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Fretting Wear and Fatigue Analysis of a Modular Implant for Total Hip Replacement

M.S. Yeoman[1], A. Cizinauskas[1], D. Rangaswamy[1]
[1]Continuum Blue, Tredomen, Ystrad Mynach, United Kingdom

Modular orthopaedic devices are a feature of total joint replacements today. These modular orthopaedic devices allowing surgeons to choose from a variety of available implant sizes, designs & material options for the procedure required and the patient specific requirements. However, even though this allows for greater scope of implant construction, if the various components of the modular design ...

Modeling Flow and Deformation During Salt-Assisted Puffing of Single Rice Kernels - new

T. Gulati[1], A. K. Datta[1]
[1]Department of Biological & Environmental Engineering, Cornell University, Ithaca, NY, USA

Puffing of biomaterials involves mass, momentum and energy transport along with large volumetric expansion of the material. Development of physics-based models that can describe heat and moisture transport, rapid evaporation and large deformations can help understand the puffing process. In this context, a fundamentals based study of salt-assisted puffing of rice is described. A multiphase model ...

Multiphysics Modeling of Spring-Supported Thrust Bearings for Hydropower Applications

F.X. Borràs[1], J. Ukonsaari[2], A. Almqvist[1]
[1]Luleå University of Technology, Luleå, Sweden
[2]Vattenfall Research and Development, Luleå, Sweden

Spring-supported thrust bearings are used in huge rotor dynamic machines, generally to support the shafts from the biggest hydropower generators. Any attempt of modifying yhis type of thrust bearing implies huge investment and is associated with some risks. The goal of the present work is to predict the performance of spring-supported thrust bearings. With the model it is possible to carry out ...

Mitigation of Greenhouse Gas Leakage from Oil and Gas Wells

J. S. Crompton [1], H. Spencer [2], J. Thomas [1], K. Koppenhoefer [1]
[1] AltaSim Technologies, Columbus, OH, USA
[2] Seal Well, Calgary, AB, Canada

Pre-existing oil and gas wells and well bores represent highly permeable pathways for leakage of greenhouse gases; in Alberta alone leaks have been estimated to provide the equivalent of 3.5 million tonnes of CO2 per annum. In addition to abandoned wells without plugs, gas leakage may occur when the integrity of wells is compromised by a variety of factors including incomplete construction or ...

FEM Study on the Effect of Metallic Interdigital Transducers on Surface Acoustic Wave(SAW) Velocity in SAW Devices

A. K. Namdeo, and H. B. Nemade
Department of Electronics and Electrical Engineering
Indian Institute of Technology Guwahati
Assam, India

In this paper, we present study on the mass loading effect of the interdigital transducer (IDT) on surface acoustic wave (SAW) velocity in SAW devices, using COMSOL Multiphysics. We have simulated a one port SAW resonator made on YZ lithium niobate substrate and investigated the reduction of SAW velocity caused by the mass loading of aluminum IDT fabricated over the substrate, using finite ...

Simulation of a Dual Axis MEMS Seismometer For Building Monitoring System

M. A. Shah [1], F. Iqbal [1], B. L. Lee [1],
[1] Korea University of Technology and Education, Cheonan, Chungcheong, South Korea

A dual axis MEMS seismometer targeted for building monitoring system has been simulated for a full scale of ±5g acceleration. The design uses the capacitive effect for vibration sensing. This comb drive capacitive MEMS seismometer consists of 8 springs with two proof masses. The device is very low cross axis sensitive (almost negligible cross axis error). The cross axis sensitivity of x-axis is ...

Study of Hard-and Soft- Magnetorheological Elastomers (MRE’s) Actuation Capabilities

J. Roche[1], P. Von Lockette[1], and S. Lofland[2]
[1]Mechanical Engineering Dept., Rowan University, Glassboro, NJ
[2]Physics and Astronomy Dept., Rowan University, Glassboro, NJ

In this study, magneto-rheological elastomer (MRE) composite beams made of Barium hexaferrite (BaM) and Iron (Fe) powders combined with a highly-compliant matrix material were simulated using COMSOL\'s Solid Mechanics and AC/DC modules. The goal of the work was to develop models capable of predicting the actuation behavior of hard- and soft-magnetic MREs. This work simulates the bending of ...

Rheological and Topographical Controls on Deformation Due to a Shallow Magma Reservoir - new

J. H. Johnson[1]
[1]University of Bristol School of Earth Sciences, Bristol, UK

The use of high-resolution topography in the finite element model demonstrates that deformation from a shallow pressure source can be dramatically affected by overlying relief, not only in magnitude, but also in azimuth. This result is significant as it allows traditionally anomalous data to be evenly weighted during inversions for magma reservoir parameters. The result that surface ...

Development of a 10 kW Microwave Applicator for Thermal Cracking of Lignite Briquettes

B. Lepers [1], G. Link [1], J. Jelonnek [1]
[1] Karlsruhe Institute of Technology, Institute for Pulsed Power and Microwave Technology, Karlsruhe, Germany

Introduction: The use of microwave energy for thermal cracking (from thermal stress and water pore pressure) of lignite-coal briquettes increases the lignite friability [1] and is beneficial for later chemical treatment inside a gasifier (for methanol production for example). An adequate use of microwave energy can improve the overall efficiency of the gasification process based on lignite ...

Identification of the Complex Moduli of Orthotropic Materials using Modal Analysis

F. Van den Abeele[1], J.R. De Oliveira Jr.[2], and F.J. Huertos[1]
[1]OCAS N.V., J.F. Kennedylaan 3, Zelzate, Belgium
[2]Federal University of Minas Gerais, Belo Horizonte, Brazil

It is very difficult to measure the global properties of heterogeneous and anisotropic materials like composites and sandwich structures. When designing composite sandwich applications, the elastic properties are required to perform structural stiffness and strength calculations. However, due to their anisotropic nature, it is not straightforward to measure these properties with traditional ...