FINITE ELEMENT ANALYSIS OF DEFORMATION CHARACTERISTICS IN HEAVY SLAB ROLLING

2009 ◽  
Vol 23 (06n07) ◽  
pp. 1591-1596 ◽  
Author(s):  
YO-HAN JI ◽  
JONG-JIN PARK ◽  
CHANG-HO MOON ◽  
MYUNG-SHIK CHUN ◽  
HAE-DOO PARK
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Hydrostatic Stress ◽  
Effective Strain ◽  
Middle Layer ◽  
Element Analysis ◽  
Cylindrical Pore ◽  
Pressure Distributions ◽  
The Finite Element Analysis ◽  
Pore Closure

Plastic deformation that occurs in a heavy slab during plane-strain rolling was investigated by the finite element analysis. A cylindrical pore was assumed to be located along the transverse direction of a slab. The effective strain was found to be the largest at the sub-surface layer and the smallest at the middle layer, where the shear strain developed the least. Pore closure was most difficult at the middle layer. This is where hydrostatic stress in addition to effective strain developed the least. Rolling torques, rolling forces and pressure distributions at the roll/slab interface were investigated as well, under various conditions.

Study on the cavity closure behavior of steel ingots during open die forging

2019 ◽  
Vol 233 (13) ◽  
pp. 2447-2457
Author(s):  
Yongchul Kwon ◽  
Sangsik Kim ◽  
Jonghun Kang
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Theoretical Basis ◽  
Effective Strain ◽  
Element Analysis ◽  
Large Steel ◽  
The Finite Element Analysis ◽  
Cavity Closure ◽  
Steel Ingots ◽  
Open Die Forging

The manufacturing of sound forgings from large steel ingots requires that internal cavity defects generated during the steel ingot solidification process be compressed by open die forging. The forging ratio that is generally recommended to remove internal defects in large forged products is 3S (threefold); however, the practice lacks a theoretical basis. In this study, a forging experiment and a finite element analysis were performed to investigate the correlation between the forging ratio for large steel ingots (3S) and the cavity closure behavior. First, a hot compression experiment was performed by varying the temperature and strain rate, and the flow stress data observed in the experiment was applied to the finite element analysis. In the experiment for the cogging process, the forging ratio was applied to an actual non-compressive defect material. The finite element analysis was performed using the same forging path as the forging experiment. In the cogging experiment, cavity closure was found by ultrasonic inspection at the forging ratio of 2.9S. The finite element analysis showed that the size of the cavity was significantly decreased at the forging ratio of 2.9S. A finite element analysis was also performed to investigate effective strain and hydrostatic stress at the forging ratio of 2.9S. Finally, this article provides the theoretical basis for the limitation of the internal defect size in initial materials, the threshold effective strain, and the limiting forging ratio of forged products to ensure the internal soundness of large forged products.

Conformal Contact Between a Rubber Band and Rigid Cylinders

2012 ◽  
Vol 79 (4) ◽  
Author(s):  
Takuya Morimoto ◽  
Hiroshi Iizuka
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Rubber Band ◽  
Element Analysis ◽  
Geometrical Nonlinearities ◽  
Pressure Distributions ◽  
The Finite Element Analysis ◽  
Theoretical Results ◽  
Conformal Contact ◽  
Good Agreement

We consider a conformal contact problem between a rubber band and rigid cylinders that involves geometrical and material nonlinearities. The rubber band is assumed to be incompressible, neo-Hookean rubber. From the geometry and elasticity of the band, we present simple formulas to estimate the force–stretch relations and the contact pressure distributions on the cylinder. We show that the theoretical results are in good agreement with those of the finite element analysis when the rubber band is thin enough to be negligible to the bending stiffness. This verifies that the theory can effectively take into account both the material and geometrical nonlinearities of the band under the present conditions.

Finite Element Analysis of Penetrating Head Injury

2003 ◽  
Author(s):  
Jiangyue Zhang ◽  
Narayan Yoganandan ◽  
Frank A. Pintar ◽  
Thomas A. Gennarelli
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Head Injuries ◽  
Rigid Bodies ◽  
Head Model ◽  
Element Analysis ◽  
Pressure Distributions ◽  
Injury Mechanisms ◽  
The Finite Element Analysis ◽  
Quantitative Understanding

The objective of this study is to biomechanical quantify the intracranial displacement and pressure distributions associated with civilian projectiles to advance clinical understanding of the pathophysiological consequences of penetrating head injuries. A finite element head model was developed in an attempt to investigate the penetrating processes and brain injury mechanisms. Two geometrical shapes of projectiles (flat and pinpoint headed) were considered for penetration. They were modeled as rigid bodies (6.5 and 9 g) impacting at an initial velocity of 300 m/s. The head was modeled as a spherical skull with left and right hemispheres. Material properties and damage criteria for the skull and brain were based on literature. The penetration process was modeled with eroding contact surface method with LS-DYNA. Elements considered damaged were removed from further computation when the stress or strain reached their thresholds. Temporal displacement and pressure distributions are described. The effects of projectile type on the wounding pattern are discussed. The entry location responded with higher magnitudes of displacement than other locations (e.g., exit, mid brain). The flat head projectile penetration resulted in higher magnitudes of pressure and displacement than the pinpoint projectile in the entire skull-brain system. The finite element analysis provides a quantitative understanding of the localized intrinsic responses secondary to projectile penetration.

Study of 6061 Aluminum Alloy Milling Using Four-Blade Face Cutter

2015 ◽  
Vol 661 ◽  
pp. 62-68
Author(s):  
Dyi Cheng Chen ◽  
Ci Syong You ◽  
Chia An Tu ◽  
Chieh Hsin Ni
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Aluminum Alloy ◽  
Effective Strain ◽  
Cutting Speed ◽  
Face Milling ◽  
Element Analysis ◽  
Milling Cutter ◽  
The Finite Element Analysis ◽  
Tool Types

In this paper, construction of finite element analysis based on DEFORMTM 3D four-blade face milling cutter aluminum 6061 cutting, explore the finite element analysis of face milling cutter rotating in a circle cutting of aluminum alloy 6061.Tool types used WC milling cutters, cutting speed, feed rate as fixed process parameters. The study analyzed four rotations of the blade face milling chip formation, effective stress, effective strain and material changes in temperature and tool wear.

Interactive Graphics for the Analysis of Tires

1985 ◽  
Vol 13 (3) ◽  
pp. 127-146 ◽  
Author(s):  
R. Prabhakaran
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Approximate Solutions ◽  
Interactive Graphics ◽  
Element Analysis ◽  
Analysis Process ◽  
Physical Problems ◽  
The Finite Element Analysis ◽  
Analysis Computer ◽  
Discretization Technique

Abstract The finite element method, which is a numerical discretization technique for obtaining approximate solutions to complex physical problems, is accepted in many industries as the primary tool for structural analysis. Computer graphics is an essential ingredient of the finite element analysis process. The use of interactive graphics techniques for analysis of tires is discussed in this presentation. The features and capabilities of the program used for pre- and post-processing for finite element analysis at GenCorp are included.

Finite Element Analysis of Nonuniformity of Tires with Imperfections5

2007 ◽  
Vol 35 (3) ◽  
pp. 226-238 ◽  
Author(s):  
K. M. Jeong ◽  
K. W. Kim ◽  
H. G. Beom ◽  
J. U. Park
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Element Model ◽  
Radial Force ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Dimensional Finite Element ◽  
Force Variation ◽  
Three Dimensional Finite Element

Abstract The effects of variations in stiffness and geometry on the nonuniformity of tires are investigated by using the finite element analysis. In order to evaluate tire uniformity, a three-dimensional finite element model of the tire with imperfections is developed. This paper considers how imperfections, such as variations in stiffness or geometry and run-out, contribute to detrimental effects on tire nonuniformity. It is found that the radial force variation of a tire with imperfections depends strongly on the geometrical variations of the tire.

Use of the Finite Element Analysis Method in Pedodontics

2018 ◽  
Vol 55 (4) ◽  
pp. 666-675
Author(s):  
Mihaela Tanase ◽  
Dan Florin Nitoi ◽  
Marina Melescanu Imre ◽  
Dorin Ionescu ◽  
Laura Raducu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Structural Model ◽  
Analysis Method ◽  
Ansys Software ◽  
Concentrated Force ◽  
Element Analysis ◽  
Finite Element Analysis Method ◽  
The Finite Element Analysis ◽  
Solid Type

The purpose of this study was to determinate , using the Finite Element Analysis Method, the mechanical stress in a solid body , temporary molar restored with the self-curing GC material. The originality of our study consisted in using an accurate structural model and applying a concentrated force and a uniformly distributed pressure. Molar structure was meshed in a Solid Type 45 and the output data were obtained using the ANSYS software. The practical predictions can be made about the behavior of different restorations materials.

A necessary modification for the finite element analysis of cracked members detection, construction, and justification

2013 ◽  
Vol 83 (7) ◽  
pp. 1087-1096 ◽  
Author(s):  
A. Ranjbaran ◽  
H. Rousta ◽  
M. O. Ranjbaran ◽  
M. A. Ranjbaran ◽  
M. Hashemi ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Cracked Members

Modeling and experimental verification on directivity of an electret cell array loudspeaker

2012 ◽  
Vol 24 (3) ◽  
pp. 326-333 ◽  
Author(s):  
Yu-Chi Chen ◽  
Wen-Ching Ko ◽  
Han-Lung Chen ◽  
Hsu-Ching Liao ◽  
Wen-Jong Wu ◽  
...  
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Digital Control System ◽  
Analysis Model ◽  
Cell Array ◽  
Element Analysis ◽  
Finite Element Analysis Model ◽  
The Finite Element Analysis ◽  
Directivity Characteristics

We propose a model to give us a method to investigate the characteristic three-dimensional directivity in an arbitrarily configured flexible electret-based loudspeaker. In recent years, novel electret loudspeakers have attracted much interest due to their being lightweight, paper thin, and possessing excellent mid- to high-frequency responses. Increasing or decreasing the directivity of an electret loudspeaker makes it excellent for adoption to many applications, especially for directing sound to a particular area or specific audio location. Herein, we detail a novel electret loudspeaker that possesses various directivities and is based on various structures of spacers instead of having to use multichannel amplifiers and a complicated digital control system. In order to study the directivity of an electret loudspeaker based on an array structure which can be adopted for various applications, the horizontal and vertical polar directivity characteristics as a function of frequency were simulated by a finite-element analysis model. To validate the finite-element analysis model, the beam pattern of the electret loudspeaker was measured in an anechoic room. Both the simulated and experimental results are detailed in this article to validate the various assertions related to the directivity of electret cell-based smart speakers.

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