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1,014
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Introduction
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October 2018 - present
October 2015 - September 2018
September 2013 - September 2015
Publications
Publications (51)
Published online in September 2021. A super-layer deposition method is developed for 3D macroscopic finite element modeling of heat transfer at part scale during the powder bed fusion (PBF) process. The proposed super-layer strategy consists of the deposition of batches of several layers. The main consideration is to deal with the effective heating...
The mechanical behaviour of the nickel-based superalloy In718, as processed from laser powder bed fusion (L-PBF) additive manufacturing, is characterized at high temperature, from 800 to 1100°C. Samples built by L-PBF are submitted to sequences combining uniaxial tensile load at different prescribed velocities, and relaxation steps of different dur...
Invited plenary conference.
Simulation of thermohydraulics of LPBF at mesoscale (track scale).
Concurrent simulation of solid thermomechanics.
Identification of behavior law of metallic alloys in conditions of LPBF by inverse finite element modeling of tension/relaxation tests performed under resistive heating with IR and DIC imaging at high temper...
Invited plenary conference.
Concurrent solid and fluid mechanics simulation of L-PBF additive manufacturing.
Identification of metallic alloys at high temperature in conditions of additive manufacturing.
A 3d printing of a thin wall is achieved by a fused filament fabrication process. The influence of the printing velocities on the filament morphology is studied using optical microscopy. The strand morphology is approximated to different geometries and compared to experimental data. The oblong cross-section is a good approximation to estimate the s...
Purpose
The purpose of this paper is to find a theoretical reference to adjust the unsymmetrical arc shape and plasma flow of overlapping deposition in wire arc additive manufacturing (WAAM) and ensure the effect of the gas shielding and stable heat and mass transfer in deposition process. The multiphysical numerical simulation and physical experim...
Additive Manufacturing (AM) is widely used to manufacture complex and personalized medical components. However, the generation and manually removing of support structures in the pre- and post-processing stages are still time-consuming and costly. To improve the automation of preparation while reducing support structure volume, post-processing time...
A super-layer deposition technique is developed for 3D macroscopic finite element model to study heat exchange at part scale during the powder bed fusion (PBF) process. The level set method is used to track the interfaces between gas and the successive layers of powder bed and between the constructed part and non-exposed powder. To accelerate the s...
A thermo-mechanical analysis of powder bed fusion by laser beam is developed by the finite element method at the macro-scale. This approach focuses on the part construction, in which a level-set framework is adopted to track first the interface between the constructed part and the non-exposed powder, and second, the interface between gas and the su...
The thermo-mechanical analysis of powder bed fusion using laser beam is simulated in both meso-and macro-scales within a framework combining continuum assumption and level-set formulation. The meso-scale simulation focuses on laser interaction with the powder bed, and on subsequent melting and solidification. Modelling is conducted at the scale of...
To characterize the mechanical behaviour at high temperature close to the melting point,
a tensile test machine has been developed through resistive heating by Joule effect. A closed chamber is designed to control the working environment. By the two windows in the chamber, the temperature and displacement fields can be measured directly. For the m...
A 3D finite element model is developed to study heat exchange during metal selective laser melting (SLM). The approach is conducted on the scale of the part to be formed, using a level set framework to track the interface between the constructed workpiece and non-melted powder, and interface between the gas domain and the successive powder bed laye...
A 3D finite element model is developed to study heat exchange during the selective laser melting (SLM) process. The level set functions are used to track the interface between the constructed workpiece and non-melted powder, and interface between the gas domain and the successive powder bed layers In order to reach the simulation in macroscopic sca...
![Fig. 1. AFM phase images of interphase in c-APS/PP-PPm composites [7]....](profile/Ning-Wei-14/publication/319290153/figure/fig1/AS:637963734110209@1529113815721/AFM-phase-images-of-interphase-in-c-APS-PP-PPm-composites-7-The-dotted-lines-indicate_Q320.jpg)
An analytical solution on the interface debonding for large diameter carbon nanotube-reinforced composite with functionally graded variation interphase
The hyper-reduced-order model (HROM) is proposed for the thermal calculation with a constant moving thermal load. Firstly, the constant velocity transient process is simplified to a steady-state process in the moving frame. Secondly, the control volume is determined by the temperature rate, and the thermal equilibrium equation in the moving frame i...
Point grinding force theory model has been changed with the abrasive particle motion trail because of deflection angle α, which exists between the grinding wheel axis and workpiece axis. On the basis of traditional grinding force theory, the point grinding force theory model is built by using the point grinding model transformation and is verified...
![Work and tool material properties and contact conditions [32, 33, 34]...](profile/Tarek-Mabrouki/publication/277727522/figure/tbl1/AS:667599557910528@1536179546018/Work-and-tool-material-properties-and-contact-conditions-32-33-34-Materials_Q320.jpg)
Johnson-Cook constitutive model is still the most used model in metal cutting simulation, although several drawbacks reported in the literature. A high number of Johnson-Cook model parameters can be found in the literature for the same work material. One question that may arise is "What is the most suitable set of Johnson-Cook model parameters for...
The interface behavior between coated films, coated spheres and carbon nanotube (CNT)-reinforced composites governs their mechanical properties due to the large interface area per unit volume at these structures. Predicting the interface strength and debonding of these structures has been a challenge for decades. In this paper, a review of interfac...
This paper focuses on a 3D thermo-elasto-plastic localized thermal source simulation and its parametric analysis with high CPU efficiency in the reduced-order model (ROM) framework. The hyper reduced-order model (HROM) is introduced and improved with two choices. Firstly, three reduced bases are constructed: one for the displacement increments, one...
Load transfer of the graphene/carbon nanotube (CNT)/polyethylene hybrid nanocomposite is studied here from molecular dynamics (MD) simulations. Simulations of this composite material under uniaxial tension were conducted by varying CNT’s position and diameter in the polymer matrix. The obtained results show that: (1) The peak strength of stress and...
A three-dimensional (3D) analytical solution is derived for homogeneous
cylinder with the functionally graded variation interphase (FGVI) at the
inner surface. Based on the 3D solution, the dilute solution-based homoge-
neous model is adopted for the carbon nanotube (CNT)-reinforced nanocom-
posite considering FGVI and effective fibre modulus, in w...
A quasi-analytical solution on the minimum length and its corresponding system energy is proposed for the stable multi-layer folded graphene wrinkles (FGWs). The quasi-analytical solution shows that: (1) at a certain threshold height, a single-layer FGW becomes energetically favorable compared to a standing graphene wrinkle. (2) All the geometrical...
Finite element based models for cutting operation present outstanding complexities due to their nonlinear and multi-physics coupling. Nevertheless, there is no uniform standard for the comparison between cutting simulation models based on different software. The present work deals with various methodologies to simulate orthogonal cutting operation...
We apply united-atom (UA) nonequilibrium molecular dynamics simulations to predict the thermal conductivity for amorphous polyethylene at room temperature with chain length (CL) increasing from 4 to 1260. The thermal conductivity is determined by the competition of the two mechanisms: (1) The collision among the UA beads and (2) the phonon vibratio...
The interaction between the carbon nanotubes (CNT) and the polymer is a key factor for determining the mechanical, thermal, and electrical properties of the CNT/polymer nanocomposite. However, it is difficult to measure experimentally the interfacial bonding properties between the CNT and the surrounding polymer. Therefore, computational modeling i...
The influence of polymer wrapped two neighbouring single-walled nanotubes’ (SWNTs) dispersion on their load transfer is investigated by molecular dynamics (MD) simulations. The influence of the SWNTs’ position, the polymer chain length and the temperature on the interaction force between the two neighbouring SWNTs are systematically studied. There...
Modeling of metal cutting has proved to be particularly complex, especially for tool-chip interface. The present work is mainly
aimed to investigate the limiting shear stress at this interface in the case of Titanium alloy (Ti-6Al-4V) dry cutting based
on a FE-model. It is first shown that the surface limiting shear stress was linked to the contact...
A material microstructure-level (MML) cutting model based on the crystal plasticity theory is adopted for modelling the material removal by orthogonal cutting of the Titanium alloy Ti-6Al-4V. In this model, the grains are explicitly taken into account, and their orientation angles and slip system strength anisotropy are considered as the main sourc...
The objective of this study is to model material removal with cutting tool in the case of the machining of Titanium alloy (Ti-6Al-4V) and to bring a multi-physic comprehension of chip formation and the tool/workpiece interaction by adopting finite element approaches and methodologies. For that, the present contribution begins by a macroscopic model...
Modeling of metal cutting has proved to be particularly complex, especially for tool–chip interface. The present work is mainly aimed to investigate the limiting shear stress at this interface in the case of Titanium alloy (Ti–6Al–4V) dry cutting based on a FE-model. It was first shown that the surface limiting shear stress is linked to the contact...
Nowadays, numerical simulation of cutting processes receives considerable interest among the scientific and industrial communities. For that, various numerical codes are used. Nevertheless, there is no uniform standard for the comparison of simulation model with these different software. So, it is often not easy to state if a given code is more per...
Present work highlights the importance of material strain rate hardening characteristics as an influential factor in increasing material strength, as uncut chip thickness decreases from macro to micro-level dimensions during down-cut milling process. It has been found for a strain rate dependent material (A2024-T351) that rake face-chip contact len...
Present work highlights the importance of mate-rial strain rate hardening characteristics as an influential factor in increasing material strength, as uncut chip thick-ness decreases from macro to micro-level dimensions du-ring down-cut milling process. It has been found for a strain rate dependent material (A2024-T351) that rake face-chip contact...
It is important that preparing high quality grinding wheel to match Quick-point grinding processing. Using brazed CBN grinding wheel, grains can be combined with wheel matrix in high bonding strength, which is helpful to minimize wheel wear and to gain a good grinding ability. By establishing the connection between stress and its increment, the mec...
This study discussed several influencing factors on surface roughness and machining precision in quick-point grinding. It is found that the surface roughness influenced by wheel speed and grinding depth can be attributed to the changing of undeformed chip thickness. The ideal roughness can be obtained by reducing grinding inclined angle which reduc...
Technologies of remote screen sharing, remote control and network character intercommunion were adopted in this paper to construct a cooperative design system. The methods of developing cooperative plot system by the virtual network technology and constructing cooperative intercommunion system with web design language ASP and Access database were d...
Adopting the method of PIV, systematical theory analysis and experiment research were made on the airflow field distribution of super-high speed pectination grinding wheel, as well as experiment design and data acquisition, the data processing was carried out through the software of FlowMap, Tecplot, and Matlab. By analysis and discussion focused o...
Analysis and research methods on curved surface's prototyping error with FDM (Fused Deposition Modeling) process are introduced in this paper, then the experiment result of curved surface's prototyping error is analyzed, and the integrity of point cloud information and the fitting method of curved surface prototyping are discussed as well as the in...
Thick pre-stretched aluminum alloy plates are widely used in aircraft, while machining distortion caused by initial residual stress release in thick plates is a common and serious problem. To reduce the distortion, the residual stress distribution in thick plate must be measured. According to the characteristics of the thick pre-stretched aluminum...
To the processing requirements of high precision small dimension and high surface quality for internal spherical surface with through hole processing, a new technological method of precision turning was proposed in this paper, the processing equipment and control system were designed and developed, the parameters of precision turning technology wer...
The hard turning of AISI 4340 is taken as an example. First, thermo-mechanical coupled cutting model is set up with AbaqusExplicit software. Then, different friction coefficient for chip formation is studied for the reason of crack and heat softening. Additionally, another increased strain energy release rate is studied with different friction coef...
The thermo-mechanical coupled cutting model is made with Abaqus/Explicit software focused on the case of hard turning of 40CrNi2M. In order to stop heat dissipation affecting the model, for the machined workpiece, a zero conductivity value of the machined material is adopted. With the cutting model, a parametric study is proposed of the fraction of...
Engineering ceramic materials are difficult to machining because of their outstanding properties, such as high hardness, high wear resistance, high brittleness etc. Showing the characteristic of grinding technology of engineering ceramics, particularly, forcing process of impressing rupture dynamics model. Analysis the effect of grinding parameter...
The investigation of the experiment method on airflow field around super-high grinding wheel by PIV (Particle Image of Velocity, PIV) instrument was introduced in the paper. The measure system and scheme were designed for the experiment with PTV applied in the super-high speed grinding wheel for the airflow. The processing method of experimental da...
Questions
Question (1)
I saw several papers give the dislocation density in their MD simulation results, but the detailed information is not given, could you give me some ideas?
Projects
Projects (3)
Development of a specific machine named "Dedimet" with following characteristic features:
- resistive heating (Joule effect)
- field measurement of temperature by bichromatic infra-red (IR) camera
- field measurement of displacement by digital image correlation (DIC)
- successive tensile/relaxation solicitations
Associated identification of behavior models and their parameters through inverse finite element modeling of such mechanical tests
1. Numerical modelling at small scale (track scale):
- Prediction of thermo-hydraulics in molten pools, track shape, temperature and stress field in tracks and their vicinity, solidification structures
- Study of the influence of process parameters: power and velocity of energy source, layer thickness and hatch distance in LBM, material deposition parameters in WAAM...
2. Numerical modelling at large scale (part scale):
- Prediction of temperature distribution, solid thermo-mechanics (stress and distortion during and after the part construction - residual stress)
- Study of the influence of process parameters
