topology optimisation problem." International Journal of Mathematical Modelling and Numerical Optimisation 12, no. 2 (2022): 141. http://dx.doi.org/10.1504/ijmmno.2022.122086.

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Raibi, Ouafaa, and Abdelilah Makrizi. "Finite element tearing and interconnecting-1 method for the solution of the topology optimisation problem." International Journal of Mathematical Modelling and Numerical Optimisation 12, no. 2 (2022): 141. http://dx.doi.org/10.1504/ijmmno.2022.10045638.

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Більше джерел

Дисертації з теми "Finite Element Tearing and Interconnecting"

1

Marchand, Renier Gustav. "Finite element tearing and interconnecting for the electromagnetic vector wave equation in two dimensions." Thesis, Stellenbosch : University of Stellenbosch, 2007. http://hdl.handle.net/10019.1/2471.

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Анотація:
Thesis (MScEng (Electrical and Electronic Engineering))--University of Stellenbosch, 2007.
The finite element tearing and interconnect(FETI) domain decomposition(DD) method is investigated in terms of the 2D transverse electric(TEz) finite element method(FEM). The FETI is for the first time rigorously derived using the weighted residual framework from which important insights are gained. The FETI is used in a novel way to implement a total-/scattered field decomposition and is shown to give excellent results. The FETI is newly formulated for the time domain(FETI-TD), its feasibility is tested and it is further formulated and tested for implementation on a distributed computer architecture.
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2

Leistner, Michael Christopher Dominik [Verfasser], Daniel [Akademischer Betreuer] Rixen, Daniel [Gutachter] Rixen, and Pierre [Gutachter] Gosselet. "Dual Domain Decomposition Methods in Structural Dynamics : Efficient Strategies for Finite Element Tearing and Interconnecting / Michael Christopher Dominik Leistner ; Gutachter: Daniel Rixen, Pierre Gosselet ; Betreuer: Daniel Rixen." München : Universitätsbibliothek der TU München, 2019. http://d-nb.info/1181326354/34.

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3

Marchand, Renier Gustav. "Fine element tearing and interconnecting for the electromagnetic vector wave equation in two dimensions /." Link to online version, 2007. http://hdl.handle.net/10019/363.

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4

Bahadursha, Venkata Rama Lakshmi Preeethi. "Tearing of Styrene Butadiene Rubber using Finite Element Analysis." University of Akron / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=akron1431029910.

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5

Mbavhalelo, M., and G. Oliver. "The development and implementation of finite element analysis techniques in the design of press tooling." Journal for New Generation Sciences, Vol 7, Issue 3: Central University of Technology, Free State, Bloemfontein, 2009. http://hdl.handle.net/11462/541.

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Published Article
Rapid and reliable methods for component development and economic manufacturing layout are today crucial factors for the application of press tooling techniques in mass production of automotive industry components. The use of Finite Element Analysis (FEA) based forming simulation can provide a more detailed insight into the real behaviour of a structure. An LS-DYNA finite element model was developed to analyse the material behaviour during the piercing process of a drainage hole for a shock absorber seat. The simulation is intended to simulate tearing that occurs during the manufacturing stage. Once the current punch produces the observed tearing we can modify the punch to eliminate the problem.
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6

Phillion, André. "Hot tearing and constitutive behaviour of semi-solid aluminum alloys." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/207.

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Анотація:
The occurrence of hot tearing during solidification is one of the major factors influencing both the quality and productivity of aluminum castings. In order to reduce the formation of hot tears, quantitative information regarding both hot tearing formation and semi-solid deformation is essential. In this study, the mechanisms of hot tearing and semi-solid deformation have been investigated via two novel techniques: x-ray micro-tomography on material deformed in the semi-solid region, and development of a three phase microstructural model based on a geometry derived from a Voronoi diagram with rounded corners and porosity. Numerical techniques were utilized to quantify both the size evolution and orientation of internal damage relative to void growth. In order to conduct the above research, a new semi-solid tensile deformation methodology was devised which uses a two thermocouple control technique to enable accurate measurement of semi-solid tensile strength and ductility. The experimental work was conducted on the aluminum – magnesium alloy AA5182 in the as-cast and hot isostatic pressing (HIP) states. The x-ray micro-tomography technique was used to observe that semi-solid deformation is accommodated by internal damage via growth of as-cast porosity and the nucleation of new damage-based voids. As the volume fraction of damage increases, the growth of voids occurs in an orientation perpendicular to the loading direction, both through expansion within the grain boundary liquid and via coalescence between voids. The damage then localizes, causing failure. The finite element semi-solid microstructural model was used to explore the effects of fraction solid, fraction porosity, and grain size on semi-solid constitutive behaviour. The simulations revealed that increased grain size and fraction porosity lead to a reduction in flow stress for a given fraction solid. Furthermore, local strain accumulation was linked to hot tearing, since strain localizes in the liquid very early in the deformation process. Based on the model predictions, a new constitutive relationship was developed over the range 0.75 < fs < 0.95. Together, these two techniques have provided powerful new insight, such as the critical role played by as-cast porosity, on the phenomena of hot tearing and semi-solid deformation in aluminum alloys.
Applied Science, Faculty of
Materials Engineering, Department of
Graduate
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7

Phillion, Andre. "Hot tearing and constitutive behaviour of semi-solid aluminum alloys." Thesis, University of British Columbia, 2007. http://hdl.handle.net/2429/207.

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Анотація:
The occurrence of hot tearing during solidification is one of the major factors influencing both the quality and productivity of aluminum castings. In order to reduce the formation of hot tears, quantitative information regarding both hot tearing formation and semi-solid deformation is essential. In this study, the mechanisms of hot tearing and semi-solid deformation have been investigated via two novel techniques: x-ray micro-tomography on material deformed in the semi-solid region, and development of a three phase microstructural model based on a geometry derived from a Voronoi diagram with rounded corners and porosity. Numerical techniques were utilized to quantify both the size evolution and orientation of internal damage relative to void growth. In order to conduct the above research, a new semi-solid tensile deformation methodology was devised which uses a two thermocouple control technique to enable accurate measurement of semi-solid tensile strength and ductility. The experimental work was conducted on the aluminum – magnesium alloy AA5182 in the as-cast and hot isostatic pressing (HIP) states. The x-ray micro-tomography technique was used to observe that semi-solid deformation is accommodated by internal damage via growth of as-cast porosity and the nucleation of new damage-based voids. As the volume fraction of damage increases, the growth of voids occurs in an orientation perpendicular to the loading direction, both through expansion within the grain boundary liquid and via coalescence between voids. The damage then localizes, causing failure. The finite element semi-solid microstructural model was used to explore the effects of fraction solid, fraction porosity, and grain size on semi-solid constitutive behaviour. The simulations revealed that increased grain size and fraction porosity lead to a reduction in flow stress for a given fraction solid. Furthermore, local strain accumulation was linked to hot tearing, since strain localizes in the liquid very early in the deformation process. Based on the model predictions, a new constitutive relationship was developed over the range 0.75 < fs < 0.95. Together, these two techniques have provided powerful new insight, such as the critical role played by as-cast porosity, on the phenomena of hot tearing and semi-solid deformation in aluminum alloys.
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8

MADDALA, PRANAY RAJ REDDY. "Investigation of Polymer packaging films behavior subjected to tension and tearing." Thesis, Blekinge Tekniska Högskola, Institutionen för maskinteknik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:bth-15002.

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The course of polymer film functioning has been a crucial concern in the advent of packaging technology. The thesis project aims towards obtaining an understanding of mechanical properties for a class of these materials, namely LDPE and PET. A constitutive understanding of this behavior in the case of LDPE is acquired through incorporating a plastic stress strain relationship in an iterative approach with focus put on the sensitivity of a few parameters by following a simple linear curve-fit technique in a way that the global as well as the local response are predictable. FE-models also developed in this way are validated with experimental data. An inverse analysis testing validity or usefulness of DIC technique in identifying a material model is done and some discussions are drawn towards this area. A relative numerical study with respect to experimentally obtained global response for tearing of these polymers is done through use of a similar material model developed from tensile tests and the challenges faced in this area have been addressed.
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9

Wasylyk, Andrew Paul. "New insights into the competition between ductile tearing and plastic collapse in 304(L) stainless steel components." Thesis, University of Manchester, 2013. https://www.research.manchester.ac.uk/portal/en/theses/new-insights-into-the-competition-between-ductile-tearing-and-plastic-collapse-in-304l-stainless-steel-components(e6692805-e5c8-4fb0-a351-7725579eeb96).html.

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Structural integrity assessment of nuclear components assessed using the R6 Failure Assessment Diagram approach requires an understanding of the limiting condition in terms of both fracture and plastic collapse. For ductile materials, such as stainless steels used for nuclear components, including the primary pipe-work of a Pressurised Water Reactor (PWR), the limiting condition defined by plastic collapse is likely to occur prior to the initiation of fracture. This is due to the relatively low yield stress of the material and the high fracture toughness. If this is the case, structural integrity may be solely assessed on plastic collapse criteria, with little or no reference to fracture toughness; thus considerably simplifying the assessment procedure, whilst maintaining the integrity of the plant. Nevertheless, an in-depth understanding of fracture under plastic collapse conditions is required to make a robust case for single parameter assessments based on a plastic collapse criterion alone. The challenge in this project lay in understanding and predicting ductile fracture initiation under large-scale yielding conditions, i.e. outside the normal validity limits of conventional elastic-plastic fracture mechanics as plastic collapse conditions are achieved. The approach developed in this research has explored three fracture assessment methods: (a) two parameter fracture mechanics based on the J-integral and a refined Q-parameter calculated closer to the crack-tip under widespread plasticity than is conventionally the case, (b) two local approach methods based on critical void growth ratio defined by Rice and Tracey, and (c) a local approach method based on the critical work of fracture. All three methodologies were found to adequately describe failure across a range of constraint conditions. The fracture toughness constraint dependence of 304(L) stainless steel was studied experimentally and analytically. Significant constraint loss was shown to occur in nominally high constraint fracture toughness specimens due to extensive plastic deformation at fracture initiation. Furthermore, significant fracture toughness constraint dependence was observed experimentally. An analytical method using local approach criteria was developed to predict high constraint fracture toughness, required for structural integrity assessments, and to quantify the constraint dependence fracture toughness as a function of two parameter fracture mechanics based on the J-integral and the refined Q-parameter. The influence of constraint on the prediction of failure in a stainless steel pipe containing a fully circumferential crack of various depths was investigated analytically for a range of loading conditions. A refined constraint independent failure assessment methodology was developed using local approach analyses. Using this methodology, the pipe component was shown to consistently fail by plastic collapse irrespective of the crack depth or loading condition. The conservatism of the conventional structural integrity assessment was quantified and shown to vary with crack depth and with loading conditions. This research has suggested that failure in a 304(L) stainless steel pipe will be by plastic collapse prior to ductile initiation for a limited range of defects and loading conditions. Further analytical studies and experimental work will be required to demonstrate whether this observation is general for a wider range of defects and loading conditions.
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10

Hatipoglu, Hasan Ali. "Experimental And Numerical Investigation Of Sheet Metal Hydroforming (flexforming) Process." Master's thesis, METU, 2007. http://etd.lib.metu.edu.tr/upload/12608755/index.pdf.

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Sheet metal hydroforming(flexforming) is a process generally used in the manufacturing of aerospace parts in which a rubber diaphragm forms the sheet on a die with the help pressurized fluid and by this aspect it is different from the conventional stamping process. Some defects occur in the parts that are manufactured by this method and they are not different from the general sheet metal forming defects. Wrinkling, tearing and springback are among those defects. Variety of parts makes difficult to encounter these defects arising the detailed investigation of this process. In this work, the flexforming process was modeled by finite element method in order to investigate the operation windows of the problem. Various two and three-dimensional models were established with and without diaphragm, using explicit and implicit approach for time integration and using solid and shell elements for the blank. Using the material Aluminum 2024-T3 alclad sheet alloy, three basic experiments were conducted: Bending of a straight flange specimen, bending of a contoured flange specimen and bulging of a circular specimen. By these experiments the effects of blank thickness, die bend radius and forming pressure have been investigated. Experimental results were compared with finite element results to verify the computational models. Then, three selected aerospace sheet parts were analyzed and success of the model in the real life applications is proved.
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Книги з теми "Finite Element Tearing and Interconnecting"

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Pechstein, Clemens. Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-23588-7.

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2

C, Newman J., Bigelow C. A, and Langley Research Center, eds. Three-dimensional CTOA and constraint effects during stable tearing in a thin-sheet material. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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3

C, Newman J., Bigelow C. A, and Langley Research Center, eds. Three-dimensional CTOA and constraint effects during stable tearing in a thin-sheet material. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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4

Pechstein, Clemens. Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems. Springer, 2015.

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5

Pechstein, Clemens. Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems. Springer London, Limited, 2012.

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6

Pechstein, Clemens. Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems. Springer, 2012.

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7

Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems Lecture Notes in Computational Science and Engineering. Springer, 2012.

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8

Three-dimensional CTOA and constraint effects during stable tearing in a thin-sheet material. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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9

Three-dimensional CTOA and constraint effects during stable tearing in a thin-sheet material. Hampton, Va: National Aeronautics and Space Administration, Langley Research Center, 1995.

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Частини книг з теми "Finite Element Tearing and Interconnecting"

1

Pacheco, Douglas R. Q., and Olaf Steinbach. "Space-Time Finite Element Tearing and Interconnecting Domain Decomposition Methods." In Domain Decomposition Methods in Science and Engineering XXVI, 479–86. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-030-95025-5_51.

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Pechstein, Clemens. "Preliminaries." In Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems, 1–61. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23588-7_1.

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Pechstein, Clemens. "One-Level FETI/BETI Methods." In Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems, 63–155. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23588-7_2.

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Pechstein, Clemens. "Multiscale Problems." In Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems, 157–213. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23588-7_3.

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Pechstein, Clemens. "Unbounded Domains." In Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems, 215–46. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23588-7_4.

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Pechstein, Clemens. "Dual-Primal Methods." In Finite and Boundary Element Tearing and Interconnecting Solvers for Multiscale Problems, 247–81. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-23588-7_5.

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HOEFLER, A., and H. SCHULZ. "FINITE ELEMENT ANALYSIS OF DUCTILE TEARING IN PRESSURIZED COMPONENETS." In Current Advances in Mechanical Design and Production III, 19–26. Elsevier, 1986. http://dx.doi.org/10.1016/b978-0-08-033440-0.50010-5.

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Тези доповідей конференцій з теми "Finite Element Tearing and Interconnecting"

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Chen, Hang, Chenyang Sun, Quanquan Wang, and Ting Wan. "Finite Element Tearing and Interconnecting Modeling of Finite Metasurfaces." In 2022 International Applied Computational Electromagnetics Society Symposium (ACES-China). IEEE, 2022. http://dx.doi.org/10.1109/aces-china56081.2022.10064881.

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Kezhong Zhao and Jin-Fa Lee. "Modeling complex EMC problems using finite element tearing and interconnecting algorithm." In 2006 IEEE International Symposium on Electromagnetic Compatibility, 2006. EMC 2006. IEEE, 2006. http://dx.doi.org/10.1109/isemc.2006.1706376.

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Gao, Hong-Wei, Xin-Qing Sheng, and Alireza Baghai-Wadji. "Electromagnetic Scattering by Large Inhomogeneous 3D Targets Utilizing Finite Element Tearing and Interconnecting Method." In 2012 Sixth International Conference on Electromagnetic Field Problems and Applications (ICEF). IEEE, 2012. http://dx.doi.org/10.1109/icef.2012.6310307.

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Wang Yao, Jian-Ming Jin, and Philip T. Krein. "Analysis of electromechanical problems using the dual-primal finite element tearing and interconnecting method." In 2012 IEEE Power and Energy Conference at Illinois (PECI). IEEE, 2012. http://dx.doi.org/10.1109/peci.2012.6184595.

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Du, L., Ru Shan Chen, J. L. Yang, and Z. H. Fan. "Finite-element time-domain method combined with finite-element tearing and interconnecting algorithm and its application for electromagnetic band gap structure." In 2008 Asia Pacific Microwave Conference. IEEE, 2008. http://dx.doi.org/10.1109/apmc.2008.4958000.

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Du, L., Y. Yang, Z. B. Ye, J. L. Yang, and R. S. Chen. "Time-Domain Analysis of Photonic Band Gap Structure by a Finite-Element Tearing and Interconnecting Algorithm." In 2008 IEEE MTT-S International Microwave Workshop Series on Art of Miniaturizing RF and Microwave Passive Components (IMWS). IEEE, 2008. http://dx.doi.org/10.1109/imws.2008.4782305.

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Xue, M. F., and J. M. Jin. "A preconditioned dual-primal finite element tearing and interconnecting method for solving 3D time-harmonic Maxwell's equations." In 2014 International Conference on Electromagnetics in Advanced Applications (ICEAA). IEEE, 2014. http://dx.doi.org/10.1109/iceaa.2014.6903822.

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Yujia Li and Jian-Ming Jin. "A Vector Dual-Primal Finite Element Tearing and Interconnecting Method for Solving 3-D Large-Scale Electromagnetic Problems." In 2006 IEEE Antennas and Propagation Society International Symposium. IEEE, 2006. http://dx.doi.org/10.1109/aps.2006.1711497.

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Yao, Wang, and Jian-Ming Jin. "Simulation of LWD tool response using the dual-primal finite element tearing and interconnecting method incorporated with tree-co-tree splitting." In 2012 IEEE Antennas and Propagation Society International Symposium and USNC/URSI National Radio Science Meeting. IEEE, 2012. http://dx.doi.org/10.1109/aps.2012.6349143.

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10

Zsaki, Attila, and Marius Paraschivoiu. "A Non-Overlapping Domain Decomposition Method for the Stokes Problem." In ASME 2002 Joint U.S.-European Fluids Engineering Division Conference. ASMEDC, 2002. http://dx.doi.org/10.1115/fedsm2002-31368.

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Анотація:
A domain decomposition method for the Stokes problem using Lagrange multipliers is described. The dual system associated with the Lagrange multipliers is solved based on an iterative procedure using the two-level finite element tearing and interconnecting (FETI) method. Numerical tests are performed by solving the driven cavity problem. An analysis of the number of outer iterations and an evaluation of the cost of the inner iterations are reported. Comparison with the well-known Uzawa algorithm shows a reduction in the floating point operations count of the inner iterations while achieving the same number of outer iterations.
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Звіти організацій з теми "Finite Element Tearing and Interconnecting"

1

Li, Yaning, Thomasz Wierzbicki, Michael A. Sutton, Junhui Yan, and Xiaomin Deng. Mixed Mode Stable Tearing of Thin Sheet Al 6061-T6 Specimens: Experimental Measurements and Finite Element Simulations using a Modified Mohr-Coulomb Fracture Criterion. Fort Belvoir, VA: Defense Technical Information Center, November 2010. http://dx.doi.org/10.21236/ada531956.

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2

Shim, D. J., Gery Wilkowski, Mohammed Uddin, Sureshkumar Kalyanam, and P. Mincer. PR-276-094509-R01 Develop Fracture Initiation Criteria for High-Strength Steel Line Pipe Phase II. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), August 2013. http://dx.doi.org/10.55274/r0010072.

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This report summarizes the major findings from a PRCI Project on developing fracture initiation criteria for axial flaws (both through-wall and surface flaws) in high-strength line-pipe materials. This work was originally done on the basis to see if improvements were needed for higher-grade steels, but interestingly there were several outcomes that affect predictions for all piping steels. One of the outcomes of this work is a new correlation between Charpy USE and J-R curve for high-strength materials. Although it is based on limited data, it was demonstrated that there is significant difference compared to the existing correlation. Another interesting finding is the effect of the internal patch on burst pressure of axial through-wall-cracked pipe test. Careful experimental and detailed finite element analyses showed patching affects burst pressure by at least 10-percent which affects the leak-rupture boundary. For axial surface-cracked pipes, the effect of crack shape on the crack-driving force was investigated. Finally, it was demonstrated that the actual axial surface-cracked pipe bulging factor is considerably lower than bulging factor empirically derived at Battelle in the 1970s. If past bulging factor is used for subcritical crack growth (e.g., for SCC or fatigue analyses), the crack growth and start of ductile tearing can be significantly overpredicted. Overall, J-T analysis provided the most accurate results when proper crack-driving forces and J-R curves were used (both for axial through-wall-cracked pipe and axial surface-cracked pipe). This report also includes recommendations for future work.
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