3D numerical simulation of anisotropic thin sheet metal slitting process using fully coupled constitutive equations including ductile damage

2009 ◽  
Vol 2 (S1) ◽  
pp. 535-538 ◽  
Author(s):  
K. Saanouni ◽  
N. Belamri ◽  
P. Autesserre
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Constitutive Equations ◽  
Thin Sheet ◽  
Ductile Damage ◽  
3D Numerical Simulation ◽  
Thin Sheet Metal ◽  
Fully Coupled

Advances in Virtual Metal Forming Including the Ductile Damage Occurrence: Application to 3D Sheet Metal Deep Drawing

2008 ◽  
Vol 130 (2) ◽  
Author(s):  
K. Saanouni ◽  
H. Badreddine ◽  
M. Ajmal
Keyword(s):  
Sheet Metal ◽  
Constitutive Equations ◽  
Deep Drawing ◽  
Metal Forming ◽  
Ductile Damage ◽  
Classical Dynamic ◽  
Damage Initiation ◽  
Integration Schemes ◽  
Local Integration ◽  
Fully Coupled

An advanced numerical methodology to simulate virtually any sheet or bulk metal forming including various kinds of initial and induced anisotropies fully coupled to the isotropic ductile damage is presented. First, the fully coupled anisotropic constitutive equations in the framework of continuum damage mechanics under large plastic deformation are presented. Special care is paid to the strong coupling between the main mechanical fields such as elastoplasticity, mixed nonlinear isotropic and kinematic hardenings, ductile isotropic damage, and contact with friction in the framework of nonassociative and non-normal formulation. The associated numerical aspects concerning both the local integration of the coupled constitutive equations as well as the (global) equilibrium integration schemes are presented. The local integration is outlined, thanks to the Newton iterative scheme applied to a reduced system of ordinary differential equations. For the global resolution of the equilibrium problem, the classical dynamic explicit (DE) scheme with an adaptive time step control is used. This fully coupled procedure is implemented into the general purpose finite element code for metal forming simulation, namely, ABAQUS/EXPLICIT. This gives a powerful numerical tool for virtual optimization of metal forming processes before their physical realization. This optimization with respect to the ductile damage occurrence can be made either to avoid the damage occurrence to have a nondamaged part as in forging, stamping, deep drawing, etc., or to favor the damage initiation and growth for some metal cutting processes as in blanking, guillotining, or machining by chip formation. Two 3D examples concerning the sheet metal forming are given in order to show the capability of the proposed methodology to predict the damage initiation and growth during metal forming processes.

Numerical Simulation of Cold Press Forging Forming for Stepped Hole of Thin Sheet Metal

2011 ◽  
Vol 121-126 ◽  
pp. 249-253
Author(s):  
Ke Sheng Wang ◽  
Jian Lin Liu ◽  
Xiao Wei Chen
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Thin Sheet ◽  
Effective Strain ◽  
Optimum Process ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Thin Sheet Metal ◽  
Deform 3D ◽  
Good Agreement

An optimum process for a two-step press forging of stepped holes in a metal sheet was proposed .Numerical simulation on the two-step process was carried out by using DEFORM-3D. Distributions of effective strain and effective stress were obtained. The study showed that the process not only can form the stepped, but also can increase the surface quality and strength of stepped holes in sheet metal parts, According to the numerical simulation’s process parameter , an experimental die was designed, the simulation results were in good agreement with the experimental data

Effect of Anisotropic Plastic Flow on the Ductile Damage Evolution in Hydrobulging Test of Thin Sheet Metal

2005 ◽  
Vol 8 (2-3) ◽  
pp. 271-289 ◽  
Author(s):  
Morad Khelifa ◽  
Houssem Badreddine ◽  
Abdelaziz Daoud ◽  
Mohamed Amen Gahbiche ◽  
Khémaïs Saaouni ◽  
...  
Keyword(s):  
Sheet Metal ◽  
Plastic Flow ◽  
Damage Evolution ◽  
Thin Sheet ◽  
Ductile Damage ◽  
Thin Sheet Metal ◽  
Anisotropic Plastic

Application of a Digital Strain Analyzer AutoGrid at Thin Sheet Metals Mechanical Characteristics Preparation and Assessment of their Drawability

2016 ◽  
Vol 246 ◽  
pp. 75-78
Author(s):  
Monika Hyrcza-Michalska
Keyword(s):  
Numerical Simulation ◽  
Sheet Metal ◽  
Thin Sheet ◽  
Operating Conditions ◽  
Inconel 625 ◽  
Forming Limit ◽  
The Road ◽  
Inconel Alloys ◽  
Thin Sheet Metal ◽  
On The Road

The paper presents the results of mechanical properties testing of thin sheet metal of INCONEL 625 and 718 alloys. These studies are a continuation of experience in the preparation of the technological characteristics of metal strips plasticity necessary for carrying out numerical simulations [1]. In order to process sheets now become necessary to design the process using software such as thermo-mechanical simulation e.g. Eta/DYNAFORM. On the road of numerical simulation are sought optimal conditions for processing sheets. It brings reducing the cost of industrial tests. However, becomes strictly necessary characteristics of mechanical and technological properties describing the characteristics of the charges for forming. Here the problem is solved if we forming limit curves (FLCs) designated and technological tests conducted. Using the FLCs is comprehensively defined stamping sheet metal press formability and technological tests allow the mapping of the actual operating conditions selected stamping operations. In the presented study used modern digital analyzer AutoGrid of local deformations and the method of image analysis of deformed mesh subdivision. The use of mesh analyzer and vision systems method significantly speeds up the possibility of producing FLCs. Also measurement accuracy is very high. Selected Inconel alloys are evaluated quantitatively and qualitatively by preparing their properties characterization. The acquired data entered into the database material properties of sheet metal and used in the numerical simulation of stamping process of Inconel 625 cone drawpiece. The legitimacy of the use of modern strain analyzer AutoGrid has been confirmed.

scholarly journals A new way to identify thin sheet behaviour: Micro-InDef

2020 ◽  
Vol 1 (2) ◽  
pp. 59-66
Author(s):  
Pierrick Malecot Malecot ◽  
Gemala Hapsari ◽  
Sebastien Thibaud ◽  
Fabrice Richard
Keyword(s):  
Sheet Metal ◽  
Large Strain ◽  
Single Point ◽  
Thin Sheet ◽  
Ductile Damage ◽  
Inelastic Behavior ◽  
Forming Force ◽  
Thin Sheet Metal ◽  
Deformation Test ◽  
The One

Incremental forming is a rapid prototyping process which uses a forming tool toform a sheet metal according to a predetermined trajectory. In this work, a micro incremental deformation test (Micro InDef test) derived from the principle of single point incremental sheet forming is developed and proposed. A complex mechanical loading is applied and has a strong potential for the identication of inelastic behavior using inverse method. In the rst part, this work addresses the parameters identication and validation procedures of ductile damage behavior of ultra-thin sheet metal under very large strain during this instrumented Micro InDef test. An inverse nite element method based on the comparison between numerical and experimental axial forming forces of the micro incremental deformation test is employed to extract a coupled ductile damaged plastic model. In the second part, the objective is to prove the reliability of ductile damage parameters identication using forming force. The richness of data contained in forming force is quantied and compared to the one from tensile test. Firstly, the verication of the estimated parameter's reliability is done via a simple analysis based on the forming force sensitivity to material parameters and secondly by calculating elastoplastic and elastoplastic with ductile damage.

Comparability of structured and flat reference specimens made of thin sheet metal

2015 ◽  
Vol 57 (6) ◽  
pp. 567-573 ◽  
Author(s):  
Fedor Kazak ◽  
Sabine Weiß
Keyword(s):  
Sheet Metal ◽  
Thin Sheet ◽  
Thin Sheet Metal ◽  
Reference Specimens

Experimental and Numerical Analysis of Blanking for Thin Sheet Metal Parts

2001 ◽  
Vol 4 (3-4) ◽  
pp. 319-333
Author(s):  
Vincent Lemiale ◽  
Philippe Picart ◽  
Sébastien Meunier
Keyword(s):  
Numerical Analysis ◽  
Sheet Metal ◽  
Thin Sheet ◽  
Metal Parts ◽  
Sheet Metal Parts ◽  
Thin Sheet Metal
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