SOE - Scholarly Publications: Recent submissions

Now showing items 121-140 of 693

Effect of the presence of pre-service construction cracks in concrete decks on the thermal profile of composite steel-concrete bridges in cold regions

Abi Shdid, Caesar; El Masri, Omar Y. (ASCE, )

Thermally induced stresses in composite steel-concrete bridges are higher than those experienced by their concrete and steel cousins, leading to significant damage in the concrete deck and corrosion of the steel reinforcement. ...
High surface area electrodes in ionic polymer transducers

Akle, Barbar J.; Wallmersperger, Thomas; Akle, Etienne; Leo, Donald J.

Ionomeric polymer transducers have received considerable attention in the past ten years due to their ability to generate large bending strain and moderate stress at low applied voltages. Ionic polymer transducers consist ...
Chemo-electric characterization and modeling of the high surface area electrodes in ionic polymer transducers

Akle, Barbar J.; Wallmersperger, Thomas; Akle, Etienne; Leo, Donald J.

Ionomeric polymer transducers have received considerable attention in the past ten years due to their ability to generate large bending strain and moderate stress at low applied voltages. Ionic polymer transducers consist ...
High conductivity ionic liquid- nafion mat composites for high speed ionic polymer transducers

Akle, Barbar; Leo, Donald J.; Nah, Changwoon; Kader, Abdul M.

Ionomeric polymer transducers consist of an ion-exchange membrane plated with conductive metal layers on the outer surfaces. Such materials are known to generate large bending strain (> 9% is possible) at low applied ...
Consideration of ionic polymer materials as flapping mechanisms for micro-air vehicle

Akle, Barbar; Leo, Donald

Ionic Polymers are soft actuators that perform large bending and flapping deflections when a small voltage is applied across their thickness. Due to their mechanical similarities to biological muscles and their large ...
Modeling and experimentally characterizing ionic buoyancy engines

Akle, Barbar J.; Nasser, Jalal; Hijazi, Ahmad

There is a need for buoyancy engines to modulate sensor depth for optimal positioning and station-keeping. Compared to current technologies, Ionic Buoyancy Engines does not have any moving parts. They are energy efficient ...
Design and manufacturing of an array of micro IPMC hair-like sensors

Akle, Barbar J.; Tawk, Charbel; Challita, Elio

Ionic Polymer Metal Composites (IPMCs) are known to be compliant, reliable and able to produce a large current when deformed under a wide range of frequencies. In a previous study, our group demonstrated that cylindrical ...
Multi-scale modeling of ion transport in high-strain ionomers with conducting powder electrodes

Akle, Barbar; Leo, Donald J.; He, Xingxi

Ionomeric polymer transducers exhibit electromechanical coupling capabilities. The ion transport due to electric stimulus is the primary mechanism of actuation for a class of polymeric active materials known as ionomeric ...
Investigation of the physics of transduction in nafion / Ionic liquid composite membranes

Akle, Barbar; Leo, Donald; Bennett, Matthew (ASME, )

Ionomeric polymer actuators based on Nafion membranes exhibit large bending motion (1%) under the application of small voltages (1-5 V). Actuation in these materials is believed to arise from the field-induced motion of ...
Active laminar mixing induced by surface disturbance

Akle, Barbar; Williams, Alicia; Vlachos, Pavlos (ASME, )

Traditionally, passive mixers and chaotic advection have played a key role in the field of microfluidics by stretching and folding the fluid. Some examples of these passive mixing techniques include channels with riblets ...
A design model for bending and extensional ionic polymer transducers

Akle, Barbar J.; Leo, Donald J. (ASME, )

Ionomeric polymer transducers have received considerable attention in the past ten years due to their ability to generate large bending strain (~10%) and moderate stress at low applied voltages (~2V). Bending transducers ...
ModelAngelo

Akle, Barbar; Smaili, Ahmad; Hemadeh, Ramsey; Zeineddine, Firas (ASME, )

This paper presents a new complete CAD-driven rapid prototyping system for polystyrene. ModelAngelo, as it is called, consists of six subsystems featuring hardware and software. The system utilizes a virtual 3D CAD model ...
Investigation of extensional actuation strain in ionomeric polymer transducers

Akle, Barbar J.; LEo, Donald J. (ASME, )

Ionomeric polymer transducers have received considerable attention in the past ten years due to their ability to generate large bending strain and moderate stress at low applied voltages. Bending transducers made of an ...
A feasibility study on establishing wind farms in Lebanon

Nakad, Z.; ElKhoury, M.; Arnaout, J.-P.; Shatila, S.

There is a great benefit for a community to utilize renewable energy such as wind power in providing its power needs. These benefits can be listed under two categories, environmental and economic. If wind power is to be ...
Topology and parameter estimation in power systems through inverter-based broadband stimulations

Margossian, Harag; Neshvad, Surena; Sachau, Jurgen

An increasing number of inverter-based power generators have been connected to the distribution network in recent years. This phenomenon coupled with the adoption of open energy markets has significantly complicated the ...
Warm carbon coat reduces friction

Habchi, Wassim; Scott, Bair; Bjorling, Marcus; Larsson, Roland

A coating material made of carbon reduces friction not just by providing a slippery surface, but also by keeping the points of contact warm. Marcus Björling at Luleå University of Technology in Sweden and his team coated ...
Towards the true prediction of EHL friction

Habchi, W.; Bjorling, M.; Larsson, R.; Marklund, P.

The capability to predict elastohydrodynamic film-thickness and friction from primary measurements of transport properties of liquid has been an elusive goal for tribologists for 50 years. Most comparisons between predictions ...
Effect of lubricant rheology on friction in coated elastohydrodynamic lubricated contacts

Habchi, W.; Bair, S.

This work investigates the effect of lubricant rheology on friction in coated elastohydrodynamic contacts. Two lubricants with relatively different properties are selected and two coating configurations are considered. The ...
Coupling strategies for finite element modeling of thermal elastohydrodynamic lubrication problems

Habchi, W.

This paper investigates coupling strategies for finite element modeling (FEM) of thermal elastohydrodynamic lubrication (TEHL) problems. The TEHL problem involves a strong coupling between several physics: solid mechanics, ...
An exact and general model order reduction technique for the finite element solution of elastohydrodynamic lubrication problems

Habchi, W.; Issa, J. S.; SOE; 200804200; 200803943; Industrial And Mechanical Engineering; wassim.habchi@lau.edu.lb; jimmy.issa@lau.edu.lb; Lebanese American University

This work presents an exact and general model order reduction (MOR) technique for a fast finite element resolution of elastohydrodynamic lubrication (EHL) problems. The reduction technique is based on the static condensation ...

Now showing items 121-140 of 693

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