Showing papers by "Hamid Garmestani published in 2022"
TL;DR: In this paper , a simple hydrothermal method was proposed to synthesize delaminated-Ti3C2/V2O5 hybrid nanostructures for hydrogen and oxygen evolution reactions.
25 citations
23 citations
TL;DR: In this paper , a symmetric supercapacitor (SSC) was fabricated using a hybrid electrode material for energy storage applications, which consists of ionic liquid and MoO 3 nanorods.
13 citations
4 citations
TL;DR: In this paper , an analytical method for the prediction of molten pool size in laser-based powder bed fusion (LPBF) additive manufacturing with the consideration of process conditions-dependent absorptivity was proposed.
Abstract: This research proposes an analytical method for the prediction of molten pool size in laser-based powder bed fusion (LPBF) additive manufacturing with the consideration of process conditions-dependent absorptivity. Under different process conditions, the melting modes in LPBF are different, which induces the difference in laser absorptivity. An empirical model of absorptivity was used to calculate the laser absorptivity under various process conditions. An analytical point-moving heat source model was employed to calculate the temperature distribution of the build-in LPBF, with absorptivity, material properties, and process conditions as inputs. The molten pool width, length, and depth were determined by comparing the predicted temperature profile with the melting temperature of the material. To validate the proposed method, the predicted molten pool width, and depth of Ti6Al4V were compared with the reported experimental measurements under various process conditions. The predicted molten pool widths were very close to the measured results, and the predictions of molten pool depth were also acceptable. The computational time of the presented model is less than 200s, which shows better computational efficiency than most methods based on numerical iterations, such as the finite element method (FEM). The sensitivity of molten pool width and depth to normalized enthalpy w also discussed. The presented analytical method can be a potential tool for the research of molten pool size and related defects in LPBF.
TL;DR: In this article , the texture evolution of ultra high molecular weight polyethylene (UHMWPE) subjected to different strains (up to engineering strains of 3.00) under uniaxial tension is presented.
TL;DR: In this article, the correlation between melt pool geometry and mechanical properties of selective laser melted (SLM) Ti-6Al-4V samples is investigated, and the results showed that AM process parameters control the amount of energy transferred into the powder and consequently the resulting microstructure.
Abstract:
Additive manufacturing (AM) method has attracted huge interest in the past decade due to its ability in building complicated geometries with a much lower cost than conventionally produced parts. In AM, the final mechanical properties can be controlled by the AM process parameters. In other words, the AM process parameters control the amount of energy that is transferred into the powder and consequently the resulting microstructure. In this study, the correlation between melt pool geometry and mechanical properties of selective laser melted (SLM) Ti–6Al–4V samples is investigated.