...Bin Xiao; Yuwen Zhang A three-dimensional model describing melting and resolidification of direct metal laser sintering of loose powders on top of sintered layers with a moving Gaussian laser beam is developed. Natural convection in the liquid pool driven by buoyancy and Marangoni effects is taken...

... of the experimental setup was conducted to investigate the heat transfer performance and internal temperature distribution, which was then used as a reference for the experiment. Hot compaction experiments were carried out, and the effects of compression force and temperature on the quality in terms of powder...

...Andrew J. Pinkerton; Waheed Ul Haq Syed; Lin Li The process of coincident wire and powder deposition by laser has recently emerged in research work as a layered manufacturing method with a higher deposition rate than the established laser direct metal deposition technique and as a means of creating...

...Tiebing Chen; Yuwen Zhang A three-dimensional model of selective laser sintering of a two-component loose metal powder layer on top of previously sintered layers by a single-line laser scanning is presented. A temperature-transforming model is employed to model melting and resolidification...

...Heng Pan; Todd Sparks; Yogesh D. Thakar; Frank Liou The quality and efficiency of laser-aided direct metal deposition largely depends on the powder stream structure below the nozzle. Numerical modeling of the powder concentration distribution is complex due to the complex phenomena involved...

...Tiebing Chen; Yuwen Zhang Laser sintering of a metal powder mixture that contains two kinds of metal powders with significantly different melting points under a moving Gaussian laser beam is investigated numerically. The continuous-wave laser-induced melting accompanied by shrinkage...

...Heng Pan; Robert G. Landers; Frank Liou This paper presents an approach for modeling powder delivery system dynamics in low flow rate applications. Discrete particle modeling (DPM) is utilized to analyze the motion of individual powder particles. In DPM, an irregular bouncing model is employed...

...Yinglin Ke; Gang Liu In order to improve the precision of machining and reduce the processing cost of paper honeycomb core, a new method is presented to fix the honeycomb core work piece to the working platform using magnetic and frictional forces. In this method, iron powder is used as a medium...

...- and microscale gives the microdeposition method some advantages over micromachining or lithography methods investigated extensively in the past. In this paper, work on deposition technology is reviewed, including material, supply of material, powder flow rate, and manipulation of particles and microdeposition...

...Ashok V. Kumar, Mem. ASME, Associate Professor; Anirban Dutta A layered manufacturing technique that uses electrophotography is described where powder is picked up and deposited using a charged photoconducting surface and deposited layer by layer on a build platform. A test bed was designed...

...Marios D. Demetriou; Adrienne S. Lavine; Nasr M. Ghoniem Coated powder particles composed of a ceramic core and a metallic coating are being considered for plasma spray applications. The goal of using these powders is to produce particulate-reinforced metal-matrix composite coatings. In this work...

...Franz-Josef Kahlen; Aravinda Kar This paper presents a set of process parameter selection rules to deposit a good metal part. A CO 2 laser is used to melt metal powder to achieve layer by layer deposition for fabricating three-dimensional parts. Dimensionless numbers characterizing this powder...

...M. Kandis, Graduate Student, Student Mem. ASME; T. L. Bergman, Professor and Head, Fellow ASME Numerical simulation of the laser-induced formation of shapes from polymer powders is achieved using an extension of a previously developed model of nonisothermal powder sintering. The extended model...