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Showing 1 to 20 of 50 for “"Constitutive laws"”.
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Developing Constitutive Laws for the Endothelial Glycocalyx Layer
In this work, we aim to develop new mathematical models for the Endothelial Glycocalyx Layer (EGL) in order to improve our understanding of the layer and its functions, particularly in the microcirculation. The EGL is a porous macromolecular layer that lines the insides of blood vessels. It is …
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ΥΠΟΛΟΓΙΣΜΟΣ ΦΟΡΕΩΝ ΓΙΑ ΠΛΗΡΕΙΣ ΝΟΜΟΥΣ ΤΩΝ ΔΟΜΙΚΩΝ ΤΟΥΣ ΣΤΟΙΧΕΙΩΝ
… BEHAVIOUR ARE STUDIED. THE NOTION OF "COMPLETE" CONSTITUTIVE LAW IN MECHANICS IS FIRST INTRODUCED. THE MATHEMATICAL MODEL OF THE STATIC AND DYNAMIC PROBLEM OF STRUCTURES WITH COMPLETE CONSTITUTIVE LAWS OF THEIR ELEMENTS IS NEXT FORMULATED IN THE FORM OF HEMIVARIATIONAL INEQUALITY AND …
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Finite Element Modeling of Steel Corrosion in Concrete Structures
… chloride-induced corrosion. The program includes constitutive laws, element formulations and global solution schemes to allow the analysis of steady-state (static) and time-dependent (dynamic) problems, involving multiple, coupled processes such as mechanical deformation, heat transfer, mass flow …
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Data-driven Modeling of Lithium Intercalation Materials
… to infer and quantify the uncertainty of the constitutive laws from multiple data streams. Applications include learning the constitutive laws from images of pattern formation, inverting the unknown free energy, reaction kinetics, spatial heterogeneity, and chemo-mechanical coupling from …
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Simulation of delamination in composite materials under static and fatigue loading by cohesive zone models
… The model has been studied with different static constitutive laws and damage definitions, coupled with a particular fatigue degradation strategy. In particular, the sensitivity of the model, with the different proposed constitutive laws, has been evaluated with respect to some its key parameters.
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Physics-based models of hysteresis in multiphase flow in porous media
… that are suitable for use as hysteresis-enabling constitutive laws for capillary pressure and relative permeabilities in conventional continuum simulations of multiphase flow.
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Sand Deformation Mechanisms and Earth Pressures Mobilised with Retaining Wall Movements
… sand shear strains in order to build simplified constitutive laws approximately characterising the earth pressure mobilisation with active and passive wall movements. A novel design method has subsequently been successfully proposed for flexible retaining walls in sand based on the simplified …
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Dislocations and Green's functions in prestressed solids
… Part, while implementation of elastoplastic constitutive laws are treated in the second. These subjects can be seen as different approaches to the investigation of the plastic behaviour of materials. In the first Part, infinite-body two-dimensional Green's functions are derived for the …
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Adaptive finite elements for viscoelastic deformation problems
… depends on their recent past. Viscoelastic constitutive laws for stress typically take the form of a sum of an instantaneous response term and an integral over their past responses. Such laws are called hereditary integral constitutive laws. The main purpose of this study is to analyse …
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Numerical Analysis of a Generalized Plane Plastica
… allowing an accurate approximation to the constitutive laws of actual materials. For elastic-plastic analysis a more specific tri-linear stress-strain relation is assumed, and the material is assumed to harden in a kinematic fashion. Incremental loads are employed, and plastic loading, …
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Experiments and modeling of multilayered coatings and membranes : application to thermal barrier coatings and reverse osmosis membranes
… interface is modeled using traction-separation constitutive laws. Furthermore, a coupled fluid-permeation and large deformation theory is proposed for crosslinked polymers with a view towards application to reverse-osmosis. A systematic simulation plus experiment-based methodology is proposed in …
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Analytical Modeling of the Mechanics of Nucleation and Growth of Cracks
… and rotation. Various mechanical softening constitutive laws thermodynamically consistent with damage mechanics are postulated that relate the interfacial tractions to the displacement jump. An exponential function is used for the constitutive law such that it satisfies a multi-axial stress …
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Time integration algorithms for finite element analysis of creep problems
… The emphasis is on uniaxial creep and simple constitutive laws are adopted. The essential nature of the problem is presented in different formulations. The creep problem is contained in a system of nonlinear first order ordinary differential equations in the creep strains only. This suggests …
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Geometric and Material Nonlinear Analysis of Three-Dimensional Soil-Structure Interaction
… of stress, stress and strain rates, and constitutive laws. The analysis adopts the original Newton-Raphson technique coupled with incremental approach. Different elasto-plastic laws based on Von-Mises, Drucker-Prager, critical state, and cap criteria are incorporated in the formulation …
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A Softened Membrane Model for UHPC (SMM-UHPC)
… the biaxial behavior of UHPC was derived and new constitutive laws were integrated into SMM. It was also found that the decomposition between biaxial and uniaxial strain fields, commonly used in SMM, may be of less significance for UHPC. Comparisons with shear panel tests were used to evaluate the …
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AN EQUIVALENT NON-UNIFORM INELASTIC BEAM-LIKE MODEL FOR THE SEISMIC VULNERABILITY ASSESSMENT OF BUILDINGS
… model characterised by linear or non-linear constitutive laws. Numerical results of two benchmark buildings show the comparisons with the results provided by beam-like and FEM models and confirm the ability of the proposed model to reproduce both the linear and non-linear responses of …
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Advanced control of MEMS probing devices
… choice of variables even when the the underlying constitutive laws are nonlinear. Controllers are developed based on PID and H∞ control design methodologies. Control algorithms from PID control and robust control have been implemented on dSpace digital processing platform. The implemented control …
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Development of a finite element method for light activated polymers
… photo-mechanical theory is summarized and some constitutive laws that govern LASMPS are described. Implementation of the multiphysics governing equations takes the form of a user defined element subroutine within the commercial software package ABAQUS/STANDARD. Simulations are carried out with …
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A Proper Orthogonal Decomposition-based inverse material parameter optimization method with applications to cardiac mechanics
… is dependent on the formulation of appropriate constitutive laws and accurate identification of their material parameters. The main focus of this contribution is to investigate a Proper Orthogonal Decomposition with Interpolation (PODI) based method for inverse material parameter optimization in …
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