Optical and Thermal Behavior of Germanium Thin Films under Femtosecond Laser Irradiation

Autor: Ahmed Abdelmalek, Lebogang Kotsedi, Zeyneb Bedrane, El-Hachemi Amara, Marco Girolami, Malik Maaza

Publikováno v: Nanomaterials, Vol 12, Iss 21, p 3786 (2022)

In this study, we theoretically investigate the response of a germanium thin film under femtosecond pulsed laser irradiation. Electron and lattice temperatures, as well as material-specific optical properties such as dielectric function and reflectiv

Externí odkaz: https://doaj.org/article/36744193fafe4feea1f7f5f19d85d46e

The Marangoni Convection Effect on Melt Pool Formation during Selective Laser Melting Process

Autor: F. Hamadi, Karim Kheloufi, Kada Boughrara, Cherifa Abid, El-Hachemi Amara, Samia Aggoune, Toufik Tamsaout

Publikováno v: Defect and Diffusion Forum. 412:107-114

In order to predict the effect of the Marangoni convection and the morphology of melted stainless steel powder, during the selective laser melting (SLM) process, a transient three-dimensional numerical model is developed at the mesoscale. The evoluti

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::9440b3a4b9dfcdfd37c6b6823ccca6c7
https://doi.org/10.4028/www.scientific.net/ddf.412.107

Ablation of Copper Metal Films by Femtosecond Laser Multipulse Irradiation

Autor: Ahmed Abdelmalek, Zeyneb Bedrane, El-Hachemi Amara, Belén Sotillo, Vibhav Bharadwaj, Roberta Ramponi, Shane M. Eaton

Publikováno v: Applied Sciences, Vol 8, Iss 10, p 1826 (2018)

Ablation of copper using multipulse femtosecond laser irradiation with an 800 nm wavelength and 120-fs pulse duration is investigated theoretically. A two-temperature model, which includes dynamic optical and thermal-physical properties, is considere

Externí odkaz: https://doaj.org/article/846c6c608b184d7ca8baafcc6367aef8

Numerical approach for hydrodynamic behavior in the kerf with a quasi-complete model of the laser cutting process

Autor: El-Hachemi Amara, Toufik Tamsaout, A Bouabdallah

Publikováno v: Journal of the Optical Society of America. A, Optics, image science, and vision. 37(11)

The fundamental physical phenomena occurring during the process of laser cutting are still only slightly understood, and thus the need to develop mathematical and numerical models to optimize the process parameters has become unavoidable for obtainin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::aecdcfec3d501c5ebac2414b0e26a65b
https://pubmed.ncbi.nlm.nih.gov/33175738

CFD MODEL OF LASER ADDITIVE MANUFACTURING PROCESS OF CYLINDERS

Autor: El-Hachemi Amara, Sisa Pityana, Karim Kheloufi, Nana Kwamina Kum Arthur, Toufik Tamsaout

Publikováno v: South African Journal of Industrial Engineering, Vol 28, Iss 3, Pp 178-187 (2017)
South African Journal of Industrial Engineering, Volume: 28, Issue: 3, Pages: 178-187, Published: 2017

A theoretical approach based on a numerical simulation using experimental data is proposed as a contribution to the study of laser-based additive manufacturing by direct energy deposition (DED). The aim is to simulate the stages of layer-by-layer bui

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c594a5548ca0deb0f8616932006e6991
http://sajie.journals.ac.za/pub/article/view/1855