scholarly journals Ductile Fracture Criteria for Cutting Surfacesof Punching Process by Finite Element Method

2011 ◽  
Vol 52 (609) ◽  
pp. 1104-1108 ◽  
Author(s):  
Toru TANAKA ◽  
Seiya HAGIHARA ◽  
Yuichi TADANO ◽  
Takuma INADA ◽  
Takanobu MORI ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ductile Fracture ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria ◽  
Punching Process ◽  
Element Method

scholarly journals Application of Finite Element Method to Analysis of Ductile Fracture Criteria for Punched Cutting Surfaces

2013 ◽  
Vol 54 (9) ◽  
pp. 1697-1702 ◽  
Author(s):  
Toru Tanaka ◽  
Seiya Hagihara ◽  
Yuichi Tadano ◽  
Takuma Inada ◽  
Takanobu Mori ◽  
...  
Keyword(s):  
Finite Element Method ◽  
Finite Element ◽  
Ductile Fracture ◽  
Fracture Criteria ◽  
Ductile Fracture Criteria ◽  
Element Method

Finite Element Analysis of the Hydro-Mechanical Punching Process

2006 ◽  
Vol 505-507 ◽  
pp. 871-876
Author(s):  
Jong Hun Yoon ◽  
Hoon Huh ◽  
Yong Sin Lee ◽  
Seung Soo Kim ◽  
E.J. Kim ◽  
...  
Keyword(s):  
Hydrostatic Pressure ◽  
Ductile Fracture ◽  
Sheet Material ◽  
Middle Surface ◽  
Initial Crack ◽  
Fracture Criteria ◽  
Element Analysis ◽  
Final Fracture ◽  
Ductile Fracture Criteria ◽  
Punching Process

This paper investigates the characteristics of a hydro-mechanical punching process. The hydro-mechanical punching process is divided into two stages: the first stage is the mechanical half piercing in which an upper punch goes down before the initial crack is occurred; the second stage is the hydro punching in which a lower punch goes up until the final fracture is occurred. Ductile fracture criteria such as the Cockcroft et al., Brozzo et al. and Oyane et al. are adopted to predict the fracture of a sheet material. The index value of ductile fracture criteria is calculated with a user material subroutine, VUMAT in the ABAQUS Explicit. The hydrostatic pressure retards the initiation of a crack in the upper region of the blank and induces another crack in the lower region of the blank during the punching process. The final fracture zone is placed at the middle surface of the blank to the thickness direction. The result demonstrates that the hydro-mechanical punching process makes a finer shearing surface than the conventional one as hydrostatic pressure increases.

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