Julie Lévesque

• PhD
• Project Manager at Quebec Metallurgy Center

Boring process, also referred to internal turning, is commonly used to machine critical features of landing gear components like struts, brackets, and main cylinders. Over the past years, extensive research efforts have addressed the stability of the process by developing instrumented boring bars and advanced monitoring techniques. However, althoug...

To ensure reliable power transmission, maintaining high thermal stability in aluminum conductor cables is essential, as strength degradation may occur due to the increased temperature of overhead cables during service. This study examined the strength degradation of an ultrafine-grained hypoeutectic Al-Si alloy by investigating its microstructural...

Hypoeutectic Al-Si alloys are promising candidates for novel Al conductor cables; however, their limited electrical conductivity (EC) and mechanical strength hinder their widespread industrial applications. This study investigates the influence of two thermomechanical processing routes-conventional (C-TMP) and modified (M-TMP)-on the microstructura...

Hypoeutectic Al-Si alloys are increasingly recognized as promising materials for aluminum conductor cables owing to their remarkable combination of high strength and castability. However, the widespread industrial application of these alloys is limited by their moderate electrical conductivities (ECs). In this study, we explored the effects of dire...

This study investigated the effects of annealing on the microstructure, mechanical properties, and electrical conductivity (EC) of AA4043 rods produced through the Properzi CCR process. Annealing was conducted at two temperatures (200 °C and 300 °C) for 4 h. Characterization techniques were performed on the rod samples, including optical microscopy...

Convolutional neural networks (CNNs) find vast applications in the field of image processing. This study utilises the CNNs in conjunction with the crystal plasticity finite element method (CPFEM). This research presents a framework that enables CNNs to make rapid and high-fidelity predictions for materials under uniaxial tension loading. The inputs...

The prediction of dynamic crushing behavior of aerospace-grade composites is a hard challenge for researchers. At coupons scale, such behavior implies the understanding of the initiation and propagation of the elementary damage mechanisms. Many results of the research confirm that the modulus and strength of composites increases with strain-rate. T...

Residual stresses on aluminum parts can be modified during heat treatments. During solution heat treatment, quenching, and aging, metallurgical transformations combined with thermal gradients lead to a modification of parts properties. Quench and aging treatments sensitivity of AA 7175 aluminum alloy components is addressed in this work. Samples ha...

Machine learning (ML) methods are commonly used for pattern recognition in almost any field one could imagine. ML techniques can also offer a substantial improvement in computational time when compared to conventional numerical methods. In this research, a machine learning and crystal plasticity-based framework is presented to predict stress–strain...

In composite aircraft structures, woven carbon-fiber-reinforced composites are used as elements of the boxes to mitigate damage during crash events and provide a measure of protection for the passengers against abrupt decelerations. Due to their multi-scale damage effects and complex coupling between failure mechanisms, despite years of extensive w...

In crash event, aerospace structures are designed to collapse progressively, dissipating high kinetic energy and protecting the passengers against abrupt decelerations. To achieve this goal, a better comprehension of crash failure mechanisms is necessary to improve traditional crash structures by designing and optimizing new energy absorbers. In th...

This paper presents a new full-field, efficient and mesh-free numerical framework to model microstructure evolution, dynamic recrystallization (DRX) and formability in hexagonal closed-packed (HCP) metals such as magnesium alloys at warm temperatures. A rate tangent-fast Fourier transform-based elasto-viscoplastic crystal plasticity constitutive mo...

Phenomenological models are required to predict the behaviour of a glass fibre reinforced Sheet Moulding Compound (SMC) composite material for use in the automotive industry. Material testing is conducted in tension, compression, in-plane shear, and three-point bending. The SMC composite exhibits tension-compression asymmetry and in-plane anisotrop...

For predicting the mechanical response of mis aligned short fibre composite materials a two step homogenization procedure coupled with orientation averaging of the elastic material properties is often used. Orientation averaging is not valid for long fibre composites due to non-symmetric strain localization tensors. A method to homogenize the stres...

Leading-edge infrastructure renovation is driven by innovations in materials processing to optimize desired properties. The immediate challenge for the metal industry is the development of effective and efficient materials quality-control practices. At present, mechanical and sheet forming properties are assessed using standard tensile tests to mea...

Dry machining is one of the reliable eco-friendly techniques since it enables avoiding the use of harmful/expensive cutting fluids, reducing part costs, and increasing productivity. This study attempts to optimize the dry peripheral milling conditions with regard to the surface finish and residual stress (RS) of machined aeronautical Al–Zn–Mg–Cu al...

Small-angle X-ray scattering studies of microstructure in metallic systems are prone to contamination by double Bragg scattering from the crystalline matrix. This is particularly problematic to the study of fracture in ductile metals via the nucleation and growth of nanovoids in response to plastic deformation. We show clear evidence of the presenc...

High–speed machining (HSM) is widely used in the manufacturing of monolithic aluminum components for automotive and aeronautical industries. However, previous research studies on HSM of high strength aluminum alloys have shown that serrated and/or elemental chips can form at critical cutting conditions, impacting the machining stability and final p...

A unit cell model is developed to capture the elasto-visco-plastic response of a long fibre composite using a 3-dimensional finite element model. Using a glass rubber model, the elasto-visco-plastic response of the matrix is analysed and the fibre is considered to deform elastically. A functionally graded interphase zone is defined in the region su...

Shot peening is widely used in automotive and aeronautic industries to improve fatigue life of metallic components. Its beneficial effects are mainly due to the residual stress field caused by the plastic deformation of the near-surface region resulting from multiple shot impacts. It is therefore important to know the values of the induced residual...

In this paper, a new constitutive framework based on a rate-dependent crystal plasticity theory is presented to simulate large strain deformation phenomena in HCP metals such as magnesium. In this new model the principal deformation mechanisms considered are crystallographic slip and deformation twinning. The new framework is incorporated into in-h...

A constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate large strain deformation in hexagonal closed-packed metals that deform by slip and twinning. The model allows the twinned zones and the parent matrix to rotate independently. ZEK100 magnesium alloy sheets which significant texture weakening compared...

In this paper, a constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate localized deformation phenomena in hexagonal closed-packed (HCP) metals such as magnesium. A new and simplified method to account for deformation twinning is proposed. The new framework allows the twinned zones and the parent matrix t...

A unit cell model based on the interaction between the fibre and a matrix at the micromechanics scale for a long fibre reinforced composite is developed. An interphase zone is defined to describe the load transfer between the fibre and matrix. The interphase zone has functionally graded properties, and occupies a region including the physical bound...

Although it is one of the most commonly used manufacturing processes, machining is not yet the subject of predictive modeling. This is mainly due to the complexity of the thermo-mechanical and tribological interactions that are involved. In aeronautics, such a process is of particular interest since it is widely used to obtain most of the aluminum...

A constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate large strain deformation in hexagonal closed-packed metals that deform by slip and twinning. The model allows the twinned zones and the parent matrix to rotate independently. ZEK100 magnesium alloy sheets which significant texture weakening compared...

This paper proposes a novel method to design and manufacture skid-type landing gear cross tubes for light helicopter using Tube Hydroforming (THF). Hydroforming is a promising alternative to conventional fabrication methods, with the potential of reducing costs, weight and environmental footprint by reducing raw material consumption and chemical mi...

This paper proposes a novel method to design and manufacture skid-type landing gear cross tubes for light helicopter using Tube Hydroforming (THF). Hydroforming is a promising alternative to conventional fabrication methods, with the potential of reducing costs, weight and environmental footprint by reducing raw material consumption and chemical mi...

In this paper, a constitutive framework based on a rate-dependent crystal plasticity theory is employed to simulate the large strain deformation phenomena in hexagonal closed-packed (HCP) metals such as magnesium. The new framework is incorporated into in-house codes. Simulations are performed using the new crystal plasticity model in which crystal...

Endovascular stents have proven effective in treating coronary and peripheral arterial occlusions. Since the first attempts, metals used to make these devices have been generally selected, and designed to be highly resistant to corrosion. Therefore, as almost the totality of metallic biomaterials, they are implanted on a long-term basis. However, c...

In this paper, a new constitutive framework based on a ratedependent crystal plasticity theory is presented to simulate large strain deformation phenomena in HCP metals such as magnesium. In this new model the principal deformation mechanisms considered are crystallographic slip and deformation twinning. The new framework is incorporated into in-ho...

Les alliages de magnesium sont de plus en plus utilises dans l'industrie automobile. Leur faible masse volumique permet d'alleger les vehicules, donc de diminuer l'utilisation de carburant et les emissions de gaz a effet de serre. La ductilite du magnesium a temperature ambiante est faible, mais une augmentation de celle-ci permet l'activation de s...

The need for good mechanical properties of coronary stents so as to ensure the provision of strength to the artery walls is highlighted. The surface properties that are essential to stent performance include electrical charge, texture, and cleanliness. The desired mechanical properties include good radial strength and elastic modulus. The most prom...

Endovascular stents have proven effective in treating coronary and peripheral arterial occlusions. All metallic materials currently used to make these devices are considered to be corrosion-resistant, and are therefore implanted on a long-term basis. Complications, however, have often been reported, such as restenosis and thrombosis. To reduce the...

A modeling and simulation methodology based on ABAQUS software is presented for a multistage tube hydroforming (THF) process. Using adequate loading paths and appropriate numerical parameters, it is possible to avoid potential failures that are prone to occur under uncontrolled process. Two examples are considered. First, the failure mechanisms dur...

Three types of ABAQUS structural elements are tested and compared for their performance in tube bending and tube hydroforming (THF) simulations on Abaqus/CAE. The effects of prior bending process on the subsequent THF are also considered.