Internal Friction Angle of Metal Powders

Metal powders are components with multidisciplinary usage as their application is very broad. Their consistent characterization across all disciplines is important for ensuring repeatable and trouble-free processes. Ten metal powders were tested in the study. In all cases, the particle size distribution and morphology (scanning electron microscope—SEM photos) were determined. The aim of this work was to inspect the flow behavior of metal powders through another measured characteristic, namely the angle of internal friction. The measured values of the effective internal friction angle in the range 28.6–32.9°, together with the spherical particle shape and the particle size distribution, revealed the likely dominant mode of the metal particle transfer mechanism for stainless steel 316L, zinc and aluminum powder. This third piston flow mechanism is described and illustrated in detail. The angle of internal friction is mentioned as another suitable parameter for the characterization of metal powders, not only for the relative simplicity of the determination but also for gaining insight into the method of the movement of individual particles during the flow

Internal Friction Angle of Metal Powders

Metal powders are components with multidisciplinary usage as their application is very broad. Their consistent characterization across all disciplines is important for ensuring repeatable and trouble-free processes. Ten metal powders were tested in the study. In all cases, the particle size distribution and morphology (scanning electron microscope—SEM photos) were determined. The aim of this work was to inspect the flow behavior of metal powders through another measured characteristic, namely the angle of internal friction. The measured values of the effective internal friction angle in the range 28.6–32.9°, together with the spherical particle shape and the particle size distribution, revealed the likely dominant mode of the metal particle transfer mechanism for stainless steel 316L, zinc and aluminum powder. This third piston flow mechanism is described and illustrated in detail. The angle of internal friction is mentioned as another suitable parameter for the characterization of metal powders, not only for the relative simplicity of the determination but also for gaining insight into the method of the movement of individual particles during the flow

OPTIMIZATION OF DOSING TANK EMPTYING USING SPIRAL VIBRATION

This article addresses the optimization of a dosing tank using a spiral harmonic motion. The dosing tank is used for the short-term storage of cohesive sand, which is then released into a tubular mold. Originally, a solution based on the principle of wiping the material using rotary blades and brushes was used to fill the molds. However, this method was not effective enough. This solution suffered from uneven dosing as well as loss of material. The mold filling time ranged around 20 seconds. During the course of optimization of the dosing tank, a new design of the tank was created and external energy in the form of harmonic spiral vibrations was introduced into the system. The chosen shape of the harmonic spiral motion proved to be the most suitable for the continuous emptying of the cohesive sand from the dosing tank into the tubular mold in a very short time. There was also a significant elimination of material losses. It was determined, that the frequency of harmonic motion affects uniform dispensing of material from tanks

Calibration of DEM Parameters for Cohesionless Bulk Materials under Rapid Flow Conditions and Low Consolidation

Why a white paper for DEM calibration? Although DEM simulations are increasingly used in many research and industrial fields, a standard approach for the determination of the right contact model parameters does not currently exist. The white paper is aimed to provide an overview about best practices for DEM simulation in the field of bulk material handling. The style of the paper is focussed on a comprehensive overview, not about a discussion or description of certain details. However, such a detailed description is required for the full understanding of the content. Hence, this white paper contains a number of important references.The white paper is planned as a ongoing project which can be changed and extended regarding the content and authors. The paper makes no claim to completeness but summarises the knowledge and experience of many experts to give an holistic overview of the topic

Calibration of DEM parameters for cohesionless bulk materials under rapid flow conditions and low consolidation

Why a white paper for DEM calibration? Although DEM simulations are increasingly used in many research and industrial fields, a standard approach for the determination of the right contact model parameters does not currently exist. The white paper is aimed to provide an overview about best practices for DEM simulation in the field of bulk material handling. The style of the paper is focussed on a comprehensive overview, not about a discussion or description of certain details. However, such a detailed description is required for the full understanding of the content. Hence, this white paper contains a number of important references.The white paper is planned as a ongoing project which can be changed and extended regarding the content and authors. The paper makes no claim to completeness but summarises the knowledge and experience of many experts to give an holistic overview of the topic.Transport Engineering and Logistic