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Showing 1 to 20 of 59 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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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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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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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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Material properties and mechanical behaviour of large-scale additively manufactured multi-layered steels
… on the interface between the two materials. Deformation behaviour was analyzed by the use of two-dimensional digital image correlation. Nonhomogeneous strains and Lüders banding within the mild steel directly adjacent to the SS-MS interface were observed. There is a clear increase in strength …
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Contribuição ao cálculo de recalques de estacas
… diagram. The main purpose is to evaluate the deformation behaviour of deep foundations, by means of simple methods that require a small amount of geotechnical data which are available for the design in foundation engineering. Sophisticated numerical methods like the Finite Element Method or …
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Inherent strength and stiffness anisotropy of laminated rocks
… rock masses to investigate the strength and deformation behavior of those masses. To achieve this goal, continuum-based constitutive models are presented to analyze the mechanical anisotropy. One of both implemented models is named ‘Transubi model’ which considers the transverse isotropic …
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Finite element modelling the forming of components for portable electronic devices
… costs. 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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Deformation at Low Temperatures in Single Crystal Ni-base Superalloys
… gas turbine applications has focused on creep behaviour in the high-temperature regime (above 700 °C). However, the study of deformation in the range of 20 °C to 700 °C is critical to understanding behaviour in the shanks of turbine blades in service, where the low-temperature properties of …
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