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Marouene Zouaoui
Institut Charles Delaunay, LASMIS, UTT, UMR CNRS 6281, 12 rue Marie Curie, 10010 Troyes, France

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Journal article
Published: 30 May 2021 in Applied Sciences
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In this paper, a numerical method is proposed to simulate the mechanical behavior of a new polymeric pre-structured material manufactured by fused filament fabrication (FFF), where the filaments are oriented along the principal stress directions. The model implements optimized filament orientations, obtained from the G code by assigning materials references in mesh elements. The Gauss points are later configured with the physical behavior while considering a homogeneous solid structure. The objective of this study is to identify the elastoplastic behavior. Therefore, tensile tests were conducted with different filament orientations. The results show that using appropriate material constants is efficient in describing the built anisotropy and incorporating the air gap volume fraction. The suggested method is proved very efficient in implementing multiplex G code orientations. The elastic behavior of the pre-structured material is quasi-isotropic. However, the anisotropy was observed at the yield point and the ultimate stress. Using the Hill criterion coupled with an experimental tabular law of the plastic flow turns out to be suitable for predicting the response of various specimens.

ACS Style

Marouene Zouaoui; Julien Gardan; Pascal Lafon; Ali Makke; Carl Labergere; Naman Recho. A Finite Element Method to Predict the Mechanical Behavior of a Pre-Structured Material Manufactured by Fused Filament Fabrication in 3D Printing. Applied Sciences 2021, 11, 5075 .

AMA Style

Marouene Zouaoui, Julien Gardan, Pascal Lafon, Ali Makke, Carl Labergere, Naman Recho. A Finite Element Method to Predict the Mechanical Behavior of a Pre-Structured Material Manufactured by Fused Filament Fabrication in 3D Printing. Applied Sciences. 2021; 11 (11):5075.

Chicago/Turabian Style

Marouene Zouaoui; Julien Gardan; Pascal Lafon; Ali Makke; Carl Labergere; Naman Recho. 2021. "A Finite Element Method to Predict the Mechanical Behavior of a Pre-Structured Material Manufactured by Fused Filament Fabrication in 3D Printing." Applied Sciences 11, no. 11: 5075.

Original contribution
Published: 15 February 2021 in Fatigue & Fracture of Engineering Materials & Structures
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This paper presents and compares two combined experimental‐numerical techniques for the investigation of fracture properties of additively manufactured polymer parts using digital image correlation (DIC) measurements. The first method only uses measured kinematic fields, and the second is based on finite element simulations driven by measured boundary conditions. A mini single edge notched tensile sample manufactured by fused filament fabrication with ABS is studied. It is shown that both methods locally extract J‐integrals, and the crack tip is accurately located by the FE‐based method. By comparing computed displacements to those measured via DIC, it is possible to locally check the validity of the numerical model. The initiation and propagation stages are analyzed independently thanks to two different magnifications of acquired image series.

ACS Style

Mohamed Ali Bouaziz; Joseph Marae‐Djouda; Marouene Zouaoui; Julien Gardan; François Hild. Crack growth measurement and J ‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling. Fatigue & Fracture of Engineering Materials & Structures 2021, 44, 1318 -1335.

AMA Style

Mohamed Ali Bouaziz, Joseph Marae‐Djouda, Marouene Zouaoui, Julien Gardan, François Hild. Crack growth measurement and J ‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling. Fatigue & Fracture of Engineering Materials & Structures. 2021; 44 (5):1318-1335.

Chicago/Turabian Style

Mohamed Ali Bouaziz; Joseph Marae‐Djouda; Marouene Zouaoui; Julien Gardan; François Hild. 2021. "Crack growth measurement and J ‐integral evaluation of additively manufactured polymer using digital image correlation and FE modeling." Fatigue & Fracture of Engineering Materials & Structures 44, no. 5: 1318-1335.

Journal article
Published: 01 December 2020 in Procedia Structural Integrity
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This work aims to develop an advanced structured material [1] that enhances the physical properties in the fracture mechanics area with specimens printed by FDM. 3D printed parts are considered as complex structures and assumed to show a strong anisotropy related to deposition trajectories, air gaps, and welding lines. Therefore, a challenging problem that arises in this domain is the difficulty of predicting the mechanical behavior and controlling the physic properties of parts (tensile strength and fracture toughness…). An extrusion deposition method was proposed involving the use of a controlled deposition method to improve the fracture toughness of FDM parts [2], [3].The enhancement is based on a filament deposition optimization in order to reproduce principal stresses directions in a region of interest submitted to crack initiation around the notch tip. The overall goal of this research is to identify material constants from experimental tests. Those constants will be used then as inputs of a finite element model, which tackles to include the structural anisotropy by assigning materials references into local mesh elements [4]. Thus, the corresponding behavior was assumed to be transverse isotropic and five elastic materials constants must be identified. Hence, a set of tensile tests was performed with full-field measurements by Digital Image Correlation (DIC) for different filament orientations. Regions of interests were chosen according to the local loading state to activate specific materials constants. The experiments outcomes prove that 3D printed specimens have unexpectedly isotropic stiffness due to similar values found of longitudinal and transversal Young’s modulus 1680 MPa and 1414 MPa respectively. Although anisotropy is well highlighted when we consider tensile strength. On the light of these results, the model will be enriched by implementing a Hill yield criterion to better represent the observed plastic anisotropic behavior. The main contribution is to validate the numerical model inputs that reproduce the measured experimental fields, and later on develop an identification based on an Updated Finite Element Model Updated (UFEM).

ACS Style

Marouene Zouaoui; Julien Gardan; Pascal Lafon; Carl Labergere; Ali Makke; Naman Recho. Transverse Isotropic Behavior Identification using Digital Image Correlation of a Pre-structured Material Manufactured by 3D Printing. Procedia Structural Integrity 2020, 28, 978 -985.

AMA Style

Marouene Zouaoui, Julien Gardan, Pascal Lafon, Carl Labergere, Ali Makke, Naman Recho. Transverse Isotropic Behavior Identification using Digital Image Correlation of a Pre-structured Material Manufactured by 3D Printing. Procedia Structural Integrity. 2020; 28 ():978-985.

Chicago/Turabian Style

Marouene Zouaoui; Julien Gardan; Pascal Lafon; Carl Labergere; Ali Makke; Naman Recho. 2020. "Transverse Isotropic Behavior Identification using Digital Image Correlation of a Pre-structured Material Manufactured by 3D Printing." Procedia Structural Integrity 28, no. : 978-985.

Journal article
Published: 13 December 2019 in Frattura ed Integrità Strutturale
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Additive manufacturing (AM) is a promising way to produce complex structures by adding layers. It arises great interest both in industrial and academic sectors to develop new advanced structured material. To benefit from its advantages, it is important to accurately characterize the obtained structures in order to ensure their integrity during operation. It becomes then important to characterize these structures at the local scale (micron and/or the nanometer scale). In the specific case of polymeric materials obtained by Fused Deposition Modeling (FDM), the comprehension of the mechanical behavior between adjacent layers during deformation can help improving mechanical properties. However, few studies in the literature have focused on implementing approaches to characterize local strains at the surface of these materials. In this study, an original approach based on the use of speckle pattern with particle average size of 20 microns in diameter was coupled to digital image correlation (DIC). It has been applied to the case of a SENT structure with a notch made by FDM. The successive images recorded by a digital microscope allow a qualitative analysis of the evolutions of the local strains. The kinematic fields are obtained by DIC. The strain evolutions at the tip of the notch are highlighted. The deformation mechanisms at the local scale are confronted with macroscopic behavior of the structure.

ACS Style

Joseph Marae Djouda; Donato Gallittelli; Marouene Zouaoui; Ali Makke; Julien Gardan; Naman Recho; Jérôme Crépin. Local scale fracture characterization of an advanced structured material manufactured by fused deposition modeling in 3D printing. Frattura ed Integrità Strutturale 2019, 14, 534 -540.

AMA Style

Joseph Marae Djouda, Donato Gallittelli, Marouene Zouaoui, Ali Makke, Julien Gardan, Naman Recho, Jérôme Crépin. Local scale fracture characterization of an advanced structured material manufactured by fused deposition modeling in 3D printing. Frattura ed Integrità Strutturale. 2019; 14 (51):534-540.

Chicago/Turabian Style

Joseph Marae Djouda; Donato Gallittelli; Marouene Zouaoui; Ali Makke; Julien Gardan; Naman Recho; Jérôme Crépin. 2019. "Local scale fracture characterization of an advanced structured material manufactured by fused deposition modeling in 3D printing." Frattura ed Integrità Strutturale 14, no. 51: 534-540.

Journal article
Published: 24 June 2019 in Procedia CIRP
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This work focuses on the implementation of mechanical behaviors from a previous Fused Depositing Modelling (FDM) method [1] into a Finite Element Modelling (FEM) in order to compare the mechanical and numerical results. Indeed, a former research reproducing the principal stress directions into Compact Tension (C-T) samples has been carried out by using fracture mechanics analysis [1,2]. We replicated these principal stress directions through an extrusion deposition by 3D printing in order to improve the fracture toughness. Then, the results were analyzed by comparing a C-T standard tensile test procedure with classical and optimized filament deposition. Eventually, this work observed that the fracture toughness was improved up to 20 % compared to a classical deposition. The objective of this new study is to obtain a reliable numerical simulation to reproduce the previous method and check the mechanical phenomena. The proposed method implies local elements to capture the filaments trajectories and to associate them with the Acrylonitrile Butadiene Styrene (ABS) material's reference on ABAQUS.

ACS Style

Marouene Zouaoui; Carl Labergere; Julien Gardan; Ali Makke; Naman Recho; Quentin Alexandre; Pascal Lafon. Numerical Prediction of 3D Printed Specimens Based on a Strengthening Method of Fracture Toughness. Procedia CIRP 2019, 81, 40 -44.

AMA Style

Marouene Zouaoui, Carl Labergere, Julien Gardan, Ali Makke, Naman Recho, Quentin Alexandre, Pascal Lafon. Numerical Prediction of 3D Printed Specimens Based on a Strengthening Method of Fracture Toughness. Procedia CIRP. 2019; 81 ():40-44.

Chicago/Turabian Style

Marouene Zouaoui; Carl Labergere; Julien Gardan; Ali Makke; Naman Recho; Quentin Alexandre; Pascal Lafon. 2019. "Numerical Prediction of 3D Printed Specimens Based on a Strengthening Method of Fracture Toughness." Procedia CIRP 81, no. : 40-44.