Engineering and Computer Science Graduate Poster Competition

Tomorrow (March 27, 2013), come check out what some of our MCG grads have been up to.  The Faculty of Engineering is hosting a Graduate Student Poster  Competition in the atrium of SITE.

The schedule for tomorrow is

10 a.m. Presentations begin
12 p.m. Lunch
1 p.m. Presentations resume
4 p.m. Award Ceremony & Reception

The following MCG/BMG students will be show-casing their work:

KETABCHI, Amirhossein, MASc: Influence of Nanoscale Surface Modications on the Fatigue Resistance of Medically Relevant Metals

MURILLO, Jaime Alonso, MASc: Design of a Pneumatic artificial muscle for powered lower limb prostheses

ALAM, Muhammad Faisal, MASc: Optimizing the squeeze casting process of carbon fiber reinforced aluminium matrix composites

VANDERWEL, Christina Marie, PhD: Experimental study of turbulent dispersion

DUMOND, Patrick, PhD: Inverse Eigenvalue Problems for Design Engineering

TUNDO, Marco,  MASc: Correcting Smartphone Orientation for Accelerometer-Based Analysis

DASTMALCHI, Azadeh, MASc: Estimating Blood Pressure by Artificial Neural Network

AHMADI, Nona, PhD: Investigating the hematocrit division in microcirculation network

CHOUEIRI, George H., PhD: Vortex Street Development in Eccentric Annular Channels and its Connection to Nuclear Reactor Safety

NG, Kwan-Ching Geoffrey, PhD: Hip joint stresses before and after corrective surgery for cam femoroacetabular impingement

RECOSKIE, Steven Gerald, PhD: Hybrid Power Plant Design for a Long Range Dirigible UAV

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U of O grad students to present at Carleton!

Due to a cancellation by one of our speakers, there will be no material series seminar this week and so no seminar at the University of Ottawa.

However! Two of our very own grads, Yannick Cormier and Philippe Dupuis will be presenting their work at Carleton University this Friday.  So come out to support your fellow grad students and see what Carleton has to offer.

Date: Friday 22nd March, 2013

Where:  Mackenzie Building  ME3124  (Carleton University)

When: 1:00pm

The abstracts of the talks are below.  For those of you deterred by the logistics of getting to Carleton – there is a free shuttle bus that runs between the two campuses.  See the shuttle timetable.   The Carleton shuttle bus-stop is not far from the Mackenzie building.

The background to the talks and abstracts are below.

Background

Energy efficiency has become a growing concern in a world driven by a fossil fuel economy. To this end, increasing the performance and decreasing cost, weight and volume of gas turbines has become a critical research focus. Heat exchangers such as recuperators and intercoolers help improve the efficiency of gas turbines by recovering the waste heat generated by this process. Compact heat exchangers with unit cells using wire mesh as the internal heat transfer surface have been developed at Brayton Energy Canada, but several difficulties are encountered with conventional joining techniques.

Cold Spray was successfully used to deposit an outer layer and the current study focuses on the viability of depositing fins on this outer layer. Due to process restrictions, the pressure drop across the fin array needs to be minimal, while maintaining a very high heat transfer rate per unit area.

Production of Pyramidal Fin Arrays using Cold Gas Dynamic Spraying

Philippe Dupuis

This work studies the manufacturability of pyramidal fin arrays produced using the cold spray process. Near‐net shaped pyramidal fin arrays of various sizes and fin densities were manufactured using commercially available steel wire mesh. Cold Spray parameters were determined to obtain near net shape fins. Different types of materials for the fins were successfully deposited on the compact heat exchangers, such as aluminum and stainless steel. Feedstock powders and their grains were characterized for morphology. Clogging of the wire mesh was investigated with a 30 wire per inch mask. A range of standoff distances between the different components of the system was empirically determined. Fin array characterization was performed to assess porosity levels and fin geometry.

Performance of Pyramidal Fin Arrays

Yannick Cormier

This work studies the heat transfer and fluid mechanics performance of pyramidal fin arrays produced using the cold spray process. Empirical correlations were determined between the Reynolds number and friction factor for these shapes of fins. Also, correlations between the Reynolds number and the convective heat transfer coefficient were obtained. These relations were used in a numerical model in order to determine the most appropriate fin array geometry, depending on target specifications, fluid input conditions and spatial constraints. Results obtained correlate with data published for banks of tubes with similar dimensionless pitch. A characteristic change in the performance slope at a critical Reynolds number is observed. The fins produced using the cold spray process outperform traditional straight‐cut fins at the same fin density due to increased fluid mixing and turbulence caused by the discontinuity of these features.

Amir Ketabchi and Kuan Jiang to present on Friday

You are cordially invited to the latest double-header in our graduate student seminar series.  Kuan Jiang will give a talk titled  ” Effects of Heat Treatment on Microstructure and Wear Resistance of Stainless steels and superalloys” and Amir Ketabchi will talk about  the Influence of Nanoscale Surface Modifications on the Fatigue Resistance of Medically Relevant Metals.

Time: 2:30pm

Date: Friday March 15th, 2013

Location: SITE G0103 

The abstracts of both talks are given below.  I look forward to seeing you all there!

Effects of Heat Treatment on Microstructure and Wear Resistance of Stainless steels and superalloys

Kuan Jiang

Superalloys and stainless steels are two well-known families of high temperature materials with outstanding features including superb high temperature behavior, excellent wear/corrosion resistance, and astounding mechanical properties. They are commonly used in the severe environment to combat the synergetic attack of wear, corrosion and high temperature. The present research was aimed to characterize the influences of heat treatment on the microstructure, high temperature hardness and wear resistance of superalloys and stainless steels. Two cast cobalt-based superalloys and two wrought martensitic stainless steels were selected and applied an annealing heat treatment for this study. A Scanning Electron Microscope (SEM) with X-ray detection systems is utilized to investigate the microstructure developments of selected alloys after annealing treatment. Vickers hardness tests and pin-on-disc sliding wear tests were performed on as-received and heat-treated alloys at both room temperature and elevated temperatures up to 450oC. The research demonstrated that annealing treatment promoted the diffusion of carbides and alloying elements such as molybdenum and chromium, and contributed to the formation and precipitation of intermetallic compounds in cobalt-based superalloys. For stainless steels, the annealing heat treatment either resulted in the eutectoid transformation or altered the microstructure varied from their chemical compositions. The sliding wear test results indicated the annealing heat treatment influences the wear behavior of a superalloy or stainless steel through changing its harden strength, ability to resist fracture and oxidation behavior. However, the precipitation phenomenon on some alloys caused by heat treatment can harden the entire material meanwhile decrease its ability to resist fracture. The relationships between chemical composition, microstructure, hardness, wear resistance are also discussed in this research.

Influence of Nanoscale Surface Modifications on the Fatigue Resistance of Medically Relevant Metals

Amir Ketabchi

Metal implants are relatively effective but they still need significant improvements with respect to their capacity to secure rapid and long-lasting integration in tissues. To address these challenges, different strategies have been developed to directly affect the cellular events at the material-host tissue interface. Chemical treatments such as oxidative nanopatterning and anodization are very effective tools to endow medically relevant metals (in particular titanium and Ti6Al4V) with the ability to stimulate and guide cellular events. This remarkable capacity results from the creation of distinctive nanoporous surfaces. To date, only few studies focused on mechanical aspects to ensure that such chemical approaches do not weaken mechanical properties of treated metals. Nanoporous structures could in fact act as surface defects and/or stress-raisers responsible for initiating crack nucleation and lead to premature failure. To elucidate this aspect, we have assessed the effects of oxidative nanopatterning and anodization on the fatigue resistance of pure titanium and Ti6Al4V. In particular, we aimed at investigating the fatigue performance from both quantitative (i.e. S-N curves) and qualitative (i.e. morphological SEM analysis) perspectives. Results from our study highlight the importance of mechanical considerations in the development and evaluation of nanoscale surface treatments for metallic implants.

Carleton Seminars

For those that are interested, Carleton also has a series of seminars in mechanical engineering that our students are welcomed to attend (your attendance at those seminars will also be counted as part of your seminar requirement for your degree).   All the Carleton seminars are in the Mackenzie Building in ME3124.

I have added the dates, times and seminar abstracts to our MCG seminar Calendar.  Also, the seminars on March 22 feature 2 of our own graduate students!

The last four seminars at Carleton are:

DATE SPEAKERS TITLE
Friday, March 8. 3:00pm Joana Rocha Acoustics and its Multidisciplinary Applications: Aerospace, Mechanical, Biomedical Engineering, and More…
Wednesday, March 13. 10:30am Matthew Schiedel,

Michael Brown

Team Ontario 2013 Solar Decathlon: A Lesson in High Performance Housing Design and Construction
Friday, March 15. 1:00pm Liam O’Brien Occupant-Proof Buildings: Can we design buildings that are robust against occupant behaviour?
Friday, March 22. 1:00pm

 

1. Philippe Dupuis

2. Yannick Cormier

1. Production of Pyramidal Fin Arrays using Cold Gas Dynamic Spraying

2. Performance of Pyramidal Fin Arrays

 

 

 

 

 

This Friday: Material Seminar Series

Hi everyone,

You are invited to participate in the material seminar series this Friday.

DATE:  Friday March 8th 2013

TIME:  3:00 p.m. to 4:00 p.m.

LOCATION: SITE G0103,

This week’s talk will be on Welding Engineering.  Mick Pates, the vice chair of the Ottawa Chapter of the Canadian Welding Association will talk about “Weld Failures, Almost Failures and Repair Solutions in Selected Projects”.  He is a Certified International Welding Engineer and part of his talk focuses on certain projects and products that he has been involved in, ranging from ships, offshore structures and power plants.

You can find the abstract below. This talk will take about 40 minutes and will be followed by a friendly Question and Answer session.  Refreshments will be provided. We hope to see you there!

Weld Failures, “Almost Failures” and Repair Solutions in Selected Projects

Abstract:

The presentation will begin by illustrating the breadth of the metallurgical/joining world and will then focus on certain projects and products that the author has been involved in, ranging from ships, offshore structures and power plant. Since welding of materials can be problematic if not done correctly, the presentation will also focus on some examples of failure and “almost failure”.

The range of materials covered will touch on HSLA steels, quenched and tempered steels, austenitic and duplex stainless steels among others.