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 18 of 18 for “"Viscoelastic behaviour"”.
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ΣΥΜΒΟΛΗ ΣΤΗ ΜΕΛΕΤΗ ΤΩΝ ΙΔΙΟΤΗΤΩΝ ΔΟΜΙΚΩΝ ΦΥΣΙΚΩΝ ΛΙΘΩΝ ΤΗΣ ΕΛΛΑΔΑΣ
IN THE PRESENT THESIS WAS STUDY THE TECHNOLOGICAL BEHAVIOUR OF REPRESENTATIVE NATURAL BUILDING STONES IN GREECE, AIMING MAINLY AT THEIR GENERAL AND SPECIAL EVALUATION IN CONSTRUCTION. THERE WERE INVESTIGATED THE MOST CHARACTERISTIC PHYSICOMECHANICAL PROPERTIES AND THE DYNAMIC BEHAVIOUR IN THE …
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ΑΣΥΠΤΩΤΙΚΗ ΣΥΜΠΕΡΙΦΟΡΑ ΤΗΣ ΕΝΕΡΓΕΙΑΣ ΒΙΣΚΟΕΛΑΣΤΙΚΩΝ ΚΥΜΑΤΩΝ
THIS THESIS REFERS TO THE ENERGY BEHAVIOUR OF A LINEARIZED VISCOELASTIC MODEL, IN AN ISOTROPIC AND HOMOGENEOUS MEDIUM WITH QUIET PAST, WHOSE VISCOELASTIC BEHAVIOUR IS EXPRESSED BY MEANS OF RELAXATION FUNCTION WHICH DECAY EXPONENTIALLY INTIME. A REGULAR DISTURBANCE WITH COMPACT SUPPORT IS …
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Analysis of a bonded joint using bulk adhesive properties
… would allow the analytical prediction of the viscoelastic behaviour of a bonded joint, using bulk adhesive properties. The Arcan joint geometry was chosen because of the simple state of stress within the adhesive.
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Multi-scale analysis of wrinkling during consolidation of thermoset composites
… fibre waviness, misalignment and the complex viscoelastic behaviour of a composite’s layered structure during cure are the primary causes of defects, wrinkle formation, and eventual rejection of large composite components. However, the relationship between these factors and the wrinkling of …
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The rheology of silicon nanoparticle inks fro screen printing electronic devices
… electronics, it is important to understand the behaviour of the functional inks and more especially their rheology and surface properties. This project emphasises the importance of ink characterization by performing rheological tests on silicon nanoparticle based inks that are used in the screen …
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Viscoelastic and fracture behaviour of polyolefin based nanocomposites
… silica (SiO2) micro and nanoparticles on the viscoelastic and fracture behaviour of LLDPE based composites, prepared through a melt compounding process. Different typologies of silica filler have been considered : hydrophilic and hydrophobic fumed silica nanoparticles with different surface …
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ΚΡΙΤΗΡΙΑ ΙΞΩΔΟΕΛΑΣΤΙΚΗΣ ΣΥΖΕΥΞΗΣ ΜΑΚΡΩΝ ΟΣΤΩΝ ΚΑΙ ΟΣΤΙΚΟΥ ΤΣΙΜΕΝΤΟΥ
… BONE-CEMENT, IS THE UNSUITABLE MATCHING OF THEIR VISCOELASTIC PROPERTIES. IN THE PRESENT STUDY, THE VISCOELASTIC BEHAVIOUR OF FRESH LONG BONES IS EXAMINED, AND IT IS COMPARED TO THE RESPECTIVE BEHAVIOUR OF BONE-CEMENT. WITHIN THIS FRAMEWORK, THE STATIC AND THE CREEP BEHAVIOUR OF WHOLE FRESH SHEEP …
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Vector offset operators for deformable organic objects.
… of living tissues exhibit complex deformable behaviours that may be characteriseda s organic. In computer animation, deformable organic material behaviour is needed for the development of characters and scenes based on living creatures and natural phenomena. This study addresses the problem of …
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STUDIES ON THE DEFORMATION OF COMPACTS
… pressures of up to 200 MPa, the recompression behaviour of a range of materials has been investigated, by the determination of force v displacement curves for preformed compacts. For each of the materials tested, cyclic recompression resulted in energy dissipation. which was largely of …
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An experimental and theoretical study of the flow about spheres and discs rotating slowly in viscoelastic fluids
… diameter. Both Natrosol solutions exhibited viscoelastic behaviour in all cases. The Newtonian fluid study is at a Reynolds number of 1,2: all viscoelastic fluid studies are within the range of Reynolds numbers of 0,05 to 1,24. The zero shear viscosities of the Natrosol solutions are measured …
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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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A study of structure-property relationships in certain polymeric dental materials
… by comparing their stiffness, strength, viscoelastic behaviour, and hardness. The variables studied were: temperature, pressure, material condition, crosslinking agent concentration, concentration of BisGMA/THFMA, monomer:<br/>polymer ratio, and the initiator concentration. It was found …
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Studies on the hydro-thermal and viscoelastic properties of leather
The temperature dependent viscoelastic behaviour of synthetic polymers has been shown to be of high importance for their properties and applications. However for leather this aspect of viscoelasticity has not been studied. In order to further the understanding of structure-property relationships, …
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Speed and Temperature Effects in the Energy Absorption of Axially Crushed Composite Tubes
… mass involved. Polymers are known to display viscoelastic behaviour and polymer composites are similarly sensitive to test speed and temperature. Energy absorption in tube crushing has been shown to be speed and temperature sensitive and the purpose of this project has been to understand the …
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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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Fluid-Structure Interaction of Large Viscoelastic Vessels Under Pulsatile Conditions
… Second, the instantaneous elasticity and dynamic viscoelastic properties of a porcine ascending aorta were calculated and compared to results from dynamic uniaxial testing. The instantaneous elasticity of the intact aorta matched well with uniaxial results, while the viscoelastic properties …
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Rheology and microscopy of low calorie mayonnaise-type emulsions made with stearic acid- modified maize and teff starches
… the rheological properties (flow properties and viscoelastic behaviour), microstructure (using light and confocal laser scanning microscopy), and freeze-thaw and high temperature stability of low-calorie mayonnaise type emulsions (LCMTE). Starch suspensions (10% w/v of starch in water) containing …