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A cell-based smoothed finite element method for three dimensional solid structures (2014)
Nguyen-Xuan, Hung ; Nguyen, Hiep Vinh ; Bordas, Stéphane Pierre Alain ; Rabczuk, Timon ; Duflot, Marc
This paper extends further the strain smoothing technique in finite elements to 8-noded hexahedral elements (CS-FEM-H8). The idea behind the present method is similar to the cell-based smoothed 4-noded quadrilateral finite elements (CS-FEM-Q4). In CSFEM, the smoothing domains are created based on elements, and each element can be further subdivided into 1 or several smoothing cells. It is observed that: 1) The CS-FEM using a single smoothing cell can produce higher stress accuracy, but insufficient rank and poor displacement accuracy; 2) The CS-FEM using several smoothing cells has proper rank, good displacement accuracy, but lower stress accuracy, especially for nearly incompressible and bending dominant problems. We therefore propose 1) an extension of strain smoothing to 8-noded hexahedral elements and 2) an alternative CS-FEM form, which associates the single smoothing cell issue with multi-smoothing cell one via a stabilization technique. Several numerical examples are provided to show the reliability and accuracy of the present formulation.
A comparative study of two molecular mechanics models based on harmonic potentials (2013)
Zhao, Jun-Hua ; Wang, L. ; Jiang, Jin-Wu ; Wang, Z. ; Guo, Wanlin ; Rabczuk, Timon
A comparative study of two molecular mechanics models based on harmonic potentials
A comparison of approximate response functions in structural reliability analysis (2008)
Bucher, Christian ; Most, Thomas
A comparison of approximate response functions in structural reliability analysis
A computational library for multiscale modeling of material failure (2014)
Talebi, Hossein ; Silani, Mohammad ; Bordas, Stéphane Pierre Alain ; Kerfriden, Pierre ; Rabczuk, Timon
A computational library for multiscale modeling of material failure
A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage (2014)
Zhuang, Xiaoying ; Huang, Runqiu ; Rabczuk, Timon ; Liang, C.
A coupled thermo-hydro-mechanical model of jointed hard rock for compressed air energy storage
A dynamic XFEM formulation for crack identification (2016)
Zhang, Chao ; Wang, Cuixia ; Lahmer, Tom ; He, Pengfei ; Rabczuk, Timon
A dynamic XFEM formulation for crack identification
A four-node plane EAS-element for stochastic nonlinear materials (2003)
Brehm, Maik ; Most, Thomas
A four-node plane EAS-element for stochastic nonlinear materials
A GENERIC FRAMEWORK SUPPORTING DISTRIBUTED COMPUTING IN ENGINEERING APPLICATIONS (2015)
Wiggenbrock, Jens ; Smarsly, Kay
Modern distributed engineering applications are based on complex systems consisting of various subsystems that are connected through the Internet. Communication and collaboration within an entire system requires reliable and efficient data exchange between the subsystems. Middleware developed within the web evolution during the past years provides reliable and efficient data exchange for web applications, which can be adopted for solving the data exchange problems in distributed engineering applications. This paper presents a generic approach for reliable and efficient data exchange between engineering devices using existing middleware known from web applications. Different existing middleware is examined with respect to the suitability in engineering applications. In this paper, a suitable middleware is shown and a prototype implementation simulating distributed wind farm control is presented and validated using several performance measurements.
A Meshless Adaptive Multiscale Method for Fracture (2015)
Yang, Shih-Wei ; Budarapu, Pattabhi Ramaiah ; Mahapatra, D.R. ; Bordas, Stéphane Pierre Alain ; Zi, Goangseup ; Rabczuk, Timon
A Meshless Adaptive Multiscale Method for Fracture
A moving least squares weighting function for the element-free Galerkin method which almost fulfills essential boundary conditions (2005)
Most, Thomas ; Bucher, Christian
A moving least squares weighting function for the element-free Galerkin method which almost fulfills essential boundary conditions
A multigrid finite element method for the mesoscale analysis of concrete (2004)
Häfner, Stefan ; Könke, Carsten
A multigrid finite element method for the mesoscale analysis of concrete
A natural neighbour-based moving least-squares approach for the element-free Galerkin method (2007)
Most, Thomas
A natural neighbour-based moving least-squares approach for the element-free Galerkin method
A node-based smoothed finite element method (NS-FEM) for analysis of Reissner-Mindlin plates (2010)
Nguyen-Xuan, Hung ; Rabczuk, Timon ; Nguyen-Thanh, Nhon ; Nguyen-Thoi, T. ; Bordas, Stéphane Pierre Alain
A node-based smoothed finite element method (NS-FEM) for analysis of Reissner-Mindlin plates
A NOTE ON THE CLIFFORD FOURIER-STIELTJES TRANSFORM (2012)
Morais, Joao ; Georgiev, Svetlin ; Sprößig, Wolfgang
The purpose of this article is to provide an overview of the real Clifford Fourier- Stieltjes transform (CFST) and of its important properties. Additionally, we introduce the definition of convolution of Clifford functions of bounded variation.
A Novel Dynamic Multilevel Technique for Image Registration (2015)
Jia, Yue ; Zhang, Yongjie ; Rabczuk, Timon
A Novel Dynamic Multilevel Technique for Image Registration
A novel parameter identification approach for buffer elements involving complex coupled thermo-hydro-mechanical analyses (2016)
Nguyen-Tuan, Long ; Lahmer, Tom ; Datcheva, Maria ; Stoimenova, Eugenia ; Schanz, Tom
A novel parameter identification approach for buffer elements involving complex coupled thermo-hydro-mechanical analyses
A partitioned model order reduction approach to rationalise computational expenses in nonlinear fracture mechanics (2013)
Kerfriden, Pierre ; Goury, O. ; Rabczuk, Timon ; Bordas, Stéphane Pierre Alain
A partitioned model order reduction approach to rationalise computational expenses in nonlinear fracture mechanics
A plasticity model for calculating stress–strain sequences under multiaxial nonproportional cyclic loading (2003)
Döring, R. ; Hoffmeyer, J. ; Seeger, T. ; Vormwald, M.
A plasticity model for calculating stress–strain sequences under multiaxial nonproportional cyclic loading
A Semi-Concurrent Multiscale Approach for Modeling Damage in Nanocomposites (2014)
Silani, Mohammad ; Ziaei-Rad, S. ; Talebi, Hossein ; Rabczuk, Timon
A Semi-Concurrent Multiscale Approach for Modeling Damage in Nanocomposites
A semi-implicit _nite strain shell algorithm using in-plane strains based on least-squares (2015)
Areias, Pedro ; Rabczuk, Timon ; Cesar de Sa, J.M. ; Jorge, R.N.
A semi-implicit _nite strain shell algorithm using in-plane strains based on least-squares
A SERVICE ORIENTED ARCHITECTURE FOR BUILDING PERFORMANCE MONITORING (2010)
Stack, Paul ; Manzoor, Farhan ; Menzel, Karsten ; Cahill, Brian
Information technology plays a key role in the everyday operation of buildings and campuses. Many proprietary technologies and methodologies can assist in effective Building Performance Monitoring (BPM) and efficient managing of building resources. The integration of related tools like energy simulator packages, facility, energy and building management systems, and enterprise resource planning systems is of benefit to BPM. However, the complexity to integrating such domain specific systems prevents their common usage. Service Oriented Architecture (SOA) has been deployed successfully in many large multinational companies to create integrated and flexible software systems, but so far this methodology has not been applied broadly to the field of BPM. This paper envisions that SOA provides an effective integration framework for BPM. Service oriented architecture for the ITOBO framework for sustainable and optimised building operation is proposed and an implementation for a building performance monitoring system is introduced.
A Short Crack Growth Model for the Prediction of Fatigue Lives under Multiaxial Nonproportional Loading (2001)
Döring, R. ; Hoffmeyer, J. ; Seeger, T. ; Vormwald, M.
A Short Crack Growth Model for the Prediction of Fatigue Lives under Multiaxial Nonproportional Loading
A simple circular cell method for multilevel finite element analysis (2012)
Talebi, Hossein ; Zi, Goangseup ; Silani, Mohammad ; Samaniego, Esteban ; Rabczuk, Timon
A simple multiscale analysis framework for heterogeneous solids based on a computational homogenization technique is presented. The macroscopic strain is linked kinematically to the boundary displacement of a circular or spherical representative volume which contains the microscopic information of the material. The macroscopic stress is obtained from the energy principle between the macroscopic scale and the microscopic scale. This new method is applied to several standard examples to show its accuracy and consistency of the method proposed.
A SMOOTHED FINITE ELEMENT METHOD FOR THE STATIC AND FREE VIBRATION ANALYSIS OF SHELLS (2010)
Nguyen-Thanh, Nhon ; Rabczuk, Timon
A four-node quadrilateral shell element with smoothed membrane-bending based on Mindlin-Reissner theory is proposed. The element is a combination of a plate bending and membrane element. It is based on mixed interpolation where the bending and membrane stiffness matrices are calculated on the boundaries of the smoothing cells while the shear terms are approximated by independent interpolation functions in natural coordinates. The proposed element is robust, computationally inexpensive and free of locking. Since the integration is done on the element boundaries for the bending and membrane terms, the element is more accurate than the MITC4 element for distorted meshes. This will be demonstrated for several numerical examples.
A smoothed finite element method for the static and free vibration analysis of shells (2010)
Nguyen-Thanh, Nhon ; Thai-Hoang, C. ; Nguyen-Xuan, Hung ; Rabczuk, Timon
A smoothed finite element method for the static and free vibration analysis of shells
A software framework for probabilistic sensitivity analysis for computationally expensive models (2016)
Vu-Bac, N. ; Lahmer, Tom ; Zhuang, Xiaoying ; Nguyen-Thoi, T. ; Rabczuk, Timon
A software framework for probabilistic sensitivity analysis for computationally expensive models
A Stillinger-Weber Potential for Single-Layer Black Phosphorus, and the Importance of Cross-Pucker Interactions for Negative Poisson's Ratio and Edge Stress-Induced Bending (2015)
Jiang, Jin-Wu ; Rabczuk, Timon ; Park, Harold S.
The distinguishing structural feature of single-layered black phosphorus is its puckered structure, which leads to many novel physical properties. In this work, we first present a new parameterization of the Stillinger–Weber potential for single-layered black phosphorus. In doing so, we reveal the importance of a cross-pucker interaction term in capturing its unique mechanical properties, such as a negative Poisson's ratio. In particular, we show that the cross-pucker interaction enables the pucker to act as a re-entrant hinge, which expands in the lateral direction when it is stretched in the longitudinal direction. As a consequence, single-layered black phosphorus has a negative Poisson's ratio in the direction perpendicular to the atomic plane. As an additional demonstration of the impact of the cross-pucker interaction, we show that it is also the key factor that enables capturing the edge stress-induced bending of single-layered black phosphorus that has been reported in ab initio calculations.
A stochastic computational method based on goal-oriented error estimation for heterogeneous geological materials (2016)
Ghorashi, Seyed Shahram ; Lahmer, Tom ; Bagherzadeh, Amir Saboor ; Zi, Goangseup ; Rabczuk, Timon
A stochastic computational method based on goal-oriented error estimation for heterogeneous geological materials
A Surface Stacking Fault Energy Approach to Predicting Defect Nucleation in Surface-Dominated Nanostructures (2013)
Jiang, Jin-Wu ; Park, Harold S. ; Gall, K. ; Leach, A. ; Rabczuk, Timon
A Surface Stacking Fault Energy Approach to Predicting Defect Nucleation in Surface-Dominated Nanostructures
A theoretical analysis of cohesive energy between carbon nanotubes, graphene and substrates (2014)
Zhao, Jun-Hua ; Jiang, Jin-Wu ; Jia, Yue ; Guo, Wanlin ; Rabczuk, Timon
Explicit solutions for the cohesive energy between carbon nanotubes, graphene and substrates are obtained through continuum modeling of the van der Waals interaction between them. The dependence of the cohesive energy on their size, spacing and crossing angles is analyzed. Checking against full atom molecular dynamics calculations and available experimental results shows that the continuum solution has high accuracy. The equilibrium distances between the nanotubes, graphene and substrates with minimum cohesive energy are also provided explicitly. The obtained analytical solution should be of great help for understanding the interaction between the nanostructures and substrates, and designing composites and nanoelectromechanical systems.
A three dimensional Extended Arlequin Method for Dynamic Fracture (2015)
Silani, Mohammad ; Talebi, Hossein ; Ziaei-Rad, S. ; Hamouda, A.M.S. ; Zi, Goangseup ; Rabczuk, Timon
A three dimensional Extended Arlequin Method for Dynamic Fracture
A UNIFIED APPROACH FOR THE TREATMENT OF SOME HIGHER DIMENSIONAL DIRAC TYPE EQUATIONS ON SPHERES (2010)
Cacao, Isabel ; Constales, Denis ; Kraußhar, Rolf Sören
Using Clifford analysis methods, we provide a unified approach to obtain explicit solutions of some partial differential equations combining the n-dimensional Dirac and Euler operators, including generalizations of the classical time-harmonic Maxwell equations. The obtained regular solutions show strong connections between hypergeometric functions and homogeneous polynomials in the kernel of the Dirac operator.
A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs) (2015)
Vu-Bac, N. ; Silani, Mohammad ; Lahmer, Tom ; Zhuang, Xiaoying ; Rabczuk, Timon
A unified framework for stochastic predictions of Young's modulus of clay/epoxy nanocomposites (PCNs)
ABAQUS implementation of phase_field model for brittle fracture (2015)
Msekh, Mohammed Abdulrazzak ; Sargado, M. ; Jamshidian, M. ; Areias, Pedro ; Rabczuk, Timon
ABAQUS implementation of phase_field model for brittle fracture
Acoustic and breathing phonon modes in bilayer graphene with Moire-acute patterns (2012)
Jiang, Jin-Wu ; Wang, Bing-Shen ; Rabczuk, Timon
The lattice dynamics properties are investigated for twisting bilayer graphene. There are big jumps for the inter-layer potential at twisting angle θ=0° and 60°, implying the stability of Bernal-stacking and the instability of AA-stacking structures, while a long platform in [8,55]° indicates the ease of twisting bilayer graphene in this wide angle range. Significant frequency shifts are observed for the z breathing mode around θ=0° and 60°, while the frequency is a constant in a wide range [8,55]°. Using the z breathing mode, a mechanical nanoresonator is proposed to operate on a robust resonant frequency in terahertz range.
ADAPTABLE PROJECT MANAGEMENT PLANS USING CHANGE TEMPLATES-BASED APPROACH (2010)
Sharmak, Wael ; Scherer, Raimar J.
The uncertainty existing in the construction industry is bigger than in other industries. Consequently, most construction projects do not go totally as planned. The project management plan needs therefore to be adapted repeatedly within the project lifecycle to suit the actual project conditions. Generally, the risks of change in the project management plan are difficult to be identified in advance, especially if these risks are caused by unexpected events such as human errors or changes in the client preferences. The knowledge acquired from different resources is essential to identify the probable deviations as well as to find proper solutions to the faced change risks. Hence, it is necessary to have a knowledge base that contains known solutions for the common exceptional cases that may cause changes in each construction domain. The ongoing research work presented in this paper uses the process modeling technique of Event-driven Process Chains to describe different patterns of structure changes in the schedule networks. This results in several so called “change templates”. Under each template different types of change risk/ response pairs can be categorized and stored in a knowledge base. This knowledge base is described as an ontology model populated with reference construction process data. The implementation of the developed approach can be seen as an iterative scheduling cycle that will be repeated within the project lifecycle as new change risks surface. This can help to check the availability of ready solutions in the knowledge base for the situation at hand. Moreover, if the solution is adopted, CPSP, “Change Project Schedule Plan „a prototype developed for the purpose of this research work, will be used to make the needed structure changes of the schedule network automatically based on the change template. What-If scenarios can be implemented using the CPSP prototype in the planning phase to study the effect of specific situations without endangering the success of the project objectives. Hence, better designed and more maintainable project schedules can be achieved.
Adaptation of the natural element method for crack growth simulations (2004)
Unger, Jörg F. ; Most, Thomas ; Bucher, Christian ; Könke, Carsten
Adaptation of the natural element method for crack growth simulations
Adaptive damage simulation of concrete using heterogeneous multiscale models (2008)
Eckardt, Stefan ; Könke, Carsten
Adaptive damage simulation of concrete using heterogeneous multiscale models
ADAPTIVE EIGENVALUE COMPUTATION FOR ELLIPTIC OPERATORS (2010)
Zeiser, Andreas ; Dahmen, W. ; Rohwedder, T. ; Schneider, R.
We present recent developments of adaptive wavelet solvers for elliptic eigenvalue problems. We describe the underlying abstract iteration scheme of the preconditioned perturbed iteration. We apply the iteration to a simple model problem in order to identify the main ideas which a numerical realization of the abstract scheme is based upon. This indicates how these concepts carry over to wavelet discretizations. Finally we present numerical results for the Poisson eigenvalue problem on an L-shaped domain.
Adaptive excitation for selective sensitivity-based structural identification (2006)
Pham, Hoang Anh
Adaptive excitation for selective sensitivity-based structural identification
Adaptive response surface approach for reliability analysis using advanced meta-models (2007)
Most, Thomas ; Bucher, Christian
Adaptive response surface approach for reliability analysis using advanced meta-models
Adaptive response surface approach using artificial neural networks and Moving Least Squares (2006)
Most, Thomas ; Bucher, Christian
Adaptive response surface approach using artificial neural networks and Moving Least Squares
Adaptive Response Surfaces for Structural Reliability of Nonlinear Finite Element Structures (2003)
Roos, Dirk ; Bucher, Christian
Adaptive Response Surfaces for Structural Reliability of Nonlinear Finite Element Structures
Algorithms for structural identification and damage detection of steel-concrete composite bridges (2009)
De Roeck, G. ; Zabel, Volkmar ; Brehm, Maik ; Liu, K. ; Reynders, E.
Algorithms for structural identification and damage detection of steel-concrete composite bridges
Algorithms for vibration-based structural identification and damage detection (2010)
Zabel, Volkmar ; Brehm, Maik
Algorithms for vibration-based structural identification and damage detection
Ambient modal analysis and model updating of a twin composite filler beam railway bridge for high-speed trains with continuous ballast (2008)
Cantieni, Reto ; Brehm, Maik ; Zabel, Volkmar ; Rauert, T. ; Hoffmeister, B.
Ambient modal analysis and model updating of a twin composite filler beam railway bridge for high-speed trains with continuous ballast
Ambient Testing and Model Updating of a Filler Beam Bridge for High-Speed Trains (2008)
Cantieni, Reto ; Brehm, Maik ; Zabel, Volkmar ; Rauert, T. ; Hoffmeister, B.
Ambient Testing and Model Updating of a Filler Beam Bridge for High-Speed Trains
AMELIORATING EMPLOYABILITY IN CONSTRUCTION THROUGH BIM INNOVATION (2015)
Nasir, A.R. ; Bargstädt, Hans-Joachim
Low-skilled labor makes a significant part of the construction sector, performing daily production tasks that do not require specific technical knowledge or confirmed skills. Today, construction market demands increasing skill levels. Many jobs that were once considered to be undertaken by low or un-skilled labor, now demand some kind of formal skills. The jobs that require low skilled labor are continually decreasing due to technological advancement and globalization. Jobs that previously required little or no training now require skilful people to perform the tasks appropriately. The study aims at ameliorating employability of less skilled manpower by finding ways to instruct them for performing constructions tasks. A review of exiting task instruction methodologies in construction and the underlying gaps within them warrants an appropriate way to train and instruct low skilled workers for the tasks in construction. The idea is to ensure the required quality of construction with technological and didactic aids seeming particularly purposeful to prepare potential workers for the tasks in construction without exposing them to existing communication barriers. A BIM based technology is considered promising along with the integration of visual directives/animations to elaborate the construction tasks scheduled to be carried on site.
An adaptive multiscale method for quasi-static crack growth (2014)
Budarapu, Pattabhi Ramaiah ; Gracie, Robert ; Bordas, Stéphane Pierre Alain ; Rabczuk, Timon
This paper proposes an adaptive atomistic- continuum numerical method for quasi-static crack growth. The phantom node method is used to model the crack in the continuum region and a molecular statics model is used near the crack tip. To ensure self-consistency in the bulk, a virtual atom cluster is used to model the material of the coarse scale. The coupling between the coarse scale and fine scale is realized through ghost atoms. The ghost atom positions are interpolated from the coarse scale solution and enforced as boundary conditions on the fine scale. The fine scale region is adaptively enlarged as the crack propagates and the region behind the crack tip is adaptively coarsened. An energy criterion is used to detect the crack tip location. The triangular lattice in the fine scale region corresponds to the lattice structure of the (111) plane of an FCC crystal. The Lennard-Jones potential is used to model the atom–atom interactions. The method is implemented in two dimensions. The results are compared to pure atomistic simulations; they show excellent agreement.
An adaptive response surface approach for reliability analyses of high-dimensional problems (2008)
Most, Thomas
An adaptive response surface approach for reliability analyses of high-dimensional problems
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