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 51 for “"visco-elastic"”.
-
Study in visco-elastic wave propagation by photoviscoelasticity, A
Includes bibliographical references.
-
Long waves in water over a visco-elastic muddy seabed
… of numerical solutions. The model is extended to viscoelastic mud, using the results of four experiments carried on different types of muds. These muds range from very elastic to rather viscous, allowing us to compare hie differences in behavior. Surface and interface variations. mud drift current …
-
Thermal fracture service life analysis of a case bonded visco-elastic cylinder
Environmental temperature changes produce cyclic thermal stresses in structures. Because temperature and hence thermal stresses are random and mechanical properties such as strength, relaxation modulus, and fracture toughness are time and temperature dependent as well as statistically variable …
-
Visco-Elastic Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
Visco-Elastic Nonlinear Constitutive Model for the Large Displacement Analysis of Multibody Systems.
-
Gravity, capillary and dilational wave mode resonance at a visco-elastic two-fluid interface
… aqueous solutions and also waves traveling on a visco-elastic fluid at a variety of temperatures. In addition to the wave data we obtained, we also measured in-situ surface tension. Analyzing the experimental data, we demonstrated the effects of modulation of one wave mode on another. We obtained …
-
Thermally driven visco-elastic measurement technique via spectral variations in scanning probe microscopy cantilevers
… range and resolution required to quantify the visco-elastic fluid properties in the interfacial regime. With the availability and versatility of AFMs and the mounting models and data related to the performance of SPM probes in a fluid environment, the AFM is an attractive platform to exploit. …
-
A Non-linear Visco-elastic Model for Dynamic Finite Element Simulation of Bovine Cortical Bone
… situations is to describe the material model as visco-elastic, as reported by Shim et al. [1], Bekker et al. [2] and Cloete et al. [3]. The work by Shim et al. and Bekker et al. developed three-dimensional models, but do not accurately capture the transition in behaviour in the intermediate …
-
An internal variable theory for isotropic visco-elastic-plastic solids : application to indentation of amorphous polymeric solids
… phenomenologically capture the large deformation elastic-viscoplastic response of these materials in a reasonably accurate manner, they do not adequately account for the creep response of these materials at stress levels below those causing "macro-yield", as well as the Bauschinger-type reverse …
-
The influence of visco-elastic processes on the generation of thermal stresses in quenched low alloy steel plates.
The visco-elastic effect in quenched specimens of 835M30 steel was described quantitatively by the use of the standard linear solid, which allowed the calculation of the thermal stress and strain during quenching in water, oil and in a martempering situation. The introduction of viscous flow into …
-
Analysis of a one-dimensional nonlinear mechanical model and its application to the qualitative explanation of the visco-elastic behavior of aluminum from sonic tests
… aluminum and for a qualitative analysis of the visco-elastic behavior of this material. Young's modulus of elasticity is determined for aluminum bars with various lengths and cross sections using the resonant frequency (in flexure) of each bar. This property varies linearly with the length to …
-
An observational study to assess coagulation abnormalities in patients with elevated levels of urea and/or creatinine secondary to renal failure, presenting for renal biopsy – challenging conventional testing using visco-elastic testing
… as its breakdown. TEG® and ROTEM® assesses the visco-elastic properties of blood in vitro to define in vivo coagulability. The standard of care in our institution to assess the bleeding risk in patients with renal failure (defined by a raised urea and/or creatinine level) presenting for a renal …
-
Binder Film Thickness Effect on Aggregate Contact Behavior
… voids, asphalt mixture could be considered as a visco-elastic material in the low stress level. Since the behavior of the mixture depends largely on the relationship of different components, a well developed contact model for micro-structural modeling is very important for understanding the …
-
Numerical and Experimental Study of Rock Fracture Creep Under Dry Conditions
… of Musandam limestone (a reservoir rock). The elastic and strength properties of Musandam limestone were obtained from triaxial and indentation tests. The results indicate that linear elasticity and von Mises plasticity can reasonably well describe the contacting asperity deformation. Then, …
-
The biochemical characterisation of respiratory mucus & mucins in normal, asthma & COPD
… death in South Africa. Mucus is a viscid, slimy visco-elastic gel-like material, which coats the epithelial tissue of gastrointestinal, reproductive and respiratory tracts. Mucus has defined rheological properties that enable it to be transported out of the lungs by mucociliary clearance.
-
Creep buckling of shells of revolution loaded under uniform external pressure
… the complete sphere. The linear and non-linear visco-elastic material idealizations are used in the various theoretical procedures. The critical buckling time is greatly influenced by the parameter a/h ratio, magnitude of initial imperfections and material selection. The spherical shell has a …
-
Physical representation of tension caused by harmonic progression
… progression onto the surface tension of a visco-elastic sphere. The level of distortion on the sphere surface is made to correspond to the amount of tension in the music. Additionally, the elastic property of the sphere reflects the relaxation or resolution phases in tonal music which …
-
The effect of very high hydraulic pressure on the permeability and salt rejection of reverse osmosis membranes
… - likely due to membrane compaction. A simple visco-elastic model was shown to be able to model the overall shape of the permeability curve in time. However, this model does not match the data well when pressure is removed and then reapplied. From the perspective of membrane performance, RO is …
-
Methodology to Validate Traffic Speed Deflection Devices (TSDDs) Measurements Using Laser Doppler Vibrometers (LDV) Sensors
… using a calibrated three-dimensional visco-elastic finite element (3D-FE) model developed in Abaqus. The model simulated dynamic pavement response under APT loading conditions, incorporating visco-elastic material properties, three-dimensional contact stresses, and continuous moving …
-
Extensional rheology of bread dough
… this Rheometer permitted us to investigate the visco-elastic nature of the dough well into the baking/proofing range. Special experimental protocols and modifications to the rheometer fixtures were designed and built to overcome problems in sample preparation. Parameters such as water content, …
Page 1 of 3