Ahmed H Maamoun

McMaster University, Mechanical Engineering, Graduate Student

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Mr. Maamoun is a Ph.D. candidate in the mechanical engineering department at McMaster University. Also, he is a graduate research assistant at McMaster Manufacturing Research Institute (MMRI) and a member of Additive Manufacturing Group (AMG). His research focuses on the hybrid manufacturing that combines Additive manufacturing (AM) & Ultra precision micro-machining. His research objective during his Ph.D. program is to develop and characterize a method to produce efficient and lightweight optics, and optomechanical components by using the hybrid manufacturing process. In addition, post-processing is one of the leading steps in his research to prepare as-built additively manufactured parts for ultra-precision machining with a homogeneous microstructure and consistent material properties.

Mr. Maamoun worked as a mechanical design engineer from 2006, then, he awarded his Master Degree of science in mechanical engineering in 2011 from MTC.

Mr. Maamoun has a good experience in mechanical design of laser systems, laser engineering, rapid prototyping, additive manufacturing (metals/polymers) and Computer-aided mechanical design.

He is interested in R&D on the following topics:

1- Hybrid manufacturing (Additive manufacturing/Ultra-precision machining).
2- Additive Manufacturing of Al-alloys using the SLM technique.
3- Post-processing of additively manufactured parts.
4- Ultra Precision Micro-Machining.
5- Production of lightweight metallic optics and optomechanical components.
6- Mechanical design of laser systems.
7- Laser sintering rapid prototyping (SLS).
8- CAD/CAE/CAM.
Supervisors: Prof. Mohamed Elbestawi and Prof. Stephen Veldhuis
Phone: +19059289641 or +201005485385
Address: 1280 main st. west, Hamilton, Ontario, Canada

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Certificate of reviewing "Additive Manufacturing Journal"

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review certificate "Materials Journal"

MDPI is a publisher of open access, international, academic journals. We rely on active researche... more MDPI is a publisher of open access, international, academic journals. We rely on active researchers, highly qualified in their field to provide review reports and support the editorial process. The criteria for selection of reviewers include: holding a doctoral degree or having an equivalent amount of research experience; a national or international reputation in the relevant field; and having made a significant contribution to the field, evidenced by peer-reviewed publications.

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Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

The additive manufacturing (AM) of aluminum alloys promises to considerably enhance the performan... more The additive manufacturing (AM) of aluminum alloys promises to considerably enhance the performance of lightweight critical parts in various industrial applications. AlSi10Mg is one of the compatible Al alloys used in the selective laser melting of lightweight components. However, the surface defects obtained from the as-built parts affect their mechanical properties, and thus represent an obstacle to using them as final products. This study aims to improve the surface characteristics of the as-built AlSi10Mg parts using shot peening (SP). To achieve this goal, different SP intensities were applied to various surface textures of the as-built samples. The SP results showed a significant improvement in the as-built surface topography and a higher value of effective depth using 22.9 A intensity and Gp165 glass beads. The area near the shot-peened surface showed a significant microstructure refinement to a specific depth due to the dynamic precipitation of nanoscale Si particles. Surface hardening was also detected and high compressive residual stresses were generated due to severe plastic deformation. The surface characteristics obtained after SP could result in a significant improvement in the mechanical properties and fatigue strength, and thus promise performance enhancement for critical parts in various industrial applications.

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Thermal post-processing of AlSi10Mg parts produced by Selective Laser Melting using recycled powder

The performance enhancement of parts produced using Selective Laser Melting (SLM) is an important... more The performance enhancement of parts produced using Selective Laser Melting (SLM) is an important goal for various industrial applications. In order to achieve this goal, obtaining a homogeneous microstructure and eliminating material defects within the fabricated parts are important research issues. The objective of this experimental study is to evaluate the effect of thermal post-processing of AlSi10Mg parts, using recycled powder, with the aim of improving the microstructure homogeneity of the as-built parts. This work is essential for the cost-effective additive manufacturing (AM) of metal optics and optomechanical systems. To achieve this goal, a full characterization of fresh and recycled powder was performed, in addition to a microstructure assessment of the as-built fabricated samples. Annealing, solution heat treatment (SHT) and T6 heat treatment (T6 HT) were applied under different processing conditions. The results demonstrated an improvement in microstructure homogeneity after thermal post-processing under specific conditions of SHT and T6 HT. A micro-hardness map was developed to assist in the selection of the optimized post-processing parameters in order to satisfy the design requirements of the part.

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Computer Aided Design, Optimization and performance enhancement of solid state laser cavities

14th International Conference on Applied Mechanics and Mechanical Engineering AMME-14, 2010

Design of laser cavities is a complicated process. It includes several optical, geometrical and m... more Design of laser cavities is a complicated process. It includes several optical, geometrical and material parameters. Computer Aided Design of laser cavities reduces the time and effort required to reach the optimum design. In this paper an accurate and fast three dimensional CAD model for simulating solid-state laser systems is developed. Numerical estimations of the geometrical transfer efficiency of various cavities are presented. Analytical and iterative methods to achieve a feasible converged solution for designing optimum pumping champers which contains different geometrical dimensions of laser rods, flash lamps and walls reflectivity are discussed. A simulation study of the pumping efficiency of the laser heads with respect to the cavity geometry, different geometries of laser rods and flashlamps, and reflecting coatings have been carried out. The goal is to achieve a maximum concentration of the light flux of the pumping source towards the active medium. Results are presented using Matlab and Microsoft office excel. Computer aided design is then used to create three dimensional parametric model of laser cavity assembly. The proposed model has been compared with published results and shown to be very accurate and efficient for modeling three-dimensional solid-state laser chambers.

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Certificate of reviewing "Additive Manufacturing Journal"

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review certificate "Materials Journal"

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Influence of Shot Peening on AlSi10Mg Parts Fabricated by Additive Manufacturing

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Thermal post-processing of AlSi10Mg parts produced by Selective Laser Melting using recycled powder

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Computer Aided Design, Optimization and performance enhancement of solid state laser cavities

14th International Conference on Applied Mechanics and Mechanical Engineering AMME-14, 2010

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Ahmed H Maamoun

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