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.
Results
Showing 1 to 20 of 28 for “"Elastic behaviour"”.
-
Laser Shaping: A method for controlling the elastic behaviour of stretch fabrics for a targeted and graduated compressive effect on the body
… Laser melted patterns can be used to control the elastic behaviour of stretchy textiles to have a targeted and variable compressive effect on the body developed through discussion with Speedo in response to material samples produced using transmission laser welding equipment. A predominant …
-
Linear and geometrically nonlinear analysis of thin rotational shells using the finite element method
The complete elastic behaviour of rotational shell structures is investigated in the thesis, being presented in two major parts. Energy principles are implemented throughout - 'for the derivation of matrices utilizing the orthotropic strain energy expression developed by Ambartsumyan.<br/>
-
Bifurcação secundária instável em placas retangulares
The non-linear elastic behaviour in thin flat plates under the effects of initial imperfections and coupled modes is analysed in the presented work. Through this analysis it is detected, along the imperfect fundamental equilibrium path, secondary points of bifurcation which may be stable or …
-
ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΗΣ ΕΛΑΣΤΙΚΗΣ ΣΥΜΠΕΡΙΦΟΡΑΣ ΤΩΝ ΕΛΑΣΤΟΜΕΡΩΝ ΑΠΟΤΥΠΩΤΙΚΩΝ ΥΛΙΚΩΝ ΠΟΛΥΒΙΝΥΛΣΙΛΟΞΑΝΗΣ
AN EXPERIMENTAL STUDY ON THE ELASTIC BEHAVIOUR OF THE POLYVINYL- SILOXANE ELASTOMERIC IMPRESSION MATERIALS HAS BEEN MADE. YOUNG'S MODULUS OF ELASTICITY HAS BEEN STUDIED AS WELL AS SLOPE B OF THE DL-F DEPENDENCE CURVE IN THE ELASTIC AREA.ALSO, PERMANENT DEFORMATION AND FRACTURE LIMITS WERE STUDIED. …
-
Numerical investigation of theories of strain-gradient plasticity
… and micro-free boundary conditions are used. The elastic gap, that is, elastic behaviour following a change in the plastic regime from micro-free to micro-hard boundary conditions, is clearly evident. A second phenomenon studied is that of strengthening and hardening with increase in dissipative …
-
Crashworthiness of Side Impact Beams
… Element Analysis (FEA) was used to model the behaviour observed during testing. Ansys v5.4 was used for the static FEA while LS-Dyna3D v940 was used for the dynamic FEA.;The objectives of the project were to assess and then model the behaviour of the steel and composite side impact beams. This …
-
Behaviour of reinforced concrete frames with lightweight blockwork infill panels.
The current investigation concerns the behaviour of lightweight blockork infill panels bounded by reinforced concrete frames. A detailed and comprehensive review of the literature on different frame-inf ill combinations is presented. Details are given of tests on sixteen third-scale infilled frames …
-
Continuum Mechanics of Duhem’s Approach to Hysteresis
… has been widely used to describe hysteretic behaviours, particularly those observed in piezoelectric materials. In this work, we explore the thermomechanical basis of the Duhem model. In a conser-vative system, the time rate of the dependent variable (e.g., stress) is related to the time rate …
-
Biological tissue mechanics with fibres modelled as one dimensional Cosserat continua: applications to cardiac tissue in healthy and diseased states
Classically, the elastic behaviour of cardiac tissue mechanics is modelled using anisotropic strain energy functions capturing the averaged behaviour of its fibrous microstructure. The strain energy function can be derived via representation theorems for anisotropic functions where a suitable …
-
Improved seismic analysis of unreinforced masonry buildings with flexible diaphragms
… well as our basic understanding of the dynamic behaviours of buildings under earthquake excitations, cannot be applied directly for buildings with flexible diaphragms. This thesis addresses two issues that require immediate attention in improving the seismic analysis of unreinforced masonry …
-
An investigation into the behaviour of hollow ribbed (waffle) rectangular reinforced concrete slabs at ultimate limit state
The elastic to ultimate load behaviour of reinforced concrete waffle slabs subjected to uniformly distributed load and 4-point loads are reported in this thesis. A total of twenty 1/4- and one 1/2-scale reinforced concrete waffle model slabs, with different area of steel and rib depth to slab …
-
The biomechanics of the human tongue
… subroutine [24]. The transversely isotropic behaviour of the muscle tissue is accounted for, as well as the influence of muscle activation. The mechanics of the model is limited to static, small-strain, anisotropic, linear-elastic behaviour, and the governing equations are suitably …
-
Rheological characterisation of solder pastes and isotropic conductive adhesives (ICAs) for microsystems assembly technology
… observation to characterise the pastes wall slip behaviour. The second part of the study concerns an investigation of the visco-elastic behaviour of the pastes, and the main focus of the work was to determine the linear visco-elastic region using oscillatory shear stress experiments. The third …
-
CHARACTERISATION OF THE MECHANICAL BEHAVIOUR OF NETWORKS AND WOVEN FABRICS WITH A DISCRETE HOMOGENIZATION MODEL
… materials take the name of woven fabrics. The behaviour of this material is strongly influenced by the micro-structure of the material. In the thesis mechanical models and a numerical scheme able to model the mechanical behaviour of woven fabrics and general network materials have been …
-
Shape distortion and air gap formation during continuous casting.
… of an air gap. The work postulates that the behaviour of this shell can be analysed as that of a flexible structure formed by four elasto-perfectly plastic beams linked by rigid comers. This "box" represents the whole section of solidified shell at a given metallurgical height only if the …
-
THE INTERPLAY BETWEEN CATION ORDERING AND ELASTICITY OF OMPHACITES TO UNRAVEL PTT PATHS OF METAMORPHIC ROCKS
… makes it a valuable candidate for Raman elastic geothermobarometry, a method that uses the deformation recorded by mineral inclusions to determine the pressure and temperature conditions under which they were entrapped. Raman scattering, which is highly sensitive to structural …
-
Swelling behaviour of unsaturated expansive clays
… available approaches for predicting the swelling behaviour of unsaturated expansive clays:<br/>(i) simplified empirical relationships for rapidly identifying swelling soils and<br/>(ii) a more accurate prediction method suitable for design purposes and based upon experimentally measured swell …
-
Applications of Machine Learning to the Petrographic Analysis of Icelandic Gabbroic Xenoliths through Light, Electron and X-ray Microscopy
… physical parameters such aspermeability, elastic constants and seismic velocities. This is achieved by incorporatingthe reconstructions themselves into steady-state flow and elastic behaviour modelling.Overall, the present thesis aims to showcase the potential gains possible …
-
Mechanical characterisation of float and laminated glass
… its growth, the understanding of the structural behaviour of glass and mechanical properties is still not as advanced as that of other construction materials like concrete, steel, and wood [2]. During production, glass undergoes several processes, including melting of raw materials, annealing, …
Page 1 of 2