Prediction of ductile damage and fracture in the single- and multi-stage incremental hole-flanging processes using a new damage accumulation law

2022 ◽  
Author(s):  
Seyyed Emad Seyyedi ◽  
Hamid Gorji ◽  
Mohammad Javad Mirnia ◽  
Mohammad Bakhshi-Jooybari
Keyword(s):  
Damage Accumulation ◽  
Ductile Damage ◽  
Damage And Fracture ◽  
Multi Stage ◽  
Hole Flanging

scholarly journals Prediction of Ductile Damage and Fracture in the Single and Multi-stage Incremental Hole-flanging Process Using a New Damage Accumulation Law

2021 ◽  
Author(s):  
Seyyed Emad Seyyedi ◽  
Hamid Gorji ◽  
Mohammad Javad Mirnia ◽  
Mohammad Bhakhshi-Jooybari
Keyword(s):  
Damage Accumulation ◽  
Single Point ◽  
Alloy Sheet ◽  
Fracture Prediction ◽  
Fem Model ◽  
User Subroutine ◽  
Damage And Fracture ◽  
Multi Stage ◽  
Non Linear ◽  
Hole Flanging

Abstract Incremental hole-flanging (IHF) is a process in which a sheet with a pre-cut hole is flanged by the single point incremental forming (SPIF) process. Fracture prediction in IHF, such as SPIF, is associated with many challenges due to the deformation mechanisms. The purpose of this paper is to overcome the existing limitations and challenges, and thus, to predict accurately failure in single, and multi-stage IHF processes. To this end, the modified Mohr-Coulomb (MMC) criterion was implemented using an appropriate user subroutine in a finite element method (FEM) model. The AA6061-T6 aluminum alloy sheet, which has low formability, and is fractured from its free edges in the IHF process, was examined as an example. Initially, a linear damage accumulation law, in which the prediction error is high due to the non-linear stress and strain states in the IHF, was used to predict the fracture. Therefore, in the next step, a non-linear damage accumulation function was utilized. While the non-linear accumulation accurately predicts the single-stage IHF fracture, it is not able to predict the fracture well in the multi-stage IHF. It was observed that in multi-stage IHF, the rate of damage accumulation decreases with increasing the number of forming stages. Accordingly, a new non-linear damage accumulation rule was developed. Experimental and numerical results indicated acceptable accuracy of the proposed non-linear accumulation in the fracture prediction in the single and multi-stage IHF process.

scholarly journals An experimental methodology to characterise post-necking behaviour and quantify ductile damage accumulation in isotropic materials

2019 ◽  
Vol 176-177 ◽  
pp. 191-206 ◽  
Author(s):  
A. Sancho ◽  
M.J. Cox ◽  
T. Cartwright ◽  
C.M. Davies ◽  
P.A. Hooper ◽  
...  
Keyword(s):  
Damage Accumulation ◽  
Experimental Methodology ◽  
Ductile Damage ◽  
Isotropic Materials

The Analysis of High-Speed Shearing Mechanic and Cross-Section about Sheet Metal

2011 ◽  
Vol 189-193 ◽  
pp. 3148-3152 ◽  
Author(s):  
Yu Gui Li ◽  
Fei Fan ◽  
Hai Lian Gui ◽  
Quan Ye
Keyword(s):  
Stress State ◽  
Sheet Metal ◽  
Cross Section ◽  
Fracture Mechanism ◽  
High Speed ◽  
Ductile Damage ◽  
Shearing Stress ◽  
Damage And Fracture ◽  
Metal Deformation

In the shearing process, these were many problems in shearing, the regularity of metal deformation of shearing was analyzed combined with theory of ductile damage and fracture mechanism of high-speed, the rules of factors which could be affected the shearing was analyzed on the velocity and shearing stress state. These theories would improve the shearing section.

Ductile damage and fracture finite element modelling of elasto-viscoplastic voided materials

1997 ◽  
Vol 7 (3) ◽  
pp. 295-307 ◽  
Author(s):  
F. Lauro ◽  
B. Bennani ◽  
P. Drazetic ◽  
J. Oudin ◽  
X. Ni
Keyword(s):  
Finite Element ◽  
Finite Element Modelling ◽  
Ductile Damage ◽  
Element Modelling ◽  
Damage And Fracture

scholarly journals Stress-triaxiality-dependent modeling of ductile damage and fracture behavior

PAMM ◽  
2010 ◽  
Vol 10 (1) ◽  
pp. 107-108
Author(s):  
Michael Brünig ◽  
Steffen Gerke ◽  
Daniel Albrecht
Keyword(s):  
Fracture Behavior ◽  
Stress Triaxiality ◽  
Ductile Damage ◽  
Damage And Fracture

A Coupled Computational Framework for Ductile Damage and Fracture

2008 ◽  
pp. 411-412
Author(s):  
Ron H. J. Peerlings ◽  
Jesus Mediavilla ◽  
Marc G. D. Geers
Keyword(s):  
Ductile Damage ◽  
Computational Framework ◽  
Damage And Fracture
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