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Journal articles on the topic 'FEM'

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Author: Grafiati

Published: 4 June 2021

Last updated: 7 July 2024

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1

Jin, Wan-Ting, Min Yang, Shuang-Shuang Zhu, and Zhao-Hui Zhou. "Bond-valence analyses of the crystal structures of FeMo/V cofactors in FeMo/V proteins." Acta Crystallographica Section D Structural Biology 76, no. 5 (April 15, 2020): 428–37. http://dx.doi.org/10.1107/s2059798320003952.

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The bond-valence method has been used for valence calculations of FeMo/V cofactors in FeMo/V proteins using 51 crystallographic data sets of FeMo/V proteins from the Protein Data Bank. The calculations show molybdenum(III) to be present in MoFe7S9C(Cys)(HHis)[R-(H)homocit] (where H4homocit is homocitric acid, HCys is cysteine and HHis is histidine) in FeMo cofactors, while vanadium(III) with a more reduced iron complement is obtained for FeV cofactors. Using an error analysis of the calculated valences, it was found that in FeMo cofactors Fe1, Fe6 and Fe7 can be unambiguously assigned as iron(III), while Fe2, Fe3, Fe4 and Fe5 show different degrees of mixed valences for the individual Fe atoms. For the FeV cofactors in PDB entry 5n6y, Fe4, Fe5 and Fe6 correspond to iron(II), iron(II) and iron(III), respectively, while Fe1, Fe2, Fe3 and Fe7 exhibit strongly mixed valences. Special situations such as CO-bound and selenium-substituted FeMo cofactors and O(N)H-bridged FeV cofactors are also discussed and suggest rearrangement of the electron configuration on the substitution of the bridging S atoms.

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2

Jennings, Keith, and Patrick J. Naughton. "Similitude Conditions Modeling Geosynthetic-Reinforced Piled Embankments Using FEM and FDM Techniques." ISRN Civil Engineering 2012 (May 8, 2012): 1–16. http://dx.doi.org/10.5402/2012/251726.

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The numerical modelling of geosynthetic-reinforced piled embankments using both the finite element method (FEM) and finite difference method (FDM) are compared. Plaxis 2D (FEM) was utilized to replicate FLAC (FDM) analysis originally presented by Han and Gabr on a unit cell axisymmetric model within a geosynthetic reinforced piled embankment (GRPE). The FEM and FED techniques were found to be in reasonable agreement, in both characteristic trend and absolute value. FEM consistently replicated the FDM outputs for deformational, loading, and load transfer mechanism (soil arching) response within the reinforced piled embankment structure with a reasonable degree of accuracy. However the FDM approach was found to give a slightly higher reinforcement tension and stress concentration but lower reinforcement strain at the pile cap than FEM, which was attributed to the greater discretize of the model geometry in the FDM than in FEM.

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3

Gupta, Dr A. R. "Comparative analysis of Rectangular Plate by Finite element method and Finite Difference Method." International Journal for Research in Applied Science and Engineering Technology 9, no. 9 (September 30, 2021): 1397–98. http://dx.doi.org/10.22214/ijraset.2021.38152.

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Abstract: Plates are commonly used to support lateral or vertical loads. Before the design of such a plate, analysis is performed to check the stability of plate for the proposed load. There are several methods for this analysis. In this research, a comparative analysis of rectangular plate is done between Finite Element Method (FEM) and Finite Difference Method (FDM). The plate is considered to be subjected to an arbitrary transverse uniformly distributed loading and is considered to be clamped at the two opposite edges and free at the other two edges. The Finite Element Method (FEM) is a numerical technique for finding approximate solutions to boundary value problems for partial differential equations. It is also referred to as finite element analysis (FEA). FEM subdivides a large problem into smaller, simpler, parts, called finite elements. The work covers the determination of displacement components at different points of the plate and checking the result by software (STAAD.Pro) analysis. The ordinary Finite Difference Method (FDM) is used to solve the governing differential equation of the plate deflection. The proposed methods can be easily programmed to readily apply on a plate problem. Keywords: Arbitrary, FEM, FDM, boundary.

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4

Schönauer, Willi, and Torsten Adolph. "FDEM: how we make the FDM more flexible than the FEM." Journal of Computational and Applied Mathematics 158, no. 1 (September 2003): 157–67. http://dx.doi.org/10.1016/s0377-0427(03)00461-8.

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5

KAIHO, Masayuki, Masahiro IKEGAWA, and Chisachi KATO. "FEM/FDM Composite Incompressible Flow Analysis." Transactions of the Japan Society of Mechanical Engineers Series B 63, no. 611 (1997): 2303–8. http://dx.doi.org/10.1299/kikaib.63.611_2303.

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6

Leheman, Pahaiti, Hiroo Shiojiri, and Kunihiko Uno. "Application of PML to Analysis of Dam-Reservoir-Foundation System with Cavitation Using Mixed Formulation." Applied Mechanics and Materials 256-259 (December 2012): 427–40. http://dx.doi.org/10.4028/www.scientific.net/amm.256-259.427.

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Convolution PML is known to have excellent wave absorbing capability, and has been used combined with FDM and FEM. Most of them are splitting type formulation for explicit FEM or FDM. Here implicit non-splitting type convolution PML procedures consistent with mixed formulation FEM as well as displacement based FEM are developed. The resulting coefficient matrices for convolution PML are symmetric if corresponding coefficient matrices of FEM are symmetric. The developed method is applied to dam-reservoir-foundation systems including reservoir cavitation, and the validity of the method is demonstrated.

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7

De Basabe, Jonás D., and Mrinal K. Sen. "Grid dispersion and stability criteria of some common finite-element methods for acoustic and elastic wave equations." GEOPHYSICS 72, no. 6 (November 2007): T81—T95. http://dx.doi.org/10.1190/1.2785046.

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Purely numerical methods based on finite-element approximation of the acoustic or elastic wave equation are becoming increasingly popular for the generation of synthetic seismograms. We present formulas for the grid dispersion and stability criteria for some popular finite-element methods (FEM) for wave propagation, namely, classical and spectral FEM. We develop an approach based on a generalized eigenvalue formulation to analyze the dispersive behavior of these FEMs for acoustic or elastic wave propagation that overcomes difficulties caused by irregular node spacing within the element and the use of high-order polynomials, as is the case for spectral FEM. Analysis reveals that for spectral FEM of order four or greater, dispersion is less than 0.2% at four to five nodes per wavelength, and dispersion is not angle dependent. New results can be compared with grid-dispersion results of some classical finite-difference methods (FDM) used for acoustic or elastic wave propagation. Analysis reveals that FDM and classical FEM require a larger sampling ratio than a spectral FEM to obtain results with the same degree of accuracy. The staggered-grid FDM is an efficient scheme, but the dispersion is angle dependent with larger values along the grid axes. On the other hand, spectral FEM of order four or greater is isotropic with small dispersion, making it attractive for simulations with long propagation times.

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8

Choi, Bong Hak, Woo Jung Kim, Chong Du Cho, Si Young Kwak, and Cheong Kil Choi. "FDM/FEM Hybrid Method with a Systematic Field Data Conversion Procedure for Thermal Stress Analysis in Casting Process." Key Engineering Materials 326-328 (December 2006): 1205–8. http://dx.doi.org/10.4028/www.scientific.net/kem.326-328.1205.

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Noticeably in casting and heat treatment process, computational methods are commonly engaged to predict process and mechanical characteristics such as solidification time, cooling speed, hardness and residual stress, in which analyzing thermo-mechanical coupled process necessitates such heat transfer, microstructure transformation, and stress. This paper proposes a FDM/FEM hybrid method for thermal stress analysis in casting process; taking advantage of each computational method, we use both FDM and FEM to analyze thermal stress. We use FDM to predict temperature distribution and microstructure and then transfer the result data to FEM to calculate thermal stress distribution. In this process, a systematic field data conversion procedure is developed for a successful data transfer. For the validation of this proposed method, numerical examples are presented and compared with antecedent experiment results. The interface data conversion program developed in this study can be used for any other program as well as FDM and FEM.

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9

Gabbert, Ulrich, and Mathias Würkner. "Simulation of cellular structures with a coupled FEM-FCM approach based on CT data." Journal of Computational and Applied Mechanics 16, no. 1 (2021): 57–70. http://dx.doi.org/10.32973/jcam.2021.004.

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The application of cellular structural materials provide new light-weight capabilities in many engineering fields. But the microstructure significantly influences the strength, the fatigue and fracture behavior as well as the life span of a structure made from cellular materials. The current paper illustrates the general idea how to take into account the cellular microstructure in the stress and strain analysis. The detailed geometry, including all discontinuities in the microstructure is available, for instance from measurements provided by the computed tomography (CT). The proposed simulation methodology is a combination of the finite element method (FEM) and the finite cell method (FCM). The FCM approach is applied in regions where discontinuities occur, avoiding a body-fitted mesh. As basis of the FEM-FCM coupling the commercial FEA package Abaqus is used. The theoretical background and the overall simulation workflow along with specific implementation details are discussed. Finally, academic benchmark problems are used to verify the developed coupling method.

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10

Deb, Debasis, and Kamal C. Das. "Bolt-Grout Interactions in Elastoplastic Rock Mass Using Coupled FEM-FDM Techniques." Advances in Civil Engineering 2010 (2010): 1–13. http://dx.doi.org/10.1155/2010/149810.

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Numerical procedure based on finite element method (FEM) and finite difference method (FDM) for the analysis of bolt-grout interactions are introduced in this paper. The finite element procedure incorporates elasto-plastic concepts with Hoek and Brown yield criterion and has been applied for rock mass. Bolt-grout interactions are evaluated based on finite difference method and are embedded in the elasto-plastic procedures of FEM. The experimental validation of the proposed FEM-FDM procedures and numerical examples of a bolted tunnel are provided to demonstrate the efficacy of the proposed method for practical applications.

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11

Cadenas, Carlos E., and Vianey Villamizar. "Comparison of Least Squares FEM, Mixed Galerkin FEM and an Implicit FDM Applied to Acoustic Scattering." Applied Numerical Analysis & Computational Mathematics 1, no. 1 (March 2004): 128–39. http://dx.doi.org/10.1002/anac.200310011.

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12

Zhao, Yu Hong, Wei Ming Yang, and Hua Hou. "A New Kind of FDM/FEM Squeeze Casting Temperature Field Calculation Model." Advanced Materials Research 641-642 (January 2013): 303–8. http://dx.doi.org/10.4028/www.scientific.net/amr.641-642.303.

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A new FDM/ FEM model is developed to simulate the temperature field during the solidification process of squeeze casting. So we can transform the FDM mesh into FEM mesh directly ,then established the relationship of pressure change and melting temperature change and correct the size of melting temperature value and other thermal physical parameters (such as the thermal conductivity)which is related to the temperature ,and establish the temperature and thermal physical parameter relationship to get a data base. The solidification process of AM50A magnesium alloy is simulated. Squeeze casting experiments are also incited for validating the new FDM/FEM model. It is shown that the results of numerical simulation are in agreement with the experimental results.

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13

Ohrt, Ulla Pia. "Fem skriveopskrifter." Sprogforum. Tidsskrift for sprog- og kulturpædagogik 2, no. 4 (February 1, 1996): 35–40. http://dx.doi.org/10.7146/spr.v2i4.116459.

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14

Engelskjøn, Ragnhild, Henning Howlid Wærp, Astrid Utnes, and Elin Stokke. "Fem anmeldelser." Nordlit 1, no. 2 (October 1, 1997): 101. http://dx.doi.org/10.7557/13.2195.

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Magnhild Bruheim: Varlset; Liv Marit Idsø og Anne Marie Seem: Midt i jakta og Liv H Willumsen: Havmannens datter. Regine Normann - et livsløp, anmeldt av Ragnhild EngelskjønTore Hoel: Trygve Gulbranssen og kritikken, anmeldt av Henning Howlid WærpHarald Bache-Wiig: Nye veier til barneboka, anmeldt av Astrid UtnesOlav Solberg: Tekst møter tekst. Kristin Lavransdatter og mellomalderen, anmeldt av Elin Stokke

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15

Corneli, Amy L., Jennifer Deese, Meng Wang, Doug Taylor, Khatija Ahmed, Kawango Agot, Johan Lombaard, et al. "FEM-PrEP." JAIDS Journal of Acquired Immune Deficiency Syndromes 66, no. 3 (July 2014): 324–31. http://dx.doi.org/10.1097/qai.0000000000000158.

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16

Tommy, A., B. Widjaja, and G. M. Hutabarat. "P-y Curve for Estimation Lateral Bearing Capacity of Single Bored Pile in Overconsolidated Soils Using The Three-Dimensional Finite Element Method." IOP Conference Series: Earth and Environmental Science 1249, no. 1 (October 1, 2023): 012028. http://dx.doi.org/10.1088/1755-1315/1249/1/012028.

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Abstract The p-y curve method is widely used to predict piles’ lateral bearing capacity. It assumes independent springs with a non-linear modulus of subgrade reaction for analyzing soil resistance (p) and deflection (y). This study determined the lateral bearing capacity using the three-dimensional finite element method (FEM-3D) and finite difference method (FDM), which was later compared with the loading test results. Therefore, the pile head condition is assumed to be the free-head. To determine the lateral bearing capacity, input the lateral deflection at the pile head. In FEM-3D, the pile and lateral deflection in the pile head is modeled using cluster elements and surface-prescribed horizontal displacements, respectively. On the other hand, in FDM, pile heads and boundary conditions are modeled using displacement and moment. The results of the lateral bearing capacity using FEM-3D provide predictions that are close to the loading test, with a difference of about 4.2%. In contrast, the FDM method produced conservative results due to its reliance on semi-empirical formulas. The ultimate soil resistance (Pult) formula in FDM is more suitable for rigid-pile behavior. The prediction of lateral bearing capacity using FEM-3D provides more accurate results due to its ability to model complex soil-pile interaction. The stress history, soil-pile interaction, and more reliable constitutive models can be modeled in FEM-3D.

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17

Zhuang, Yi Zhou, Tao Ji, and Bao Chun Chen. "Load Distribution for Moment and Shear on Skewed Bridge Structures." Advanced Materials Research 255-260 (May 2011): 1244–47. http://dx.doi.org/10.4028/www.scientific.net/amr.255-260.1244.

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Based on FEA for three bridge models with varying skew angles, the effect of skew angle on the design moment and shear of skewed bridge structures was studied and also compared to AASHTO specifications. The results show that, generally, ASSHTO-LFD covers FEM in moment distribution factor, but a little less in shear distribution factor, and that, however, AASHTO-LRFD reduces moment distribution factor below AASHTO-LFD and near to FEM, but increases shear distribution factor a lot beyond AASHTO-LFD and FEM.

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18

Gundtoft, Martin. "Fem korte om studieteknik – én app bliver til fem." Revy 43, no. 1 (February 21, 2020): 3–5. http://dx.doi.org/10.22439/revy.v43i1.5933.

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19

XUE, B. Y., S. C. WU, W. H. ZHANG, and G. R. LIU. "A SMOOTHED FEM (S-FEM) FOR HEAT TRANSFER PROBLEMS." International Journal of Computational Methods 10, no. 01 (February 2013): 1340001. http://dx.doi.org/10.1142/s021987621340001x.

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By smoothing, via various ways, the compatible strain fields of the standard finite element method (FEM) using the gradient smoothing technique, a family of smoothed FEMs (S-FEMs) has been developed recently. The S-FEM possesses the advantages of both mesh-free methods and the standard FEM and works well with triangular and tetrahedral background cells and elements. Intensive theoretical investigations have shown that the S-FEM models can achieve numerical solutions for many important properties, such as the upper bound solution in strain energy, free from volumetric locking, insensitive to the distortion of the background cells, super-accuracy and super-convergence in displacement or stress solutions or both. Engineering problems, including complex heat transfer problems, have also been analyzed with better accuracy and efficiency. This paper presents the general formulation of the S-FEM for thermal problems in one, two and three dimensions. To examine our formulation, some computational results are compared with those obtained using other established means.

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20

YAGAWA, Genki. "FEM for Researchers and Engineers. A Perspective of FEM." Journal of the Japan Society for Precision Engineering 62, no. 10 (1996): 1369–71. http://dx.doi.org/10.2493/jjspe.62.1369.

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21

YOSHIMURA, Nob. "FEM for Researchers and Engineers. Optimum Design and FEM." Journal of the Japan Society for Precision Engineering 62, no. 10 (1996): 1384–88. http://dx.doi.org/10.2493/jjspe.62.1384.

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22

Bagathi, Sridhar Rao, Vikram Kantaram Pawar, Srinivasa Rao Gummal, and Srirama Chebolu. "Case study of Stress Calculation using Stress Superposition Method for Linear Analysis." International Journal for Research in Applied Science and Engineering Technology 10, no. 3 (March 31, 2022): 1112–20. http://dx.doi.org/10.22214/ijraset.2022.40824.

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Abstract: Stress is one of the critical designing parameters in structural analysis of any mechanical assembly. Calculation of stress and corresponding lead time also has significant role while performing any FEM analysis. This paper explores the method of calculation of stresses using Superposition principle and its applicability when multiple load cases needs to be analyzed. This paper also describes the validation procedure of the FEA results to show the correctness of the stress superposition method against actual FEM analysis. Keywords: Superposition principle, Hand calculation, FEM, linear Analysis, Rigid body elements

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23

Ikegawa, M., M. Kaiho, and C. Kato. "FEM/FDM composite scheme for viscous incompressible flow analysis." Computer Methods in Applied Mechanics and Engineering 112, no. 1-4 (February 1994): 149–63. http://dx.doi.org/10.1016/0045-7825(94)90023-x.

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24

Pang, Guofei, Wen Chen, and Kam Yim Sze. "A Comparative Study of Finite Element and Finite Difference Methods for Two-Dimensional Space-Fractional Advection-Dispersion Equation." Advances in Applied Mathematics and Mechanics 8, no. 1 (December 21, 2015): 166–86. http://dx.doi.org/10.4208/aamm.2014.m693.

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AbstractThe paper makes a comparative study of the finite element method (FEM) and the finite difference method (FDM) for two-dimensional fractional advection-dispersion equation (FADE) which has recently been considered a promising tool in modeling non-Fickian solute transport in groundwater. Due to the non-local property of integro-differential operator of the space-fractional derivative, numerical solution of FADE is very challenging and little has been reported in literature, especially for high-dimensional case. In order to effectively apply the FEM and the FDM to the FADE on a rectangular domain, a backward-distance algorithm is presented to extend the triangular elements to generic polygon elements in the finite element analysis, and a variable-step vector Grünwald formula is proposed to improve the solution accuracy of the conventional finite difference scheme. Numerical investigation shows that the FEM compares favorably with the FDM in terms of accuracy and convergence rate whereas the latter enjoys less computational effort.

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25

Kjelstrup, Christian. "Fem flyktninger forteller." Samtiden 129, no. 01 (March 5, 2021): 66–93. http://dx.doi.org/10.18261/issn1890-0690-2021-01-09.

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26

Malagarriga, Teresa. "Fem música junts." Comunicació educativa, no. 22 (January 1, 2009): 17. http://dx.doi.org/10.17345/comeduc200917-19.

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La música és complexa. Aprendre música per poder-ne fer ús requereix temps, ja que en l’activitat musical hi ha implicades habilitats que cal educar, al mateix temps que la música com a producte cultural s’ha de conèixer, saber percebre, analitzar i valorar. És tot un aprenentatge que pot durar al llarg de la vida, però que té un aspecte vertaderament interessant: i és que, en qualsevol moment i nivell que s’estigui, la música pot arribar a la sensibilitat i a la intel·ligència de qui vol comprendre-la i gaudir-ne, provocant vivències per sentir i aportant recursos per comunicar-se amb els altres i entendre algunes de les dimensions que aquest llenguatge conté.

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27

Năstăsescu, Vasile. "FEM or SPH ?" Journal of Engineering Sciences and Innovation 1, no. 1 (August 30, 2016): 34–48. http://dx.doi.org/10.56958/jesi.2016.1.1.34.

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This paper brings, in front of the reader, some aspects regarding the using of those numerical methods, perhaps most used, for analysis of the fluids and structures. Next to the FEM (Finite Element Method), new numerical methods appeared, among these, the methods named meshfree methods are nowadays most used. The SPH (Smoothed Particle Hydrodynamics) method belongs to this category of meshfree method, being the most used in different fields like astrophysical phenomena, fluid dynamics, structure dynamics and others. The paper put face to face some results obtained by FEM and SPH, so the reader can alone to appreciate which method is better in a given problem or other. For to facilitate analysis and to understand the results, the fundamentals of SPH method are presented. In contrast to FEM, the SPH method is less known and less used in Romania. This finding underlies the emergence of this article. The answer to the title question depends on every one and it is influenced by many factors. Finally, the author suggests an answer by a correction of the title question: FEM and SPH or FEM with SPH.

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28

Ivan, Ingvild H. "«Fem på kullet»." Norsk tidsskrift for ernæring 19, no. 3 (September 2021): 1. http://dx.doi.org/10.18261/ntfe.19.3.12.

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29

Mauck, C. "Fem Cap studies." European Journal of Contraception & Reproductive Health Care 4, no. 3 (January 1999): 181. http://dx.doi.org/10.3109/13625189909040812.

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30

Firmin, A. "Early FEM pioneers." Finite Elements in Analysis and Design 1, no. 4 (December 1985): 388–89. http://dx.doi.org/10.1016/0168-874x(85)90034-4.

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31

Tinsley Oden, J. "The best FEM." Finite Elements in Analysis and Design 7, no. 2 (November 1990): 103–14. http://dx.doi.org/10.1016/0168-874x(90)90002-v.

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32

Olsson, Erik, and Magnus Ehn. "Finn fem felimplementeringar." Europarättslig tidskrift, no. 2024 1 (March 11, 2024): 119–26. http://dx.doi.org/10.53292/8f191eb5.5ad48f30.

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33

Belghanami, Rabab, Yazid Abdelaziz, Fodil Hammadi, Khaled Bendahane, and Souad Benkheira. "X-FEM and FEM for Discontinuities Modelling: a Comparative Study." International Review of Mechanical Engineering (IREME) 11, no. 1 (January 31, 2017): 46. http://dx.doi.org/10.15866/ireme.v11i1.10384.

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34

Aiello, Giovanni, Salvatore Alfonzetti, Giuseppe Borzì, Santi Agatino Rizzo, and Nunzio Salerno. "A comparison between hybrid methods: FEM-BEM versus FEM-DBCI." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 32, no. 6 (November 11, 2013): 1901–11. http://dx.doi.org/10.1108/compel-10-2012-0263.

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35

IBARAKI, Junji, and Hisao NIIKURA. "FEM for Researchers and Engineers. Computer Technology for Personal FEM." Journal of the Japan Society for Precision Engineering 62, no. 10 (1996): 1372–75. http://dx.doi.org/10.2493/jjspe.62.1372.

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36

SHIMIZU, Fumiya, and Kenji NIIYAMA. "FEM for Researchers and Engineers. FEM under the Windows Environment." Journal of the Japan Society for Precision Engineering 62, no. 10 (1996): 1376–79. http://dx.doi.org/10.2493/jjspe.62.1376.

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37

Cai, Yun-Zhu, and Yu-Ching Wu. "Two-scale modeling of granular materials: A FEM-FEM approach." Frontiers of Structural and Civil Engineering 7, no. 3 (August 5, 2013): 304–15. http://dx.doi.org/10.1007/s11709-013-0213-y.

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38

Saldaña-Robles, Alberto, Eduardo Aguilera-Gómez, Héctor Plascencia-Mora, Elías R. Ledesma-Orozco, Juan F. Reveles-Arredondo, and Noé Saldaña-Robles. "FEM burnishing simulation including roughness." Mechanik, no. 2 (February 2015): 125/79–125/91. http://dx.doi.org/10.17814/mechanik.2015.2.79.

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39

Wang, Li Ping, Jing Wei Piao, Ze Ning Xu, Chang Hua Jiang, and Xin Bi. "FEM Analysis on the Frame of Cross Roll Straightener for Steel Pipes." Advanced Engineering Forum 2-3 (December 2011): 848–51. http://dx.doi.org/10.4028/www.scientific.net/aef.2-3.848.

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The intensity and rigidity of cross-roll pipe straightener frame are analyzed with the Finite Element Method (FEM) and the stress of the frame is tested. The FEM results are compared with experimental results and the accuracy and rationality of FEA results are verified. The analysis results have significant guidance to design and transformation the structural type of cross roll straightener and its frame.

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40

ISHIKAWA, Mikihito, Toshihito OHMI, A. Toshimitsu YOKOBORI Jr., and Masaaki NISHIMURA. "OS1010 The Hydrogen Diffusion Analysis by Finite Element Method and Finite Difference Method." Proceedings of the Materials and Mechanics Conference 2014 (2014): _OS1010–1_—_OS1010–3_. http://dx.doi.org/10.1299/jsmemm.2014._os1010-1_.

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41

Liao, Dun Ming, Li Liang Chen, Jian Xin Zhou, and Rui Xiang Liu. "Numerical Simulation of Thermal Stress Fields of Steel Casting." Advanced Materials Research 179-180 (January 2011): 1118–23. http://dx.doi.org/10.4028/www.scientific.net/amr.179-180.1118.

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Many defects relative to stress occur during the complicate casting process, such as hot tearing, residual stress concentration and distortion. Modeling of casting thermal stress during casting solidification process is of great significance to predict and analyze casting stress defects. Involving too many complex influencing factors, the stress simulation is very difficult and retains a hot spot of macro simulation in foundry engineering. Currently most researchers adopt integrated FDM/FEM method, i.e. using finite difference method (FDM) to calculate solidification and heat transferring, while finite element method (FEM) to simulate stress. Some universal commercial FEA packages are usually adopted. This study has tried two kinds of approaches to simulate casting thermal stress. One is based on ANSYS, a well-known powerful FEA analysis software. Another is to develop an independent own copyrighted casting stress simulation system based on FDM. The routes of these two methods were given respectively. To calibrate the simulation system, a stress frame sample and a real practical casting were simulated and pouring experiment was also carried on. The results of simulation were in agreement with the experiment results and practical cases. It indicates that these two approaches can all meet demands. When adopting FDM method, thermal analysis and stress analysis can use the same FD model, which can avoid the nodes matching between different models and reduce the errors of thermal load transferring. It makes the simulation of fluid-flow field, temperature field and stress field unify into one model. This system takes full advantages of mature FDM technology and can be used to simulate the forming of residual stress and predict the occurrence of hot tearing.

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42

Estêvão, João M. C., and Ana S. Carreira. "USING THE NEW FIBRE CONTACT ELEMENT METHOD FOR DYNAMIC STRUCTURAL ANALYSIS." Engineering Structures and Technologies 7, no. 1 (December 15, 2015): 24–38. http://dx.doi.org/10.3846/2029882x.2015.1087346.

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In literature, there are many methods proposed for structural analysis based on discrete element formulations, mainly for nonlinear problems. One of these new methods is the Fibre Contact Element Method (FCEM). Many of these methods have been used for structural dynamic analysis problems. However, there are some questions about their precision in capturing the dynamic elastic response of structures when comparing to methods based on continuous models, like the well known Finite Element Method (FEM). For this reason, the results obtained with FCEM were extensively compared with FEM results and with laboratorial tests, to better understand the performance of this new method in capturing the elastic dynamic response of structures. Results indicate that this kind of discrete methods are able to determine the vibration modes of a structure with equal or better precision level than the obtained with FEM. FCEM was also used to capture the dynamic response of a reinforced concrete frame with infill walls, as a way to show the method capabilities in reproducing the dynamic behaviour of structures that have an almost continuous mass distribution.

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43

Xie, Ping, Rongjun Zhang, Junjie Zheng, and Ziqian Li. "AUTOMATIC SAFETY EVALUATION AND VISUALIZATION OF SUBWAY STATION EXCAVATION BASED ON BIM-FEM/FDM INTEGRATED TECHNOLOGY." JOURNAL OF CIVIL ENGINEERING AND MANAGEMENT 28, no. 4 (April 7, 2022): 320–36. http://dx.doi.org/10.3846/jcem.2022.16727.

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With the progressive promotion of BIM technology in collaborative design and engineering data management, there are large amounts of project information available for intelligent construction, engineering computation and design optimization. In the construction of subway station, BIM technology is still not mature and the engineering design is generally separate from the engineering safety evaluation. Thus, this paper proposed a technology that integrates BIM and numerical simulation (BIM-FEM/FDM integrated technology) to solve the problem of separation between engineering design and computation. A three-dimensional parametric modeling of subway station excavation was first carried out using the Revit® modeling software. Afterward, a FEM/FDM-process oriented data conversion interface was developed to extract and process the critical information from the parametric BIM model for numerical simulation. Then, under the impetus of an auto-simulation interface, the safety evaluation of subway station excavation was realized automatically and visualized graphically. The research of the BIM-FEM/FDM integrated technology presented in this paper has established a supporting platform to achieve the integration of BIM-based design and safety evaluation for subway station excavation.

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44

Brauer, David J., Gerd Hasselkuß, Sibbele Hietkamp, Herbert Sommer, and Othmar Stelzer. "Lineare Oligophosphaalkane, XI [1] Stabilisierung von Phosphiniden, PH, im Clusteryerband — Röntgenstrukturanalyse von Fe4(CO)10[(μ2-PPri)2CH2](μ2-PPriMe)(μ2-H)(μ4-PH)." Zeitschrift für Naturforschung B 40, no. 7 (July 1, 1985): 961–67. http://dx.doi.org/10.1515/znb-1985-0719.

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Abstract Reaction of HPriP-CH2-PPriH with Fe2(CO)9 in a molar ratio of 1:2 produces a mixture of cluster compounds from which Fe4(CO)10[(μ2-PPri)2CH2](μ2-PPriMe)(μ2-H)(μ4-PH) could be isolated by liquid chromatography. X-ray structural analysis shows a planar trapezoid arrangement for the four iron atoms (Fe1 -Fe2 2,648(1), Fe2 -Fe3 2,790(1), Fe3 -Fe4 2,643(1), Fe1 --Fe4 4,109(1) Å ) capped by the novel bidentate phosphido bridge (μ2-PPri)2CH2 and the unsubstituted phosphinidene, PH( Fe1 - P4 2,284(1), Fe2 - P4 2,410(1), Fe3 - P4 2,405(1), Fe4 - P4 2,288(1), P4 - H1 1,39(4) Å).

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45

Xiangyang, Cui, Li Guangyao, Zheng Gang, and Wu Suzhen. "NS-FEM/ES-FEM for contact problems in metal forming analysis." International Journal of Material Forming 3, S1 (April 2010): 887–90. http://dx.doi.org/10.1007/s12289-010-0910-1.

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46

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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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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47

Trung, Nguyen Thoi, and Nguyen Xuan Hung. "About applying directly the alpha finite element method (\(\alpha\)FEM) for solid mechanics using triangular and tetrahedral elements." Vietnam Journal of Mechanics 32, no. 4 (December 22, 2010): 235–46. http://dx.doi.org/10.15625/0866-7136/32/4/292.

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An alpha finite element method (\(\alpha\)FEM) has been recently proposed to compute nearly exact solution in strain energy for solid mechanics problems using three-node triangular (\(\alpha\)FEM-T3) and four-node tetrahedral (\(\alpha\)FEM-T4) elements. In the \(\alpha\)FEM, a scale factor \(\alpha \in [0, 1]\) is used to combine the standard fully compatible model of the FEM with a quasi-equilibrium model of the node-based smoothed FEM (NS-FEM). This novel combination of the FEM and NS-FEM makes the best use of the upper bound property of the NS-FEM and the lower bound property of the standard FEM. This paper concentrates on applying directly the \(\alpha\)FEM for solid mechanics to obtain the very accurate solutions with a suitable computational cost by using \(\alpha = 0.6\) for 2D problems and \(\alpha = 0.7\) for 3D problems.

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48

Zoric, Josip, and Ivo Roušar. "Calculation of the Primary Current Distribution in Cells with Curved Electrodes Using the Finite Difference, Conservative Scheme, and Finite Element Methods." Collection of Czechoslovak Chemical Communications 61, no. 11 (1996): 1563–84. http://dx.doi.org/10.1135/cccc19961563.

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The primary current distribution was calculated in cells with a curvilinear shape of the electrodes by the finite difference (FDM), the conservative scheme (CS), and the finite element methods (FEM). These methods were used for the solutions of the Laplace equation (LE) for a 2D cross-section of a cell consisting of two concentric cylinders (tubes) as electrodes and the inter-electrode space filled with electrolyte. For this cell the analytical solution of LE is known. The local current density on the approximated shape of the electrodes was calculated. The error in the normalized local current density relative to the mean was 5.2%, 52% or 0.2% with FDM using a 64 o 64 mesh, CS using 64 o 64 mesh or FEM using 969 nodes, respectively. Also the boundary element method (BEM) has been used. With 199 elements at the electrode the error in the normalized current density was 0.2%. Taking into account the simplicity of programming and the possibility of using previously developed modules in other calculations, FEM and BEM showed the best performance.

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Wu, S. W., M. Li, C. Jiang, and G. R. Liu. "Solution Bounds and Nearly Exact Solutions for 3D Nonlinear Problems of Large Deformation of Solids Using S-Fem." International Journal of Computational Methods 17, no. 02 (October 24, 2019): 1845007. http://dx.doi.org/10.1142/s021987621845007x.

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In this work, a three-dimensional (3D) nonlinear smoothed finite element method (S-FEM) solver is developed for large deformation problems. Node-based and face-based S-FEM using automatically generable four-noded tetrahedral elements (NS-FEM-Te4 and FS-FEM-Te4) are adopted to find the solution bounds in strain energy. The lower bound solutions are obtained using FEM-Te4 and FS-FEM-Te4, while the upper bound solutions are obtained using NS-FEM-Te4. A combined [Formula: see text]S-FEM-Te4 with a scaling factor [Formula: see text] that controls the combination is constructed to find nearly exact solutions for the nonlinear solids mechanics problems through adjusting [Formula: see text]. This is achieved using the property that a successive change of scaling factor [Formula: see text] can make the model transform from “overly-stiff” to “overly-soft”. Considering the properties of FS-FEM and NS-FEM, a selective FS/NS-FEM-TE4 is also used to solve 3D nonlinear large deformation problems, which produces a lower bound in strain energy. Hyperelastic Mooney–Rivlin and Ogden materials are both used in this study. Numerical examples reveal that S-FEM-Te4 is an effective method for obtaining solution bounds together with the standard FEM, and the FS-FEM-Te4, NS-FEM-Te4 and selective FS/NS-FEM-TE4 are robust with the high accuracy and computational efficiency for large deformation nonlinear problems.

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50

Gaudet, J., I. VanderElst, and A. M. Spence. "Post-transcriptional regulation of sex determination in Caenorhabditis elegans: widespread expression of the sex-determining gene fem-1 in both sexes." Molecular Biology of the Cell 7, no. 7 (July 1996): 1107–21. http://dx.doi.org/10.1091/mbc.7.7.1107.

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The fem-1 gene of C. elegans is one of three genes required for all aspects of male development in the nematode. Current models of sex determination propose that the products of the fem genes act in a novel signal-transduction pathway and that their activity is regulated primarily at the post-translational level in somatic tissues. We analyzed the expression of fem-1 to determine whether it revealed any additional levels of regulation. Both XX hermaphrodites and XO males express fem-1 at approximately constant levels throughout development. Somatic tissues in hermaphrodites adopt female fates, but they nonetheless express fem-1 mRNA and FEM-1 protein, suggesting that the regulation of fem-1 activity is post-transcriptional and probably post-translational. A compact promoter directs functional expression of fem-1 transgenes, as assayed by their masculinizing activity in fem-1 mutants. Activity also requires any two or more introns, suggesting that splicing may enhance fem-1 expression. The minimal noncoding sequences required for activity of fem-1 transgenes suffice to direct expression of a fem-1::lacZ reporter gene in all somatic tissues in both sexes. Many fem-1 transgenes, including those that rescue male somatic development in fem-1 mutants, paradoxically feminize the germline. We suggest that they do so by interfering with the germline expression of the endogenous fem-1 gene.

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