Search results for "Viscoplasticity"

showing 3 items of 13 documents

Linear and nonlinear fractional hereditary constitutive laws of asphalt mixtures

2016

The aim of this paper is to propose a fractional viscoelastic and viscoplastic model of asphalt mixtures using experimental data of several tests such as creep and creep recovery performed at different temperatures and at different stress levels. From a best fitting procedure it is shown that both the creep one and recovery curve follow a power law model. It is shown that the suitable model for asphalt mixtures is a dashpot and a fractional element arranged in series. The proposed model is also available outside of the linear domain but in this case the parameters of the model depend on the stress level.

Materials scienceasphalt mixtureStrategy and Managementcreep test0211 other engineering and technologies02 engineering and technologyfractional calculusPower lawcreep test.ViscoelasticityDashpot0203 mechanical engineering021105 building & constructionSettore ICAR/04 - Strade Ferrovie Ed AeroportiComposite materialviscoplasticityviscoelasticityCivil and Structural EngineeringBuilding constructionmechanical modelsViscoplasticityMechanicsmechanical modelFractional calculusfractional calculus asphalt mixture viscoelasticity viscoplasticity rheology mechanical models creep testfractional calculuNonlinear system020303 mechanical engineering & transportsCreepAsphaltrheologyTH1-9745
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Mixed mode failure analysis of bonded joints with rate dependent interface models

2006

The recent developments in joining technologies and the increasing use of composites materials in structural design justify the wide interest of structural mechanics researchers in bonded joints. Joints often represent the weakness zone of the structure and appropriate and rigorous mechanical models are required in order to describe deformation, durability and failure. The present work is devoted to the theoretical formulation and numerical implementation of an interface model suitable to simulate the time-dependent behaviour of bonded joints. The interface laws are formulated in the framework of viscoplasticity for generalized standard materials and describe the softening response of the j…

Numerical AnalysisEngineeringViscoplasticitybusiness.industryStructural mechanicsApplied MathematicsConstitutive equationGeneral EngineeringSystem identificationStructural engineeringInverse problemDissipationFinite element methodbusinessJoint (geology)
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Nonstationary flow surface theory for modeling the viscoplastic behaviors of soils

2016

Abstract This paper presents a three-dimensional elastic viscoplastic model that can describe the time-dependent behaviors of soft clays. The constitutive model is formulated based on the nonstationary flow surface theory and incorporates new developments, including (i) an improved definition of the nonstationary flow surface that is capable of capturing the stress–strain behaviors under different loading paths, (ii) a unique stress–strain—viscoplastic-strain-rate equation that is able to explicitly describe the nonstationary flow surface, and (iii) a final stable state concept that identifies the final equilibrium state at the end of creep and stress relaxation, which is also used to simpl…

Thermodynamic equilibriumConstitutive equation0211 other engineering and technologiesconstitutive modeltime softening02 engineering and technology010502 geochemistry & geophysics01 natural sciencesrate dependentPhysics::GeophysicsConsistency (statistics)nonstationary flow surface theoryStress relaxation021101 geological & geomatics engineering0105 earth and related environmental sciencesMathematicsViscoplasticitybusiness.industryComputer Science Applications1707 Computer Vision and Pattern RecognitionStructural engineeringMechanicsViscoplasticityGeotechnical Engineering and Engineering GeologyOedometer testComputer Science ApplicationsFlow (mathematics)Creepfinal stable state conceptbusiness
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