Further Analysis of Axisymmetric Upsetting

1986 ◽  
Vol 108 (3) ◽  
pp. 198-204 ◽  
Author(s):  
W. T. Carter ◽  
D. Lee
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Calibration Method ◽  
Internal Diameter ◽  
Element Analysis ◽  
Interfacial Conditions ◽  
The Finite Element Analysis ◽  
Updated Lagrangian Formulation ◽  
Updated Lagrangian ◽  
Experimental Findings

Analytical modeling of deformation processing methods requires a thorough understanding of the die–billet interfacial conditions, in particular, the nature of frictional boundary conditions. In order to gain insight into the role of friction on the deformation behavior of metals under uniaxial compression, a series of carefully controlled experiments were made with 6061-T6 aluminum cylinder and ring specimens. From measurements of the change in internal diameter and the height of the ring specimens, the average friction coefficient can be found using the calibration method proposed by Male and Cockcroft. Using this friction coefficient, a series of finite element analyses were made to model the deformation of solid aluminum cylinders which were compressed under identical die–billet contact conditions. An updated Lagrangian formulation and the contact surface algorithm of the ADINA finite element code were used in the analysis. Comparison of the experimental findings with those of the finite element analysis shows some discrepancies; possible causes for these differences are identified.

Modeling and Simulation of Pharmaceutical Powder Compaction

2012 ◽  
Vol 217-219 ◽  
pp. 1403-1406
Author(s):  
Guo Ning Si ◽  
Chen Lan
Keyword(s):  
Finite Element ◽  
Friction Coefficient ◽  
Powder Compaction ◽  
The Finite Element Method ◽  
Compression Process ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Pharmaceutical Powder ◽  
Cap Model ◽  
Powder Compression

The finite element method was conducted to simulate the pharmaceutical powder compression process by using Drucker–Prager Cap model and elastic-plastic deformation theory. The effects of different friction coefficient on tablet property were systematically studied. The results show that the pressure-density curves shift towards right-hand side with slight decrease at smaller friction coefficient. The fluidity of powder remains the inverse decrease with the friction coefficient, and the density distribution changed more uniform. The maximum Mises stress becomes larger with the friction coefficient increased. The powder displacement decreases near die as the friction coefficient increasing. The research can both predict the tablet property and provide the theory reference for tablet practice production through the finite element analysis of pharmaceutical powder compaction.

scholarly journals Sensitivity improvement of a new structure crack meter with angular adjustment

2019 ◽  
Vol 52 (9-10) ◽  
pp. 1545-1551
Author(s):  
Li Hong ◽  
Jiahui Wang ◽  
Zhenjing Yao
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Element Analysis ◽  
The Finite Element Analysis ◽  
Shape Structure ◽  
Sensitivity Improvement ◽  
Experimental Findings ◽  
Higher Sensitivity ◽  
Ansys Workbench ◽  
Structure Crack

In order to enhance the sensitivity improvement of crack meter in ruins rescue site, this paper proposes a novel crack meter with a V-shape structure. The mathematical analysis showed that there is a negative correlation between sensitivity of proposed crack and angle of V-shape structure. The finite element analysis using the ANSYS Workbench illustrates that sensitivity of proposed crack meter has rapid reduce with angle of V-shape structure of 14°–28°. Experimental findings show that the proposed V-shape structure crack meter has a higher sensitivity than the traditional one. With 14° V-shape structure crack meter, the sensitivity was enhanced to 1.16 mV/(mm/V), with an increase of 2.3 times over the traditional crack meter sensitivity of 0.35 mV/(mm/V).

Experimental and Numerical Analysis of Titanium Alloy Microtube Tube-End Nosing Forming

2018 ◽  
Vol 920 ◽  
pp. 16-21
Author(s):  
Chien Yi Chen ◽  
Tsung Chia Chen
Keyword(s):  
Finite Element ◽  
Titanium Alloy ◽  
Friction Coefficient ◽  
Cone Angle ◽  
Contact Problems ◽  
Plastic State ◽  
Flow Rule ◽  
Forming Process ◽  
Element Analysis ◽  
Updated Lagrangian

This study is mainly based on five sets of mold cone angle and friction coefficient of micro-tube tube end necking forming analysis, and the tool cone angle of 60° experimental verification is carried out to analyze the titanium alloy (Grade 1) micro-tube for different mold cone angle and the different friction coefficient caused by the difference between the shrinkage forming. In this paper, Prandtl-Reuss's plastic flow rule, combined with finite element deformation theory and updated Lagrangian formulation (ULF) concept, establish an incremental elasto-plastic finite element analysis program for simulating the miniature tube end necking. The forming process also uses the generalized rmin algorithm to deal with elasto-plastic state and contact problems. From the simulation data of necking process, deformation history, punch load and punch stroke, stress and strain distribution is obtained. The analysis results show that by increasing the mold cone angle and friction coefficient, the thickness tends to be thicker in the certain area.

Finite-Element Analysis of the Double Lateral Compression of Clad Tube into a Symmetric Square-Tube

2011 ◽  
Vol 337 ◽  
pp. 332-335 ◽  
Author(s):  
Tsung Chia Chen ◽  
Jiun Ming Ye
Keyword(s):  
Finite Element ◽  
Three Dimensional ◽  
Strain Hardening Exponent ◽  
Element Analysis ◽  
Circular Tubes ◽  
Geometric Ratio ◽  
Updated Lagrangian Formulation ◽  
Symmetric Square ◽  
Clad Tube ◽  
Updated Lagrangian

The squaring process to shape a circular tube into a symmetric square clad tube is examined by a three-dimensional incremental elastic-plastic finite-element method based on an updated Lagrangian formulation. The effects of various parameters, such as geometric ratio R/t, strain hardening exponent n, friction coefficient μ, and the length of tube L, on the occurrence of collapse in the squaring process are discussed and interpreted in a theoretical manner. The findings show that geometric ratio is the major factor in the process of squaring circular tubes. When R/t=25, serious collapse is likely to appear. Aiming at circular tubes with geometric ratio R/t=25, this study proposes six analysis configurations for clad tubes to discuss the possibility of clad tubes avoiding collapse. The findings showed that clad tubes could effectively reduce the collapse ratio.

Nonlinear Viscoelastic Finite Element Analysis of Adhesive Joints

1988 ◽  
Vol 16 (3) ◽  
pp. 146-170 ◽  
Author(s):  
S. Roy ◽  
J. N. Reddy
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Viscoelastic Behavior ◽  
Bonded Joints ◽  
Adhesively Bonded ◽  
Element Analysis ◽  
Adhesively Bonded Joints ◽  
Nonlinear Viscoelastic ◽  
Structural Failures ◽  
Updated Lagrangian

Abstract A good understanding of the process of adhesion from the mechanics viewpoint and the predictive capability for structural failures associated with adhesively bonded joints require a realistic modeling (both constitutive and kinematic) of the constituent materials. The present investigation deals with the development of an Updated Lagrangian formulation and the associated finite element analysis of adhesively bonded joints. The formulation accounts for the geometric nonlinearity of the adherends and the nonlinear viscoelastic behavior of the adhesive. Sample numerical problems are presented to show the stress and strain distributions in bonded joints.

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.

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