Achraf Kallel

@article{kadri_3073,

title = {Study of composite polymer degradation for high pressure hydrogen vessel by machine learning approach},

author = {Kheireddine Kadri and Achraf Kallel and Guillaume Guérard and Abir Ben Abdallah and Joseph Fitoussi and Sebastien Ballut and Mohammadali Shirinbayani},

url = {https://doi.org/10.1002/est2.645},

year  = {2024},

date = {2024-06-01},

journal = {Energy Storage},

volume = {6},

number = {4},

pages = {e645},

abstract = {The aim of this paper is to study the degradation of a composite material under static pressure. The high pressure condition is similar to the one encountered inside hydrogen  tanks. Damage modeling was used to evaluate the behavior of hydrogen tanks to high pressure. A practical approach, coupling a finite element method (FEM) simulation and machine learning algorithm (ML), is suggested. The representative volume element (RVE) was used in association with a choice of a behavior law and a damage law as an input data. Algorithms for ML classification such as K-nearest neighbors (k-NN) and a special k-NN with a dynamic time warping (DTW) metric were used. The hierarchical clustering through dendrograms visualizations allowed to exhibit the impact of composite parameters in relation to fiber, matrix properties and  fiber volume fraction on the strain degradation under external static pressure. Continuing this, the optimum RVE which shows a low degradation value will be exhibited.},

note = {Scimagojr Q3 en Energy},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{barhoumi_2861,

title = {Numerical Study of Doxorubicin transdermal delivery for breast cancer treatment using Microneedles},

author = {Houda BARHOUMI and Marie Carole Kouassi and Achraf Kallel},

url = {https://onlinelibrary.wiley.com/doi/10.1002/cnm.3812},

year  = {2024},

date = {2024-05-01},

journal = {International Journal For Numerical Methods In Biomedical Engineering},

volume = {40},

number = {5},

pages = {e3812},

abstract = {The lack of in vivo studies on the delivery of doxorubicin within human skin,

especially the absence of data on the doxorubicin diffusion coefficient, has

made understanding its transdermal delivery kinetics challenging. In this

study, as a first step, governing equations and finite element methods were

employed to reproduce Franz diffusion cell experiment in human cadaver skin.

The application of this experiment representative model with a fitting method

resulted in approximate values for the diffusivity of doxorubicin across various

skin layers. The estimated values were used later to conduct a comprehensive

examination of doxorubicin administration for breast tumor treatments. In a

2D axisymmetric model using Fick's Law and then a microneedles array 3D

model, crucial parameters effects on delivery efficiency were examined, such

as the microneedle tip diameter, tip-to-tip distance, and tumor depth. As

highlighted by the findings of this study, these parameters have an impact on

the effectiveness of doxorubicin delivery for treating breast tumors. The focus

of this research is on the potential of numerical methods in biomedical engineering,

which addresses the urgent need for data on doxorubicin diffusion in

human skin and offers valuable insights into optimizing drug delivery strategies

for enhanced therapeutic outcomes.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{fitoussi_2701,

title = {Investigation of manufacturing process effects on microstructure and fatigue prediction in composite automotive tailgate design},

author = {Joseph Fitoussi and Samia Nouira and Khaled Benfriha and Mohamed Amine Laribi and Achraf Kallel and Robert Tie Bi and Mohammadali Shirinbayani},

url = {https://trebuchet.public.springernature.app/get_content/0b23264d-b090-4fd4-8009-ed9d9111d672?utm_source=rct_congratemailt&utm_medium=email&utm_campaign=nonoa_20240116&utm_content=10.1007/s00170-024-12988-z},

year  = {2024},

date = {2024-01-01},

journal = {International Journal Of Advanced Manufacturing Technology},

volume = {130},

number = {7},

pages = {4295-4310},

abstract = {Manufacturing processes signifcantly infuence microstructural variations in short fber reinforced composites, which afect

damage characteristics and fatigue life. Accurate fatigue life prediction is critical, especially when considering the impact

of these manufacturing induced microstructural nuances. In this study, we investigate how manufacturing processes shape

microstructures and their impact on fatigue life prediction. We present an advanced micromechanical model for predicting

fatigue life in tangible structures, considering the microstructure distribution infuenced by manufacturing dynamics. Our

model links damage from monotonic loading to fatigue life, resulting in a multi-scale fatigue prediction model. This approach

builds a database revealing the interaction between Tsai-Wu failure criterion parameters, manufacturing-induced microstructural variations, and target fatigue life. Using these insights, we fne-tune material properties in fnite element simulations for

precise design optimization. We illustrate our method using an automotive tailgate made from a sheet molding compound.

This research highlights the critical role of manufacturing processes in microstructure variation and fatigue life prediction.

It ofers the potential for signifcant vehicle weight reduction, energy savings, and reduced emissions in automotive design

and promises to be a valuable tool for optimizing manufacturing process parameters.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{shirinbayani_2367,

title = {Manufacturing Process Effect on the Mechanical Properties of Glass Fiber/Polypropylene Composite Under High Strain Rate Loading: Woven (W?GF?PP) and Compressed GF50?PP},

author = {Mohammadali Shirinbayani and Abbasnezhad Navideh and Mohammad Hossein Nikooharf and Khaled Benfriha and Achraf Kallel and Jendli Zouhaier and Joseph Fitoussi},

url = {https://link.springer.com/article/10.1007/s10443-023-10143-7},

year  = {2023},

date = {2023-12-01},

journal = {Applied Composite Materials},

volume = {30},

pages = {1717-1736},

abstract = {Long glass fiber thermoplastic laminates have garnered significant attention for their potential use in designing structural parts across various sectors, including automotive, aerospace, and petroleum. The growing demand for lightweight and reliable materials in hydrogen vessel reservoirs, intended for future vehicles, necessitates understanding the fast dynamic behavior (crash) of these materials for effective structural design in such applications.

This study presents an optimized approach for experimentally characterizing the overall dynamic mechanical behavior of Twill woven glass fiber reinforced polypropylene (W-GF-PP) laminates. The methodology focuses on reporting the strain rate effect on the

material response while attempting to isolate the inherent inertial disturbances in the specimen attributed to the test system. Tensile tests have been conducted until the specimen's total failure for three specific relative orientations of fiber: 0°, 90°, and ± 45°. The tests

span a strain rate range from quasi-static (10-4 s?1) up to 2000 mm?s?1 (approximately 160 s?1, depending on the specimen's actual response). The material's behavior appears sensitive, particularly for the ± 45° fiber orientation. The study also examines the impact of

the manufacturing process type on the dynamic behavior of the reinforced polypropylene.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{fitoussi_1864,

title = {Mechanical Properties and Damage Behavior of Polypropylene Composite (GF50-PP) Plate Fabricated by Thermocompression Process Under High Strain Rate Loading at Room and Cryogenic Temperatures},

author = {Joseph Fitoussi and Mohammad Hossein Nikooharf and Achraf Kallel and Mohammadali Shirinbayani},

url = {https://link.springer.com/article/10.1007/s10443-022-10047-y},

year  = {2022},

date = {2022-07-01},

journal = {Applied Composite Materials},

volume = {29},

number = {3},

pages = {1-21},

abstract = {This paper concerns the coupling effect of strain rate and temperature on the damage mechanical properties of the long-glass-fiber-reinforced polypropylene (GF50-PP) composite produced by the thermocompression process. Composite plates of GF50-PP have been employed to study the effect of glass fiber distribution on the mechanical properties of the composites. To achieve this objective the tensile tests have been performed at strain rate range from quasi-static to 100 s?1 at two loading temperatures of 20 °C and -70 °C, while measuring the local deformation through a contactless technique using a high-speed camera. High strain rate tensile tests findings showed that GF50-PP behavior is strongly strain-rate dependent. For instance, the stress damage threshold for three fiber orientations of 0°, 45°, and 90° to the Mold Flow Direction (MFD) was increased, when the strain rate varies from quasi-static (0.001 s?1) to 100 s?1 at two loading temperatures of 20 °C and -70 °C. The experimental methodology was coupled to microscopic observations using SEM to study the damage mechanisms of GF50-PP. The analysis confirms that there are three damage mechanisms: fiber-matrix interface debonding, matrix breakage, and pseudo-delamination between neighboring bundles of fibers.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ben_abdallah_1721,

title = {Modeling of viscoelastic behavior of a shape memory polymer blend},

author = {Abir Ben Abdallah and Achraf Kallel and Abbas Tcharkhtchi and Tarek Hassine and Fehmi Gamaoun},

url = {https://onlinelibrary.wiley.com/doi/10.1002/app.51859},

year  = {2022},

date = {2022-05-01},

journal = {Journal Of Applied Polymer Science},

volume = {139},

number = {13},

pages = {51859},

abstract = {Shape memory effect (SME) of polymers is a property that concerns both,

macroscopic and microscopic changes. The variation of internal polymer

properties such, as molecular weight (Mw), rigidity, and viscoelasticity could

alter its SME. In this study, a bi-parabolic model with six parameters is used to

describe the viscoelastic behavior of a shape memory polymer (SMP) blend

(40% poly(caprolactone), PCL/60% Styrene-Butadiene-Styrene) with different

PCL Mw. These parameters are determined using the Cole-Cole method.

Modeling curves (E00 = f (E0)) will be then compared to experimental data from

dynamical mechanical analysis (DMA) tests. It is shown that the bi-parabolic

model predicts well the behavior of the SMP mixture for different Mw of PCL.

Afterwards, the evolution of the model parameters with the Mw of PCL is

investigated. It is revealed that, when Mw of PCL drops, the relaxation modulus

E0 increases. This result proves that the rigidity of the SMP blend rises with

Mw declines.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kallel_1585,

title = {Driving force for shape memory effect of polymers},

author = {Achraf Kallel and Abir Ben Abdallah and Fehmi Gamaoun and Abbas Tcharkhtchi and Hachmi BenDaly and Joseph Fitoussi},

url = {https://link.springer.com/article/10.1007/s10965-021-02637-4},

year  = {2021},

date = {2021-07-01},

journal = {Journal Of Polymer Research},

volume = {28},

number = {10},

pages = {308},

abstract = {In this study, we aim to evaluate the shape memory effect of a Poly (Caprolactone) (PCL) (40%) and a Styrene-Butadiene-Styrene (SBS) (60%) blend. Shape memory cycle tests are performed at different temperatures to detect the best recovery rate. Under appropriate temperature, the blend recovers substantially its original shape. To study the recovery rate evolution, multi cycle tests are realized with controlled temperature. The results indicate that the shape memory effect growths when the number of cycle increases. The stored energy acts as a driving force to bring the polymer to its permanent shape after each loading cycle. Then, an original method is proposed to measure the stress-strain evolution during the recovery. With a variable temperature, no standard test can follow the stress-strain evolution. This test is needed to validate the behavior model.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ben_abdallah_1269,

title = {Molecular weight influence on shape memory effect of shape memory polymer blend ( poly(caprolactone)/styrene-butadiene-styrene )},

author = {Abir Ben Abdallah and Fehmi Gamaoun and Achraf Kallel and Abbas Tcharkhtchi},

url = {https://onlinelibrary.wiley.com/doi/10.1002/app.49761},

year  = {2021},

date = {2021-02-01},

journal = {Journal Of Applied Polymer Science},

volume = {138},

number = {5},

pages = {49761},

abstract = {The shape memory effect (SME) does not only concern the macroscopic structure. It concerns also the polymer structure at morphological, macromolecular, and molecular scales. This effect may depend on different physicochemical properties like morphology heterogeneity, chain rigidity, steric hindrance, chain polarity, free volume, cross-linking or entanglement density, molecular shape and weight, and so on. Hence, finding the relationship between the SME and these properties is very important. This can help to obtain the knowledge about the phenomenon origin and mechanism. One of the basic polymer properties, which can have direct SME, may be the molecular weight (Mw). The question here is: If the Mw of a shape memory polymer (SMP) changes, for different reasons like degradation, what will be the effect of this change on its SME. In order to answer to this question, the investigation is focused on an SMP blend of 40% poly(?-caprolactone) (PCL) and 60% styrene-butadiene-styrene (SBS). Then, enzymatic hydrolysis is performed on this blend to change its Mw. It is shown that this change is only related to the variation in the Mw of PCL. After that, different samples with a distinct average Mw are prepared and characterized by various experimental methods. Shape memory tests are performed on these blends, and the recovery rate (Rr) for each of them is determined. It is found that when Mw of PCL decreases, its degree of crystallinity, its glass transition, and its melting temperatures, corresponding to the PCL phase, increase. However, the elongation at break of the blend declines with the reduction in Mw. The tests show that the alteration in the blend's Mw influences its SME. Indeed, Rr of the (PCL/SBS) mixture drops with the decrease in Mw of PCL.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{ben_abdallah_992,

title = {Enzymatic Hydrolysis of Poly (Caprolactone) and its Blend with Styrene-Butadiene-Styrene (40% PCL/60% SBS)},

author = {Abir Ben Abdallah and Achraf Kallel and Fehmi Gamaoun and Abbas Tcharkhtchi},

url = {https://link.springer.com/article/10.1007%2Fs10924-019-01522-y},

year  = {2019},

date = {2019-11-01},

journal = {Journal Of Polymers And The Environment},

volume = {27},

pages = {2341-2351},

abstract = {In this study, we aim to evaluate the effect of enzymatic hydrolysis on aliphatic polyester and on its shape memory blend. Therefore, the hydrolysis of poly (?-caprolactone) (PCL) and of its shape memory polymer (SMP) blend [40% PCL/60% styrene-butadiene-styrene (SBS)] in a solution containing an Amano lipase from pseudomonas fluorescence and a phosphate buffered saline (PBS), is achieved. An appropriate characterization helps to better understand the behaviour of these polymers. So, the properties of these materials prior and after hydrolytic degradation are investigated. When they are submitted to enzymatic hydrolysis, the physico-chemical and mechanical properties of PCL and its blend (PCL/SBS) change. PCL undergoes a significant decrease in weight during enzymatic hydrolysis. Yet, blending PCL with SBS considerably reduces its degradation rate in terms of weight drop, compared with pure PCL. The enzymatic hydrolysis causes chains splitting, which rises their mobility and facilitates their reorientation. Consequently, for PCL and its blend, the degree of crystallinity Xc rises during hydrolytic degradation, which confirms that the amorphous regions of PCL are more susceptible to hydrolysis. Besides, this continuous rise in crystallinity causes the augmentation of PCL and its blend melting, crystallization and glass transition temperatures. Moreover, the PCL brittleness increases, and the blend ductility decreases with the enzymatic hydrolysis time. For both, PCL and its blend, the young modulus displays two opposite effects; it goes up due the growth of crystallinity, but at the end of hydrolysis, its value goes down because of weight loss.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}

@article{kallel_891,

title = {Study of bonding formation between the filaments of PLA in FFF process},

author = {Achraf Kallel and Imade Koutiri and Elham Babaeitorkamani and Alireza Khavandi and Morteza Tamizifar and Mohammadali Shirinbayani and Abbas Tcharkhtchi},

url = {https://www.hanser-elibrary.com/doi/10.3139/217.3718},

year  = {2019},

date = {2019-08-01},

journal = {International Polymer Processing},

volume = {34},

number = {4},

pages = {434-444},

abstract = {Fused filament fabrication (FFF) is an additive manufacturing (AM) process that provides physical objects commonly used for modeling, prototyping and production application. The major drawback of this process is poor mechanical property due to the porous structure of final parts. This process requires careful management of coalescence phenomenon. In this paper, the major influencing factors during the FFF process of poly(lactic acid) (PLA) were investigated experimentally and with a numerical model. It has been shown that the polymer temperature has a significant effect on rheological behavior of PLA especially on adhesion of the filaments. An experimental set-up has been placed in the machine to have the cyclic temperature of the filament. A variation of the polymer temperature influences process parameters such as feed rate, temperature of nozzle and temperature of the platform. The results showed that the amount of polymeric coalescence (neck growth) rises when increasing the feed rate, the nozzle temperature, and the platform temperature. A model to predict the neck growth is proposed. It predicts a lower amount of neck growth value than obtained with experimentally. This difference has been explained as the effect of other phenomena, such as polymer relaxation time, pressure of the nozzle and especially cyclic temperature which is not taken into account in the model.},

keywords = {},

pubstate = {published},

tppubtype = {article}

}