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Автор: Grafiati

Опубліковано: 6 вересня 2023

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1

ASADA, Kazuo. "Impact Analysis for 2-Dimensional Elastic-Viscoplastic Solid. FDM Code and FEM Code." Transactions of the Japan Society of Mechanical Engineers Series A 58, no. 556 (1992): 2351–58. http://dx.doi.org/10.1299/kikaia.58.2351.

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2

Tsuji, Nobumasa, and Kazutaka Ohashi. "ICONE23-1203 Development of seismic analysis model for HTGR core on commercial FEM code." Proceedings of the International Conference on Nuclear Engineering (ICONE) 2015.23 (2015): _ICONE23–1—_ICONE23–1. http://dx.doi.org/10.1299/jsmeicone.2015.23._icone23-1_105.

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3

Xavier, César C., and Cláudio C. Motta. "The XMGUN Particle Path FEM Code." IEEE Transactions on Magnetics 46, no. 8 (August 2010): 3281–84. http://dx.doi.org/10.1109/tmag.2010.2045226.

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4

Barour, Sabiha, Abdesselam Zergua, Farid Bouziadi, Mosbeh R. Kaloop, and Waleed E. El-Demerdash. "Nonlinear Numerical and Analytical Assessment of the Shear Strength of RC and SFRC Beams Externally Strengthened with CFRP Sheets." Advances in Civil Engineering 2022 (May 11, 2022): 1–17. http://dx.doi.org/10.1155/2022/8741158.

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Анотація:

This study investigates numerically utilizing nonlinear finite element (ANSYS software) and analytically the shear response of the Reinforced Concrete (RC) beams. Different beams are considered in the current study, such as RC, steel fibre reinforced concrete (SFRC) without web reinforcement, and RC externally reinforced in the shear zone with carbon fibre reinforced polymer (CFRP) sheets. Nonlinear finite element model (FEM) is designed to simulate the performance of the designed beams. The results of FEM are compared to experimental measurements and standard design codes (ACI 440.2R-17, FIB 14, CNR-DT200, and ACI 318-19). According to the experimental approach and nonlinear finite element, the enhancement in the load carrying capacity of SFRC beam due to CFRP strengthening decreases with a volume fraction of steel fibres of 2%. However, the effect of CFRP strengthening on the shear behaviour of RC beams was observed in increased load carrying and ultimate deflection capacities as a result of the CFRP strengthening. The results show that CFRP has a significant contribution to shear strength. At each load increment, the created model accurately reproduced the initial and progressive crack patterns. A comparison of nonlinear finite element and analytical models was conducted using the codes ACI 440.2R-17, FIB 14, CNR-DT200, and ACI 318-19. Numerically, the FEM results showed a high agreement with ACI 440.2R-17 standard code, with correlation approach to 99%. The comparison experimental load capacity of beams to FEM and ACI 440.2R-17 shows that the FEM can be significantly used to estimate the shear strength of beams in the X-Y directions with simulating different scenarios of CFRP and SFRC characteristics. The discrepancy between the nonlinear FEA and the theoretical predictions from the ACI 440.2R-17 code is less than 1%, from the FIB14 code is less than 2%, from the CNR-DT200 code is less than 15%, and from the ACI 318-19 code is less than 30%. The ultimate load capacity evaluated based on ACI 440.2R-17 code provision shows a good agreement with the experimental data as compared to the others’ code provision. The results of the finite element analysis and analytical models were in good agreement with the experimental results. The most significant advantage of finite element analysis over experimental approaches was that it can aid in the investigation of different output results that cannot be measured experimentally, such as shear stress in the XY direction throughout the beam strengthened in shear with different CFRP properties and steel fibre reinforced concrete (SFRC).

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5

Ceretti, E., C. Lazzaroni, L. Menegardo, and T. Altan. "Turning simulations using a three-dimensional FEM code." Journal of Materials Processing Technology 98, no. 1 (January 2000): 99–103. http://dx.doi.org/10.1016/s0924-0136(99)00310-6.

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6

Pugacheva, G. I., A. A. Gusev, U. B. Jayanthi, I. M. Martin, and W. N. Spjeldvik. "FEM code simulation of the magnetospheric proton fluxes." Advances in Space Research 28, no. 12 (January 2001): 1759–62. http://dx.doi.org/10.1016/s0273-1177(01)00543-9.

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7

Slota, Ján, Miroslav Jurčišin, and Emil Spišák. "Experimental and Numerical Analysis of Local Mechanical Properties of Drawn Part." Key Engineering Materials 586 (September 2013): 245–48. http://dx.doi.org/10.4028/www.scientific.net/kem.586.245.

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In this study, numerical and experimental results of deep drawing process were compared. Drawn part, used in automotive industry was drawn and measured using ARGUS measurement system, which works on a digital image correlation method (DIC). In order to optimize and verify accuracy of a numerical simulation results, this process was modeled in two codes which work on principle of the finite element method (FEM). Two types of FEM codes were used. Code which works on base of both, implicit and explicit time integration scheme, were used for calculation. Results were compared and discussed.

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8

Onishi, Yuki. "A Concept of Cell-Based Smoothed Finite Element Method Using 10-Node Tetrahedral Elements (CS-FEM-T10) for Large Deformation Problems of Nearly Incompressible Solids." International Journal of Computational Methods 17, no. 02 (October 24, 2019): 1845009. http://dx.doi.org/10.1142/s0219876218450093.

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Анотація:

A new concept of smoothed finite element method (S-FEM) using 10-node tetrahedral (T10) elements, CS-FEM-T10, is proposed. CS-FEM-T10 is a kind of cell-based S-FEM (CS-FEM) and thus it smooths the strain only within each T10 element. Unlike the other types of S-FEMs [node-based S-FEM (NS-FEM), edge-based S-FEM (ES-FEM), and face-based S-FEM (FS-FEM)], CS-FEM can be implemented in general finite element (FE) codes as a piece of the element library. Therefore, CS-FEM-T10 is also compatible with general FE codes as a T10 element. A concrete example of CS-FEM-T10 named SelectiveCS-FEM-T10 is introduced for large deformation problems of nearly incompressible solids. SelectiveCS-FEM-T10 subdivides each T10 element into 12 four-node tetrahedral (T4) subelements with an additional dummy node at the element center. Two types of strain smoothing are conducted for the deviatoric and hydrostatic stress evaluations and the selective reduced integration (SRI) technique is utilized for the stress integration. As a result, SelectiveCS-FEM-T10 avoids the shear/volumetric locking, pressure checkerboarding, and reaction force oscillation in nearly incompressible solids. In addition, SelectiveCS-FEM-T10 has a relatively long-lasting property in large deformation problems. A few examples of large deformation analyses of a hyperelastic material confirm the good accuracy and robustness of SelectiveCS-FEM-T10. Moreover, an implementation of SelectiveCS-FEM-T10 in the FE code ABAQUS as a user-defined element (UEL) is conducted and its capability is discussed.

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9

Mankovits, T., I. Kocsis, T. Portik, T. Szabó, and I. Páczelt. "Shape design of rubber part using FEM." International Review of Applied Sciences and Engineering 4, no. 1 (June 1, 2013): 85–94. http://dx.doi.org/10.1556/irase.4.2013.1.12.

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Abstract This paper presents a novel solution for shape optimization of compressed rubber parts. The procedure is based on the finite element method (FEM). A special purpose FEM code written in FORTRAN has been developed for the analysis of nearly incompressible axi-symmetric rubber parts. Numerical stability of the code and sensitivity analysis of the FEM input parameters are investigated. The aim of the parameter optimization is to reduce the time consuming FEM computations for the optimization process. The objective of the optimization is to find the optimal shape of the investigated rubber parts with a specified load-displacement curve. A regression model is used to determine the connection between the input and output data calculated by the FEM.

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10

Tokuda, N., T. Sakurai, and T. Teraoku. "Sloshing Analysis Method Using Existing FEM Structural Analysis Code." Journal of Pressure Vessel Technology 117, no. 3 (August 1, 1995): 268–72. http://dx.doi.org/10.1115/1.2842122.

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A fluid analysis method using an analogy relating the pressure wave equation of fluid to elasticity equations is applied to sloshing analysis, where existing FEM structural analysis codes are available. It is seen from theoretical consideration that the present method is equivalent to the classical FEM formulation of linear sloshing analysis. The numerical analyses of liquid sloshing in a rigid cubic tank and of vibration of tubulous fluid under gravitational force are performed by using the present method. The results are shown to be in excellent agreement with the theoretical values.

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11

Menon, Nivedita. "A Uniform Civil Code in India: The State of the Debate in 2014." Feminist Studies 40, no. 2 (2014): 480–86. http://dx.doi.org/10.1353/fem.2014.0025.

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12

Khalifa, W. M. A., and K. F. O. El-Kashif. "Computational Model for the Evaluation of Reinforced Concrete Silos Subjected to Thermal Load." Engineering, Technology & Applied Science Research 9, no. 4 (August 10, 2019): 4411–18. http://dx.doi.org/10.48084/etasr.2874.

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Silos are special structures subjected to many different unconventional loading conditions like temperature differences which result in unusual failure modes. So, it is necessary for many codes to maintain and study the effect of thermal loads in design. The evaluation of design and construction practices is an essential step in the development of the design code for reinforced concrete (RC) silos, especially in arid zones like Saudi Arabia. This work evaluates the effect of thermal loads on silo wall design in terms of applied forces and stresses. These thermal loads affect the silo walls in two main manners, tangential oriented stresses (circumferential stress) due to thermally induced surcharge pressure during cooling of a filled silo structure and stresses due to differences of temperature across the wall thickness. A computation analytical finite element model (FEM) has been applied in a commercial analyzing program (SAP 2000 version 16). Various code provisions were used with comparison with the FEM results. For hoop forces, EU regulation, German standard, and Polish norm provisions were compared with a linear FEM with two parameters, wall thickness and temperature difference. For oriented stresses in silo wall, the American concrete institute (ACI) provisions were used in comparison with linear and nonlinear FEM with the same two parameters, wall thickness and temperature difference. This work showed that the nonlinear analysis of FEM has good matching with the corresponding values in ACI, leading to the conclusion that nonlinear analysis is more accurate than linear analysis. Moreover, the study results of hoop forces showed a distinct pattern with the temperature difference, silo radii, and insignificant silo wall thickness for each of FEM, EU, and Poland codes. This study is used for the rapid determination of critical areas of concern for critical loading combinations and for varying silo configurations.

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13

Lee, Minhyung, Wan-Jin Chung, Hak Jun Kim, and Hyung Won Kim. "ExLO: A three-dimensional total shock physics FEM code." Journal of Mechanical Science and Technology 23, no. 5 (May 2009): 1342–53. http://dx.doi.org/10.1007/s12206-009-0353-0.

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14

MILENIN, Andrij. "PARALLEL SOLUTION OF THERMOMECHANICAL INVERSE PROBLEMS FOR LASER DIELESS DRAWING OF ULTRA-THIN WIRE." Applied Computer Science 18, no. 3 (September 30, 2022): 42–53. http://dx.doi.org/10.35784/acs-2022-20.

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The paper discusses the solving of inverse thermomechanical problems requiring a large number of FEM tasks with various boundary conditions. The study examined the case when all tasks have the same number of nodes, finite elements, and nodal connections. In this study, the speedup of the solution of the inverse problem is achieved in two ways: 1. The solution of all FEM tasks in parallel mode. 2. The use by all FEM tasks a common matrix with addresses of nonzero elements in the stiffness matrices. These algorithms are implemented in the own FEM code, designed to solve inverse problems of the hot metal forming. The calculations showed that developed code in parallel mode is effective for the number of tasks late than 0,7-0,9 of the number of available processors. Thus, at some point, it becomes effective to use a sequential solution to all tasks and to use a common matrix of addresses of nonzero elements in the stiffness matrix. The achieved acceleration at the optimal choice of the algorithm is 2–10 times compared with the classical multivariate calculations in the FEM. The paper provides an example of the practical application of the developed code for calculating the allowable processing maps for laser dieless drawing of ultra-thin wire from copper alloy by solving the thermomechanical inverse problem. The achieved acceleration made it possible to use the developed parallel code in the control software of the laboratory setup for laser dieless drawing.

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15

Mou, Zhao Yu, Peng Fei Gao, Wei Fang Wang, and Dong Hui Wen. "3D Finite Element Simulation on the Orthogonal Cutting Processes with Different Commercial Codes." Advanced Materials Research 188 (March 2011): 555–60. http://dx.doi.org/10.4028/www.scientific.net/amr.188.555.

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The purpose of this paper is to compare different simulation model of orthogonal cutting process using three different FEM commercial codes as well as with the results of orthogonal experiment. For one thing, element type, boundary condition and friction model between the chip and tool commercial have been compared when the numerical model established in implicit finite element code, Deform3D and the explicit code ANSYS/LS-DYNA and Thirdwave AdvantEdge. For another, main and thrust cutting forces, shear angles, chip thicknesses and contact lengths by three codes are compared with the orthogonal metal cutting experiment by Movahhedy and Altintas.

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16

OLATOYINBO, Seyi Festus. "Verification of a High-Order FEM-based CFD Code using the Method of Manufactured Solutions." INCAS BULLETIN 15, no. 2 (June 9, 2023): 75–89. http://dx.doi.org/10.13111/2066-8201.2023.15.2.8.

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A high-order computational fluid dynamics (CFD) code capable of solving compressible turbulent flow problems was developed. The CFD code employs the Flowfield Dependent Variation (FDV) scheme implemented in a Finite Element Method (FEM) framework. The FDV scheme is basically derived from the Lax-Wendroff Scheme (LWS) involving the replacement of LWS’s explicit time derivatives with a weighted combination of explicit and implicit time derivatives. The code utilizes linear, quadratic and cubic isoparametric quadrilateral and hexahedral Lagrange finite elements with corresponding piecewise shape functions that have formal spatial accuracy of second-order, third-order and fourth-order, respectively. In this paper, the results of observed order-of-accuracy of the implemented FDV FEM-based CFD code involving grid and polynomial order refinements on uniform Cartesian grids are reported. The Method of Manufactured Solutions (MMS) is applied to governing 2-D Euler and Navier-Stokes equations for flow cases spanning both subsonic and supersonic flow regimes. Global discretization error analyses using discrete 𝐿2 norm show that the spatial order-of-accuracy of the FDV FEM-based CFD code converges to the shape function polynomial order plus one, in excellent agreement with theory. Uniquely, this procedure establishes the wider applicability of MMS in verifying the spatial accuracy of a high-order CFD code.

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17

Funken, Stefan, Dirk Praetorius, and Philipp Wissgott. "Efficient implementation of adaptive P1-FEM in Matlab." Computational Methods in Applied Mathematics 11, no. 4 (2011): 460–90. http://dx.doi.org/10.2478/cmam-2011-0026.

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Abstract We provide a MATLAB package p1afem for an adaptive P1-finite element method (AFEM). This includes functions for the assembly of the data, different error estimators, and an indicator-based adaptive meshrefining algorithm. Throughout, the focus is on an efficient realization by use of MATLAB built-in functions and vectorization. Numerical experiments underline the efficiency of the code which is observed to be of almost linear complexity with respect to the runtime. Although the scope of this paper is on AFEM, the general ideas can be understood as a guideline for writing efficient MATLAB code.

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18

Nitti, Giuseppe, Giuseppe Lacidogna, and Alberto Carpinteri. "Structural Analysis of High-rise Buildings under Horizontal Loads: A Study on the Piedmont Region Headquarters Tower in Turin." Open Construction & Building Technology Journal 13, no. 1 (May 31, 2019): 81–96. http://dx.doi.org/10.2174/1874836801913010081.

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Background: When a high-rise building is designed, the main aim is to limit transversal displacements. In addition, when vertical bracings, made up of thin open sections, are subjected to external torsion, warping and secondary torsional moment stresses arise which need to be evaluated using Vlasov’s Theory. Objective: This work analyzes the Piedmont Region Headquarters Tower, using an analytical formulation which enables the calculation of structural displacements and stresses. Methods: The analytical formulation used in the static and dynamic analysis of the structure was implemented using Matlab computation code. A computational model was also created using a commercial Finite Element Code to validate the results. Results: The results obtained with the analytical model were compared with those obtained with the FEM model. The transversal displacements, bending, torsional, and axial stresses in the vertical bracings were calculated, along with the principal natural frequencies of the structure. Conclusion: It has been proved that analytical calculation codes are a good tool for the preliminary design of a high-rise building. In particular, the proposed formulation, which has only three degrees of freedom per floor, provided results similar to those obtained using a FEM model. The great advantage of this analytical code is to speed up the computation time, which is proportional to the square of the degrees of freedom. In a FEM model, these have orders of magnitude greater than in the analytical model. Moreover, the proposed formulation allows the load distribution between the structural elements to be determined.

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19

Hsu, Tai-Wen, Shan-Hwei Ou, and Jian-Ming Liau. "Hindcasting nearshore wind waves using a FEM code for SWAN." Coastal Engineering 52, no. 2 (February 2005): 177–95. http://dx.doi.org/10.1016/j.coastaleng.2004.11.005.

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20

Jarzebski, Pawel, Krzysztof Wisniewski, and Werner Wagner. "On Evaluation of Multithreaded FEM Code for Composite Shell Computations." PAMM 17, no. 1 (December 2017): 315–16. http://dx.doi.org/10.1002/pamm.201710127.

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21

Ståhle, P. "Easy adaptation of a commercial FEM code for self-similarity." Communications in Numerical Methods in Engineering 11, no. 2 (February 1995): 117–25. http://dx.doi.org/10.1002/cnm.1640110205.

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22

Demeshko, Irina, Jerry Watkins, Irina K. Tezaur, Oksana Guba, William F. Spotz, Andrew G. Salinger, Roger P. Pawlowski, and Michael A. Heroux. "Toward performance portability of the Albany finite element analysis code using the Kokkos library." International Journal of High Performance Computing Applications 33, no. 2 (February 5, 2018): 332–52. http://dx.doi.org/10.1177/1094342017749957.

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Performance portability on heterogeneous high-performance computing (HPC) systems is a major challenge faced today by code developers: parallel code needs to be executed correctly as well as with high performance on machines with different architectures, operating systems, and software libraries. The finite element method (FEM) is a popular and flexible method for discretizing partial differential equations arising in a wide variety of scientific, engineering, and industrial applications that require HPC. This article presents some preliminary results pertaining to our development of a performance portable implementation of the FEM-based Albany code. Performance portability is achieved using the Kokkos library. We present performance results for the Aeras global atmosphere dynamical core module in Albany. Numerical experiments show that our single code implementation gives reasonable performance across three multicore/many-core architectures: NVIDIA General Processing Units (GPU’s), Intel Xeon Phis, and multicore CPUs.

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23

D'Urso, Gianluca, Michela Longo, Giancarlo Maccarini, and Claudio Giardini. "The Simulation of Metal Foams Forming Processes." Key Engineering Materials 473 (March 2011): 524–31. http://dx.doi.org/10.4028/www.scientific.net/kem.473.524.

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Metal foams are two-phase compounds of a gas and a solid with several interesting physical and mechanical properties; in particular they have very low density, good rigidity, excellent energy absorption, high vibration damping. At now, the final shape of foamed devices is directly obtained through the foaming process itself and no further shaping steps are expected. Anyway, the plastic formability of metal foams, in order to both characterize the material itself and to produce more complex parts, seems to be useful for several industrial applications. Since metal foams are quite new products, the basic aspects ruling plastic deformation processes are still partially unknown and FEM methods may represent a valid tool for deepening these topics. This work deals with the formability of Aluminum Foam Sandwich (AFS) panels and it is focused on the FEM simulation of a compression processes. A numerical model was set up by using the FEM code Deform 2D v10.1. Foam behaviour was simulated by means of a compressible (porous) material model and the foam cracking was simulated using a damage model based on the foam density parameter. Some FEM routines were implemented into the FEM code to take into account both the non-homogeneous distribution and the strain hardening effect of the foam cells. An experimental campaign based on the compression of AFS panels made of close cells foam was carried out to fine tune and to validate the model. In particular, experimental data regarding load stroke curves and foam density were used to optimize the material description. An innovative solution, based on a non-linear relation between foam density and effective strain of the foam, was implemented into the FEM code.

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24

Kiesel, Theo, and Steffen Marburg. "Simulation of mode-locking phenomena in a complex nonlinear rotor system using 3D solid finite elements." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 230, no. 6 (December 3, 2015): 959–73. http://dx.doi.org/10.1177/0954406215617196.

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The most common simulation approach in rotor dynamics is based on beam models. Usually, these models are very compact and come at low computational costs. However, they are afflicted with a number of limitations, making them insufficient for the analysis of more complex rotor systems, which require 3D solid modeling. General purpose FEM codes offer full 3D solid modeling capabilities, but the question still remains, whether they are capable of correctly taking into account all the effects that arise from rotation. This paper provides an example of a complex, highly nonlinear rotor system, which cannot be simulated or even modeled accurately by using beam elements, but rather requires 3D solid modeling. ABAQUS is used-as a representative example for a general purpose FEM code-to build up an appropriate model. By doing so, the paper addresses the question, whether a general purpose FEM code is able to cover the necessary rotor dynamic effects. The model which is derived here takes into account nonlinear stiffness behavior, and includes contact between different components of a rotor assembly. The objective is to simulate a run-up through a bending resonance, using direct time integration. The simulation results are compared with experiments, showing good consistency. During the crossing of the critical speed due to the bending resonance, mode-locking can be observed in the experiment and is well represented by the simulation model.

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25

Scutaru, Maria Luminița, Sohaib Guendaoui, Ouadie Koubaiti, Lahcen El Ouadefli, Abdeslam El Akkad, Ahmed Elkhalfi, and Sorin Vlase. "Flow of Newtonian Incompressible Fluids in Square Media: Isogeometric vs. Standard Finite Element Method." Mathematics 11, no. 17 (August 28, 2023): 3702. http://dx.doi.org/10.3390/math11173702.

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This article highlights a study focused on resolving a nonlinear problem in fluid dynamics using the Navier–Stokes equations as a mathematical model. The study focuses on comparing the isogeometric analysis (IGA) B-spline method with the traditional finite element method (FEM) in a two-dimensional context. The objective is to showcase the superior performance of the IGA method in terms of result quality and computational efficiency. The study employs GEOPDE’s MATLAB code for implementing and computing the NURBS method and COMSOL Software’s FEM code for comparison. The advantages of the IGA B-spline method are highlighted, including its ability to accurately capture complex flow behavior and its reduced computation time compared to FEM. The study aims to establish the superiority of the IGA method in solving nonlinear Navier–Stokes equations, providing valuable insights for fluid dynamics and practical implications for engineering simulations.

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26

Zhao, Min, Jin Di, Wen Ru Lu, Jie Dai, Feng Jiang Qin, and Li Ning. "Comparison of Temperature Gradient Effect on Curved Concrete Box Girder Based on Different Codes." Advanced Materials Research 671-674 (March 2013): 957–61. http://dx.doi.org/10.4028/www.scientific.net/amr.671-674.957.

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Based on a project of "Study on Bearing Capacity and Design Method for Curved PC Box Girder Bridge"(number: 03-01K), which came from the Communications Department of Shaanxi Province, temperature gradient effect of curved concrete box girder was researched. Using Finite Element Method (FEM), the effect of temperature gradient stipulated in several codes (Britain bridge standard, Australia bridge specification, New Zealand bridge standard, Japan bridge standard, America bridge specification and China bridge code) were analyzed and compared with. The results show that the calculated stress caused by temperature gradient is relatively unfavorable according to the bridge specification of China, which indicated that it is safer to adhere to Chinese code.

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27

LEE, MINHYUNG, and WAN JIN CHUNG. "MATERIAL INTERFACE TRACKING IN MULTI-MATERIAL EULERIAN FEM FOR LARGE DEFORMATIONS." International Journal of Modern Physics B 22, no. 09n11 (April 30, 2008): 1576–83. http://dx.doi.org/10.1142/s0217979208047109.

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A method has been described for tracking material interface in a 3-Dim, rectangular-grid, time-dependent, Eulerian hydrodynamics code. The accuracy is crucial to the overall accuracy of the simulations. A 2nd order accuracy interface reconstruction method based on the Youngs' scheme has been implemented in our new dynamic FEM code. The method is applicable to the type of code in which the layout of materials is described solely by the volume fraction of the various materials in each computational cell. The volume fraction distribution is used to construct a plane interface in each mixed cell. The position of interface determines the flow across cell sides and hence enables volume fractions to be updated to the next time level. In this paper, the 2nd order accuracy method has been compared with the new 1st order accuracy method which we recently implemented based on the SLIC (Simple Line Interface Calculation).

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28

Yang, Mei, and Xiao Liu. "A Finite Element Simulation of Mold Filling Process in Resin Film Infusion Based on Material Properties and Mechanics Properties." Applied Mechanics and Materials 252 (December 2012): 289–92. http://dx.doi.org/10.4028/www.scientific.net/amm.252.289.

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A finite element method (FEM) has been developed to simulate the isothermal resin infusing process in resin film infusion. The FEM is based on conservation of resin mass at any instant of time and is objective of resin film infusion (RFI) fiber impregnation and mold filling. The developed computer code was able to simulate the resin infusing visually. A numerical example presented here demonstrated that compared with traditional finite element/ control-volume (FE/CV), FEM is physically accurate and computationally efficient.

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29

Koishi, Masataka, and Kazuyuki Kabe. "Development of Homogenization Analysis System based on General-Purpose FEM Code." Transactions of the Japan Society of Mechanical Engineers Series A 59, no. 561 (1993): 1395–400. http://dx.doi.org/10.1299/kikaia.59.1395.

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30

Koishi, Masataka, and Kazuyuki Kabe. "Development of Homogenization Analysis System Based on General-Purpose FEM Code." JSME international journal. Ser. A, Mechanics and material engineering 38, no. 2 (April 15, 1995): 171–76. http://dx.doi.org/10.1299/jsmea1993.38.2_171.

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31

Tang, Xin Yan. "A New FEM for Torsion Cracked Cylinder Based on Crack3D FEA Code and Mushhelisvili Torsion Theorem." Advanced Materials Research 197-198 (February 2011): 1374–80. http://dx.doi.org/10.4028/www.scientific.net/amr.197-198.1374.

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The objective of this paper is to use the specialty fracture software Crack3D FEA Code, well known Ansys software and Mushhelisvili’s torsion theorem to analyze the torsion problem of a crack rectangular cylinder. Several numerical results such as stress intensity factors KIII , torsion rigidity D, shearing stresses (τxy ,τyz ) and the contour nodal solution data are obtained. All the results are satisfactory.

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32

Zhang, Qing, Graeme J. Milligan, and Maria Anna Polak. "Nonlinear finite element analysis of punching shear strength of reinforced concrete slabs supported on L-shaped columns." Budownictwo i Architektura 19, no. 4 (November 2, 2020): 125–38. http://dx.doi.org/10.35784/bud-arch.2122.

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Анотація:

Most current concrete design codes include provisions for punching shear of reinforced concrete slabs supported on columns with L, T, and cruciform shapes. Reference studies verifying the accuracy of these code provisions are typically not provided. Empirical data of punching failures of slabs supported on columns with L, T, and cruciform shapes are limited due to the cost and time required to test specimens with slab thicknesses and column sizes commonly used in practice. In this paper, the punching shear behaviour of five interior L-shaped slab-column connections, one without a slab opening and four with slab openings, subjected to static concentric loading are analyzed using a plasticity-based nonlinear finite element model (FEM) in ABAQUS. The FEM is similar to models previously calibrated at the University of Waterloo and are calibrated considering nine slabs that are tested to study the impact of column rectangularity on the punching shear behaviour of reinforced concrete slabs. The finite element analysis results indicate that shear stresses primarily concentrate around the ends of the L, and that current code predictions from ACI 318-19 and Eurocode 2 may be unconservative due to the assumed critical perimeters around L-shaped columns.

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33

Lei, Zheng Qiang, Jian Chen, Fu Xiang Wang, Ting Wang, and Li Jian Zhou. "Strain Analysis of Oil and Gas Pipeline with Dents Based on ILI Data." Applied Mechanics and Materials 853 (September 2016): 372–76. http://dx.doi.org/10.4028/www.scientific.net/amm.853.372.

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Dents in an oil and gas pipeline can be detected by In-line-Inspection (ILI), and structure integrity analysis of the pipe with theses reported dents is important for the safe operation. Strain analysis of the dented pipe is a way of fine assessment and ASME B31.8 has established the strain assessment code and its acceptable range. However, the method of strain assessment is rarely used due to the difficulty of strain calculation for a buried pipe. In this study, features of ILI data are investigated to elaborate the necessary of filtering analysis for strain analysis of the dent with ILI data. Then typical filtering methods are used to smooth the ILI data, and strain analysis are carried out with the smoothed data to study the practicability of strain assessment. Profile and strain of a dent in D813 pipe were obtained by Finite Element Method (FEM). Then different filtering methods were used to smooth the simulated ILI data of the dent which were selected from FEM profile. Strain of the dent were also calculated by smoothed data with the latest ASME B31.8 code, and compared with it from FEM at last to prove the feasibility and validity of the filtering methods with ASME B31.8 code.

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34

Grosjean, Elise, and Yvon Maday. "Error estimate of the non-intrusive reduced basis method with finite volume schemes." ESAIM: Mathematical Modelling and Numerical Analysis 55, no. 5 (September 2021): 1941–61. http://dx.doi.org/10.1051/m2an/2021044.

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The context of this paper is the simulation of parameter-dependent partial differential equations (PDEs). When the aim is to solve such PDEs for a large number of parameter values, Reduced Basis Methods (RBM) are often used to reduce computational costs of a classical high fidelity code based on Finite Element Method (FEM), Finite Volume (FVM) or Spectral methods. The efficient implementation of most of these RBM requires to modify this high fidelity code, which cannot be done, for example in an industrial context if the high fidelity code is only accessible as a "black-box" solver. The Non-Intrusive Reduced Basis (NIRB) method has been introduced in the context of finite elements as a good alternative to reduce the implementation costs of these parameter-dependent problems. The method is efficient in other contexts than the FEM one, like with finite volume schemes, which are more often used in an industrial environment. In this case, some adaptations need to be done as the degrees of freedom in FV methods have different meanings. At this time, error estimates have only been studied with FEM solvers. In this paper, we present a generalisation of the NIRB method to Finite Volume schemes and we show that estimates established for FEM solvers also hold in the FVM setting. We first prove our results for the hybrid-Mimetic Finite Difference method (hMFD), which is part the Hybrid Mixed Mimetic methods (HMM) family. Then, we explain how these results apply more generally to other FV schemes. Some of them are specified, such as the Two Point Flux Approximation (TPFA).

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35

Wang, Jin Yan, and Ji Xian Sun. "A Novel Approach for Transversely Anisotropic 2D Sheet Metal Forming Simulation." Advanced Materials Research 347-353 (October 2011): 3939–45. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.3939.

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Анотація:

In most FEM codes, the isotropic-elastic & transversely anisotropic-elastoplastic model using Hill's yield function has been widely adopted in 3D shell elements (modified to meet the plane stress condition) and 3D solid elements. However, when the 4-node quadrilateral plane strain or axisymmetric element is used for 2D sheet metal forming simulation, the above transversely anisotropic Hill model is not available in some FEM code like Ls-Dyna. A novel approach for explicit analysis of transversely anisotropic 2D sheet metal forming using 6-component Barlat yield function is elaborated in detail in this paper, the related formula between the material anisotropic coefficients in Barlat yield function and the Lankford parameters are derived directly. Numerical 2D results obtained from the novel approach fit well with the 3D solution .

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36

Henrard, Christophe, Anne Marie Habraken, Alexander Szekeres, Joost R. Duflou, S. He, Albert Van Bael, and Paul van Houtte. "Comparison of FEM Simulations for the Incremental Forming Process." Advanced Materials Research 6-8 (May 2005): 533–42. http://dx.doi.org/10.4028/www.scientific.net/amr.6-8.533.

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Incremental forming is an innovative and highly flexible sheet metal forming technology for small batch production and prototyping that does not require any adapted dies or punches to form a complex shape. The purpose of this article is to perform FEM simulations of the forming of a cone with a 50-degree wall angle by incremental forming and to investigate the influence of some crucial computational parameters on the simulation. The influence of several parameters will be discussed: the FEM code used (Abaqus or Lagamine, a code developed at the University of Liège), the mesh size, the potential simplification due to the symmetry of the part and the friction coefficient. The output is given in terms of final geometry (which depends on the springback), strain history and distribution during the deformation, as well as reaction forces. It will be shown that the deformation is localized around the tool and that the deformations constantly remain close to a plane strain state for this geometry. Moreover, the tool reaction clearly depends on the way the contact is taken into account.

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37

Chargin, Mladen. "Minimization of radiated noise." Journal of the Acoustical Society of America 152, no. 4 (October 2022): A235. http://dx.doi.org/10.1121/10.0016122.

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Анотація:

Radiatednoise from various components is of increasing concern for today's automotive manufacturers. Traditionally, this analysis was usually performed with Boundary Element Method (BEM) software. Analysis results, although interesting in general, do not provide the design engineer with information on how to improve the design. Unfortunately, there is no sensitivity or optimization capability within any known BEM code, especially when coupled with a FEM code, which provides the vibration of the structure. This paper addresses the problem by describing the software developed by CDH, which combines the structural FEM analysis and optimization capability (MSC/Nastran, SOL200)with CDHBEM analysis code such that one can perform analysis andoptimization very quickly and efficiently. This approach is applied to an automotive air cleaner with internal acoustic domain, which is excited by pulsation of intake valves, which then vibrates and radiates noise. The radiated noise is then minimized at five predefined microphone positions in the far field. The maximum pressure was reduced by approximately 16 dB.

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38

Alimov, Artem�, Sergey� Stebunov, and Nikolai� Biba. "Simulation of microstructure evolution during forging and heat treatment of Ti-6Al-3.5Mo-1.5Zr-0.3Si Titanium Alloy." Computer Methods in Material Science 18, no. 3 (2018): 90–97. http://dx.doi.org/10.7494/cmms.2018.3.0617.

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The model of dynamic recrystallization of Ti-6Al-3.5Mo-1.5Zr-0.3Sihas been developed based on experimental data and implemented in QForm FEM code. Kinetics of dynamic recrystallization was simulated by Johnson-Mehl-Avrami-Kolmogorov equation. Effect of aging time (1-6 h) and temperature (450-650 °C) on mechanical properties has been experimentally studied. The model of heat treatment of Ti-6Al-3.5Mo-1.5Zr-0.3Si has been developed and implemented in QForm FEM code. The model is capable to predict phase compositionand hardness during and after arbitrary heat treatment within studied range.It was found that the highest hardness of Ti-6Al-3.5Mo-1.5Zr-0.3Si can be obtained by aging during 4-6 hours at 550 °C after solution treatment at 960 °C.

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39

Zhang, Hong Ming, and Li Xiang Zhang. "Numerical Simulation of Fluid-Structure Interaction with Water Hammer in a Vertical Penstock Subjected to High Water Head." Advanced Materials Research 860-863 (December 2013): 1530–34. http://dx.doi.org/10.4028/www.scientific.net/amr.860-863.1530.

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The theoretical model of weakly compressible coupling water hammer was established and a FSI program code was developed for coupled weakly compressible water with penstock movement. It combines the weakly compressible water source CFD code and FEM shell element code. The shell element based on orthogonal curvilinear coordinates was completed in FEAP. Meanwhile, the turbulence model in OpenFoam class library was called by using object-oriented technology. This code takes into account both the weak compressibility of water and fluid turbulence characteristics. Using this code, a fluid structure interaction analysis with water hammer was completed. The numerical results agree well with the field test results.

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40

Nadal, E., J. J. Ródenas, J. Albelda, M. Tur, J. E. Tarancón, and F. J. Fuenmayor. "Efficient Finite Element Methodology Based on Cartesian Grids: Application to Structural Shape Optimization." Abstract and Applied Analysis 2013 (2013): 1–19. http://dx.doi.org/10.1155/2013/953786.

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This work presents an analysis methodology based on the use of the Finite Element Method (FEM) nowadays considered one of the main numerical tools for solving Boundary Value Problems (BVPs). The proposed methodology, so-called cg-FEM (Cartesian grid FEM), has been implemented for fast and accurate numerical analysis of 2D linear elasticity problems. The traditional FEM uses geometry-conforming meshes; however, in cg-FEM the analysis mesh is not conformal to the geometry. This allows for defining very efficient mesh generation techniques and using a robust integration procedure, to accurately integrate the domain’s geometry. The hierarchical data structure used in cg-FEM together with the Cartesian meshes allow for trivial data sharing between similar entities. The cg-FEM methodology uses advanced recovery techniques to obtain an improved solution of the displacement and stress fields (for which a discretization error estimator in energy norm is available) that will be the output of the analysis. All this results in a substantial increase in accuracy and computational efficiency with respect to the standard FEM. cg-FEM has been applied in structural shape optimization showing robustness and computational efficiency in comparison with FEM solutions obtained with a commercial code, despite the fact that cg-FEM has been fully implemented in MATLAB.

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41

Kheira Camellia, Nehar. "Spectral modal modeling by FEM of reinforced concrete framed buildings irregular in elevation." International Review of Applied Sciences and Engineering 12, no. 2 (May 29, 2021): 183–93. http://dx.doi.org/10.1556/1848.2021.00229.

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AbstractThe irregular buildings constitute a large part of urban infrastructure and they are currently adopted in many structures for architectural or esthetic reasons. In contrast, the behavior of these buildings during an earthquake generates a detrimental effect on their regularity in elevation which leads to the total collapse of these structures.The objective of this work is essentially to model reinforced concrete framed buildings irregular in elevation subjected to seismic loads by the Finite Element Method (FEM). This modeling aims to evaluate several parameters: displacements, inter-storey drifts and rigidities, using two dynamic calculation methods; one modal and the other spectral modal. The latter is widely used by engineers.For this purpose, a detailed study of the frames which have several setbacks in elevation is carried out to validate the correct functioning of our FEM calculation code in both cases of modal and modal spectral analyses. The performance, accuracy and robustness of the FEM calculation code produced in this study is shown by the good correlation of the obtained results for the treated frames with those obtained using the ETABS software.

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42

Takayama, Teruou, Takazumi Yamaguchi, Ayumu Saitoh, and Atsushi Kamitani. "FEM-simulation of superconducting linear acceleration system for pellet injection." International Journal of Applied Electromagnetics and Mechanics 64, no. 1-4 (December 10, 2020): 1469–75. http://dx.doi.org/10.3233/jae-209467.

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In order to simulate the high-temperature superconducting (HTS) linear acceleration (SLA) system for the pellet injection, the integration method of the applied magnetic field generated from the acceleration coil has been proposed. To this end, the regularization technique is used in the evaluation of the improper integrals, and simultaneously, a FEM code is developed for analyzing the shielding current density in an HTS film. In addition, the SLA system has been simulated using the code. The results of the computations show that the accuracy of the applied magnetic field is considerably improved. In this sense, the regularization technique is a useful tool. Also by locating the outer coil, the acceleration time during which the pellet speed reaches 5 km/s is about 3.5 times shorter than that of the only use of the inner coil. These results mean that the outer coil is effective in the improvement of the acceleration performance for the SLA system.

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43

SHIGENO, Yoshimasa. "PERFORMANCE ENHANCEMENT OF FEM CODE FOR SOILS AND FOUNDATIONS WITH THREAD PARALLELIZATION." AIJ Journal of Technology and Design 19, no. 41 (2013): 345–50. http://dx.doi.org/10.3130/aijt.19.345.

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44

SHIMAZU, Ryuya, Hiroki YASUTAKA, and Akihiro MATSUDA. "104 Simulation for compression behavior of polymer foam using homogenization FEM code." Proceedings of Ibaraki District Conference 2014.22 (2014): 23–24. http://dx.doi.org/10.1299/jsmeibaraki.2014.22.23.

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45

Herrmann, Martin, and Manfred Geiger. "Extended Capabilities in Metal-Forming Processes by a New Interdisciplinary FEM Code." CIRP Annals 43, no. 1 (1994): 215–18. http://dx.doi.org/10.1016/s0007-8506(07)62199-4.

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46

FUJIOKA, Terutaka. "115 Use of Elastic, Perfectly Plastic FEM in Pressurized Equipment Design Code." Proceedings of The Computational Mechanics Conference 2006.19 (2006): 51–52. http://dx.doi.org/10.1299/jsmecmd.2006.19.51.

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47

Kikuchi, Masanori, and Yuichi Sato. "The Prototype of Expert System for Generation of Single-Purposed FEM Code." Transactions of the Japan Society of Mechanical Engineers Series A 59, no. 558 (1993): 483–88. http://dx.doi.org/10.1299/kikaia.59.483.

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48

Oh, S. I., W. T. Wu, J. P. Tang, and A. Vedhanayagam. "Capabilities and applications of FEM code deform: the perspective of the developer." Journal of Materials Processing Technology 27, no. 1-3 (August 1991): 25–42. http://dx.doi.org/10.1016/0924-0136(91)90042-d.

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49

Meng, Chunfang. "Benchmarking Defmod, an open source FEM code for modeling episodic fault rupture." Computers & Geosciences 100 (March 2017): 10–26. http://dx.doi.org/10.1016/j.cageo.2016.11.014.

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50

NAGASHIMA, Toshio, and Naoki MIURA. "420 Development of elastic-plastic fracture analysis code using the X-FEM." Proceedings of the 1992 Annual Meeting of JSME/MMD 2005 (2005): 295–96. http://dx.doi.org/10.1299/jsmezairiki.2005.0_295.

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