bluuebunny/crossref_metadata_2025_split huggingface dataset:
Application of a revised cable theory to Rain‐Wind‐induced vibrations
Authors: Gilow T. , Heinen A.H. 
Published: March 2010

AbstractSimultaneous occurrence of rain and wind can lead to vibrations with large amplitudes of inclined cables and hangers of arch bridges. These motion‐induced vibrations are usually described with models based on the strip theory, or on the cable theory which is the best developed model [1]. The own solution concept derives complete nonlinear cable equations being mechanical equal to those known in literature but with a significant more simple structure by using longitudinal Green's strains and non‐physical cable forces. The nonlinear effects of wind and rain forces are included.As an example of application a cable of the Erasmus bridge in Rotterdam (NL) will be analyzed. The own results are compared with the vibration amplitudes in the literature and with observations. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Plane constrained uniaxial extension of a single crystal strip
Authors: Chau Le Khanh , Sembiring Pramio 
Published: March 2010

AbstractWithin continuum dislocation theory the plane constrained uniaxial extension of a single crystal strip deforming in single or double slip is analyzed. For the single and symmetric double slip, the closed‐form analytical solutions are found which exhibits the energetic and dissipative thresholds for dislocation nucleation, the Bauschinger translational work hardening, and the size effect. Numerical solutions for the non‐symmetric double slip are obtained by finite element procedures. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Micromechanically motivated finite element model for ferroelectric ceramics
Authors: K. Jayabal , Menzel A. , Arockiarajan A. , M.S. Srinivasan 
Published: March 2010

AbstractFerroelectric ceramics exhibit significant coupled electromechanical phenomena that have been widely employed in sensor and actuator applications. In regular finite element models dealing with electromechanical plane problems, each grain needs to be subdiscretized by many triangular or quadrilateral elements for required accuracy. This problem can be overcome by a polygonal finite element approach where each grain is modelled by a single finite element without compromising on the results. In this paper, a polygonal finite element approach has been employed to understand the anisotropic response of the ferroelectric ceramics in their piezoelectric region. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Formulation and application of models for anisotropic hardening in sheet metals subject to complex loading‐path changes
Authors: Clausmeyer Till , Noman Muhammad , Svendsen Bob 
Published: March 2010

AbstractIn this work material models for the simulation of forming processes involving non‐uniform loading path changes are investigated. Materials exhibiting an evolution of the yield surface due to the formation and interaction of dislocation structures on the micro structural level are modeled by employing evolving structural tensors. These account for the evolution of anisotropy and hardening behavior known from technical alloys on a phenomenological basis. In a first step material parameters are identified from experiments for non‐uniform loading conditions. In a second step, the evolution of structural tensors for varying loading conditions is investigated and related to the evolution of kinematic quantities. Finally applications relevant to the simulation of sheet metal forming processes are presented. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Analysis of deformation‐induced twinning at finite strains based on energy minimization
Authors: Homayonifar M. , Steglich D. , Mosler J. 
Published: March 2010

AbstractIn the present contribution, an energy‐based description of phase transformation suitable for the modeling of crystal reorientation during twinning is proposed. A homogenized relaxed stored energy (volume averaging) is utilized for the simulation of the pre‐ and post‐twinning hardening form of magnesium single crystal. The proposed energy‐driven model is applied to analyze the activity of deformation systems inside the twinning related phases. It is shown that the activity of the inter‐twin dislocation systems accommodates the plastic strain at larger deformation. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On a Sharp Interface Model for Phase Transitions in Steel
Authors: Petzold Thomas 
Published: March 2010

AbstractSteel is one of the most widely used materials in the world with a broad spectrum of properties. The microstructure and the distribution of the different phases are of great importance, since they each possess different properties. A sharp interface model for the austenite‐ferrite phase transition is presented. Mechanical effects due to eigenstrains resulting from the different densities of the phases are taken into account. The governing PDEs in each phase are a diffusion equation for the carbon concentration and the balance of momentum. Across the free interface, separating the two phases, the physical quantities may have discontinuities, which are controlled by jump conditions. Consistency of the model with the 2nd law of thermodynamics is shown. Numerical simulations for these types of free boundary problems are quite complex and involve appropriate methods to determine the interface position. One possibility to circumvent the explicit determination of the free boundary is the use of regularization techniques in form of phase field methods, where the interface is tracked implicitly. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical simulation of shear band formation in hyperelastic material by energy relaxation
Authors: Trinh Bach Tuyet , Hackl Klaus 
Published: March 2010

AbstractA theorical framework for the analysis of localized failure in hyperealstic material is presented based on the energy minimization principles associated with micro‐structure developments. The theory is predicated upon the assumptions that the thickness of shear band represented by its volume fraction tends to zero as well as that the energy inside shear band is a function of the norm of the deformation gradient. Shear bands are treated as laminates of first order. The existence of shear bands in the structure leads to an ill‐posed problem which can be solved by means of energy relaxation. An application of the proposed formulation to Neo‐Hookean material is presented. Numerical simulation is shown in order to evaluate the performance of the proposed energy relaxation. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Numerical simulations of poly‐crystalline shape‐memory alloys based on a micromechanical model
Authors: Junker Philipp , Hackl Klaus 
Published: March 2010

AbstractBased on a micormechanical model we describe the material behaviour of specimens made of shape memory alloys by a finite element implementation. These materials undergo solid to solid phase transformations during loading and unloading which determine the characteristic pseudo‐elastic or pseudo‐plastic material response. Phase transitions, orientation distribution (pole figures) and the influence of pre‐texture on the specimen, due to some previous treatment like rolling, are discussed. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Influence of the nonlinear matrix material behaviour on the effective properties of textile‐reinforced thermoplastics
Authors: Kästner Markus , Obst Martin , Brummund Jörg , Ulbricht Volker 
Published: March 2010

AbstractFor a consistent lightweight design the consideration of the nonlinear macroscopic material behaviour of composites, which is amongst others driven by damage and strain‐rate effects on the mesoscale, is required. Therefore, a modelling approach using numerical homogenization techniques is applied to predict the effective nonlinear material behaviour of the composite based on the finite element simulation of a representative volume element (RVE). In this RVE suitable constitutive relations account for the material behaviour of each constituents. While the reinforcing glass fibres are assumed to remain linear elastic, a viscoplastic constitutive law is applied to represent the strain‐rate dependent, inelastic deformation of the matrix material. In order to analyse the influence of the nonlinear matrix material behaviour on the global mechanical response of the composite, effective stress‐strain‐curves are computed for different load cases and compared to experimental observations. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Cellular rubber: Dependency between relaxation time and pretreatment
Authors: Koprowski Nadine , Diebels Stefan , Johlitz Michael 
Published: March 2010

AbstractIn this contribution we investigate experimentally a porous carbon‐filled rubber. The main focus is on the dependency of the mechanical behaviour using different pretreatments. Therfore, cyclic tests and relaxation tests with different pretreatment are performed. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Elastic shallow shells with functionally graded structure
Authors: Jędrysiak Jarosław , Woźniak Czesław 
Published: March 2010

AbstractMain objects of considerations are linear‐elastic thin shallow shells with a tolerance‐periodic structure along one direction. Moreover, their properties along the perpendicular direction can be described by continuous, slowly‐varying functions. Hence, these objects can be treated as shells with a functionally graded structure. Here, the tolerance model of these shells is proposed. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Some problems of heat conduction in transversally graded composites
Authors: Radzikowska Alina , Jędrysiak Jarosław 
Published: March 2010

AbstractThe object of considerations is a two‐component layer made of conductors non‐periodically distributed in the form of laminas along the layer thickness. It is assumed that the distribution of the macroscopic properties of this laminate is approximated by continuous slowly‐varying functions across laminas. Media of this kind can be treated as made of a functionally graded material. The aim of the paper is to apply the tolerance model, [8], to analyse one‐directional, non‐stationary heat conduction along the axis perpendicular to laminas. Moreover, received results are compared to the solutions obtained in the framework of the higher‐order theory, [1]. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Higher‐order energy‐momentum consistent time‐stepping schemes for dynamic finite thermo‐viscoelasticity
Authors: Groß Michael , Betsch Peter 
Published: March 2010

AbstractThis paper is concerned with the energy consistent simulation of a finite thermo‐viscoelastic continuum body. The algorithm is based on a four‐field formulation in the Lagrangian description, in which the deformation field, the velocity field, the temperature field and a strain‐like viscous internal variable field are independent unknowns. The Lagrangian temperature field is determined by the entropy evolution equation associated with Fourier's law of isotropic heat conduction. The viscous evolution equation is derived from a nonlinear internal dissipation. The coupled nonlinear differential equations are discretised by a new space‐time finite element method, consisting of continuous as well as discontinuous finite element approximations in time. Owing to particular time approximations in the constitutive laws, the energy and momentum balances are exactly fulfilled in the fully discrete case. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Calculation of Flexibility of Vibrating Beam as the Subsystem of Mechatronic System by Means the Exact and Approximate Methods
Authors: Buchacz A. 
Published: March 2010

AbstractThe main aim of this paper is to investigate the transients of characteristics of vibrating beams obtained by the exact and approximate methods and to answer to the question – if the method can be used to nominate the characteristics of mechatronic systems. The approach was to nominate the relevance or irrelevance between the characteristics obtained by considered methods – especially concerning the relevance of the natural frequencies‐poles of characteristics of mechanical part of mechatronic system. The main subject of the research is the continuous vibrating beam. Findings of this approach is fact, that approximate solutions fulfill all conditions for vibrating beams and some conditions only, particularly for vibrating beams as the subsystems of mechatronic systems. Practical implications of this paper is the main point is the analysis and the examination of flexibly vibrating discrete‐continuous mechatronic systems which characteristics can be nominated with approximate methods only. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Coupled Process‐Structure‐Model to Simulate Robot Based In‐cremental Sheet Metal Forming
Authors: Bertsch Christine , Laurischkat Roman , Reese Stefanie , Meier Horst 
Published: March 2010

AbstractA coupled process‐structure model to predict path deviations in robot based sheet metal forming is presented. The model consists of a finite element (FE) approach to simulate the sheet forming and a multibody system (MBS) modelling the robot. By coupling both models a path prediction tool is provided. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A two‐phase Finite Element model for coupled heat flux and water flow in fully saturated soils
Authors: Zhou Mengmeng , Nagel Felix , Kruschwitz Jens , Meschke Günther 
Published: March 2010

AbstractThis paper is concerned with the implementation of a macroscopic model for coupled heat flux and water flow in fully saturated soils consisting of a rigid solid skeleton and a compressible fluid phase. In both phases, the same temperature is assumed and phase change of the water phase is neglected. Within the framework of the Theory of Porous Media (TPM), a two‐phase finite element model is developed for the description of fully saturated soils, based upon the governing balance equations (mass balance of the fluid phase and energy balance of the mixture) and constitutive relations (water density, Darcy velocity, free Helmholtz energy functions, heat flux vector and supply term of momentum). The applicability of the model is shown by selected results from the simulation of artificial ground freezing during tunnel construction. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modelling of multilayer transducer by means of the graph and structural numbers method
Authors: Buchacz A. , Wróbel A. 
Published: March 2010

AbstractThis paper presents the characteristics of piezoelectric plate vibration. Model of simple system were shown. The equations of piezoelectric plate have been derived in terms of longitudinal displacement and electric potential. Three ports system for investigated model was determined. Analysis was done by means the graph and structural numbers method. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Analytical inversion of the Jacobian for a class of generalized standard materials
Authors: Fritzen Felix , Böhlke Thomas 
Published: March 2010

AbstractIn this paper we derive an analytical expression for the inverse of the Jacobian occuring in the implicit time integration procedure for a large class of generalized standard materials. The resulting expression is easy to construct and implement into arbitrary programming languages. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Comparison of analytical and numerical methods for homogenization of nanotube‐reinforced polymers
Authors: Schmidt Ina 
Published: March 2010

AbstractCarbon nanotubes are increasingly getting impact as reinforcing material for polymer based nanocomposites. Hence, new modeling strategies are necessary to calculate the behavior of these materials. In the last years some attempts have been made using and developing classical micromechanical models. On the other hand numerical homogenization methods are available to tackle this problem. Examples for both types of modeling strategies are presented with focus on the nanotube geometry. The nanotubes are modeled as hollow tubes as well as as isotropic and transversely isotropic cylinders. As expected the results of numerical and analytical methods are identical for isotropic cylinder inclusions. Small deviations occur for transversely isotropic cylinders in transverse direction. In the case of hollow tube inclusions, the analytical models lead to lower stiffness values in transverse direction and for shear. The largest deviations occur for longitudinal shear with magnitudes smaller than 10%. In contrast the effort to get numerical results is enormous, so that the analytical models are still useful. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Shakedown and limit analysis of periodic composites
Authors: Chen M. , Zhang LL. , Weichert D. , Tang WC. 
Published: March 2010

AbstractThe optimization of fiber distribution is analyzed in order to improve the strength performance of metal‐matrix composite material, which is submitted to two variable independent loads by coupling homogenization and shakedown theories. Numerical Direct Methods are applied to acquire the shakedown domain of three‐dimensional heterogeneous elastic‐perfectly plastic fiber‐reinforced composite for optimal design. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
A Contact Homogenization Framework for Granular Interfaces
Authors: Temizer İlker , Wriggers Peter 
Published: March 2010

AbstractA computational contact homogenization framework is developed for contact interfaces with dry granular third bodies. The micro‐to‐macro transition procedure that forms the basis of this framework consists of projecting the macroscale contact pressure and slip velocity to the observable test surface of a representative contact element. The solution of the local microscale problem reveals a macroscale friction coefficient where inelastic effects are taken into account in a finite deformation setting. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Modeling and simulation of the microstructural behaviour in thermal sprayed coatings
Authors: Klusemann Benjamin , Hortig Christian , Svendsen Bob 
Published: March 2010

AbstractThe purpose of the current work is the investigation of the mechanical behavior of thermal sprayed coatings to predict the influence of the application of compaction on the coatings. Due to the porosity and the poor surface quality of thermal sprayed coatings, an additional process step is necessary to compact the coating and to increase the surface quality, though leading to a complex deformation behavior of the coating. In a first step the microstructural evolution is investigated. Due to the fact that the experimental determination of the mechanical properties of a coating is quite complicated and cost‐intensive, a general procedure is developed which generates the desired quantities for different coating composites from microstructural images which are compared to analytical mean‐field homogenization solutions for elastic material behavior. The discussed thermal sprayed coatings are multiphase systems consisting of a metal‐matrix composite with pores. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Mechanically homogenized material model for a pack of sheets
Authors: Vorhauer Larissa G. , Gerstmayr Johannes 
Published: March 2010

AbstractIn the present contribution we discuss the modeling of a large number of plane metal sheets under compressive forces. The direct approach to this contact problem is based on a finite element (FE) discretization of each sheet and a contact formulation between each adjacent sheet. The numerical problem is highly non‐linear and of very large dimension. Therefore it is difficult to be solved by conventional FE‐software. We propose to replace the contact model by a homogenized constitutive law, which behaves as a pack of infinitely thin sheets. A coarser discretization as for the contact model can be used. A pack of sheets under pressure normal to the sheet plane serves as a benchmark example. The model is verified and implemented for the 2D case and numerical results of the test case are shown. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Incremental self‐consistent approach for the estimation of nonlinear material behavior of metal matrix composites
Authors: Jöchen Katja , Böhlke Thomas 
Published: March 2010

AbstractThe application of homogenization methods to compute the macroscopic material response of metal matrix composites is a possibility to save memory and computation time in comparison to full field simulations. This paper deals with a method to extend the self‐consistent scheme from linear elasticity theory to nonlinear problems. The idea is to approximate the nonlinear problem by an incrementally linear one. Since time discretization of the deformation process implies a certain linearization, we use the algorithmic consistent tangent operator of the composite for defining the linear comparison material in each time step. This is in contrast to classical incremental self‐consistent approaches which use continuum tangent or secant operators. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
On bridging domain methods to couple particle‐ and finite‐element‐based simulations
Authors: Pfaller Sebastian , Steinmann Paul 
Published: March 2010

AbstractThis contribution investigates schemes to couple domains of different resolutions in space, a problem frequently arising in multi‐scale modelling of materials. To couple a standard finite element domain with a high resolution atomistic or molecular, i.e. particle‐based domain, a so‐called bridging domain is considered, e.g. Xu and Belytschko [1], Zhang, Khare, Lu and Belytschko [2] and Bauman et al. [3]. The main goal is to separate the computation of finite element and atomistic domains as much as possible, amongst others, to calculate the different domains on several CPUs. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Multiphase Jet Flow in Abrasive Water Jet Cutting
Authors: Kubik Anna , Kleiser Leonhard 
Published: March 2010

AbstractA numerical model for ultra‐high velocity abrasive water jets (AWJ) is developed and jet dynamic characteristics are calculated under steady‐state, turbulent, compressible, multi‐phase flow conditions. The model is tested by comparison with analytical solutions for related theoretical problems, generally with very good agreement. Simulations of more realistic flows produce the expected values and behavior. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
Stability of a thin liquid layer, spreading on a quasi–rotating disk
Authors: Boettcher Konrad , Ehrhard Peter 
Published: March 2010

AbstractIn many industrial processes solids are coated to obtain specific surface properties, as e.g. corrosion resistance, mechanical (wear) resistance, optical, or electrical properties. Even today many coating processes are not fully understood and the choice of parameters is largely based on experience. Hence, a prediction of the complete hydrodynamic process and the appearance of instabilities in its dependency on the parameters appears highly desirable. This would serve to optimize the quality of the coating. A common coating technique is the so‐called spin coating. The coating agent is dissolved or suspended in a liquid, brought onto the solid, spread by rotation, and the carrier liquid is finally removed by evaporation or by chemical reactions. In this article an evolution equation is derived from lubrication theory, valid for thin liquid layers. The model involves a dynamic contact angle, centrifugal, capillary, and gravitational forces. The evolution equation can be solved analytically, provided the capillary number is small. Then a coupled linear stability analysis of the contact line and the free interface is performed. (© 2009 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)