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 71 for “"Deformation Behaviour"”.
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Deformation behaviour of bitumen and bituminous mixes
… models for the transient monotonic and cyclic deformation behaviour of bitumen and asphalt mixes. The first part of this dissertation is concerned with an experimental and theoretical investigation of the deformation behaviour of bitumen. The second part is concerned with the deformation of …
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Deformation Behaviour of NiCo Multilayers with Modulated Microstructures
… study the influence of abrupt heterogeneities on deformation behaviour. While the deformation mechanisms of homogeneous coarse-grained and nanocrystalline materials are well documented, it is not clear from the current literature how these mechanisms may interact in a heterogeneous structure, and …
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Load-deformation behaviour of foundations under vertical and oblique loads
The work in this thesis explores the load-deformation behaviour of shallow and pile foundations under axial and oblique loads. A statistical review was performed on five popular shallow foundation settlement methods, which showed that different prediction methods could give highly variable results …
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Permanent Deformation Behaviour of Unbound Granular Materials in Pavement Constructions
… to establish the risk level of permanent deformations in the unbound granular layers (UGL) in pavement constructions under consideration of the seasonal effects. From this data a serviceability limit line (plastic shakedown limit) stress boundary for the unbound granular materials (UGM) …
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Characterising the deformation behaviour of human tooth enamel at the microscale
… investigates the variables that influence deformation behaviour of tooth enamel in relation to its hierarchical structure. Initially, a new method was developed for preparing flat, finely polished tooth samples that were maintained in their normal hydrated state for nanoindentation testing. …
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Deformation behaviour of additively manufactured microlattice structures : a micro-structural investigation
The aim of this research is to characterize the thin strut members that constitute metallic microlattice materials, which might be subjected to size effect phenomena and in turn would affect the performance of bulk structures. Samples manufactured by laser Powder Bed Fusion (PBF) process using 316L …
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The influence of nickel-nitrogen ratio on the deformation behaviour of austenitic stainless steels
… substitution of nickel with nitrogen has on the deformation behaviour of a metastable austenitic stainless steel, AISI 301. The effect on the tensile deformation behaviour is studied in detail at various temperatures, and the effect on impact behaviour at room temperature is given brief …
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Hot deformation behaviour of SiCp/Al composites and their matrices and an Al-Mg-Si alloy
… stresses decrease monotonically with increasing deformation temperature (T), following the same relationship as the published data. At very high temperatures, $\sigma$ is similar for all materials but as T falls to 300$\sp\circ$C, the A356 rises more rapidly than 6061. Flow stresses for the …
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On the plastic deformation behaviour of nickel-based superalloys: low cycle fatigue and stress orientation effects
… expands upon the current knowledge of plastic deformation in nickel-based superalloys, with a focus on dislocation mechanisms and the effect of microstructure. The two main topics treated are the evolution of the dislocation structure during low cycle fatigue and the effect of loading …
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The influence of nitrogen on the deformation behaviour of a modified AISI type 200 series alloy
… the influence of nitrogen concentration on the deformation behaviour of a modified AISI 200 type alloy. The Fe-18Cr-4Ni-7Mn base alloys contained a range of nitrogen contents from 0 to 0.27 wt%. The tensile behaviour was characterised by uniaxial tensile testing. The room temperature yield …
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An investigation of the failure mechanisms of thermoplastic composites at various rates of strain and temperatures
The focus of this project is on the deformation behaviour of thermoplastic composites. The materials used were polypropylene and polyamide resins with glass fibres and talc as fillers. These materials were provided by PLASTAMID (pty) ltd. The injection moulded specimens of polypropylene, polyamide …
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Impact loads on the self-elevating unit during jacking operation
… for site-specific parameters, such as soil deformation behaviour and water depth. Neither does the recommended practice for estimating impact loads by classification societies. The objective of this thesis is to develop a method of analysis by which it will be possible to make weather window …
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Validierung des nichtlinearen Verformungsverhaltens von großen Einkristall-Gasturbinenschaufeln aus CMSX-4
… crystal blades exhibit a highly anisotropic deformation behaviour and are subjected to triaxial stress fields induced by complex cooling systems. Consequently the prediction of their deformation behaviour requires constitutive equations based on multiaxial formulations. The microstructural …
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Zum Tragverhalten von textilbewehrtem Beton
… neither the load-bearing performance nor the deformation behaviour has been investigated in detail. Cracks will appear systematically in textile-reinforced concrete because of the low tensile strength of the concrete. The understanding of this cracking process is of crucial importance in …
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Modelling the constitutive behaviour of poly(ethylene terephthalate) for the stretch blow moulding process
… PET containers. Understanding and modelling the behaviour of amorphous PET (aPET) is critical for design the optimum product and process.<br/><br/>However due to its nonlinear viscoelastic behaviour, the behaviour of aPET is highly sensitive to its thermomechanical history making the task of …
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An experimental study on time-dependent behaviour of reconstituted clayey soils in 1D and triaxial compression
… structures against the time-dependent strength-deformation behaviour of soils relies on the knowledge acquired from laboratory and field experiments. Therefore, the focus of this research is to experimentally investigate the role of stress history, soil properties and loading system in the …
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Properties of Western Cape concrete with metakaolin
… to assess the influence of metakaolin on the deformation behaviour of concrete, iv) to evaluate the durability properties of concrete containing metakaolin by assessing its potential to mitigate Alkali Silica Reaction (ASR), and to reduce concrete penetrability. The study followed two …
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Zum Zusammenwirken hochfester Baustoffe in Verbundträgern
… and the impact on the bearing- and the deformation-behaviour are researched in this thesis based on tests and numerical calculations. In addition to that the design of a new single push-out test allowed the systematic investigation of the behaviour of one single stud shear connector …
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GROWTH AND MECHANICAL DEFORMATION OF ALPHA-LACTOSE MONOCRYSTALS
… in the study of the mechanical properties and deformation behaviour of alpha-lactose crystals. Chapter 2 conducts a detailed investigation into the crystallisation and growth kinetics of alpha-lactose monohydrate crystals by an agar-gel suspension technique. A large number of morphologically …
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