Zobrazeno 1 - 10
of 12
pro vyhledávání: '"Alaa Olleak"'
Publikováno v:
Additive Manufacturing Letters, Vol 9, Iss , Pp 100197- (2024)
In this study, we investigated the microstructural variation of Ti-6Al-4 V in inverted pyramid parts built using Laser Powder Bed Fusion (LPBF). Two parts were fabricated with and without ghost parts to study the effects of interlayer delay time on t
Externí odkaz:
https://doaj.org/article/1f4edfbebc2f4f52887c739b8a731051
Autor:
Alaa Olleak, Florian Dugast, Prajwal Bharadwaj, Seth Strayer, Shawn Hinnebusch, Sneha Narra, Albert C. To
Publikováno v:
Additive Manufacturing Letters, Vol 3, Iss , Pp 100051- (2022)
This work proposes to combine matrix-free finite element modeling (FEM), adaptive remeshing, and graphical processing unit (GPU) computing to enable, for the first time, scanwise process simulation of the Laser Powder Bed Fusion (L-PBF) process with
Externí odkaz:
https://doaj.org/article/60570b619475412285944823c1a7e50e
Autor:
Alaa Olleak, Zhimin Xi
Publikováno v:
Manufacturing Letters. 24:140-144
As-built metallic parts manufactured by the laser powder bed fusion (LPBF) process are usually associated with high residual stresses and distortions due to the thermal cycles during the process. Finite Element Modeling (FEM) is widely used to simula
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::c51b607fd45015f1ae54d69ca5fd2390
https://doi.org/10.1016/j.mfglet.2020.05.002
https://doi.org/10.1016/j.mfglet.2020.05.002
Autor:
Alaa Olleak, Zhimin Xi
Publikováno v:
The International Journal of Advanced Manufacturing Technology. 107:573-584
Physics-based thermal simulation of laser powder bed fusion can greatly help understanding the process and reducing time and cost associated with experimental approaches. Numerical methods including the finite element method have been widely used to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ab39bfd970bdb3a6cd34cda5d673a56a
https://doi.org/10.1007/s00170-020-04995-7
https://doi.org/10.1007/s00170-020-04995-7
Autor:
Alaa Olleak, Zhimin Xi
Publikováno v:
Manufacturing Letters. 23:75-78
Understanding parts thermal history during the laser powder bed fusion (LPBF) process is crucial since it can help avoiding manufacturing defects, identifying hotspots, saving time and cost associated with experimental analysis. For the case of LPBF,
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::b2d7d70fab2f0410bf4bb1619284b514
https://doi.org/10.1016/j.mfglet.2020.01.003
https://doi.org/10.1016/j.mfglet.2020.01.003
Autor:
Alaa Olleak, Zhimin Xi
Publikováno v:
Procedia Manufacturing. 34:613-618
Quality and reliability of additively manufacturing (AM) parts using the selective laser melting (SLM) process are greatly influenced by the thermal history of the printing process. Prediction of parts thermal history using numerical methods, e.g. fi
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e355555967c4e4a9537f6c1ab5428bf4
https://doi.org/10.1016/j.promfg.2019.06.167
https://doi.org/10.1016/j.promfg.2019.06.167
Publikováno v:
ACC
Selective laser melting (SLM) is one of emerging processes for effective metal additive manufacturing. Due to complex heat exchange and material phase changes, it is challenging to accurately model the SLM dynamics and design robust control of SLM pr
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::585988a7cdb3f4fcde4489522bc14758
https://doi.org/10.23919/acc50511.2021.9483137
https://doi.org/10.23919/acc50511.2021.9483137
Autor:
Alaa Olleak, Zhimin Xi
Publikováno v:
Journal of Mechanical Design. 142
There are significant quality and reliability problems for components/products made by additive manufacturing (AM) due to various reasons. Selective laser melting (SLM) process is one of the popular AM techniques and it suffers from low quality and r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::ddce25634910c63c132d54045423c3f0
https://doi.org/10.1115/1.4045744
https://doi.org/10.1115/1.4045744
Publikováno v:
Production Engineering. 11:435-444
Cutting process of titanium alloy Ti-6Al-4V is considered difficult due to chemical affinity between tool and work material, adhesion, built-up edge and burr formation, and tool wear resulting in loss of productivity. Three dimensional (3-D) chip flo
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::a9768c3c4d3c758a5a1ba8f905a2b3e1
https://doi.org/10.1007/s11740-017-0761-4
https://doi.org/10.1007/s11740-017-0761-4
Autor:
Alaa Olleak, Tuğrul Özel
Publikováno v:
Procedia Manufacturing. 10:536-545
Surface texturing on cutting tools is considered a potential improvement to the tool performance both in dry machining with use of solid lubricants and in wet/cryogenic machining. This paper presents investigations on the effects of micro-textured to
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::83d152a943d4ba0ab57cfe3d58d32578
https://doi.org/10.1016/j.promfg.2017.07.042
https://doi.org/10.1016/j.promfg.2017.07.042