Finite Element Simulation of Powder Sintering
نویسندگان
چکیده
منابع مشابه
Numerical simulation of powder flow by Finite Element methods
In contrast to most fluids, flowing powders do not exhibit viscosity such that a Newtonian rheology cannot accurately describe granular flow. Assuming that the material is incompressible, dry, cohesionless, and perfectly rigid-plastic, generalized Navier-Stokes equations (’Schaeffer Model’) have been derived where the velocity gradient has been replaced by the shear rate, and the viscosity depe...
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Abstract. The flowing of powders brings a new challenging and interesting problem to the CFD community: at very high concentrations and low rate-of-strain, grains are in permanent contact, rolling on each other. Therefore a frictional stress model must be taken into account. This can be done using plasticity and similar theories in which the granular material behaviour is assumed to be independ...
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Pyroplastic deformation is a distortion of the ceramic shape during the sintering process. It occurs because the flow of the vitreous phase at high temperature and the applied stress due to the weight of the product during sintering process. The aim of this paper deals with describing a numerical-experimental method to evaluate the pyroplastic deformation, to predict the anisotropic shrinkage a...
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Fusion welding is widely used in heavy industries to join different parts together. But sometimes welding-induced distortions cause problems like misalignment during assembling and make costs to remove them. Thus it is imperative to predict and mitigate them to improve weldments quality and also reduce in fabrication costs. This study at first will introduce inherent deformation method for pred...
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Densification and distortion of W-Ni-Fe tungsten heavy alloys during liquid phase sintering are modeled using constitutive laws of grain growth, densification, and deformation. The models are ‘‘calibrated’’ via carefully designed experiments to obtain the necessary parameters to enable modeling. Metallographic analysis of quenched samples is used to obtain grain size data as functions of time a...
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ژورنال
عنوان ژورنال: Journal of the Japan Society of Powder and Powder Metallurgy
سال: 2009
ISSN: 0532-8799,1880-9014
DOI: 10.2497/jjspm.56.587