Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 29 for “"Constitutive modelling"”.
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MACHINE LEARNING FOR CONSTITUTIVE MODELLING
… cost. These surrogate models provide the constitutive law of the micro scale simulations after a training process, called off-line learning. For history dependent materials, the recurrent neural network (RNN) is adopted for the training of path dependent mechanical responses, due to its …
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Numerical Constitutive Modelling for Continuum Mechanics Simulation
… dissertation, on the common theme of obtaining constitutive laws describing bulk properties of crystalline materials. We use ‘first-principles’ techniques where possible, an approach offering results which are predictive, with applicability to a wide class of materials, and with a systematic way …
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Constitutive modelling and finite element analysis in geomechanics
… in this thesis was the development of a constitutive model for hard rock at high pressure. The model should capture the important features of material behaviour and should be soundly based on mechanical principles; furthermore it should be simple enough to permit implementation and use in …
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Constitutive modelling of the skin accounting for chronological ageing
… air pollution and cigarette smoking. Skin modelling is an area of biomechanics that, although medical in nature, has expanded into areas such as cosmetics, military, sports equipment and computer graphics. Skin can be approximated at the macroscopic continuum scale as an anisotropic, …
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Constitutive Modelling of Shear Localisation in Saturated Dilative Sand
… in dilatant hardening materials. Then constitutive relations are upgraded to provide mesh-independent results for different drainage conditions. First, the ability of critical state Nor-Sand model to simulate drained and undrained deformation of dense sand is evaluated. Then non-coaxial …
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Towards mechanism-based constitutive modelling of L1₂ crystal plasticity
A single-crystal plasticity model of the L12 structure intermetallic compound Ni3Al is developed, in light of recent theoretical developments and experimental evidence. Computational results show that the model is capable of predicting the major anomalous mechanical behaviors of L12 structures, …
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Constitutive modelling of branched polymer melts in non-linear response
This thesis is concerned with modelling long chain branched polymer melts using the McLeish and Larson Pompom constitutive equations. Usually the non-linear terms in this model are fitted to uniaxial extensional data due its sensitivity to levels of branching, but in this thesis I will study a …
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On the two-potential constitutive modelling of rubber viscoelastic materials
U of I Only Restriction Lifted for Item 93166 on 2018-07-08T09:15:36Z.
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Constitutive modelling of the behaviour of clays under cyclic loading
… research work involved the implementation of a constitutive model based on plasticity theory to model the behaviour of a clay under cyclic loading. The modelling must be based on an understanding of the soil response and the critical state theory provides a description of the soil response which …
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Testing and constitutive modelling of saturated interfaces in dynamic soil-structure interaction.
… conditions and a constant normal stress. Also, a constitutive model for the stress-strain-pore-pressure behavior of cohesive soil interfaces under dynamic loading is developed using the new unified disturbed state concept (DSC). The model is based on elasto-plasticity theory as defined by the …
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A damage mechanics approach to the three dimensional constitutive modelling of ice deformation
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Ocean Engineering, 1989.
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MECHANICAL CHARACTERISATION AND CONSTITUTIVE MODELLING OF SOFT TISSUES AND BIORESORBABLE POLYMERS FOR BIOMEDICAL APPLICATIONS
L'abstract è presente nell'allegato / the abstract is in the attachment
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Constitutive modelling of the strain hardening behaviour of metastable AISI 301LN austenitic stainless steel as a function of strain and temperature
… work concentrated largely on the derivation of constitutive equations of both volume fraction of martensitic transformation and mechanical response of a metastable austenitic stainless steel alloy as a function of applied strain and temperature. The alloy investigated was a lean version of AISI …
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Implicit coupled constitutive relations and an energy-based method for material modelling
The contributions of this thesis are an implicit modelling method for the coupled constitutive relations and an energy-based method for material modelling. The two developed methods utilise implicit models to represent material constitutive relations without the requirement of physical parameters. …
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Modelling of welding with various constitutive models for steel
… is an attempt at the quality analysis of constitutive modelling of welding as a coupled thermo-mechanical or thermo-mechanical-metallurgical problem. Three types of inelastic theories of continua: unified viscoplasticity based on dislocation density theory, unified viscoplasticity based on …
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Numerical modelling of rubber hyperelasticity, parameter identification and finite element implementations
… model rubber hyperelasticity. Accurate numerical modelling of the hyperelastic behaviour of rubber requires a capable constitutive model and experimental data from the material or component of interest. This research focuses on three areas: hyperelastic constitutive modelling with homogeneous …
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Modelling including associated testing of cohesive soil using disturbed state concept
A new constitutive model for predicting the undrained stress-deformation and pore water pressure response of saturated cohesive soils subjected to cyclic loading is developed using the Disturbed State Concept (DSC) is presented in this dissertation. The model takes into account inelastic non-virgin …
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Multiscale modelling of sutures in a high-performing biological protective structure: the turtle shell
… solid mechanics aspects include multiscale modelling, model order reduction, and finite strain constitutive modelling aspects, such as viscoelasticity, hyperelasticity, and anisotropy.
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Finite deformation of particulate geomaterials: frictional and anisotropic Critical State elasto-plasticity
… and numerical implementation of efficient constitutive models for the analysis of particulate media (specifically clays) in structures undergoing geometrically non-linear behaviour. The Mohr-Coulomb and modified Cam-clay constitutive models have both been examined and extended to provide …
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