Fracture in sheet metal forming: Effect of ductile damage evolution

2007 ◽  
Vol 85 (3-4) ◽  
pp. 205-212 ◽  
Author(s):  
M. Khelifa ◽  
M. Oudjene ◽  
A. Khennane
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Evolution ◽  
Ductile Damage

Numerical Prediction of Forming Limit in Hemispherical Punch Bulging by Lemaitre's Ductile Damage Model

2011 ◽  
Vol 110-116 ◽  
pp. 1437-1441 ◽  
Author(s):  
Farhad Haji Aboutalebi ◽  
Mehdi Nasresfahani
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Mechanics ◽  
Thin Sheet ◽  
Damage Model ◽  
Ductile Damage ◽  
Forming Limit ◽  
St14 Steel ◽  
Hemispherical Punch

Prediction of sheet metal forming limits or analysis of forming failures is a very sensitive problem for design engineers of sheet forming industries. In this paper, first, damage behaviour of St14 steel (DIN 1623) is studied in order to be used in complex forming conditions with the goal of reducing the number of costly trials. Mechanical properties and Lemaitre's ductile damage parameters of the material are determined by using standard tensile and Vickers micro-hardness tests. A fully coupled elastic-plastic-damage model is developed and implemented into an explicit code. Using this model, damage propagation and crack initiation, and ductile fracture behaviour of hemispherical punch bulging process are predicted. The model can quickly predict both deformation and damage behaviour of the part because of using plane stress algorithm, which is valid for thin sheet metals. Experiments are also carried out to validate the results. Comparison of the numerical and experimental results shows good adaptation. Hence, it is concluded that finite element analysis in conjunction with continuum damage mechanics can be used as a reliable tool to predict ductile damage and forming limit in sheet metal forming processes.

Damage Evolution Evaluation in DP600 Steel According Speed Variation in Sheet Metal Forming

2015 ◽  
Author(s):  
Márcio Madi ◽  
Paulo Victor Prestes Marcondes ◽  
Ravilson Antônio Chemin Filho ◽  
Lucas Marcondes Ribas
Keyword(s):  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Evolution ◽  
Speed Variation

Numerical Prediction of Damage Evolution in Sheet Metal Forming Processes with Nonlinear and Complex Strain Paths

2011 ◽  
Vol 473 ◽  
pp. 653-658
Author(s):  
Babak Jamshidi ◽  
Farhad Haji Aboutalebi ◽  
Mahmoud Farzin ◽  
Mohammad Reza Forouzan
Keyword(s):  
Sheet Metal ◽  
Plane Stress ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Evolution ◽  
Finite Strain ◽  
Damage Model ◽  
Sheet Metals ◽  
Strain Paths ◽  
Complex Strain

Various thin-walled parts with fairly complex shapes are produced from sheet metals such as automotive panels and other structural parts. In these processes, damage and fracture may be observed on the work piece, and formability plays a fundamental role. Therefore, determination of forming limits and prediction of rupture modes in these operations is very important for process design engineers. In this paper, first, based on plane stress elasto-plasticity and finite strain theories a fully coupled elastic-plastic-damage model is used to predict damage evolution in one sheet metal forming process with nonlinear and complex strain paths. As the plane stress algorithm is valid for thin sheet metals and finite strain theory is recommended for large deformations or rotations, the model is able to quickly predict both deformation and damage behaviour of the parts with nonlinear and complex strain paths. The numerical simulations are compared with experimental tests. Comparison of the numerical and experimental results shows that the proposed damage model is accurate for various forming conditions. Hence, it is concluded that finite element method combined with continuum damage mechanics, can be used as a reliable and rapid tool to predict damage evolution in sheet metal forming processes with nonlinear and complex strain paths.

scholarly journals Comparative Study on Damage Evolution during Sheet Metal Forming of Steels DP600 and DP1000

2017 ◽  
Vol 896 ◽  
pp. 012074 ◽  
Author(s):  
S Münstermann ◽  
J Lian ◽  
F Pütz ◽  
M Könemann ◽  
V Brinnel
Keyword(s):  
Comparative Study ◽  
Sheet Metal ◽  
Sheet Metal Forming ◽  
Metal Forming ◽  
Damage Evolution
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