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Showing 1 to 20 of 25 for “"XFEM"”.
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Parametric Sensitivities of XFEM Based Prognosis for Quasi-static Tensile Crack Growth
… behavior. The eXtended Finite Element Method (XFEM) is a relatively recent concept developed for modeling geometric discontinuities and singularities by introducing the addition of new terms to the classical shape functions in order to allow the finite element formulation to remain the same. …
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A formulation to exactly integrate multiple discontinuities in 2D/3D finite elements by means of equivalent polynomials in XFEM analysis
L'abstract è presente nell'allegato / the abstract is in the attachment
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Improved conditioning and accuracy of a two-scale generalized finite element method for fracture mechanics
… Finite Element Method (GFEM or XFEM) in solving problems involving cracks, material interfaces or localized stress concentrations in large, complex, three-dimensional domains has been well established in the recent past. The superior properties of the GFEM/XFEM rely on the use of …
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Fatigue Crack Growth Analysis with Finite Element Methods and a Monte Carlo Simulation
… Finite Element Method with Phantom Nodes (XFEM-PN) was used, allowing crack propagation along a solution dependent path, independent of the mesh. Low SIFs throughout growth resulted in life estimates 20% too large. All finite element analyses were performed in Abaqus 6-13.3. An integrated …
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Experimental study and numerical modelling of woven fabric kenaf fiber composites hybrid adhesively bonded-bolted joints
… various numerical approaches and fully XFEM techniques was adopted to all series as it provides promising results with better physically representation and less computational time. Good agreements between experimental datasets and predicted bearing stress at failure were found in KFRP …
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Study of photovoltaic (PV) module interconnections failure analysis and reliability
… first time, the extended finite element method (XFEM) technique is used to determine the crack initiation temperature, crack location, direction and growth rate in solder joint of PV module interconnection under lamination process. Furthermore, the research used the Developed Morrow Energy …
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Development of a Computational Approach to Assess Hip Fracture and Repair: Considerations of Intersubject and Surgical Alignment Variability
… technique in the extended finite element method (XFEM) to assess hip fracture and develops a computational approach to evaluate fracture repair.</p> <p>Natural and implanted finite element models were used to predict fracture patterns and evaluate bone-implant load share in subjects with varying …
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Developments in Extended Finite Element Methods for Extraction of Strain Energy Release Rates and Computational Nanomechanics for SWCNT Aggregates
… approach, within the extended finite element (XFEM) framework, is proposed to compute Strain Energy Release Rates (SERRs) directly from Irwin's integral. Crack tip enrichment functions in XFEM allow for evaluation of integral quantities in closed form (for some crack configurations studied) and …
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Finite Element Analysis of Defects in Cord-Rubber Composites and Hyperelastic Materials
… Method (FEM) and Extended Finite Element Method (XFEM) are powerful tools for solving the boundary value problems. One of the objectives of this work is to employ XFEM as a defect identification tool for predicting the crack initiation and propagation in composites. Another major objective of this …
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Predicting failure behavior of polymeric and asphalt composites using damage models
… considered. The extended finite element method (XFEM) was employed to model mesh-independent cracking. The finite element model was validated by comparing the results to indirect tensile laboratory testing and referenced direct tensile laboratory data-based results performed on asphalt samples. …
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Developments in the Extended Finite Element Method and Algebraic Multigrid for Solid Mechanics Problems Involving Discontinuities
… complement of the linear system arising from XFEM is used to develop a Hybrid-AMG method such that crack-conforming aggregates are formed. Another alternative approach involves transforming the original linear system into a modified system that is amenable for a direct application of algebraic …
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Machine learning and interactive real-time simulation for training on relevant total hip replacement skills.
… As training data, we used the results from XFEM simulations precomputed over 5000 frames for plastic deformations on tetrahedral meshes with 20406 elements each. We selected XFEM simulation as the physically-based deformation ground-truth given its accuracy and fast convergence to represent …
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Novel Finite Element Techniques to Expedite the Implementation and Computational Time of 3D Structural Models Showcased Through Space Habitat
… using the extended finite element method (XFEM) was designed to model the three-dimensional mechanics of holes and voids. Finally, an innovative approach was proposed to dynamically couple two independent finite element structural models with a common interface within the SOS framework. …
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A novel discrete damage zone model and enhancement of the extended finite element method for fracture mechanics problems
… function in the extended finite element method (XFEM), and (II) a discrete damage zone model for quasi-static and fatigue delamination in composites. The first method improves XFEM when applied to general nonlinear materials when crack tip analytical solutions are not available. For linear …
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Modeling and Simulation of Random Processes and Fields in Civil Engineering and Engineering Mechanics
… using the eXtended Finite Element Method (XFEM) with arbitrarily shaped inclusions. A novel enrichment function, which can model arbitrarily shaped inclusions within the framework of XFEM, is proposed. The internal boundary of an arbitrarily shaped inclusion is first discretized, and a …
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Multiscale analysis of localized, nonlinear, three-dimensional thermo-structural effects
… Generalized or eXtended Finite Element Method (G/XFEM) for analyzing three-dimensional solid, coupled physics problems exhibiting localized heating and thermomechanical effects. The method is based on the GFEM with global–local enrichment functions (GFEMgl), which involves the solution of …
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Three-dimensional numerical analysis of reflective cracks in airfield pavements
… Generalized or eXtended Finite Element Method (G/XFEM) [10, 12, 41, 108, 109, 119, 163] adds flexibility to the FEM while retaining its attractive features. In this study, the computation of the time-dependent energy release rate G (t) along 3-D crack fronts is done by applying the …
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Dynamic Fracture of Adhesively Bonded Composite Structures Using Cohesive Zone Models
… known as the Extended Finite Element Method (XFEM), is implemented here through an eight-noded quadrilateral plane strain element. The method, based on the partition-of-unity, is used to study simple test configuration like the three-point bend problem and a double cantilever beam. …
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Numerical simulation of fluid flow, proppant transport and fracture propagation in hydraulic fractures for unconventional reservoirs.
… using the extended finite element method (XFEM) and cohesive zone model (CZM), which can model the plastic deformations in the ductile rock. The fracture propagation was coupled with the CFD based proppant transport model, to model the fluid flow and proppant transport. The parametric study …
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Developing new multiscale models for the numerical simulation of Pultruded GFRP Structural Elements
… Method (FEM), eXtended Finite Element Method (XFEM), Virtual Crack Closure Technique (VCCT), Cohesive Zone Modelling (CZM), Multiscale Reduced Order Modelling (ROM), and Random Lattice Modelling (RLM). Each method's distinctive features, challenges, and capabilities are discussed in detail. The …
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