
Sana KoubaaNational Engineering School of Sfax | ENIS · Mechanical Engineering Department
Sana Koubaa
Assistant Professor -ENIS- University of SFAX
About
41
Publications
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Introduction
Sana Koubaa currently works at the Mechanical Engineering Department, Ecole Nationale d'Ingénieurs de Sfax. Sana does research in Manufacturing Engineering, Mechanical and Materials Engineering.
Publications
Publications (41)
In the present study, polyamide 6 reinforced with 30 wt% Glass fiber (PA6/GF30) used in automotive industry was reprocessed via injection molding. The virgin and recycled PA6/GF30 samples were characterized by chemical, rheological, mechanical, and morphological properties as a function of the number of processing cycles. After each reprocessing cy...
Cracking is the primary damage and failure mechanism for most brittle materials. The development of numerical simulation tools of failure phenomena has become necessary to evaluate the risk of initiation and propagation of defects in structures. Phase field approaches are one of the most promising ways to analyze the crack behavior of such material...
In additive manufacturing (AM) process, zero defect target is essential in industry. Before the component is completed, corrective actions are required to be performed. To this end, the integration and the development of non-destructive techniques and methods are of great interest. In this study, the part to be printed was designed via Solid Works...
In this work, we investigate the effect of the Posidonia Oceanica fiber (POF)
rate and matrix type on the mechanical properties and water absorption
behavior of the produced composites by compression molding process. The
obtained results show that the stiffness, strength and hardness of unsaturated
polyester resin (UPR)/POF composite increase with...
Hole-flanging process is widely being used in metal forming industry. Using elastomeric punch instead of the rigid one may enhance the quality of surface finish of the produced part. The objective of this paper is to investigate the sheet metal hole-flanging process with soft punch. This investigation is carried out via numerical and experimental a...
Rubber materials are increasingly used in automotive and aircraft manufacturers companies because their advantages in terms of corrosion resistance, vibration isolation and impact. These materials exhibit the proprieties of hyperelastic and viscoelastic materials where their mechanical proprieties depend on time variation, when subjected to mechani...
A computational model is developed to analyze the geometrically nonlinear response of porous functionally graded shells when subjected to various mechanical loadings and boundary conditions. This mathematical modeling is based on High-Order-Shear Deformation Theory (HSDT) using double directors vectors. The material properties are supposed to vary...
The main objective of this paper is to develop a numerical model susceptible to solve the numerical locking problems that may appear when applying the conventional solid and shell finite elements of ABAQUS. This model is based on a hexahedral solid shell element. The formulation of this element relays on the combination of the enhanced assumed stra...
This study is focusing on the finite element simulation of low velocity impact applied to glass fiber-reinforced composites. Elasto-visco-plasticity is adopted taking into account strain rate effect, with isotropic hardening. To avoid numerical locking, hexahedral solid shell finite element SS is developed. The formulation is based on the mixed Ass...
The objective of the present paper is to predict numerically the effect of low velocity impact on the composite epoxy reinforced with quasi-unidirectional flax fabrics. The composite circular plate is meshed with a solid shell finite element (SS). Only one element in the thickness direction is adopted. This SS element is implemented into the user e...
In the plastic industry, scrap is common and can reach important
amounts in some applications. For that reason, reprocessing in the format of
mechanical recycling is pretty common among plastic industry for its simplicity
and efficiency. However, the stated type of reprocessing causes the degradation
of the proprieties of plastic. Hence, recycled p...
Due to their crystallographic texture, sheet metals generally present a significant anisotropy. The DD13 sheet metal is one of the hot-rolling steels, also called mild steels that is designed for deep and extra deep drawing applications. It is characterized by high fracture elongation and suitable for chassis components and wheel outer borders. A f...
In this study, numerical analysis of the static bending response of FGM is carried out with different combinaisons of geometries, boundary conditions and mechanical loading. The material properties according to the coordinates of the integration points are defined using the UMAT subroutines in ABAQUS software. The FSDT is used for thin and moderate...
Deep drawing process is commonly used to produce particular components like aerospace and automotive structural parts. Based on the drawing ratio, it can be performed in a single or a multiple-stage drawing. Due the complexity of this process, finite element simulations are considered as a powerful tool for the both reasons: reducing times and cost...
The main objective of this work is to develop an hexahedral solid
shell finite element in order to resolve the numerical locking effects that may
have occurred when employing the conventional solid and shell finite elements.
The developed formulation relay on the coupling between the Assumed Natural
Strain (ANS) and Enhanced Assumed Strain (EAS) me...
The purpose of this manuscript is to carry out an experimental and numerical investigation of bulging process of aluminum AA1050-H14 sheet metal in free expansion when using a flexible punch. Three types of rubber with different hardness are used
as flexible punch. First, a mechanical characterization and identification of aluminum sheet metal and...
Numerical analysis of the static bending and free vibration mechanical behavior of FGM are performed using the UMAT-USDFLD subroutines in ABAQUS software. Different combinations of geometries, mechanical loading and boundary conditions are adopted. The material properties according to the coordinates of the integration points are defined in the dev...
Numerical analysis of the static bending and free vibration mechanical behavior of FGM are performed using the UMAT-USDFLD subroutines in ABAQUS software. Different combinations of geometries, mechanical loading and boundary conditions are adopted. The material properties according to the coordinates of the integration points are defined in the dev...
This paper presents an implementation of a fully coupled non-associated anisotropic plasticity-ductile damage model, including a mixed nonlinear isotropic- kinematic hardening. With the non-associated anisotropic plasticity assumption, the yielding and plastic potential are determined independently. The quadratic Hill’48 function is considered for...
In this paper, the formulation of the finite element method for vibro-acoustic problem is applied to a vehicle to investigate the sound pressure level inside the cabin. This study is combined with a stochastic analysis to account for variability of different parameters, considered as random variables, which are related to the characteristics of mat...
In this work, the finite element simulation is applied in the solution of acoustic problems when the geometric and material properties present uncertainty. In this case, the probabilistic nature of physical parameters is considered in analytical model, and their influence on the pressure field is discussed. Results using the polynomial chaos expans...
In this paper, an improved anisotropic elasto-plastic model strongly coupled with isotropic ductile damage is investigated. The quadratic Hill’48 yield criterion and non-linear isotropic/kinematic hardening are considered in the associated flow rule model. The numerical formulation of the proposed model is implemented in ABAQUS finite element code...
Flexible forming with rubber pad is a forming technique that is commonly used in the aeronautic and automotive industries to produce parts with complex shapes from thin sheet metal. The purpose of this chapter is to compare between using flexible punch or flexible die in sheet metal forming with rubber pad. A finite element simulation is carried ou...
The purpose of this paper is to study numerically the “elastomer-assisted compression beading” (EACB process). It consists of conventional compressing beading after a local bulging carried out by an elastomer material. A Finite Element Method (FEM) is introduced to predict where and when the damage can occur in the tube and to study the effects of...
In this work, an analytical formulation and numerical implementation of the response of the coupled structure-acoustic system were performed. The acoustic pressure inside the cavity as well as the plate displacement are analyzed. This study is combined with a probabilistic analysis to account for variability of different parameters, considered as r...
A finite element simulation of flexible bulge forming of aluminum sheet metal is carried out. The effect of rubber pad on forming capability is studied by comparing flexible bulge to hydroforming. Based on the theory of Continuum Damage Mechanics (CDM), a local approach with fully coupling between ductile damage and an anisotropic elasto-plastic mo...
In this paper, a geometrically nonlinear analysis of functionally graded material (FGM) shells is investigated using Abaqus software. A user defined subroutine (UMAT) is developed and implemented in Abaqus/Standard to study the FG shells in large displacements and rotations. The material properties are introduced according to the integration points...
This paper deals with the implementation of an anisotropic plasticity constitutive equations exhibiting non-linear isotropic, kinematic hardening and coupled continuum ductile damage models. A fully implicit integration of the coupling constitutive equations is adopted and leads to two non-linear local scalar equations solved using the Newton metho...
A finite element implementation of an anisotropic plasticity model for aluminum AA5754-O in impact simulations was performed, particularly for the case of perforation on low velocity (up to about 25 m/s). The elasto-viscoplastic model includes isotropic elasticity, anisotropic yielding, associated plastic flow and mixed non-linear isotropic/kinemat...
A numerical investigation was carried out to analyze in details the perforation process of target AA5754-O Aluminum plate when subjected to normal impact at low (up to ) and moderate velocities (ranged between ). A fully coupled elasto-visco-plastic-damage model is implemented into a user-defined material (VUMAT) subroutine for the commercial finit...
Rubber forming is a sheet metal forming process using flexible punch or die. In this paper,
finite element method is introduced to analyze rubber-pad forming process of aluminum sheet
metal. An elasto-plastic constitutive model with J2 yield criterion and mixed non-linear
isotropic/kinematic hardening coupled with Lemaitre’s ductile damage has been...
Cyclic stresses applied to bones generate fatigue damage that affects the bone stiffness and its elastic modulus. This paper proposes a finite element model for the prediction of fatigue damage accumulation and failure in cancellous bone at continuum scale. The model is based on continuum damage mechanics and incorporates crack closure effects in c...
In thermoplastic pultrusion process, unidirectional glass fibre bundles are very often used as reinforcement. This study was motivated by the industrial requirement to evolve from low viscosity thermoset resin processes to high viscosity thermoplastic polymers. The key parameters to control the impregnation process are the permeability of the fibro...
Pultrusion is a crucial method for continuous production of fiber-reinforced composites. It was developed several years ago for thermosetting polymer matrices, but the challenge is now to extend it to thermoplastic matrices, with a much higher viscosity. In this paper, we propose an analysis of the parameters influencing fiber impregnation in the c...
Pultrusion is a continuous process with application in the manufacture of fibre-reinforced composites. This work reports the impregnation process which is one of the major concerns in pultrusion. We set out to develop a model that describes the flow advancement for a thermoplastic matrix when the reinforcements pass through the die. Therefore, the...
Tensile dynamic tests are essential experiments to develop and validate constitutive equations. In this paper, we studied the errors on stress and strain measurement in dynamic tensile tests by using finite-element analysis. Two strain and one stress measures were discussed. Mainly, we considered the influence of the material and multiple geometric...