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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 66 for “"Asperities"”.
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Failure Modes of Asperities in Rock Discontinuities
… role of tensile failure in fracture process of asperities under direct shear loading. The result of this work can be combined with future research to develop a more meaningful relationship between the peak shear strength of the rock joints and the applied normal stress.
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Scratching by pad asperities in chemical mechanical polishing
… are too hard, have too much friction, have asperities that are too sharp, or some combination of these factors. Reengineering CMP pads and slurries is thus recommended to alleviate scratching by pad asperities.
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Contact between models of rough surfaces containing spherical asperities
… elasto-plastic deformation of contacting surface asperities are reviewed. The effect of tangential loading upon the area of contact is also reviewed. In order to implement a previously established goal of observing the nature of contact between transparent models of scaled-up surfaces, a procedure …
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Micro-scale scratching by soft pad asperities in chemical-mechanical polishing
… random, rough surface of the pad, only the tall asperities contact the wafer and transmit the necessary down force and motion to the abrasive particles for material removal. As the applied pressure is concentrated under few asperities, however, the asperities themselves, even though softer, may …
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An Investigation into the Effects of Asperities on Geomembrane/Geotextile Interface Shear Characteristics
… failure occurrence at the GMB/GTX interface, asperities have been incorporated into GMB manufacturing to increase the shear characteristics. Presently, many GMB with various asperities properties is now available because of asperities proven advantage. Challengingly, only a few studies have …
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Failure of asperities by hydraulically induced fatigue: a model for the generation of intraplate seismicity
… are triggered by the tensile failure of asperities by subcritical crack growth. The principle subcritical crack growth mechanism is fatigue driven by cyclic tensile stresses within an asperity. Cyclic stresses result from cyclic pore pressure variations which propagate from the Earth's …
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Investigating Wetting Characteristics on Microstructured Surfaces for Superhydrophobicity and Metal Microcasting
… for liquid droplets suspended on the surface asperities. For a surface with regularly spaced asperities, as curvature becomes more positive, droplets suspended on the tops of asperities are suspended on fewer asperities. Curvature affects superhydrophobicity because microscopic curvature …
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Friction and lubrication in metal rolling
… in metal rolling. Secondly, the deformation of asperities when the bulk material is deforming has been examined. The theory developed here was found to agree reasonably with experiments. The results of these investigations are used in the analysis of lubrication in metal rolling, considering the …
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Physical Optimization of Acid Fracturing with Unified Fracture Design
… etching on the fracture walls, creating asperities. These asperities hold up the fracture wall, thus contributing to fracture conductivity. Acid fracturing is used mainly to stimulate carbonate rock. This technique has certain advantages over conventional fracturing. There is no proppant …
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Investigating wetting characteristics on microstructured surfaces for superhydrophobicity and metal microcasting
… for liquid droplets suspended on the surface asperities. For a surface with regularly spaced asperities, as curvature becomes more positive, droplets suspended on the tops of asperities are suspended on fewer asperities. Curvature affects superhydrophobicity because microscopic curvature …
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Contact resistance in RFID chip-antenna interfaces
… can be reduced. Moreover, an analysis including asperities on the micro scale geometry of the solids was conducted. In the final approach to the problem, a random distribution of asperity types was analyzed. An expression was derived for the total force applied in terms of a given deflection and …
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Controls on earthquake rupture and triggering mechanisms in subduction zones
… that long-lived frictional heterogeneities (asperities) are primary controls on the rupture extent of large earthquakes. To determine when and where stress is accumulating on the megathrust that could cause one of these asperities to rupture, this thesis develops a new method to invert …
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Controls on earthquake rupture and triggering mechanisms in subduction zones
… that long-lived frictional heterogeneities (asperities) are primary controls on the rupture extent of large earthquakes. To determine when and where stress is accumulating on the megathrust that could cause one of these asperities to rupture, this thesis develops a new method to invert …
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Investigation on Physics-based Multi-scale Modeling of Contact, Friction, and Wear in Viscoelastic Materials with Application in Rubber Compounds
… neglects the effect of elastic coupling between asperities. The second method is based on an improved version of GW theory, which considers the elastic coupling effect of asperities in an approximate way. The third method is based on the distribution of local peaks of asperities, which is …
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Fault plane structure of the 1995 Antofagasta Earthquake (Chile) derived from local seismological parameters
… their adjacent areas. These patches are called asperities which obviously have a strong influence on the mainshock rupture propagation. Condition and properties of structures in the fault plane area, which are responsible for the evolution of such asperities or their significance on damage …
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The role of heterogeneity in long-range interacting systems : from nucleation to earthquake fault systems
… Heterogeneity is introduced in the form of asperities with the intent of modeling the effect of hard rocks on earthquake statistics. The asperities are observed to be a crucial element in explaining the behavior of aftershocks resulting in Omori's law. A second form of heterogeneity is …
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A study of static and dynamic robustness of hydro/omniphobic surfaces
… differences across the interfaces between the asperities. These distorted interfaces play an essential role in the transition from the composite Cassie-Baxter state to the fully-wetted Wenzel state and in the determination of the robustness of the composite state. As well as the static pressure …
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Modeling of the great earthquake seismic cycles
… to study the interaction between two large asperities at a subduction interface separated by an aseismic gap of varying width. The novelty of the model is that it considers behavior of the asperities during multiple seismic cycles. As expected, models show that an aseismic gap with a narrow …
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Finite element based modeling of multi-asperity contact and validation of Greenwood-Williamson model
… were created. All geometries consisted of 25 asperities positioned on a 2-dimensional grid. Finite Element (FE) models corresponding to different geometries were created and executed. Each model consisted of ~1-3 million degrees of freedom. To our knowledge, this kind of intense FEA simulation …
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ΧΑΡΑΚΤΗΡΙΣΤΙΚΕΣ ΠΑΡΑΜΕΤΡΟΙ ΣΕΙΣΜΙΚΗΣ ΠΗΓΗΣ ΜΕ ΤΗ ΜΕΘΟΔΟ ΤΗΣ ΑΝΤΙΣΤΡΟΦΗΣ ΤΩΝ ΚΥΜΑΤΩΝ ΧΩΡΟΥ: ΕΛΛΑΔΑ ΚΑΙ Η ΕΥΡΥΤΕΡΗ ΠΕΡΙΟΧΗ ΤΗΣ
… THE STRESS DROP CALCULATED FOR THE INDIVIDUAL ASPERITIES RECOGNIZED IN THE RAPTURE PROCESS. SOURCE PARAMETERS HAVE BEEN CALCULATED WITH THE MOST RELIABLE COMPUTATIONAL TECHNIQUE TO DATE.
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