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Auteur : Grafiati

Publié le 19 octobre 2024

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1

Szturomski, B., et R. Kiciński. « Strength analysis of warship hull’s bottom loaded by the pressure wave from a non-contact explosion of sea mine explosion of sea mine ». Journal of Physics : Conference Series 2130, n^o 1 (1 décembre 2021) : 012008. http://dx.doi.org/10.1088/1742-6596/2130/1/012008.

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Abstract The study was based on the analysis of stamina of steel flat bottom section of transport warships, burdened by the spherical pressure wave from the non-contact explosion of TNT at a distance of 20 m under the keel. This study aims to determine the TNT mass required to break the hull. The task was solved by finite element method (FEM) explicite using CAE program [1], in which the hull’s bottom was modelled as thin shell space. The hull’s burden with pressure wave was modelled as a pressure impulse specified by the formula introduced by T.L. Geers, K.S. Hunter and R.S. Price [2]. To describe the material properties, considering high-speed strain, the Johnson-Cook model was used [3]. Therefore, the main goal of the hereby paper is to present how to correctly model the impact of large, concentrated masses of the ship’s equipment on its hull. The study presents the results of the calculated stress and strain states of the analysed section of the construction of the hull.

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Koide, M., H. Heguri, T. Kamegawa, Y. Nakajima et H. Ogawa. « Optimization for Motorcycle Tire Using Explicit FEM ». Tire Science and Technology 29, n^o 4 (1 octobre 2001) : 230–43. http://dx.doi.org/10.2346/1.2135241.

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Abstract A new procedure of the crown contour design for the motorcycle tire is proposed in this paper. The explicit finite element method (FEM) combined with the neural network has been utilized to optimize the cornering property of the motorcycle tire. For the motorcycle tire, the camber thrust is one of the most important cornering characteristics. The explicit FEM has been utilized for the camber thrust prediction to avoid poor numerical stability that will be caused by the implicit FEM. The prediction of the camber thrust that the results of finite element analyses (FEA) were in good agreement with the experimental results has been verified. For the approximation of the design space in the optimization, the neural network has been utilized to circumvent the multipeak and huge CPU time problems. The objective functions of the optimization were both the linearity of camber thrust and the uniformity of pressure distribution in the contact area. The design variable was the crown contour expressed by three variables, and the number of variables was defined in consideration of decreasing the number of FEA. The procedure has been applied to the practical development of a motorcycle tire and verified to be an effective method to improve the handling performance at the proving ground.

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Leheman, Pahaiti, Hiroo Shiojiri et Kunihiko Uno. « Application of PML to Analysis of Dam-Reservoir-Foundation System with Cavitation Using Mixed Formulation ». Applied Mechanics and Materials 256-259 (décembre 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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HAMA, Takayuki, Motoo ASAKAWA, Hiroshi FUKIHARU et Akitake MAKINOUCHI. « Simulation of Tube Hydroforming by Static Explicit FEM ». Proceedings of the Materials and processing conference 2003.11 (2003) : 315–16. http://dx.doi.org/10.1299/jsmemp.2003.11.315.

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Ma, Ninshu, et Yasuyoshi Umezu. « Application of explicit FEM to welding deformation ». Welding International 23, n^o 1 (janvier 2009) : 1–8. http://dx.doi.org/10.1080/09507110802348884.

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IKUSHIMA, Kazuki, Shinsuke ITOH et Masakazu SHIBAHARA. « Development of Parallelized Idealized Explicit FEM Using GPU ». QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 31, n^o 1 (2013) : 23–32. http://dx.doi.org/10.2207/qjjws.31.23.

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Hama, Takayuki, Motoo Asakawa, Hiroshi Fukiharu et Akitake Makinouchi. « Simulation of Hammering Hydroforming by Static Explicit FEM ». ISIJ International 44, n^o 1 (2004) : 123–28. http://dx.doi.org/10.2355/isijinternational.44.123.

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8

Shahbeyk, Sharif, Mohammadreza Yaghoobi et Abolhassan Vafai. « Explicit dynamics X-FEM simulation of heterogeneous materials ». Finite Elements in Analysis and Design 56 (septembre 2012) : 52–79. http://dx.doi.org/10.1016/j.finel.2012.02.010.

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9

Jiang, Chen, Xu Han, Zhi-Qian Zhang, G. R. Liu et Guang-Jun Gao. « A Locking-Free Face-Based S-FEM via Averaging Nodal Pressure using 4-Nodes Tetrahedrons for 3D Explicit Dynamics and Quasi-statics ». International Journal of Computational Methods 15, n^o 06 (septembre 2018) : 1850043. http://dx.doi.org/10.1142/s0219876218500433.

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A locking-free face-based S-FEM, combined with the Averaging Nodal Pressure (ANP) technique, is proposed to solve explicit dynamics of geometric nonlinear nearly-incompressible solids, using simplest linear tetrahedral elements (FS-FEM/ANP-T4). An explicit Adaptive Dynamic Relaxation (ADR) technique is also implemented for the analysis of quasi-static problems. Our studies have found that the proposed method has better accuracy and convergence compared to the standard FEM with ANP (FEM/ANP) and previous selective face-based and Node-based S-FEM (FS/NS-FEM). With the ADR, proposed method can reach the nonlinear quasi-static response much faster than the conventional explicit dynamic relaxation. No temporal instability is observed in FS-FEM/ANP-T4 in large deformation case. In addition, FS-FEM/ANP-T4 also equips the robustness against mesh distortion as FS/NS-FEM but uses less computational time. It has also been applied to solve a practical 3D problem, a rubber hanger for the car exhaust system. FS-FEM/ANP-T4 can be considered as an excellent numerical method other than FS/NS-FEM for simulating rubber-like materials.

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10

Tang, S., S. Qin et R. O. Weber. « Numerical studies on 2-dimensional reaction-diffusion equations ». Journal of the Australian Mathematical Society. Series B. Applied Mathematics 35, n^o 2 (octobre 1993) : 223–43. http://dx.doi.org/10.1017/s0334270000009140.

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AbstractVarious initial and boundary value problems for a 2-dimensional reaction-diffusion equation are studied numerically by an explicit Finite Difference Method (FDM), a Galerkin and a Petrov-Galerkin Finite Element Method (FEM). The results not only show the transition processes from different local initial disturbances to quasitravelling waves, but also demonstrate the long term behaviour of the solutions, which is determined by the system itself and does not depend on the details of the initial disturbances.

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IKUSHIMA, Kazuki, Shinsuke ITOH et Masakazu SHIBAHARA. « Heat Conduction Analysis of Welding Using Idealized Explicit FEM ». QUARTERLY JOURNAL OF THE JAPAN WELDING SOCIETY 31, n^o 4 (2013) : 153s—157s. http://dx.doi.org/10.2207/qjjws.31.153s.

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12

MA, Ninshu, et Nobuhiko SUGITOMO. « Dynamic Explicit FEM and Simulation on Sheet Metal Forming ». Journal of the Japan Society for Technology of Plasticity 47, n^o 540 (2006) : 29–34. http://dx.doi.org/10.9773/sosei.47.29.

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FUKIHARU, Hiroshi. « Static Explicit FEM and Simulation on Sheet Metal Forming ». Journal of the Japan Society for Technology of Plasticity 48, n^o 558 (2007) : 610–14. http://dx.doi.org/10.9773/sosei.48.610.

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14

Xia, Yu, Xiao Lian Zhao, Da Wei Wang et Chong Qing Zhang. « Failure Process Analysis of Arch Dam with Explicit FEM ». Applied Mechanics and Materials 170-173 (mai 2012) : 2043–46. http://dx.doi.org/10.4028/www.scientific.net/amm.170-173.2043.

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Arch dam’s failure is a super nonlinear irreversible process. The research on process of it would give quite important information for safety evaluation. In this paper, it analyses overload of the highest RCC arch dam of the world with explicit FEM and shows the process of dam’s failure from normal operation, local deformation to overall failure by water-level overcharge method. It gives a more direct and precise safety factor. This method is also can be used in other structures.

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Yu, Hai-liang, Xiang-hua Liu, Xian-ming Zhao, Di Wu et Y. Kusaba. « Explicit Dynamic FEM Analysis of Multipass Vertical-Horizontal Rolling ». Journal of Iron and Steel Research International 13, n^o 3 (mars 2006) : 26–30. http://dx.doi.org/10.1016/s1006-706x(06)60056-3.

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Wallmeier, Malte, Eric Linvill, Marek Hauptmann, Jens-Peter Majschak et Sören Östlund. « Explicit FEM analysis of the deep drawing of paperboard ». Mechanics of Materials 89 (octobre 2015) : 202–15. http://dx.doi.org/10.1016/j.mechmat.2015.06.014.

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Toropov, V. V., A. A. Filatov et A. A. Polynkin. « Multiparameter structural optimization using FEM and multipoint explicit approximations ». Structural Optimization 6, n^o 1 (mars 1993) : 7–14. http://dx.doi.org/10.1007/bf01743169.

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18

Shaozhong, Xu, Wang Cheng et Liu Xiaohu. « An improved contact-impact algorithm for explicit integration FEM ». Acta Mechanica Sinica 18, n^o 6 (décembre 2002) : 649–51. http://dx.doi.org/10.1007/bf02487967.

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19

Kuzmin, Dmitri. « Explicit and implicit FEM-FCT algorithms with flux linearization ». Journal of Computational Physics 228, n^o 7 (avril 2009) : 2517–34. http://dx.doi.org/10.1016/j.jcp.2008.12.011.

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20

Zhang, Jinao, et Sunita Chauhan. « Real-time computation of bio-heat transfer in the fast explicit dynamics finite element algorithm (FED-FEM) framework ». Numerical Heat Transfer, Part B : Fundamentals 75, n^o 4 (3 avril 2019) : 217–38. http://dx.doi.org/10.1080/10407790.2019.1627812.

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21

Iida, Ryoya, Yuki Onishi et Kenji Amaya. « A Stabilization Method of F-barES-FEM-T4 for Dynamic Explicit Analysis of Nearly Incompressible Materials ». International Journal of Computational Methods 16, n^o 08 (29 août 2019) : 1850121. http://dx.doi.org/10.1142/s0219876218501219.

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A stabilization method of the F-bar aided edge-based smoothed finite element method with four-node tetrahedral elements (F-barES-FEM-T4), which is named SymF-barES-FEM-T4, is proposed. The proposed formulation aims to remove the instability associated with energy divergence of F-barES-FEM-T4 in dynamic analysis. The stiffness matrix of F-barES-FEM-T4 is asymmetric due to the adoption of F-bar method, meanwhile that of SymF-barES-FEM-T4 is symmetrized so that the dynamics system of the formulation is stabilized. The differences between F-barES-FEM-T4 and SymF-barES-FEM-T4 in their formulations are only the definition of the [Formula: see text]-matrix and the corresponding volume in the internal force calculation. Therefore, SymF-barES-FEM-T4 is applicable in dynamic explicit schemes as is the case with F-barES-FEM-T4. A few demonstrations of dynamic explicit analysis for nearly incompressible materials reveal that SymF-barES-FEM-T4 conserves the total energy and does not cause energy divergence in the free vibration problems. They also reveal that SymF-barES-FEM-T4 has a moderate capability in the suppression of pressure checkerboarding: worse than F-barES-FEM-T4 but better than Selective ES/NS-FEM-T4.

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22

Seta, E., T. Kamegawa et Y. Nakajima. « Prediction of Snow/Tire Interaction Using Explicit FEM and FVM ». Tire Science and Technology 31, n^o 3 (1 juillet 2003) : 173–88. http://dx.doi.org/10.2346/1.2135267.

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Abstract A three-dimensional prediction model has been developed in which the interaction between snow and a rolling tire with tread pattern is considered. An explicit finite element method (FEM) and a finite volume method (FVM) are used to model tire and snow respectively. Snow deformation is calculated by the Eulerian formulation to solve the complex interaction between snow and tire tread pattern. Coupling between a tire and snow is automatically computed by the coupling element. Numerical modeling of snow is essential to the tire performance prediction on snow. In this study, snow is assumed to be homogeneous and considered to be an elasto-plastic material. The Mohr-Coulomb yield model, in which the yield stress is a single function of pressure, is adopted. This function is investigated by tire traction tests under a wide range of tire contact pressures using several tires with different inflation pressures and patterns. The predicted results using the Mohr-Coulomb yield model are compared with those using the Capped Drucker-Pragger and the Cam-Clay yield models. Snow traction of a tire featuring different tread patterns is simulated by this technology. Results are shown to be in good qualitative agreement with experimental data.

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Swierczynski, Piotr, et Barbara Wohlmuth. « Energy-corrected FEM and explicit time-stepping for parabolic problems ». ESAIM : Mathematical Modelling and Numerical Analysis 53, n^o 6 (18 octobre 2019) : 1893–914. http://dx.doi.org/10.1051/m2an/2019038.

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The presence of corners in the computational domain, in general, reduces the regularity of solutions of parabolic problems and diminishes the convergence properties of the finite element approximation introducing a so-called “pollution effect”. Standard remedies based on mesh refinement around the singular corner result in very restrictive stability requirements on the time-step size when explicit time integration is applied. In this article, we introduce and analyse the energy-corrected finite element method for parabolic problems, which works on quasi-uniform meshes, and, based on it, create fast explicit time discretisation. We illustrate these results with extensive numerical investigations not only confirming the theoretical results but also showing the flexibility of the method, which can be applied in the presence of multiple singular corners and a three-dimensional setting. We also propose a fast explicit time-stepping scheme based on a piecewise cubic energy-corrected discretisation in space completed with mass-lumping techniques and numerically verify its efficiency.

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Soares, Delfim, et Francisco Célio de Araújo. « An explicit direct FEM–BEM coupling procedure for nonlinear dynamics ». Engineering Analysis with Boundary Elements 103 (juin 2019) : 94–100. http://dx.doi.org/10.1016/j.enganabound.2019.03.003.

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Xiao, Yihua, et Hecheng Wu. « An Explicit Coupled Method of FEM and Meshless Particle Method for Simulating Transient Heat Transfer Process of Friction Stir Welding ». Mathematical Problems in Engineering 2020 (20 mai 2020) : 1–16. http://dx.doi.org/10.1155/2020/2574127.

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Friction stir welding (FSW) is a favorable welding technology for aluminum alloys. The FSW process involves complex heat and mass transfer. Explicit meshless particle methods are currently popular methods for simulating the process, but they require expensive computational cost. Coupling explicit finite element method (FEM) and meshless particle methods can ease the problem by making use of high efficiency of FEM and advantages of meshless particle methods. Though many efforts have been made to couple FEM and meshless particle methods for transient dynamics problems, coupling them for transient heat transfer problems is seldom addressed. In this work, we focus on treating this problem. We developed an explicit coupled method of FEM and the meshless particle method presented in a previous work and used it to simulate the thermal process during FSW. In the method, FEM using lumped heat capacity matrix and low-order numerical integration is constructed to obtain high efficiency. A new coupling algorithm is proposed to link thermal calculations of the weak-form FEM and the strong-form meshless particle method. Forward Euler method is used for time integration to achieve an explicit algorithm. The coupled method is used to calculate a numerical example having analytical solution. Calculated results show that it can achieve a good accuracy. The method is employed to simulate FSW of Al 6061-T6 plates. It predicts thermal cycles in good agreement with experimental results. It shows an accuracy comparable to that of the meshless particle method while having a higher efficiency than the latter.

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Rong, Xin, Ruiping Niu et Guirong Liu. « Stability Analysis of Smoothed Finite Element Methods with Explicit Method for Transient Heat Transfer Problems ». International Journal of Computational Methods 17, n^o 02 (24 octobre 2019) : 1845005. http://dx.doi.org/10.1142/s0219876218450056.

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In this paper, transient heat transfer problems are analyzed using the smoothed finite element methods (S-FEMs) with explicit time integration. For a numerical method with spatial discretization, the computational cost per time step in the explicit method is less than that in the implicit method, but the time step is much smaller in the explicit analysis than that in the implicit analysis when the same mesh is used. This is because the stability is of essential importance. This work thus studies the stability of S-FEMs, when applied to transient heat transfer problems. Relationships are established between the critical time steps used in S-FEMs with the maximum eigenvalues of the thermal stiffness (conduction) matrix and mass matrix. It is found that the critical time step relates to the “softness” of the model. For example, node-based smoothed finite element method (NS-FEM) is softer than edge-based smoothed finite element method (ES-FEM), which leads to that the critical time step of NS-FEM is larger than that of ES-FEM. Because computing the eigenvalues and condition numbers of the stiffness matrices is very expensive but valuable for stability analysis, we proposed a concise and effective algorithm to estimate the maximum eigenvalue and condition number. Intensive numerical examples show that our scheme for computing the critical time step can work accurately and stably for the explicit method in FEM and S-FEMs.

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Jamli, M. R., Ahmad Kamal Ariffin, D. A. Wahab, A. E. Ismail et I. A. Shah. « Sensitivity of Modeling in Sheet Metal Three-Point Cyclic Bending ». Applied Mechanics and Materials 165 (avril 2012) : 187–91. http://dx.doi.org/10.4028/www.scientific.net/amm.165.187.

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The aim of this paper is to examine the modeling sensitivity of the three-point bending test by using finite element method (FEM). Three-point bending test has been frequently used to determine the material hardening parameters of sheet metal. As a part of the parameter identification, three-point bending has been simulated and analyzed using FEM. To minimize the computation time, shell element was used to model the sheet metal. The analysis includes implicit and explicit procedures. In particular, this study examines the effect of FEM results by varying the element type, mesh density, and number of integration point. It is shown that the implicit procedure analyze the simulation with very less computation time compared to the explicit procedure. The results also show that only the number of integration point has significant effect on the simulation in both implicit and explicit procedures.

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Kaselouris, Evaggelos, Theodoros Papadoulis, Elenh Variantza, Andreas Baroutsos et Vasilios Dimitriou. « A Study of Explicit Numerical Simulations in Orthogonal Metal Cutting ». Solid State Phenomena 261 (août 2017) : 339–46. http://dx.doi.org/10.4028/www.scientific.net/ssp.261.339.

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The capability of the explicit numerical methods to simulate accurately the real cutting process is investigated in this research work. Smoothed particle hydrodynamics - SPH, classical Lagrangian finite element method - FEM and Multi-Material Arbitrary Lagrangian Eulerian - ALE methods are chosen for the modeling and simulation of the orthogonal metal cutting process of AISI H13 in LS-DYNA. The cutting tool is modeled as a rigid FEM body that incrementally penetrates into the flexible deformable workpiece. At each numerical model, the dynamic elastoplastic behavior of the workpiece material is investigated by taking into account the Johnson-Cook (J-C) constitutive strength material model. The influence of the J-C parameter values found in literature to the models is explored. The obtained numerical SPH, FEM and ALE results of the estimated cutting and thrust forces, stress, plastic strain and thermal distributions are compared with results found in the literature. This comparison, leads to valuable conclusions for the performance of the three methods, concerning the approximation accuracy, model development complexity and computational time demands. Based on these conclusions the SPH method is chosen to simulate the experimentally performed orthogonal cut of AISI 1045. The obtained SPH numerical results outline its advantages among the other explicit simulation methods.

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HAMA, Takayuki, Motoo ASAKAWA, Hiroshi FUKIHARU et Akitake MAKINOUCHI. « Investigation of Formability of Hydroformed Automotive Component by Static-Explicit FEM ». Proceedings of The Computational Mechanics Conference 2003.16 (2003) : 591–92. http://dx.doi.org/10.1299/jsmecmd.2003.16.591.

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HWANG, CHAN, SUNG-HAN RHIM, DONG-TEAK CHUNG et SOO-IK OH. « COMPUTATIONAL MODELING OF DYNAMIC BRITTLE FAILURE USING THREE-DIMENSIONAL EXPLICIT FEM ». International Journal of Modern Physics B 22, n^o 09n11 (30 avril 2008) : 1640–46. http://dx.doi.org/10.1142/s0217979208047195.

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Ceramic materials show good mechanical properties. However, the brittleness makes it difficult to predict their dynamic behavior of ceramic materials, and further the discrete nature of brittle failure requires a three-dimensional computation. In this paper, a computational model was developed for analyzing high velocity impact situations of brittle materials, incorporating with node separation scheme to describe the distinctive behavior of a brittle failure. This material behavior model was applied in a three-dimensional explicit code with Lagrangian description, which was developed to compute problems of dynamic brittle failure using four-node tetrahedral elements. To effectively handle the complex contact situations, involving multiple collisions and self-contact of severely deformed and fragmented bodies, careful considerations were paid to the global and local contact searching. In addition, an edge contact algorithm was developed to handle contacts between sharp edges. To validate the developed computational model and three-dimensional explicit code, oblique penetration into sandwiched ceramic plate by long rod was simulated, and the results were compared with experiments.

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Nigro, N., M. Storti et S. Idelsohn. « Fluid flows around turbomachinery using an explicit pseudo-temporal Euler FEM ». Communications in Numerical Methods in Engineering 11, n^o 3 (mars 1995) : 199–211. http://dx.doi.org/10.1002/cnm.1640110303.

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Boukraichi, Hamza, Nassim Razaaly, Nissrine Akkari, Fabien Casenave et David Ryckelynck. « Parametrized non intrusive space-time approximation for explicit dynamic fem applications ». ESAIM : Proceedings and Surveys 73 (2023) : 68–88. http://dx.doi.org/10.1051/proc/202373068.

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In the following work, a benchmark of different non-intrusive model reduction approaches is performed on an explicit dynamic contact 3D-problem. The main purpose of this work is to evaluate the stability of the reduced model with respect to time along with the precision of these approaches with respect to the true solutions of interest. These solutions are the prediction of displacement and velocity fields. The precision of these approaches is also evaluated with respect to the evolution of some materials parameters. Six parameters vary in this study and we would like to predict the whole transient fast dynamic impact response with respect to each parameters. To this end, several models are trained : Proper Orthogonal Decomposition (POD) and Deep convolutional Neural Network (DcNN), in addition, a vectorized version of Interpolation in Grassman Manifolds is proposed. The benchmark performed illustrate that using DcNN’s allows to achieve the best precision and stability in predicting physical fields.

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Almqvist, Andreas. « Fundamentals of Physics-Informed Neural Networks Applied to Solve the Reynolds Boundary Value Problem ». Lubricants 9, n^o 8 (19 août 2021) : 82. http://dx.doi.org/10.3390/lubricants9080082.

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This paper presents a complete derivation and design of a physics-informed neural network (PINN) applicable to solve initial and boundary value problems described by linear ordinary differential equations. The objective with this technical note is not to develop a numerical solution procedure which is more accurate and efficient than standard finite element- or finite difference-based methods, but to give a fully explicit mathematical description of a PINN and to present an application example in the context of hydrodynamic lubrication. It is, however, worth noticing that the PINN developed herein, contrary to FEM and FDM, is a meshless method and that training does not require big data which is typical in machine learning.

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Markovic, Nemanja, Dragoslav Stojic, Radovan Cvetkovic, Vladimir Radojicic et Stefan Conic. « Numerical modeling of ultrasonic wave propagation - by using of explicit FEM in ABAQUS ». Facta universitatis - series : Architecture and Civil Engineering 16, n^o 1 (2018) : 135–47. http://dx.doi.org/10.2298/fuace170830011m.

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Monitoring of structures implies integration of sensors and actuators, smart materials, data transfer as well as computer analyses and simulations with the purpose of damage detection, localization, assessment and prediction of the state of damage at the certain moment and in time. This paper presents the application of the explicit finite element method for modeling of the wave propagation. The examples of concrete plates and thin steel plates in which the propagation of the Lamb waves occur were analyzed. Explicit finite element method was shown to be very efficient even for the waves in ultrasound range. Efficiency, ease of the use and reliability of the wave propagation modeling by the explicit finite element method can contribute to the development of a new and the improvement of the existing methods for the monitoring of structures. The main purpose of this paper is to demonstrate a waveform propagation model using an explicit FEM in ABAQUS software.

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Hu, Hang Jun, Li Min Jin et Bao Zhong Sun. « Finite Element Model Analysis of 3-D Angle-Interlock Woven Composite under Quasi-Static Tensile Loading ». Applied Mechanics and Materials 249-250 (décembre 2012) : 823–27. http://dx.doi.org/10.4028/www.scientific.net/amm.249-250.823.

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The tensile response of three-dimensional angle-interlock woven composite (3DAWC) under quasi-static loading was investigated in experimental and finite element model (FEM) analysis. The FEM analysis was based on micro-structure at yarn level and connected with commercial FEM software ABAQUS/Explicit (ver. 6.10) to calculate the tensile property under quasi-static loading. The experimental and FEM stress-strain results were compared. Good agreement proved that the FEM method based on micro-structure was reasonable and effective and could be used to design 3-D woven structural composite.

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Liu, G. R., S. Y. Duan, Z. M. Zhang et X. Han. « Tubenet : A Special Trumpetnet for Explicit Solutions to Inverse Problems ». International Journal of Computational Methods 18, n^o 01 (3 juillet 2020) : 2050030. http://dx.doi.org/10.1142/s0219876220500309.

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Different types of effective neural network structures have been developed, including the recurrent neural networks (RNNs), concurrent neural networks (CNNs), among others. The TrumpetNet was recently proposed by the leading author for creating two-way deepnets using physics-law-based models, such as finite element method (FEM) and smoothed FEM or S-FEM. The unique feature of the TrumpetNet is the effectiveness of both forward and inverse problems, by design a desired net architecture. Most importantly, solutions to inverse problems can be analytically derived in explicit formulae for the first time. This work presents a novel TubeNet designed for inverse problems, by designing a simple but special tubular architecture. The TubeNet is a simplified TrumpetNet, and hence it is found easier to apply. It uses the principal component analysis (PCA) to reduce the dimensionality of the “measurement” data, which allows one to select the desired number of major principal components to match with the number of neurons in a layer in the TubeNet. Intensive studies and analyses were conducted to examine the proposed TubeNet, using solid mechanics problem considering material property as parameters to be inversely identified. In this work, we successfully inversely identified up to eight parameters for idealized composite laminates, through explicit formulas, termed as direct-weights-inversion (DWI) approach, which is a chain of matrix inversions for the weight matrices of the network layers. The proposed TubeNet concept can fundamentally change the way in which inverse problems in various fields of studies are dealt with. It is a breakthrough in dealing with inverse problem that are inherently difficult to solve.

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Tahmasebinia, Faham, Adam Yang, Patrick Feghali et Krzysztof Skrzypkowski. « Structural Evaluation of Cable Bolts under Static Loading ». Applied Sciences 13, n^o 3 (19 janvier 2023) : 1326. http://dx.doi.org/10.3390/app13031326.

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Rock bursts are a natural phenomenon that are caused by high stresses and faults within the deep geological profile. The framework within deep mining excavations, comprising various rock and face supports such as cable bolts, is required to withstand rock bursts. These mechanisms are subject to static and dynamic loading conditions which possess unique challenges. This study focused on the shearing impact of static loads on cable bolts, a key structural support mechanism designed to absorb energy and investigate the impacts of bolt diameter and strength. A double shear test was modelled using the Finite Element Analysis (FEA) software ABAQUS/Explicit. A double shear test was modelled using Finite Element Modelling (FEM) by creating individual parts, assigning material and contact properties and applying a load directly on the central block. Because ABAQUS/Explicit was used, a primarily dynamic analysis tool, quasi-static loading, was applied to negate the natural time scale. A total of six bolt diameters and six bolt strengths were tested. A positive correlation was exhibited between the bolt diameter, yield strength and the maximum force and displacement.

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Manas, Pavel, Radek Vrana, Zdenek Hejmal et Branislav Dubec. « Determination of the Material Properties of Recycled Rubber for Explicit FEM Simulation ». Key Engineering Materials 755 (septembre 2017) : 1–7. http://dx.doi.org/10.4028/www.scientific.net/kem.755.1.

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Recycled rubber materials are one of cheap and suitable materials for energy absorbers in protective structures. Standard tests of elastomers in uniaxial or biaxial tension is not suitable and efficient for energy absorbers made of recycled car tires. Simple compression test and simple impact test are described material properties from those tests are determined and compared with simulation in ANSYS/AUTODYN.

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Huang, Lihua, Bin Li et Yuefang Wang. « FEM and EFG Quasi-Static Explicit Buckling Analysis for Thin-Walled Members ». Open Journal of Civil Engineering 07, n^o 03 (2017) : 432–52. http://dx.doi.org/10.4236/ojce.2017.73030.

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Chung, W. J., J. W. Cho et T. Belytschko. « On the dynamic effects of explicit FEM in sheet metal forming analysis ». Engineering Computations 15, n^o 6 (septembre 1998) : 750–76. http://dx.doi.org/10.1108/02644409810231880.

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KOBAYASHI, Seiichi, et Kazuyuki SHIZAWA. « FEM Simulation of Craze Evolution for Ductile Polymer by Dynamic Explicit Method ». Proceedings of the JSME annual meeting 2004.1 (2004) : 335–36. http://dx.doi.org/10.1299/jsmemecjo.2004.1.0_335.

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Yang, C. C., Y. F. Su, Steven Y. Liang et K. N. Chiang. « Simulation of Wire Bonding Process Using Explicit Fem with Ale Remeshing Technology ». Journal of Mechanics 36, n^o 1 (2 décembre 2019) : 47–54. http://dx.doi.org/10.1017/jmech.2019.25.

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ABSTRACTThermosonic wire bonding is a common fabrication process for connecting devices in electronic packaging. However, when the free air ball (FAB) is compressed onto the I/O pad of the chip during bonding procedure, chip cracking may occur if the contact pressure is too large. This study proposes an effective simulation technique that can predict the wire ball geometry after bonding in an accurate range. The contact force obtained in the simulation can be used for possible die cracking behavior evaluation. The simulation in this study used the explicit time integration scheme to deal with the time marching problem, and the second-order precision arbitrary Lagrangian-Eulerian (ALE) algorithm was used to deal with the large deformation of the wire ball during the bonding process. In addition, the equilibrium smoothing algorithm in LS-DYNA can make the contact behavior and geometry of the bonding wire almost the same as the experiment, which can also significantly reduce the distortion of the mesh geometry after remeshing.

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IKUSHIMA, Kazuki, Takashi OKADA et Masakazu SHIBAHARA. « OS0402 Residual Stress Analysis of Multi-pass Welding Using Idealized Explicit FEM ». Proceedings of the Materials and Mechanics Conference 2011 (2011) : _OS0402–1_—_OS0402–3_. http://dx.doi.org/10.1299/jsmemm.2011._os0402-1_.

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OKADA, Kenji, Nguyen Ngoc TAM, Yasutomo UETSUJI, Hiroyuki KURAMAE et Eiji NAKAMACHI. « 1219 A Sheet Forming Multiscale Analysis using Dynamic Explicit Crystalplasticity Homogenization FEM ». Proceedings of The Computational Mechanics Conference 2005.18 (2005) : 283–84. http://dx.doi.org/10.1299/jsmecmd.2005.18.283.

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Hai-ming, Zhang, Dong Xiang-huai et Li Zhi-gang. « Study on contact algorithm of dynamic explicit FEM for sheet forming simulation ». Wuhan University Journal of Natural Sciences 6, n^o 3 (décembre 2001) : 704–8. http://dx.doi.org/10.1007/bf02830288.

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Dubois, Céline, Steven Le Corre, Malek Zarroug, Patrick Rozycki et Nicolas Moës. « Impact on highly compressible media in explicit dynamics using the X-FEM ». Computational Mechanics 46, n^o 2 (9 mai 2010) : 329–48. http://dx.doi.org/10.1007/s00466-010-0497-x.

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Hama, Takayuki, Motoo Asakawa, Sadakatsu Fuchizawa et Akitake Makinouchi. « Analysis of Hydrostatic Tube Bulging with Cylindrical Die Using Static Explicit FEM ». MATERIALS TRANSACTIONS 44, n^o 5 (2003) : 940–45. http://dx.doi.org/10.2320/matertrans.44.940.

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Menouillard, T., J. Réthoré, A. Combescure et H. Bung. « Efficient explicit time stepping for the eXtended Finite Element Method (X-FEM) ». International Journal for Numerical Methods in Engineering 68, n^o 9 (27 avril 2006) : 911–39. http://dx.doi.org/10.1002/nme.1718.

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Menouillard, T., J. Réthoré, N. Moës, A. Combescure et H. Bung. « Mass lumping strategies for X-FEM explicit dynamics : Application to crack propagation ». International Journal for Numerical Methods in Engineering 74, n^o 3 (10 septembre 2007) : 447–74. http://dx.doi.org/10.1002/nme.2180.

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Ma, Ninshu, et Shijian Yuan. « An Accelerated Explicit Method and GPU Parallel Computing for Thermal Stress and Welding Deformation of Automotive Parts ». International Journal of Applied Mechanics 08, n^o 02 (mars 2016) : 1650023. http://dx.doi.org/10.1142/s175882511650023x.

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An accelerated explicit method and GPU parallel computing program of finite element method (FEM) are developed for simulating transient thermal stress and welding deformation in large scale models. In the accelerated explicit method, a two-stage computation scheme is employed. The first computation stage is based on a dynamic explicit method considering the characteristics of the welding mechanical process by controlling both the temperature increment and time scaling parameter. In the second computation stage, a static equilibrium computation scheme is implemented after thermal loading to obtain a static solution of transient thermal stress and welding deformation. It has been demonstrated that the developed GPU parallel computing program has a good scalability for large scale models of more than 20 million degrees of freedom (DOFs). The validity of the accelerated explicit method is verified by comparing the transient thermal deformation and residual stresses with those computed by the implicit FEM and experimental measurements. Finally, the thermal stress and strain in an automotive engine cradle model with more than 12 million DOFs were efficiently computed and the results are discussed.

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