Small-scale Finite Element Modelling of the Plastic Deformation Zone in the Incremental Forming Process

2008 ◽  
Vol 1 (S1) ◽  
pp. 1159-1162 ◽  
Author(s):  
P. Eyckens ◽  
A. Van Bael ◽  
R. Aerens ◽  
J. Duflou ◽  
P. Van Houtte
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Deformation Zone ◽  
Finite Element Modelling ◽  
Incremental Forming ◽  
Small Scale ◽  
Plastic Deformation Zone ◽  
Forming Process ◽  
Element Modelling

Study of a modified ECAP die for producing nanostructured Al6060 alloy using 3D finite element simulation

2016 ◽  
Vol 1818 ◽  
Author(s):  
M. A. González-Lozano ◽  
P. Ponce-Peña ◽  
M.A. Escobedo-Bretado ◽  
R.H. Lara-Castro ◽  
B. X. Ochoa-Salazar
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Severe Plastic Deformation ◽  
Tensile Stress ◽  
Deformation Zone ◽  
Plastic Deformation Zone ◽  
Element Analysis ◽  
Ecap Processing ◽  
Angular Pressing ◽  
Element Simulation

ABSTRACTUsing Finite Element Method (FEM) simulations is possible to study the homogeneity of deformation in the Equal Channel Angular Pressing (ECAP) process. In this work an investigation about the influence of a modified die on strain distribution in an ecaped Al6060 alloy was carried out. Due to that, tensile stress occurs in the vicinity of upper surface of the specimen in the severe plastic deformation zone, which increases the cracking and fracture tendency of the specimen and impedes further ECAP processing, the conventional ECAP die was modified to eliminate the tensile stress and enhance the compressive stress in the severe plastic deformation zone and reducing the cracking and fracture tendency of the specimen. Finite element analysis demonstrated that the stress state changes from tensile to strongly compressive when using the modified die. The aim of this study is to evaluate the advantages/disadvantages of the modified ECAP die and processing conditions.

Finite element modelling of forming process of solid metal with liquid phase

1991 ◽  
Vol 27 (1-3) ◽  
pp. 111-118 ◽  
Author(s):  
Ken-ichiro Mori ◽  
Kozo Osakada ◽  
Masanori Shiomi
Keyword(s):  
Finite Element ◽  
Liquid Phase ◽  
Finite Element Modelling ◽  
Solid Metal ◽  
Forming Process ◽  
Element Modelling

Experimental Evaluation of the Size Effect on the Ductile and Brittle Fracture Toughness of a Steel Pressure Vessel

2009 ◽  
Vol 614 ◽  
pp. 41-46
Author(s):  
Zhao Xi Wang ◽  
Hui Ji Shi ◽  
Jian Lu
Keyword(s):  
Fracture Toughness ◽  
Plastic Deformation ◽  
Brittle Fracture ◽  
Size Effect ◽  
Ductile Fracture ◽  
Deformation Zone ◽  
High Stress ◽  
Small Scale ◽  
Plastic Deformation Zone ◽  
Zone Size

Experiments of fracture toughness with non-standard SENB specimens of five different thicknesses were performed to investigate the size effect on the ductile and brittle fracture for different temperatures. From the experimental results it is found that size effects both brittle and ductile fracture with the same trend but for different mechanical reasons. The ductile fracture toughness increases firstly with increased plastic deformation zone size and plastic fracture strain under general yielding conditions, and then drops down due to the plastic deformation zone size not changing much which is less than the residual ligament width and the increase of the proportion of the high stress triaxiality zone to the whole specimen. The fracture toughness of the lower shelf increases with increasing thickness of the plastic deformation zone size under small scale yielding conditions, and then drops down due to the increase of the high out-of-plane constraint.

The Effect of Die Channel Angles and their Combination on Plastic Deformation of Pure Copper during Equal Channel Angular Pressing Using Finite Element Modelling

2019 ◽  
Vol 31 ◽  
pp. 63-69
Author(s):  
Malothu Ramulu ◽  
Arkanti Krishnaiah
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Material Flow ◽  
Finite Element Modelling ◽  
Pure Copper ◽  
Plastic Deformations ◽  
Channel Angle ◽  
Element Modelling ◽  
Angular Pressing ◽  
Strain Inhomogeneity

It was investigated the effect of die channel angles and their combination on plastic deformation of pure copper during ECAP under friction and frictionless conditions using 2-D elastic-plastic finite element modelling. A sound knowledge obtained for the plastic deformation (material flow) and understood the relationships between plastic deformations. The modelling results suggested that strain inhomogeneity was lesser in channel angle 120o than channel angle 90o and pressing load as well as strain decrease with increasing die channel angle. The friction influence in case of combination of channel angles was negligible as compare to individual channel angles. The strain generation and distribution was more uniform in case of combination of channel angles as compare to individual channel angles.

A Relation between Laboratory and Full-Scale Testing of Polyester/Polyester Composites under Static and Dynamic Load

2007 ◽  
Vol 561-565 ◽  
pp. 725-728
Author(s):  
Pieter Samyn ◽  
Jan Quintelier ◽  
Wim Van Paepegem ◽  
Wim De Waele
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Large Scale ◽  
Fibre Orientation ◽  
Small Scale ◽  
Test Results ◽  
Tribological Behaviour ◽  
Test Configuration ◽  
Element Modelling ◽  
Polyester Composites

The tribological behaviour of a polymer composite is compared during small-scale and large-scale sliding tests and it is observed that test results strongly depend on the fibre orientation and test configuration. Different wear mechanisms are evaluated by optical microscopy and finite element modelling in relation to a real application of polyester/polyester discs as bearing elements.

Finite element modelling and model updating of small scale composite propellers

2017 ◽  
Vol 176 ◽  
pp. 154-163 ◽  
Author(s):  
P.J. Maljaars ◽  
M.L. Kaminski ◽  
J.H. den Besten
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Model Updating ◽  
Small Scale ◽  
Element Modelling

Effects of spall edge profiles on the edge plastic deformation for a roller bearing

2017 ◽  
Vol 233 (5) ◽  
pp. 850-861 ◽  
Author(s):  
Jing Liu ◽  
Zhifeng Shi ◽  
Yimin Shao ◽  
Huifang Xiao
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Finite Element Model ◽  
Deformation Zone ◽  
Element Model ◽  
Plastic Deformation Zone ◽  
Plastic Deformations ◽  
Zone Width ◽  
Rolling Element ◽  
The Finite Element Model

A clear understanding of the plastic deformations at the spall edges is a primary task for the edge propagation predictions in rolling element bearings. This work proposed an elastic–plastic two-dimensional finite element model for calculating the contact stress and plastic deformation between the rolling element and raceway. This model includes a rolling element and one raceway. The rectangular plane strain solid elements are used to formulate the finite element model. The Coulomb model is used to formulate the friction force between the rolling element and raceway. A bilinear kinematic hardening material model is used in the finite element model, which can formulate the elastic–plastic deformations. The studied spall edge profiles are assumed to be sharp and cylindrical ones. To validate the finite element model, the contact deformations between the rolling element and the raceway from the proposed model and Hertzian contact theory are compared. Effects of spall edge profiles on the edge plastic deformations at the edge are analyzed, as well as the edge plastic deformation zone width. Based on the numerical results, the relationship between the edge plastic deformation and the spall edge profile, and that between the edge plastic deformation zone width and the spall edge profile are established. The results show that the edge plastic deformation is significantly influenced by the spall edge profiles, as well as the edge plastic deformation zone width. This paper provides a clear understanding of the effects of the edge profiles on the plastic deformations and propagation at the spall edge.

A critical examination of the relationship between plastic deformation zone size and Young's modulus to hardness ratio in indentation testing

2006 ◽  
Vol 21 (10) ◽  
pp. 2617-2627 ◽  
Author(s):  
J. Chen ◽  
S.J. Bull
Keyword(s):  
Finite Element Analysis ◽  
Plastic Deformation ◽  
Finite Element ◽  
Young’S Modulus ◽  
Deformation Zone ◽  
Young's Modulus ◽  
Critical Examination ◽  
Analytical Relationship ◽  
Plastic Deformation Zone ◽  
Element Analysis

Existing indentation models (both analytical models and numerical analysis) show a linear relationship between δr/δm and H/Er, where δr and δm are the residual and maximum indentation depth, and Er and H are the reduced Young's modulus and hardness of the test material. Based on the analysis of Oliver and Pharr, a new relationship between δr/δm and H/Er has been derived in a different way without any additional assumptions, which is nonlinear, and this has been verified by finite element analysis for a range of bulk materials. Furthermore, this new relationship for residual depth is used to derive an analytical relationship for the radius of the plastic deformation zone Rp in terms of the residual depth, Young’s modulus, and hardness, which has also been verified by finite element simulations for elastic perfectly plastic materials with different work hardening behavior. The analytical model and finite element simulation confirms that the conventional relationship used to determine Rp developed by Lawn et al. overestimates the plastic deformation, especially for those materials with high E/H ratio. The model and finite element analysis demonstrate that Rp scales with δr, which is sensible given the self-similarity of the indentations at different scales, and that the ratio of Rp/δr is nearly constant for materials with different E/H, which contradicts the conventional view.

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