The Experts below are selected from a list of 81621 Experts worldwide ranked by ideXlab platform
Norio Takakura - One of the best experts on this subject based on the ideXlab platform.
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Finite Element Simulation of the shearing mechanism in the blanking of sheet metal
Journal of Materials Processing Technology, 2003Co-Authors: Nobuo Hatanaka, K. Yamaguchi, Norio TakakuraAbstract:Abstract Numerical Simulation of the blanking process of a sheet metal, i.e. the formation of roll-over and a burnished surface, and crack initiation and propagation, is done using a rigid–plastic Finite Element code developed by the authors. The modified Cockcroft and Latham expression is used as a ductile fracture criterion and is linked with the Simulation. It is assumed that when the ductile fracture threshold is satisfied at an Element, a crack occurs and propagates through the Element. The node separate method is proposed as a method for simulating the crack propagation. To confirm the results of Finite Element Simulation, blanking experiments are also carried out using a steel sheet of 3 mm thickness under various clearances between the punch and the die, and the crack propagation with punch penetration and the shape of the sheared edge are observed. These experimental results show good agreement with those of the Finite Element Simulation.
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Finite Element Simulation of the shearing mechanism in the blanking of sheet metal
Journal of Materials Processing Technology, 2003Co-Authors: Nobuhiko Hatanaka, K. Yamaguchi, Norio TakakuraAbstract:Numerical Simulation of the blanking process of a sheet metal, i.e. the formation of roll-over and a burnished surface, and crack initiation and propagation, is done using a rigid-plastic Finite Element code developed by the authors. The modified Cockcroft and Latham expression is used as a ductile fracture criterion and is linked with the Simulation. It is assumed that when the ductile fracture threshold is satisfied at an Element, a crack occurs and propagates through the Element. The node separate method is proposed as a method for simulating the crack propagation. To confirm the results of Finite Element Simulation, blanking experiments are also carried out using a steel sheet of 3mm thickness under various clearances between the punch and the die, and the crack propagation with punch penetration and the shape of the sheared edge are observed. These experimental results show good agreement with those of the Finite Element Simulation. © 2003 Elsevier Science B.V. All rights reserved.
Yigit Karpat - One of the best experts on this subject based on the ideXlab platform.
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temperature dependent flow softening of titanium alloy ti6al4v an investigation using Finite Element Simulation of machining
Journal of Materials Processing Technology, 2011Co-Authors: Yigit KarpatAbstract:Abstract Titanium alloy Ti6Al4V is the most commonly used titanium alloy in the aerospace and medical device industries due to its superior properties. There has been a considerable amount of research to better understand the serrated chip formation mechanism of titanium alloy Ti6Al4V by using Finite Element Simulation of machining. An accurate representation of the behavior of the material is important in order to obtain reliable results from the Finite Element Simulation. Flow softening behavior has been integrated into the material constitutive models to simulate adiabatic shear bands and serrated chips. Flow softening is usually related to the dynamic recrystallization phenomenon which initiates after a critical temperature. The aim of this study is to investigate the influence of various flow softening conditions on the Finite Element Simulation outputs for machining titanium alloy Ti6Al4V. For this purpose, a new flow softening expression, which allows defining temperature-dependent flow softening behavior, is proposed and integrated into the material constitutive model. The influence of flow softening below the critical temperature, as adopted in recent studies, is also investigated. Various temperature-dependent flow softening scenarios are tested using Finite Element Simulations, and the results are compared with experimental data from the literature. The results showed that the flow softening initiating around 350–500 °C combined with appropriate softening parameters yields Simulation outputs that agree well with the experimental measurements.
Nobuhiko Hatanaka - One of the best experts on this subject based on the ideXlab platform.
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Finite Element Simulation of the shearing mechanism in the blanking of sheet metal
Journal of Materials Processing Technology, 2003Co-Authors: Nobuhiko Hatanaka, K. Yamaguchi, Norio TakakuraAbstract:Numerical Simulation of the blanking process of a sheet metal, i.e. the formation of roll-over and a burnished surface, and crack initiation and propagation, is done using a rigid-plastic Finite Element code developed by the authors. The modified Cockcroft and Latham expression is used as a ductile fracture criterion and is linked with the Simulation. It is assumed that when the ductile fracture threshold is satisfied at an Element, a crack occurs and propagates through the Element. The node separate method is proposed as a method for simulating the crack propagation. To confirm the results of Finite Element Simulation, blanking experiments are also carried out using a steel sheet of 3mm thickness under various clearances between the punch and the die, and the crack propagation with punch penetration and the shape of the sheared edge are observed. These experimental results show good agreement with those of the Finite Element Simulation. © 2003 Elsevier Science B.V. All rights reserved.
K. Yamaguchi - One of the best experts on this subject based on the ideXlab platform.
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Finite Element Simulation of the shearing mechanism in the blanking of sheet metal
Journal of Materials Processing Technology, 2003Co-Authors: Nobuo Hatanaka, K. Yamaguchi, Norio TakakuraAbstract:Abstract Numerical Simulation of the blanking process of a sheet metal, i.e. the formation of roll-over and a burnished surface, and crack initiation and propagation, is done using a rigid–plastic Finite Element code developed by the authors. The modified Cockcroft and Latham expression is used as a ductile fracture criterion and is linked with the Simulation. It is assumed that when the ductile fracture threshold is satisfied at an Element, a crack occurs and propagates through the Element. The node separate method is proposed as a method for simulating the crack propagation. To confirm the results of Finite Element Simulation, blanking experiments are also carried out using a steel sheet of 3 mm thickness under various clearances between the punch and the die, and the crack propagation with punch penetration and the shape of the sheared edge are observed. These experimental results show good agreement with those of the Finite Element Simulation.
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Finite Element Simulation of the shearing mechanism in the blanking of sheet metal
Journal of Materials Processing Technology, 2003Co-Authors: Nobuhiko Hatanaka, K. Yamaguchi, Norio TakakuraAbstract:Numerical Simulation of the blanking process of a sheet metal, i.e. the formation of roll-over and a burnished surface, and crack initiation and propagation, is done using a rigid-plastic Finite Element code developed by the authors. The modified Cockcroft and Latham expression is used as a ductile fracture criterion and is linked with the Simulation. It is assumed that when the ductile fracture threshold is satisfied at an Element, a crack occurs and propagates through the Element. The node separate method is proposed as a method for simulating the crack propagation. To confirm the results of Finite Element Simulation, blanking experiments are also carried out using a steel sheet of 3mm thickness under various clearances between the punch and the die, and the crack propagation with punch penetration and the shape of the sheared edge are observed. These experimental results show good agreement with those of the Finite Element Simulation. © 2003 Elsevier Science B.V. All rights reserved.
Majid S. Hashmi - One of the best experts on this subject based on the ideXlab platform.
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Development of a novel method of tube bending using Finite Element Simulation
Journal of Materials Processing Technology, 2004Co-Authors: Sophie Baudin, P. Ray, Bryan J. Mac Donald, Majid S. HashmiAbstract:A novel tube bending method has been developed to form an elbow section from a straight tube using internal pressure and a rigid die. The process uses the rigid die to guide the tube into the elbow when pushed by a punch and internal pressure is used to prevent wrinkling and buckling. This paper presents the results from the Finite Element Simulation process that was used to validate the concept and the design. A comparison between using internal hydraulic pressure via a liquid and using a urethane rod to supply the internal pressure was undertaken and the results are presented here.
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Finite Element Simulation of bulge forming of a cross-joint from a tubular blank
Journal of Materials Processing Technology, 2000Co-Authors: Bryan J. Mac Donald, Majid S. HashmiAbstract:A Finite Element Simulation of the manufacture of cross branches from straight tubes, using the bulge forming method, was performed to investigate the effects of varying process parameters. A Finite Element model was built and validated against experimental measurements. Two different types of loading were employed: internal pressure load only and combined internal pressure and axial loading. The effects of friction and tube thickness variation are examined, and deformations, stresses and tube thinning/thickening behaviour in the formed component are presented.
