st-georges LyneUniversity of Québec in Chicoutimi | UQAC · Department of Applied Sciences (DSA)
st-georges Lyne
Doctor of mechanical engineering, MBA, P.eng.
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24
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364
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Citations since 2017
Publications
Publications (24)
There is currently a need for an efficient numerical optimization strategy for the quality of friction stir welded (FSW) joints. However, due to the computational complexity of the multi-physics problem, process parameter optimization has been a goal that is out of reach of the current state-of-the-art simulation codes. In this work, we describe an...
![Figure 4. GPU architecture (adapted from NVIDIA [32] and Ruetsch and...](profile/Kirk-Fraser/publication/308171573/figure/fig3/AS:407292634779650@1474117539572/GPU-architecture-adapted-from-NVIDIA-32-and-Ruetsch-and-Fatica-33_Q320.jpg)
In this chapter, we describe the development of a new approach to simulate the friction stir-welding (FSW) process using a solid-mechanics formulation of a mesh-free Lagrangian method called smoothed particle hydrodynamics (SPH). Although this type of a numerical model typically requires long calculation times, we have developed a very efficient pa...
The City Council of Alma, Quebec, Canada intends to erect a new footbridge celebrating the 150-year anniversary of the city. Functioning as communal and cultural ground, an island will be built on the 100 m wide River Petite Décharge hosting a pedestrian area with pathways plants and artistic installations, being a symbolic landmark. The bridge has...
Solid state joining methods comprise some of the best methods for joining aluminum alloys. The friction stir welding (FSW) process has been steadily gaining interest over the past two and a half decades. In this paper, we will introduce our work on simulating the entire FSW process using a hybrid meshfree method on the graphics processing unit (GPU...
Improving the Hall-Héroult process through reducing voltage drop in the anode assembly is one of the most challenging subjects for the primary aluminum production industry. In this paper, a fully coupled Thermo-Electro-Mechanical (TEM) model of a half carbon block submodel extracted from a full hexapod anode assembly is proposed in order to achieve...
The ramming paste behavior is a key parameter in the cell performance used for the aluminum electrolysis. This anthracite and coal tar pitch mixture bakes during the cell start-up and chemical transformations in the ramming paste are observed. The mechanical properties of the paste are related to these transformations and change with time and tempe...
Numerical simulation of complex industrial processes has become increasingly common in recent years. Depending on the nature of the industrial application, multiple types of physical phenomena may need to be considered as well as the interaction of multiple disjoint bodies. This paper is focused on industrial applications with large plastic deforma...
Friction stir welding (FSW) is increasingly gaining acceptance in industries such as aeronautical, automotive and to a lesser extent structural fabrication. Commonly, FSW is used for butt joining of aluminum, more recently, the bobbin tool FSW method was introduced. This method allows the joining of hollow core sections without the need for a backi...
![Figure 2: Hall-Héroult cell [4]](profile/Laszlo-Kiss/publication/269196238/figure/fig7/AS:668439798620174@1536379875690/Hall-Heroult-cell-4_Q320.jpg)
Full Article
In today’s context, aluminum producers strive to improve their position regarding energy consumption and production costs. To do so, mathematical modeling offers a good way to study the behavior of the cell during its life. In this paper, a fully-coupled, thermoelectro- mechanical (TEM) model of a whole hexapod anode assembly is presen...
Recognition of the friction stir welding process is growing in the aeronautical and aero-space industries. To make the process more available to the structural fabrication industry (buildings and bridges), being able to model the process to determine the highest speed of advance possible that will not cause unwanted welding defects is desirable. A...
Friction stir welding is increasingly gaining acceptance in industries such as aeronautical and aerospace. The process is not, as of yet common place in industrial fabrication of typical structures such as buildings and bridges. In order to make the friction stir welding process economical for such applications, a better understanding of how the to...
Improving the Hall-Heroult process through reducing voltage drop in the anode assembly is one of the most challenging subjects for the primary aluminum production industry. In this paper, a fully coupled Thermo-Electro-Mechanical (TEM) model of a half carbon block submodel extracted from a full hexapod anode assembly is proposed in order to achieve...
The ramming paste behavior is a key parameter in the cell performance used for the aluminum electrolysis. This anthracite and coal tar pitch mixture bakes during the cell start-up and chemical transformations in the ramming paste are observed. The mechanical properties of the paste are related to these transformations and change with time and tempe...
High boron content Al-B4C metal matrix composites are highly attractive as an excellent neutron absorber material for the storage of spent nuclear fuels. In the present paper, the mechanical properties of two composites with AA1100 matrix reinforced with 25 and 30 vol.% B4C at ambient and elevated temperatures have been investigated. The thermal st...
This paper deals with the physical modifications occurring at high temperatures and pressures at the interfaces found in the anode and cathode of a Hall-Heroult electrolytic cell. The anode and the cathode are fabricated from carbon blocks, with steel bars inserted and sealed with cast iron. Consequently, two different types of interface are found...
This paper deals with the physical modifications occurring at high temperatures and pressures at the interfaces found in the anode and cathode of a Hall-Heroult electrolytic cell. The anode and the cathode are fabricated from carbon blocks, with steel bars inserted and sealed with cast iron. Consequently, two different types of interface are found...
The weldability, microstructure evolution and mechanical properties of an AA6063 aluminium alloy and of two composites with AA6063 matrix reinforced with 6 and 10.5 vol.% B4C during friction stir welding are investigated. A joint efficiency higher than 60% was obtained and increased to over 80% after artificial ageing. The B4C particles size and sh...
The effect of low-cyclic fatigue on the elastic and microplastic behaviours of concentrated solid solutions of Al—Mg alloys
was studied using the internal friction method. For the porous alloy, it was established that the low-cyclic fatigue doesn't
influence the elasticity (Young modulus) but changes the microplasticity (internal friction level). T...
To model complex structure with numerous components and solids, the condition of contact between two solids must be adequately described. In this investigation, a special apparatus developed to analyze the condition of contact between two solids is presented. With this apparatus, experimental tests can be performed to determine the condition of fri...
Friction Stir Welding (FSW) is an interesting joining process to weld materials which cannot
easily be welded by fusion welding processes. Al-B4C Metal Matrix Composites (MMCs) can
be welded more efficiently by FSW as ceramic particles are not subject to chemical
degradation which could occur in the melt pool. In the present work, friction stir wel...
The friction stir welding is a solid-state process where intense plastic deformations and temperature fluctuations are produced by a rotating tool. In this process, the plastic deformations and the temperature field have a significant impact on the microstructural modifications observed in the welded zone and consequently, on the final mechanical p...
This study investigates the influence of laser cladding parameters on the geometry and composition of metalmatrix composite (MMC) coatings. Composite coatings are made of a Ni-Cr-B-Si metallic matrix and of WC reinforcement with a volume fraction of 50%. Optical microscopy is used to characterize the coating geometry (height, width, and penetration...
Projects
Projects (2)
Using the large deformation thermo-mechanical meshfree code, SPHriction-3D, we are able to simulate industrial processes. The simulation code uses the SPH method on the GPU, making it both efficient and robust. Typically, the GPU allows us to simulate these complex problems 20-30x faster than with an equivalent commercial SPH code.
We are currently working on:
- Large deformation meshfree shell formulation (Mindlin-Reissner)
- RPM control from temperature measurement
- Improved tool wear formulation (currently using Archard wear law)
- Full Implicit Smoothed Particle Method (FISPM)
