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Добірка наукової літератури з теми "Finite element method Computer programs"

Автор: Grafiati

Опубліковано: 4 червня 2021

Оновлено: 29 січня 2023

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Статті в журналах з теми "Finite element method Computer programs"

Agapov, Vladimir P., and Alexey S. Markovich. "Dynamic method for determining critical loads in the PRINS computer program." Structural Mechanics of Engineering Constructions and Buildings 16, no. 5 (December 15, 2020): 380–89. http://dx.doi.org/10.22363/1815-5235-2020-16-5-380-389.

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Relevance. Buckling analysis is important in the design of buildings and structures. It is used in various fields of engineering - mechanical engineering, aircraft and shipbuilding, civil engineering, etc. Until the second half of the twentieth century, mainly analytical methods of buckling were applied in practice. With the appearance of computers, numerical methods, in particular, the finite element analysis, began to prevail. Buckling analysis was implemented in programs of finite element analysis, such as NASTRAN, ANSYS, ABAQUS, ADAMS, DIANA, and others. In view of great responsibility, buckling analysis of structure should be carried out using at least two different programs. However, due to the high cost of software products, not all project organizations are able to have a number of programs. An alternative is to develop programs that can complete buckling analysis using several methods. This would increase the reliability and quality of calculation results. The PRINS computer program has opportunity for buckling analysis using two methods - static and dynamic. The aims of the work - to show the theoretical aspects and practical implementation of the dynamic principle of buckling analysis in buildings and structures using finite element method, as well as to give the algorithm implemented in the PRINS program and the results of verification calculations confirming its reliability. Results. The algorithm presented in this article and implemented in the PRINS computer program allows to determine critical loads using a dynamic buckling criterion. On the basis of numerous verification calculations, it was established that the implemented algorithm was effective for determining critical loads in frame, thin-walled and ribbed plate structures. The use of the PRINS computer program enables to use an alternative method for determining critical loads for a wide class of engineering problems in addition to the classical (static) method.

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Mufti, A. A., G. Tadros, and A. C. Agarwal. "On the use of finite element programs in structural evaluation and development of design charts." Canadian Journal of Civil Engineering 21, no. 5 (October 1, 1994): 797–804. http://dx.doi.org/10.1139/l94-086.

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In many phases of structural design and analytical evaluation, the solution of stress and strain distribution in an elastic continuum is required. Special cases of such problems may range from two-dimensional plane stress or plain strain distribution, plate bending to analysis of fully three-dimensional solids. The finite element programs are often used to predict the critical regions for stress analysis and design. Stresses are generally of greater practical importance than displacements for structural design and evaluation. Most of the finite element computer programs calculate element stresses at the centroids, integration points, or nodes of elements. In this paper, examples of bridge deck analysis are used to illustrate the stress interpretation using the finite element programs. It is demonstrated that the stresses at nodes calculated by some finite element programs violate the equilibrium conditions and do not converge to the correct answers. These calculated stresses at nodes are usually too low and lead to unsafe designs and evaluations. Key words: finite element method, finite element programs, structural analysis, least square smoothing, stress interpolation.

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Maslennikov, A. M., E. A. Kobelev, and N. A. Maslennikov. "Solution of sustainability tasks by finite element method." Вестник гражданских инженеров 17, no. 2 (2020): 68–74. http://dx.doi.org/10.23968/1999-5571-2020-17-2-68-74.

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New functions are proposed to describe the deformed state of rods upon loss of stability for two types of rods with different boundary conditions. To solve stability problems with a kinematic uncertainty number of more than two, it is recommended to reduce solution to a characteristic equation with the further use of computer programs with matrix operations. For this purpose, a stiffness matrix and potential loading matrix were developed for the adopted functions. Following the example of classical displacement method for the mentioned rods, there was developed a table of reactions for single displacements. Several examples are given that illustrate fairly close results to the exact solutions.

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Tin, Trinh Van. "The motion equation of turbine blade by the finite element method." Vietnam Journal of Mechanics 15, no. 4 (December 31, 1997): 42–48. http://dx.doi.org/10.15625/0866-7136/10219.

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In this paper, the finite element method has been applied to deriving the motion equation of turbine blade in coupled bending - bending - torsion vibrations. These equations permit us to develop straightforwardly digital computer programs for studying vibration problems of turbine blades in turbo machinery as well as in other structural dynamic applications.

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Marufiy, A., and E. Rysbekova. "Specific Design Solution for Covering Large Areas With Spatial Metal Truss." Bulletin of Science and Practice 7, no. 12 (December 15, 2021): 160–68. http://dx.doi.org/10.33619/2414-2948/73/22.

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. The relevance of the research results given in the article lies in the need to apply new constructive solutions for large spaces. The purpose of this work is to search for new design solutions for covering large areas with spatial metal trusses. The problems of forming a computational spatial bar finite element model of a steel spatial truss of a dome-shaped radial-ring structure were solved. The calculation of the spatial system was carried out using the finite element method of current computer programs, new constructive solutions for spatial metal trusses were adopted. The stress-strain states of the model from a given load have been determined. The calculation of the spatial system was carried out using the finite element method of current computer programs, new constructive solutions for spatial metal trusses were adopted. The research results can be used in the formation of architectural and structural solutions of a building using a new structural arrangement of the elements of a spatial truss.

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Serrette, R. L. "An introduction to the finite element method using basic programs." Mechanism and Machine Theory 27, no. 6 (November 1992): 751. http://dx.doi.org/10.1016/0094-114x(92)90073-q.

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Kosasih, P. B. "Learning Finite Element Methods by Building Applications." International Journal of Mechanical Engineering Education 38, no. 2 (April 2010): 167–84. http://dx.doi.org/10.7227/ijmee.38.2.7.

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This paper describes how programming projects are used to help students understand the theory of finite element (FE) methods in the author's class. The implementation of FE theory in FE-based commercial software is made clearer through programming simple FE analysis codes. From the experience gained in the coding, students have a better understanding of the theory and numerical processes used in FE commercial software. As a result, they have more confidence in using commercial software, knowing that the computer programs are not simply ‘black boxes’ that process data and produce colourful results. More importantly, they understand the limitations of the programs, how to use them correctly and interpret the generated output correctly. Two projects are described in which students develop codes and then compare the results with those from commercial software.

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Choporov, S. V., M. S. Ihnatchenko, O. V. Kudin, A. G. Kryvokhata, and S. I. Homeniuk. "IMPLEMENTATION OF A FINITE ELEMENT CLASS LIBRARY USING GENERALIZED PROGRAMMING." Radio Electronics, Computer Science, Control, no. 2 (July 10, 2021): 164–73. http://dx.doi.org/10.15588/1607-3274-2021-2-17.

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Анотація:

Context. For computer modeling of complex objects and phenomena of various nature, in practice, the numerical finite element method is often used. Its software implementation (especially for the study of new classes of problems) is a rather laborious process. The high cost of software development makes the development of new approaches to improving the efficiency of programming and maintenance (including the addition of new functions) urgent. Objective. The aim of the work is to create a new effective architecture of programs for finite element analysis of problems in mathematical physics, which makes it easy to expand their functionality to solve new classes of problems. Method. A method for developing programs for finite element analysis using generalized programming is proposed, which makes it possible to significantly simplify the architecture of the software and make it more convenient for maintenance and modification by separating algorithms and data structures. A new architecture of classes that implement finite element calculation is proposed, which makes it possible to easily expand the functionality of programs by adding new types of finite elements, methods for solving systems of linear algebraic equations, parallel computations, etc. Results. The proposed approach was implemented in software as a class library in C ++. A number of computational experiments have been carried out, which have confirmed its efficiency in solving practical problems. Conclusions. The developed approach can be used both to create general-purpose finite element analysis systems with an open architecture, and to implement specialized software packages focused on solving specific classes of problems (fracture mechanics, elastomers, contact interaction, etc.).

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Verbovoy, A. Y., M. L. Sieryk, I. V. Pavlenko, and A. A. Rudenko. "CALCULATION OF THE CENTRIFULAL PUMP CRITICAL FREQUENCIES BASED ON ITS DISCRETE MATHEMATICAL MODEL." Journal of Numerical and Applied Mathematics, no. 1 (135) (2021): 43–52. http://dx.doi.org/10.17721/2706-9699.2021.1.05.

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Calculations of the centrifugal machines critical frequencies of the rotors are currently carried out on the basis of the finite element method using multi-functional software as same as ANSYS and other similar, that work with finite elements of the three-dimensional type, as well as some specialized computer programs working with the beam-type finite elements. Anyway, the finite element method is used. But in this case an user needs a lot of time for prepation of the initial data. Therefore, this article presents a calculation of the critical frequencies of the rotor of a centrifugal fuel pump of a liquid-propellant engine based on its discrete model. This calculation also includes an algorithm of results clarification. This model has been verificated by comparing the critical frequencies obtained in calculations based on the finite element beam model and discrete model with using the algorithm of results clarification and without it.

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PLENGKHOM, K., and W. KANOK-NUKULCHAI. "AN ENHANCEMENT OF FINITE ELEMENT METHOD WITH MOVING KRIGING SHAPE FUNCTIONS." International Journal of Computational Methods 02, no. 04 (December 2005): 451–75. http://dx.doi.org/10.1142/s0219876205000594.

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This paper presents an enhancement of the finite element method (FEM) by adopting the moving Kriging (MK) interpolation as a substitute for the traditional hat functions. The MK shape functions can be referred as element-free because their construction is not tied to the element geometry. Kriging interpolation is a geostatistical technique for spatial interpolation. The basic idea of Kriging is that any unknown point can be interpolated from known scatter points in a specific domain. Using the moving Kriging interpolation, shape functions can be generated over any finite set of nodes. This leads to an idea to extend the influence of a node beyond the layer of surrounding elements to enhance the global smoothness of the field variable and its derivatives. The present paper thus proposes a concept of layered domain of influence. Hence, characteristic arrays of an element, such as the element stiffness, have contributions from all visible nodes that include a set of satellite nodes unattached to the element. The validation of the method was confirmed through numerical tests of one and two-dimensional problems. The results show remarkable accuracy and global smoothness. Existing general-purposed FE programs can be easily modified to accommodate this new element concept; thus, the method has a higher chance to be accepted in practice.

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Дисертації з теми "Finite element method Computer programs"

Brown, Steven Andrew. "Development of a coupled finite element - boundary element program for a microcomputer." Thesis, Virginia Tech, 1985. http://hdl.handle.net/10919/45713.

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This thesis describes the development of a coupled finite element — boundary element program for a microcomputer. The steps outlined in the thesis include the adaptation of a mainframe—based boundary element code for use on a microcomputer, the Verification of this program with sample problems, the development of an algorithm for coupling the Finite Element Method to the Boundary Element Method, the implementation of the coupling algorithm with finite element and boundary element codes, including the development of a Constant Strain Triangular finite element, and the Verification of the coupled program with sample problems. Conclusions are drawn from the results presented, and suggestions are made for future research in this area.
Master of Science

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McDavid, Charles Scott. "Weight optimum arch structures." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA245954.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.
Thesis Advisor(s): Salinas, David. "December 1990." Description based on title screen as viewed on April 1, 2010. DTIC Identifier(s): Arches, Stress Analysis, Weight, Finite Element Analysis, Computer Programs, Optimization, Theses, Degrees Of Freedom, FORTRAN, Stiffness, Case Studies. Author(s) subject terms: Finite Element Method, Arches, Weight Optimization. Includes bibliographical references (p. 107). Also available in print.

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Wadham-Gagnon, Matthew. "Hyperelastic modelling of rubber behaviour in finite element software." Thesis, McGill University, 2006. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=99797.

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Experimental characterisation of rubber in uniaxial, equi-biaxial and planar tension under cyclic quasi-static loading shows strain-induced stress softening, hysteresis and unrecoverable strain. The objective of this work is to study the applications and limitations involved in predicting the behaviour of rubber with hyperelastic models. To assume a preconditioned perfectly elastic material, the data obtained from experiments must first be simplified. The data is then fitted to popular hyperelastic models in the finite element analysis (FEA) software ANSYS(TM). A single hyperelastic model (with given coefficients) is shown to only provide a good fit to a single characterisation test and level of preconditioning at the time. A two-iteration preconditioning method is developed using different hyperelastic models for a given material to approximate the softening effect of cyclic loading in a static FEA simulation. A biaxiality test is developed, providing information on the dominant mode of simple strain in the elements of a FE model. FEA simulations and experimental tests of a cantilevered rubber plate subjected to a bending load at its free end as well as a rubber guide lug subjected to a transverse deflection are presented and discussed. It is shown that using a single hyperelastic model is insufficient to predict the behaviour of these experiments in FEA simulations. The preconditioning iteration, when applied to these simulations, shows very good agreement with the experiments, both qualitatively and quantitatively. The biaxiality test provides insight on which characterisation test is the most appropriate for curve fitting hyperelastic models for a given analysis.

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Ritter, Baird S. "Solution strategies for second order, nonlinear, one dimensional, two point boundary value problems by FEM analysis." Thesis, Monterey, California : Naval Postgraduate School, 1990. http://handle.dtic.mil/100.2/ADA246063.

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Thesis (M.S. in Mechanical Engineering)--Naval Postgraduate School, December 1990.
Thesis Advisor: Salinas, D. "December 1990." Description based on title screen as viewed on April 1, 2010. DTIC Identifier(s): Boundary value problems, finite element analysis, differential equations, problem solving, theses, interpolation, iterations, one dimensional, computer programs, approximation/mathematics, linearity. Author(s) subject terms: Galerkin FEM, nonlinear, quasilinearization, linearization, interpolation, iteration, differential equation, convergence. Includes bibliographical references (p. 164). Also available in print.

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Joglekar, Pramod N. "Three-dimensional finite element modeling of steady state seepage using the computer program 'SEEPS3D'." Thesis, This resource online, 1994. http://scholar.lib.vt.edu/theses/available/etd-06102009-063119/.

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Ostendorp, Markus. "Improved Methodology for Limit States Finite Element Analysis of Lattice Type Structures using Nonlinear Post-Buckling Member Performance." PDXScholar, 1992. https://pdxscholar.library.pdx.edu/open_access_etds/1179.

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Анотація:

In an attempt to achieve more efficient designs, the technological frontier is pushed further and further. Every year science probes for a better understanding of natural phenomena, discovering new and improved methods to perform the same task more efficiently and with better results. One of the new technologies is the nonlinear analysis of structural systems using inelastic post-buckling member performance. Inelastic post-buckling member performance is defined as the constitutive relationship between axial load and displacement after the ultimate member capacity has been exceeded. A nonlinear analysis is able to predict the failure behavior of a structural system under ultimate loads more accurately than the traditionally used linear elastic analysis. Consequently, designs can be improved and become more efficient, which reduces the realization cost of a project. An improved nonlinear analysis solution algorithm has been developed, that allows the analyst to perform a nonlinear analysis using post-buckling member performances faster than previously possible. Furthermore, the original post-buckling member performance database was expanded using results obtained from physical member compression tests. Based on the experimental results, new post-buckling member performance model curves were developed to be used together with the improved nonlinear solution algorithm. In addition, a program was developed that allows the analyst to perform a valid nonlinear analysis using a finite element program (LIMIT). The program combines a numerical pre-processor, and input and output data evaluation modules based on human expertise together with the LIMIT analysis package. Extensive on-line help facilities together with graphical pre- and post-processors were also integrated into the program. The resulting analysis package essentially combines all of the necessary components required to perform a nonlinear analysis using post-buckling member performances into one complete analysis package.

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Pester, Matthias. "Visualization Tools for 2D and 3D Finite Element Programs - User's Manual." Universitätsbibliothek Chemnitz, 2006. http://nbn-resolving.de/urn:nbn:de:swb:ch1-200600436.

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This paper deals with the visualization of numerical results as a very convenient method to understand and evaluate a solution which has been calculated as a set of millions of numerical values. One of the central research fields of the Chemnitz SFB 393 is the analysis of parallel numerical algorithms for large systems of linear equations arising from differential equations (e.g. in solid and fluid mechanics). Solving large problems on massively parallel computers makes it more and more impossible to store numerical data from the distributed memory of the parallel computer to the disk for later postprocessing. However, the developer of algorithms is interested in an on-line response of his algorithms. Both visual and numerical response of the running program may be evaluated by the user for a decision how to switch or adjust interactively certain parameters that may influence the solution process. The paper gives a survey of current programmer and user interfaces that are used in our various 2D and 3D parallel finite element programs for the visualization of the solution.

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Chan, Andrew Hin-Cheong. "A unified finite element solution to static and dynamic problems of geomechanics." Thesis, Swansea University, 1988. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.624605.

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Guney, Murat Efe. "High-performance direct solution of finite element problems on multi-core processors." Diss., Georgia Institute of Technology, 2010. http://hdl.handle.net/1853/34662.

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A direct solution procedure is proposed and developed which exploits the parallelism that exists in current symmetric multiprocessing (SMP) multi-core processors. Several algorithms are proposed and developed to improve the performance of the direct solution of FE problems. A high-performance sparse direct solver is developed which allows experimentation with the newly developed and existing algorithms. The performance of the algorithms is investigated using a large set of FE problems. Furthermore, operation count estimations are developed to further assess various algorithms. An out-of-core version of the solver is developed to reduce the memory requirements for the solution. I/O is performed asynchronously without blocking the thread that makes the I/O request. Asynchronous I/O allows overlapping factorization and triangular solution computations with I/O. The performance of the developed solver is demonstrated on a large number of test problems. A problem with nearly 10 million degree of freedoms is solved on a low price desktop computer using the out-of-core version of the direct solver. Furthermore, the developed solver usually outperforms a commonly used shared memory solver.

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Cook, William Digby. "Studies of reinforced concrete regions near discontinuities." Thesis, McGill University, 1987. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=75457.

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A non-linear finite element computer program capable of predicting the complete response of two-dimensional reinforced concrete members was developed. This tool which accounts for the stress strain characteristics of cracked concrete was used to predict the responses of a number of members containing discontinuities. These members included corbels, dapped end beams, beams with web holes, and deep beams. The results of tests performed by the author as well as tests performed by other researchers were compared with the non-linear predictions. In addition, simple strut and tie models suitable for designing regions near discontinuities were developed. The predictions obtained by these models were compared with the non-linear finite element predictions and with the test results.

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Книги з теми "Finite element method Computer programs"

Lawrence, Taylor Richard, Nithiarasu Perumal, and Zhu J. Z, eds. The finite element method. 6th ed. Oxford: Elsevier/Butterworth-Heinemann, 2005.

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Smith, I. M. Programming the finite element method. 3rd ed. Chichester: John Wiley & Sons, 1998.

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Smith, I. M. Programming the finite element method. Chichester, West Sussex, United Kingdom: John Wiley & Sons Inc., 2014.

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V, Griffiths D., ed. Programming the finite element method. 2nd ed. Chichester [West Sussex]: Wiley, 1988.

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Smith, I. M. Programming the finite element method. 2nd ed. Chichester: Wiley, 1988.

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Ross, C. T. F. Finite element programs for structural vibrations. London: Springer-Verlag, 1991.

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Hyochoong, Bang, ed. The finite element method using MATLAB. Boca Raton: CRC Press, 1997.

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Hyochoong, Bang, ed. The finite element method using MATLAB. 2nd ed. Boca Raton, FL: CRC Press, 2000.

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An introduction to the finite element method using BASIC programs. 2nd ed. Bishopbriggs, Glasgow: Surrey University Press, 1990.

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McKim, Alan E. The development of thin and sandwich composite finite elements to be added to SAP86: A finite element analysis program for microcomputers. [Downsview, Ont.]: Dept. of Aerospace Science and Engineering, 1988.

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Частини книг з теми "Finite element method Computer programs"

Eslami, M. Reza. "Computer Programs." In Finite Elements Methods in Mechanics, 363–70. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-08037-6_17.

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Ross, C. T. F. "The Finite Element Method." In Finite Element Programs for Structural Vibrations, 1–19. London: Springer London, 1991. http://dx.doi.org/10.1007/978-1-4471-1886-2_1.

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Meguid, S. A. "Fundamentals of the Finite Element Method." In Integrated Computer-Aided Design of Mechanical Systems, 84–125. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-009-3409-2_4.

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Fitch, John, and Richard Hall. "Symbolic computation and the finite element method." In Lecture Notes in Computer Science, 95–96. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/3-540-51517-8_94.

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Wang, Zhaozhong, Feihu Qi, and Fugen Zhou. "A Discontinuous Finite Element Method for Image Denoising." In Lecture Notes in Computer Science, 116–25. Berlin, Heidelberg: Springer Berlin Heidelberg, 2006. http://dx.doi.org/10.1007/11867586_11.

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Kruch, S. "Meso-Macro Modelling Using the Finite Element Method." In Computer Simulation in Materials Science, 103–11. Dordrecht: Springer Netherlands, 1996. http://dx.doi.org/10.1007/978-94-009-1628-9_6.

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Santos, Felix C. G., Mardoqueu Vieira, and Maria Lencastre. "Workflow for Simulators Based on Finite Element Method." In Lecture Notes in Computer Science, 555–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/3-540-44862-4_59.

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Yin, Hongwu, Buying Zhang, and Qiumei Liu. "Nonconforming Finite Element Method for Nonlinear Parabolic Equations." In Communications in Computer and Information Science, 491–98. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-16339-5_65.

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Vasilyeva, Maria, and Denis Stalnov. "A Generalized Multiscale Finite Element Method for Thermoelasticity Problems." In Lecture Notes in Computer Science, 713–20. Cham: Springer International Publishing, 2017. http://dx.doi.org/10.1007/978-3-319-57099-0_82.

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Zakharov, Y. N., K. S. Ivanov, and I. E. Saltykov. "Finite-Element Method in Tasks of Loose Soil Erosion." In Communications in Computer and Information Science, 228–35. Cham: Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-030-12203-4_23.

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Тези доповідей конференцій з теми "Finite element method Computer programs"

Luczak, E. R., and Q. Letan. "GRAPE: Finite Element Analysis and Shareware." In ASME 1991 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/cie1991-0112.

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Abstract Use of Finite Element Methods are becoming more prevalent as we move into the 1990’s. More engineers and engineering technologists than ever before are graduating from universities and colleges with knowledge and expertise in the method. A wide assortment of programs are now available that run on micro’s, mini’s, mainframes, and super computers with a broad spectrum of capabilities and costs. Enter the Shareware concept. Shareware does not mean free software. It does mean that software may be freely distributed to promote it’s use and therefore is available to the user at very low cost. This paper discusses a highly interactive Finite Element Analysis system specifically suited for engineers and technologists. GRAPE (Graphic Real-Time Analysis Programs for Engineering) is a series of Shareware programs created to provide the tools necessary to obtain an applied understanding of the technique. GRAPE allows an easy transition to the usage of more complex and powerful codes. A number of sample models are created and analyzed using one of the GRAPE programs, called GCST, to illustrate the ease with which real world applications can be modeled and studied. It is GRAPE’s responsive interactive approach that allows the user to quickly modify the condition of a model and thus note the effects that makes the study of the method appealing and unique. Most experienced users will agree that knowledge of a software package is necessary but the important aspect of being proficient in the method is the synthesis of how to properly model a problem. GRAPE allows the engineer to solve problems easily and quickly to obtain this desired level of competence.

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Xie, Ming. "Development and Application of a Nonlinear Finite Element Computer Program." In ASME 1995 15th International Computers in Engineering Conference and the ASME 1995 9th Annual Engineering Database Symposium collocated with the ASME 1995 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1995. http://dx.doi.org/10.1115/cie1995-0754.

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Abstract An elastic-plastic stress increment updating scheme, namely, an adaptive step-size control scheme of a second-order Runge-Kutta method, was proposed. In order to model the contact loading of a rigid cylinder on a short beam specimen in the study of three-point short beam shear tests of composite materials, a simple contact modeling scheme was also developed. A three-dimensional nonlinear finite element computer program, incorporating a plasticity model for fiber-reinforced composites, was developed in the present study. The stress increment updating scheme and the contact modeling algorithm were implemented into the program. Some numerical examples were presented and these numerical techniques were shown to be more efficient than other conventional schemes while generating comparable results. The numerical results for the modeling of a short beam shear test method for unidirectional composite materials were also presented as an application of the computer program.

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Knight, Charles E. "Subregion Analysis by the SBSF Method in Commercial Finite Element Software." In ASME 1993 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1993. http://dx.doi.org/10.1115/cie1993-0032.

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Abstract It is difficult to analyze a large, complex structure in sufficient detail to obtain accurate results everywhere. One approach to this problem is simply to refine the whole structure model in the regions of interest which is obviously costly. Another approach is to identify a subregion of the structure and develop a separate refined model of the subregion. The most recent method for subregion analysis presented in the literature[1] is called the Specified Boundary Stiffness and Force (SBSF) method. While the method is relatively straight forward and efficient, none of the commercial code vendors has yet included an implementation. This paper gives a brief review of the theory behind the method and then describes its application in two commercial finite element programs. Examples of the application of this method to the problem of a plate with a center hole in tensile loading are presented using ANSYS® and CAEDS(IDEAS)®. The results compare favorably to the theoretical value and show significant improvement in accuracy over the specified boundary displacement method implemented in ANSYS. The capability of the method is also demonstrated by transfer from a 2-D global model to a 3-D subregion model in a laminated composite plate. A laminated plate with a center hole is analyzed overall by use of a layered shell element model. A subregion around the hole is then analyzed using 3-D solid elements with nodal coupling to the layered shell elements on the subregion interface. The 3-D element model provides the well-known interlaminar stresses existing at the composite edge along the hole that are not available from the shell model.

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Simon, Vilmos V. "Computerized Finite Element Mesh Generation in Hypoid Gears." In ASME 1997 Design Engineering Technical Conferences. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/detc97/dac-3771.

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Abstract A method has been developed for the automatic finite element discretization of the pinion and the gear of a Gleason type hypoid gear pair. The numbers and sizes of elements can by arbitrarily chosen in the main directions and in the different regions of the teeth in order to get a finer mesh where extreme values of stresses are expected or previously calculated. The method includes the identification of each element by its number, the definition of element topology, the calculation of the nodal coordinates, and the specification of the boundary conditions. The main part of the method is the calculation of the nodal coordinates, based on the real tooth geometry of the pinion and gear teeth. The determination of the tooth flank and the tooth fillet surface is based on the kinematics of the manufacture and on the applied machine tool settings. On the basis of the presented theory the corresponding computer program has been developed. By using this program the grid mesh in a pinion and in a gear of a hypoid gear pair is generated and presented.

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Nagasawa, S., H. Sakuta, and M. Goto. "Development of Finite Element Analysis Support System Based on the Hybrid Knowledge Model." In ASME 1992 International Computers in Engineering Conference and Exposition. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/cie1992-0090.

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Abstract This paper deals with conceptual orientation and system development of intelligent support system for general purpose FEA (finite element analysis) programs. An integrated support system called “InhierTalk” (Integrated interactive environment for hierarchical representation for FEA) has been developed in Smalltalk, an object oriented language, in order to confirm effectivity of hierarchical representation and to establish an optimum method of the system development. Two object-oriented knowledge models which consist of macro visual data representation and micro regularized data representation are proposed. In the development, it is found to be clear that active and passive evaluation methods are effective for construction of support system.

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Sarwar, M. K., A. A. Shabana, and Toshikazu Nakanishi. "A Design Methodology for Tracked Vehicles Using Experimentally Identified Modal Parameters and the Finite Element Method." In ASME 1994 Design Technical Conferences collocated with the ASME 1994 International Computers in Engineering Conference and Exhibition and the ASME 1994 8th Annual Database Symposium. American Society of Mechanical Engineers, 1994. http://dx.doi.org/10.1115/detc1994-0161.

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Abstract The objective of this study is to develop a design procedure that integrates multibody techniques, the finite element method, and experimental modal analysis techniques. Multibody techniques and the finite element method are first used to develop and numerically test the performance of the proposed design. Based on this computer analysis, a prototype model can be built. The vibration modal parameters of this model can be determined experimentally and used with general purpose multibody computer programs to evaluate the performance of the design. The obtained numerical results can be compared with the results obtained previously using multibody techniques and the finite element method. Adjustments can then be made in the finite element description in order to obtain a more realistic model that compares well with the experimental data. Using the more realistic finite element model, design modifications can be made in order to improve the performance of the design model. The use of the design methodology proposed in this paper is demonstrated using a flexible tracked vehicle model that consists of fifty four interconnected bodies. In this model, the nonlinear contact forces that describe the interaction between the track links and the vehicle components and the ground are developed. The nonlinear dynamic equations of the vehicle are developed in terms of a coupled set of reference and chassis elastic modal coordinates. The flexibility of the chassis of the tracked vehicle is described using the finite element method and experimentally identified modal parameters. The results obtained using the finite element model are compared with the results obtained using experimentally identified modal parameters.

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Xu, Jim, Carl Costantino, Charles Hofmayer, and Herman Graves. "Finite Element Models for Computing Seismic Induced Soil Pressures on Deeply Embedded NPP Structures." In ASME 2006 Pressure Vessels and Piping/ICPVT-11 Conference. ASMEDC, 2006. http://dx.doi.org/10.1115/pvp2006-icpvt-11-93724.

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This paper discusses computations of seismic induced soil pressures using finite element (FE) models for deeply embedded and/or buried (DEB) stiff structures, such as those appearing in the conceptual designs of structures for advanced reactors. For DEB structures, the soil-structure interaction (SSI) effect is expected to have a strong influence on the estimate of the seismic induced soil pressures, especially for stiff structures embedded in soft soil strata. In this paper, two FE models are developed using the SASSI and LS-DYNA computer programs, representing respectively the substructure subtracting method and explicit FE algorithm. SASSI utilizes the wave propagation theory and the principle of superposition to treat the SSI phenomenon. In the LS-DYNA analysis, an attempt is made to apply the direct approach to the SSI effect, which treats the near field soil with an explicit FE mesh that is connected to a transmitting boundary to approximate wave propagation in the half-space. The structural model used for the study is derived from the characteristics of a conceptual design for an advanced reactor. The structure is founded in a soft soil overburden underlain by a rock and the input seismic motion is specified at rock outcrop and has a zero period acceleration (ZPA) equal to 0.3 g, typical of review level earthquakes for nuclear power plant structures in the Central and Eastern United States. Various depths of burial (DOB) for the structure are considered in the analysis to afford an assessment of the DOB effect on the seismic induced soil pressure estimates determined by these methods. Comparisons and discussions of the analysis results computed by the two approaches are provided.

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Shigang, Wang, Yu Jun, Zhou Ji, and Li Mingzhang. "3-D Elasto-Plastic Contact Finite Element Analysis for Bearings Design." In ASME 1990 Design Technical Conferences. American Society of Mechanical Engineers, 1990. http://dx.doi.org/10.1115/detc1990-0099.

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Abstract In this paper, A 3-D elasto-plastic contact problem in bearings is studied by Finite Element Method (FEM). A computer program has been developed for this purpose. A trial-error method is employed to cope with the geometrical nonlinearity and a tangential stiffness method is employed to tackle the material nonlinearity appeared in elasto-plastic contact problems. A frictionless contact problem of roller bearings is analysed, the result reveals that in 3-D elasto-plastic state the trend of the contact surface pressure distribution is similar to Hertz problem’s but flater.

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Wang, Yikun. "Study on Precise Calculation of Three-Dimensional Fracture of Alloy Using Computer MA TLAB Program and Finite Element Method." In 2021 IEEE International Conference on Emergency Science and Information Technology (ICESIT). IEEE, 2021. http://dx.doi.org/10.1109/icesit53460.2021.9696957.

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Guha, Amitava, and Jeffrey Falzarano. "Development of a Computer Program for Three Dimensional Analysis of Zero Speed First Order Wave Body Interaction in Frequency Domain." In ASME 2013 32nd International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2013. http://dx.doi.org/10.1115/omae2013-11601.

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Evaluation of motion characteristics of ships and offshore structures at the early stage of design as well as during operation at the site is very important. Strip theory based programs and 3D panel method based programs are the most popular tools used in industry for vessel motion analysis. These programs use different variations of the Green’s function or Rankine sources to formulate the boundary element problem which solves the water wave radiation and diffraction problem in the frequency domain or the time domain. This study presents the development of a 3D frequency domain Green’s function method in infinite water depth for predicting hydrodynamic coefficients, wave induced forces and motions. The complete theory and its numerical implementation are discussed in detail. An in house application has been developed to verify the numerical implementation and facilitate further development of the program towards higher order methods, inclusion of forward speed effects, finite depth Green function, hydro elasticity, etc. The results were successfully compared and validated with analytical results where available and the industry standard computer program for simple structures such as floating hemisphere, cylinder and box barge as well as complex structures such as ship, spar and a tension leg platform.

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Звіти організацій з теми "Finite element method Computer programs"

Biffle, J. H. JAC3D -- A three-dimensional finite element computer program for the nonlinear quasi-static response of solids with the conjugate gradient method; Yucca Mountain Site Characterization Project. Office of Scientific and Technical Information (OSTI), February 1993. http://dx.doi.org/10.2172/138710.

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Biffle, J. H., and M. L. Blanford. JAC2D: A two-dimensional finite element computer program for the nonlinear quasi-static response of solids with the conjugate gradient method; Yucca Mountain Site Characterization Project. Office of Scientific and Technical Information (OSTI), May 1994. http://dx.doi.org/10.2172/145293.

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Cook, W. A. Generalized finite strains, generalized stresses, and a hybrid variational principle for finite-element computer programs using curvilinear coordinates. Office of Scientific and Technical Information (OSTI), April 1989. http://dx.doi.org/10.2172/6288515.

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Ramakrishnan, Aravind, Ashraf Alrajhi, Egemen Okte, Hasan Ozer, and Imad Al-Qadi. Truck-Platooning Impacts on Flexible Pavements: Experimental and Mechanistic Approaches. Illinois Center for Transportation, November 2021. http://dx.doi.org/10.36501/0197-9191/21-038.

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Truck platoons are expected to improve safety and reduce fuel consumption. However, their use is projected to accelerate pavement damage due to channelized-load application (lack of wander) and potentially reduced duration between truck-loading applications (reduced rest period). The effect of wander on pavement damage is well documented, while relatively few studies are available on the effect of rest period on pavement permanent deformation. Therefore, the main objective of this study was to quantify the impact of rest period theoretically, using a numerical method, and experimentally, using laboratory testing. A 3-D finite-element (FE) pavement model was developed and run to quantify the effect of rest period. Strain recovery and accumulation were predicted by fitting Gaussian mixture models to the strain values computed from the FE model. The effect of rest period was found to be insignificant for truck spacing greater than 10 ft. An experimental program was conducted, and several asphalt concrete (AC) mixes were considered at various stress levels, temperatures, and rest periods. Test results showed that AC deformation increased with rest period, irrespective of AC-mix type, stress level, and/or temperature. This observation was attributed to a well-documented hardening–relaxation mechanism, which occurs during AC plastic deformation. Hence, experimental and FE-model results are conflicting due to modeling AC as a viscoelastic and the difference in the loading mechanism. A shift model was developed by extending the time–temperature superposition concept to incorporate rest period, using the experimental data. The shift factors were used to compute the equivalent number of cycles for various platoon scenarios (truck spacings or rest period). The shift model was implemented in AASHTOware pavement mechanic–empirical design (PMED) guidelines for the calculation of rutting using equivalent number of cycles.

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