Topic
Material flow
About: Material flow is a research topic. Over the lifetime, 3050 publications have been published within this topic receiving 36844 citations. The topic is also known as: material stream.
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TL;DR: Friction taper plug welding experiment was conducted on X65 pipeline steel in underwater wet condition as discussed by the authors, which showed that the weld defects, microstructural evolution and mechanical properties are closely related to the material flow behavior during welding.
25 citations
01 Jan 1999
TL;DR: In this paper, the authors introduce the concept of material intensity analysis and its methodology, and present results for the material intensity of infrastructure, vehicles and their use for various transport categories.
Abstract: In general transport is regarded today as one of the ecologically most critical sectors of our economy. However, up to now studies focused mainly on the emissions caused by the various transport modes (VIA 1990; HOpfner et al. 1993; Hassel et al. 1995, Mailbach et al. 1995), whereas the material intensity has been rather neglected. Therefore, in the following paper the material intensity of transportation will be analysed. In the beginning, the concept of material intensity analysis and its methodology will be introduced. Thereafter, results for the material intensity of infrastructure, vehicles and their use for various transport categories will be presented. Finally, the implications for a more sustainable mobility will be discussed.
24 citations
Journal Article•
TL;DR: In this paper, the authors investigate the effect of including the tool probe and the material flow in the numerical modelling of heat flow in friction stir welding (FSW), where the contact condition at the interface between the tool and workpiece controls the heat transfer mechanisms.
Abstract: The objective of the present paper is to investigate the effect of including the tool probe and the material flow in the numerical modelling of heat flow in friction stir welding (FSW). The contact condition at the interface between the tool and workpiece controls the heat transfer mechanisms. The convective heat transfer due to the material flow affects the temperature fields. Models presented previously in the literature allow the heat to flow through the probe volume, and the majority neglects the influence of the contact condition as the sliding condition is assumed. In this work, a number of cases is established. Each case represents a combination of a contact condition, i.e. sliding and sticking, and a stage of refinement regarding the heat source distribution. In the most detailed models, the heat flow is forced around the probe volume by prescribing a velocity field in shear layers at the tool/work piece interface. This results in a nonsymmetrical temperature field that depends not only on the total heat generation, tool/work piece geometry and thermal properties, but also on the contact condition, the tool’s rotational speed and the assumed shear layer thicknesses. The models are implemented in FEMLAB and configured in terms of the heat source as: shoulder contribution only; shoulder and probe contribution, the latter as a volume heat source distributed in the probe volume; and shoulder and probe contribution distributed at the contact interface, i.e. as a surface flux in the case of sliding and as a volume flux in the shear layers in the case of sticking.
24 citations
01 Jan 2014
TL;DR: In this paper, the authors deal with the numerical simulation and material flow visualization of Friction Stir Welding (FSW) processes using the fourth order Runge-Kutta (RK4) integration method for the computation of particle trajectories.
Abstract: This work deals with the numerical simulation and material flow visualization of Friction Stir Welding (FSW) processes. The fourth order Runge-Kutta (RK4) integration method is used for the computation of particle trajectories. The particle tracing method is used to study the effect of input process parameters and pin shapes on the weld quality. The results show that the proposed method is suitable for the optimization of the FSW process.
24 citations
TL;DR: In this article, a 3D numerical model is developed to study the flow mechanism at a corner under various conditions during the extrusion and deposition processes with rotational rectangular nozzle, and the results indicate that the rheological properties have little effect on the mass distribution ratio.
Abstract: When conducting corner printing with rotational rectangular nozzle, a greater amount of material is deposited inside the filament and hence tearing and skewing will occur on the surface of the printed filament. With the aim of maintaining the surface finish and mechanical properties of the printed filament, a 3D numerical model is developed to study the flow mechanism at a corner under various conditions during the extrusion and deposition processes with rotational nozzle. After experimental validation, the numerical model is employed to study the material flow mechanism under various conditions. The results indicate that the rheological properties have little effect on the mass distribution ratio. However, a high relative nozzle travel speed, larger corner radii and lower nozzle aspect ratio is a promising route in obtaining a uniform material distribution ratio. The interlinking of process parameters affects the material distribution ratio significantly as well. Furthermore, the importance of the factors that affect the mass distribution was determined quantitatively.
24 citations