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: In this paper, a 3D simulation of a Mannesmann tube piercing is performed using the finite element software Forge 2005 and the sensitivity of the simulation results to numerical methods and physical parameters is discussed.
Abstract: A 3D simulation of Mannesmann tube piercing is performed using the finite element software Forge 2005®. The sensitivity of the simulation results to numerical methods and physical parameters is discussed. Advanced numerical schemes and refined time discretizations are required to obtain correct descriptions of the material flow. In this study, one concentrates on the stress state and damage development before the material comes in contact with the plug. Indeed, the crack is to appear prior to the action of the plug. The description of the material behaviour is found to be a key information to predict the crack development. Predictions based on a modified Lemaitre damage law and a normalised Latham and Cockroft criterion are compared.
20 citations
TL;DR: In this article, an effective methodology is reported for determining the optimal capacity (lot size) of batch processing and storage networks which include material recycle or reprocessing streams, where any given storage unit can store one material type which can be purchased from suppliers, internally produced, and internally consumed and/or sold to customers.
Abstract: An effective methodology is reported for determining the optimal capacity (lot size) of batch processing and storage networks which include material recycle or reprocessing streams. It is assumed that any given storage unit can store one material type which can be purchased from suppliers, internally produced, and internally consumed and/or sold to customers. It is further assumed that a storage unit is connected to all processing stages that use or produce the material to which that storage unit is dedicated. Each processing stage transforms a set of feedstock materials or intermediates into a set of products with constant conversion factors. The objective for optimization is to minimize the total cost composed of raw material procurement, setup, and inventory holding costs, as well as the capital costs of processing stages and storage units. A novel production and inventory analysis formulation, the PSW model, provides useful expressions for the upper/lower bounds and average level of the storage inventory holdup. The expressions for the Kuhn-Tucker conditions of the optimization problem can be reduced to two subproblems. The first yields analytical solutions for determining batch sizes, while the second is a separable concave minimization network flow subproblem whose solution yields the average material flow rates through the networks. For the special case in which the number of storage units is equal to the number of process stages and raw materials storage units, a complete analytical solution for average flow rates can be derived.
20 citations
TL;DR: In this paper, an axisymmetric model of radial forging of rods by an upper bound method (UBM) is proposed based on a kinematically admissible velocity field.
20 citations
Patent•
29 Sep 1994
TL;DR: In this article, an approach for reducing the particle size of material subjected to the impact of the hammers of a material reducing hammer mill in which oversize material impacted by the mill hammer is prevented from getting into the stream of properly sized material by being thrown against a flow impeding member which makes such material difficult to pass a material sizing fan having spinner blades that can not effectively intercept particles that are hard, improperly reduced, and require reduction.
Abstract: Apparatus for reducing the particle size of material subjected to the impact of the hammers of a material reducing hammer mill in which oversize material impacted by the mill hammer is prevented from getting into the stream of properly sized material by being thrown against a flow impeding member which makes such material difficult to pass a material sizing fan having spinner blades that can not effectively intercept particles that are hard, improperly reduced, and require reduction. Material flow impeding angular passages which offer resistance to flow of material that is hard and/or oversized are located to intercept the oversized material and return such material to the material reducing hammer mill for further size reduction before it is able to get into the product stream.
20 citations
07 Aug 2002
TL;DR: By incorporating stochastic Petri nets with the batch features, inhibitor arcs, and marking-dependent weights, operational policies of a supply chain can be easily described in the model.
Abstract: Batch deterministic and stochastic Petri nets are developed as a new tool for modeling and performance evaluation of supply chain. It is derived by enhancing deterministic and stochastic Petri nets. with batch places and batch tokens. Batch tokens, which have sizes and reside in batch places, are used to describe the information flow of a supply chain, while discrete tokens residing in discrete places are used to describe the material flow and the financial flow. By incorporating stochastic Petri nets with the batch features, inhibitor arcs, and marking-dependent weights, operational policies of a supply chain can be easily described in the model. A real-life supply chain is modeled by applying this tool and its performance is evaluated and optimized by simulation.
20 citations