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 33 for “"Stress-Strain-Behaviour"”.
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Stress-strain behaviour of granular soils under monotonic and cyclic loading conditions
The stress-strain behaviour of granular soils under monotonic and cyclic loading conditions and small lateral strains was studied in this work. A simple cubic triaxial apparatus (SCTA), originally developed at Leeds University for monotonic stress-strain studies of sand under controlled and small …
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Investigation of UHPC Columns for Stress-Strain Behaviour, Economic and Environmental Feasibility
… Columns, where both Normal Steel Rebars and Prestressing Strands are considered as Steel Reinforcement. An Environmental Feasibility Analysis and an Economical Feasibility Analysis are performed comparing the Environmental and Economic Viability of a Normal Strength Concrete (NSC) Column to a …
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Finite element modelling and experimental measurement of the mechanical properties of Nb3Sn multi-filamentary composite superconducting wires
… properties are strongly dependent on the strain state within the Nb3Sn. The wires can be subjected to high levels of mechanical stress during fabrication and when the magnet is energised. The effect that this stress has on the Nb3Sn strain state is dependent on the stress-strain behaviour …
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Influence of post-cyclic loading on hemic peat
… of this research is to establish the post-cyclic behaviour of peat soil after cyclically loaded and to assess the effect of parameters changes on static and post-cyclic behaviour of peat soil. 200 specimens are tested, and prepared under consolidated undrained triaxial with effective stresses at …
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The bearing capacity and settlement of gravel piles in clay
… Also, it was felt that an understanding of the stress-strain behaviour of the pile was needed to fully appreciate the implications of any design method. However, prior to the submission of the thesis the writer was made aware of work undertaken in Australia (Balaam and Booker 1979) which used …
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Mechanical Properties and Environmental Performance of Calcium Carbide Residue-Based Materials in Soil Stabilisation
… constitutive model was adopted to reproduce the stress-strain behaviour of stabilised soils. The results showed that all CCR-based materials significantly improved soil strength compared to untreated soil, with alkali-activated CCR-FA developing the highest strength and lowest compressibility in …
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Development of a fatigue tester and material model for flexible heart valve applications
… tools address the question of how to model the stress-strain behaviour of polymer networks and thermoplastic polyurethanes in particular, as well as how to practically evaluate the durability of the proposed material. A model for polyurethane stress-strain behaviour is proposed, whereby the …
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Elastic analysis of soil media.
Elastic Solutions can be used to predict stresses and displacements in loaded soil media provided the non-linear stress-strain behaviour of the soil is recognised and allowance made for it in calculating displacements. This thesis examines the methods of elastic analysis suitable for examining …
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Finite element modelling the forming of components for portable electronic devices
… Desire to accurately predict the deformation behaviour throughout the forming process has led to the development of mathematical models representative of material behaviour, with the ultimate aim of embedding these relationships into forming simulations enabling process and product …
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Mechanisms of deformation in beta-brass single crystals
… an extension of an earlier investigation of the stress/strain behaviour of β-brass single crystals under static and dynamic loading. It was aimed at elucidating the mechanisms of deformation, using optical microscopy to examine slip habits and transmission electron microscopy to examine …
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Modellierung der Verfestigung technischer Aluminiumlegierungen
The large strain work hardening behaviour of technical aluminium alloys as function of the deformation temperature and strain rate is described in two ways. First a phenomenological description is made using well known models from literature. For some specific cases the models are expanded. …
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Extraction of Inelastic Mecahnical Properties of Metals from Indentation Data
… demonstrated that it is possible to extract the stress strain behaviour of metals that compare well with the macroscopically measured properties using an instrumented indentation load displacement plot, as long as the penetration ratio, δ/R, is approximately 40 %. The required penetration ratio …
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Machine learning-based stress-strain prediction and process parameter optimisation in material extrusion additive manufacturing
… accurately predicting and controlling the full stress-strain behaviour of the printed parts. A reliable understanding of the stress-strain response is essential not only for assessing the structural safety but also for guiding the design of printing parameters tailored to the …
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The measurement and interpretation of small strain stiffness of soils
The measurement of soil stiffness at very small strains (Gmax) has been carried out under both dynamic and continuous loading in the triaxial apparatus up to high stresses. A new system of LVDTs has been used to measure axial strain locally during continuous loading while dynamic stiffnesses were …
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Analysis of prior strain history effect on mechanical properties and residual stresses in beams
… method for the determination of residual stresses in materials compared to the use of Xray and neutron diffraction methods. The vast majority of the work found for the application of the eeM in the literature concentrated on the determination of residual stresses in annealed beam …
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Studies of the Evaluation of Solid Phase Dispersants in Polymer Blends
… dynamic mechanical properties, morphology and stress-strain behaviour of the blends in the absence and presence of the corresponding SPDs were examined before and after thermal and ultraviolet (UV) irradiation.
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Application of image analysis techniques to determine strain distribution in leather
… to investigate the uni-axial deformation behaviour of leather. This technique provided more information about the stress-strain behaviour of a leather sample along the gauge length than a conventional mechanical test and it was possible to accurately measure the strain distribution along …
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Stress-strain response of soft soils stabilised with alkali activated industrial by-products
… little research has been devoted to the shear behaviour of soft soils stabilised with those type of binders and their numerical modelling using constitutive models. This PhD thesis aims to deepen the knowledge in this area through the characterisation of the short- and long-term shear behaviour …
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CONTINUUM DISLOCATION DYNAMICS MODELING OF THE DEFORMATION OF FCC SINGLE CRYSTALS
… solving the Cauchy¡¯s equilibrium equation for stress. The coupled kinetic equations and crystal mechanics equations are numerically solved in a staggered fashion using a custom finite element approach featuring the use of Galerkin and Least Squares finite element methods for the mechanics and …
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