Vol 8 - Issue 1

Uncertainties and Reliability of Multiphysical Systems

List of Articles

4th edition of the Moroccan Workshop on 3D Printing hosted by Hassan II University Library of Mohamed SEKKAT, Casablanca, 2024

The Moroccan Association of Additive Manufacturing and 3D Printing is an association dedicated among other things to the promotion of scientific research in the promising field of additive manufacturing and 3D printing in Morocco. The organization of workshops is one of the key strategies to achieve this goal.

Bimetals 3D printing is a state-of-the-art technology, in which process parameters and heat treatments play key roles on the mechanical, thermal and structural properties of components. Our research goal is to investigate the potential of 3D printing bimetallic materials for different component parts according to each need. The procedures used in evaluating the results are based on the laser power, scanning speed, layer thickness, and materials of both additive manufacturing and heat treatments. The materials which were studied encompass Inconel 718, GH4169, 316L chrome steel, Inconel 625 and Ti6Al4V-W7Ni3Fe. It also shows the scanning speed has a large effect on the mechanical properties of Inconel 718, the laser power value when the porosity of GH4169 is at the minimum. Suitable functional materials produced by WAAM and wire-arc additive manufacturing assembly with robust, defect-free interface Indeed one of the other key observations from this study was that thermal conductivity and mechanical properties change significantly with the processing of the material, this then also strengthens the rationale for optimizing manufacturing parameters. This research highlights the potential of researching on materials with gradient properties and numerical simulation in future development of additive manufacturing of bimetallic and related alloys.

In recent years, additive manufacturing has emerged as a revolutionary technology, opening up new design possibilities. In this article, we examine the redesign and optimization of a wrist splint topology for additive manufacturing techniques. By taking advantage of the capabilities of this advanced manufacturing method. This study proposes to improve the functionality, ergonomics and overall performance of the wrist splint. The design process includes customized measurements based on CT scan or 3d scan, 3D modeling, and simulation to ensure optimal fit and structural integrity of the device. After finite element analysis, we evaluate the mechanical properties of the topologically optimized design. The results confirm that the proposed approach offers significant improvements in raw material consumption while maintaining the strength and ventilation required for patient comfort. Compared with the solid splint, the weight of the optimized wrist and hand splint is reduced by 46%.

The additive manufacturing process known as Fused Deposition Modeling (FDM) is distinguished by numerous parameters to be set. These parameters determine the mechanical properties and the overall quality of the printed parts. Among these parameters, we are interested in the filament deposition temperature. Indeed, during the systematic printing of each layer, the filaments that compose it undergo fusion, both inside the layer itself and between successive layers. The quality of this welding process significantly influences the resistance to crack propagation, between filaments of the same layer and/or between superimposed layers. This article focuses on the study of the impact of deposition temperature on the resistance to crack propagation in structures created by FDM. An analysis based on the J-Integral approach is developed.

The aim of this paper is to analyze the impact of 3D printing parameters on the strength of polylactic acid (PLA) parts. We will look at how the mechanical characteristics of printed objects are influenced by material properties, extruder temperature, printing speed and layer thickness. We will emphasize the importance of monitoring print parameters to ensure optimal quality and reproducibility of parts using traction tests on samples. To develop empirical models that will establish a correlation between print parameters and mechanical properties, we will use the Taguchi method. Our goal is to find the optimal parameters, such as layer thickness, extrusion temperature and print speed, in order to maximum rigidity of 3D printed parts.

Additive manufacturing, particularly Fused Deposition Modeling (FDM), has revolutionized the fabrication of customized products, offering an opportunity to make complex parts. However, inherent complexity of these parts demands attention to analyze them, especially in understanding their mechanical properties. This study uses a homogenization method to determine these properties using two scale technique. Our investigation explores the influence of building orientation (Flat, On-edge, Up-right) on longitudinal Young’s modulus. To achieve this, we begin by creating the appropriate Representative Volume Element (RVE) which embodies the microstructure of 3D printed specimens. Subsequently, we calculate orthotropic properties of this RVE using Material Designer tool. Then, these properties are integrated into the subdivided specimen using material Referencess within ANSYS Workbench. And finally, we validate our numerical findings with experimental results.

Additive manufacturing (AM) is an innovative and promising technology that can create complex geometries with great precision. However, parts manufactured using this technology exhibit residual stresses and distortions, which hinder widespread adoption. Directed energy deposition (DED) stands out as a promising AM technique, offering a high deposition rate compared to other AM processes. DED uses a focused energy source, such as a laser or electron beam, to melt material as it is deposited, enabling the creation and repair of complex geometries. The flexibility in material usage and the ability to control the microstructure during the process makes DED suitable for high-performance applications in aerospace, automotive, and biomedical industries. Finite element modeling (FEM) of the DED process can predict the melt pool, and temperature profile without extensive experimentation, saving considerable time, material, and money. In the current study, the FEM of a high-layer thickness DED process is developed using the Gaussian heat source model to investigate the effect of different process parameters. The model aims to enhance understanding of the thermomechanical behavior during the DED process and to optimize process parameters for improved part quality and performance.

Fused Deposition Modeling (FDM) process is widely used for various applications as it offers many benefits. Mechanical properties of parts manufactured using FDM technique are very critical. For that reason, it is important to understand how different values of process parameters affect these properties. The purpose of this research is to provide information related to the influence of various infill pattern and infill density. A literature review is carried out based on the current researches that investigate FDM 3D printing process of polymer materials. The results show that infill percentage then layer thickness are the most influential process parameter on most of the material’s mechanical properties. In addition, this work identifies gaps in existing studies and highlights opportunities for future research.