A Three-Dimensional Finite Element Analysis of the Cold Forging of a Model Aluminium Connecting Rod

1985 ◽  
Vol 199 (4) ◽  
pp. 319-324 ◽  
Author(s):  
I Pillinger ◽  
P Hartley ◽  
C E N Sturgess ◽  
G W Rowe
Keyword(s):  
Computer Simulation ◽  
Finite Element ◽  
Strain Hardening ◽  
Metal Flow ◽  
Three Dimensional ◽  
Cold Forging ◽  
Connecting Rod ◽  
Element Analysis ◽  
Hardening Material ◽  
Elastic Plastic

A fully three-dimensional elastic-plastic finite element method is used to simulate metal flow during the most complex stage of the cold forging of a model of an aluminium connecting rod. The results of the computer simulation are compared with the forging of strain-hardening aluminium billets using graphite lubrication. The analysis predicts deformation patterns and hardness distributions which have been checked by selected experiments. The experimental results show inhomogeneous deformation in various parts of the forging and noticeable variations in the formation of flash around its periphery, features which are also found in the analyses. The elastic-plastic finite element technique can thus satisfactorily be applied to three-dimensional forgings of strain-hardening material. The work described here represents one part of a continuing research programme to develop computer simulation techniques for the modelling of complex cold, warm or hot industrial forgings.

Incremental Variable Plastic Three-Dimensional Elastic-Plastic Finite Element Analysis in Soft Rock Tunnel Excavation

2014 ◽  
Vol 508 ◽  
pp. 243-248 ◽  
Author(s):  
Jun Peng Li ◽  
Xiao Li ◽  
Dong Qing Zhu
Keyword(s):  
Finite Element Analysis ◽  
Finite Element ◽  
Three Dimensional ◽  
Soft Rock ◽  
Analysis Model ◽  
Element Analysis ◽  
Tunnel Excavation ◽  
Elastic Plastic ◽  
Stiffness Method ◽  
Rock Tunnel

The plane finite element analysis is mostly adopted in soft rock tunnel excavation instead of three-dimensional nonlinear finite element analysis at present, but almost every underground engineering is a spatial nonlinear problem which, in many cases, cannot be simplified into a plane problem. This paper presents a three-dimensional elastic-plastic finite element analysis of incremental variable plastic in soft rock tunnel excavation, through analyzing the tunnel excavation and support, and combining the incremental variable plastic stiffness method into three-dimensional elastic-plastic model in light of the advantage of increment variable stiffness method and the incremental additional load method. Simulation results show that, the three-dimensional elastic-plastic finite element analysis model presented in this paper changes little final deformation under different load release coefficients, together with small support stress.

Three-Dimensional Elastic-Plastic Finite-Element Analysis of the Flattening of Wire Between Plain Rolls*

2000 ◽  
Vol 123 (3) ◽  
pp. 397-404 ◽  
Author(s):  
H. Utsunomiya ◽  
P. Hartley ◽  
I. Pillinger
Keyword(s):  
Finite Element ◽  
Elastic Recovery ◽  
Three Dimensional ◽  
Lateral Spread ◽  
Radius Of Curvature ◽  
Forming Process ◽  
Empirical Formulas ◽  
Element Analysis ◽  
Finite Element Program ◽  
Elastic Plastic

It is normal industrial practice to roll round edged flat wires from round circular wires using plain rolls. Although this is not a complex type of metal forming process, the internal deformation is highly three-dimensional. It is important to be able to determine the lateral spread, elongation and final profile precisely. In this paper, this process has been analyzed using an elastic-plastic finite element program. Firstly, algorithms for integrating the constitutive equations, i.e., return mapping algorithms, are evaluated to determine the most accurate technique. Then, the influences of friction and reduction in thickness on the deformation characteristics are investigated. The lateral spread and the radius of curvature of the free surface are quantitatively in reasonable agreement with those obtained from empirical formulas. The lateral spread increases with friction and with reduction. The variation of elongation in the roll bite is investigated in detail. It is found that the elongation is not uniformly distributed across the cross section. After passing the roll gap, the distribution is compensated by the elastic recovery of wire, otherwise it may cause edge waves.

Three-Dimensional Finite Element Analysis of Elastic-Plastic Crack Problems

1981 ◽  
Vol 103 (3) ◽  
pp. 214-218 ◽  
Author(s):  
B. V. Kiefer ◽  
P. D. Hilton
Keyword(s):  
Finite Element ◽  
Normal Stress ◽  
Crack Front ◽  
Stress Component ◽  
Three Dimensional ◽  
Specimen Thickness ◽  
Element Analysis ◽  
Finite Element Program ◽  
Elastic Plastic ◽  
Crack Problems

A three-dimensional, elastic-plastic finite element program is developed and applied to analyze the stress field in a plate containing a through crack. The center cracked plate is subjected to uniform tensile loading which results in mode I opening of the crack surfaces. Transverse variations of the opening tensile stress component and of the effective stress (von Mises) in the vicinity of the crack front are presented. They clearly demonstrate the three-dimensional nature of this problem with distributions that depend on specimen thickness. For thinner plates, the plastic deformation concentrates near the plate surfaces while the normal stress is largest in the plate interior. In thicker plates the deformation and normal stress fields are more uniform in the plate interior near the crack front, but they develop a rapid boundary layer-type variation in the vicinity of the plate surfaces.

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