scholarly journals Numerical investigations on a framework for fracture prediction in metal forming with a material model based on stress-rate dependence and non-associated flow rule

2018 ◽  
Vol 1063 ◽  
pp. 012155
Author(s):  
T Oya ◽  
J Yanagimoto ◽  
K Ito ◽  
G Uemura ◽  
N Mori
Keyword(s):  
Metal Forming ◽  
Material Model ◽  
Fracture Prediction ◽  
Rate Dependence ◽  
Stress Rate ◽  
Flow Rule ◽  
Numerical Investigations ◽  
Model Based ◽  
Associated Flow Rule

scholarly journals Fracture prediction with a material model based on stress-rate dependency related with non-associated flow rule

2016 ◽  
Vol 80 ◽  
pp. 05003 ◽  
Author(s):  
Tetsuo Oya ◽  
Jun Yanagimoto ◽  
Koichi Ito ◽  
Gen Uemura ◽  
Naomichi Mori
Keyword(s):  
Material Model ◽  
Fracture Prediction ◽  
Stress Rate ◽  
Flow Rule ◽  
Rate Dependency ◽  
Model Based ◽  
Associated Flow Rule

scholarly journals Material Model based on Non-associated Flow Rule with Higher-order Yield Function for Anisotropic Metals

2014 ◽  
Vol 81 ◽  
pp. 1210-1215 ◽  
Author(s):  
Tetsuo Oya ◽  
Jun Yanagimoto ◽  
Koichi Ito ◽  
Gen Uemura ◽  
Naomichi Mori
Keyword(s):  
Material Model ◽  
Yield Function ◽  
Higher Order ◽  
Flow Rule ◽  
Model Based ◽  
Associated Flow Rule

Descriptions of Reversed Yielding in Internally Pressurized Tubes

2015 ◽  
Vol 138 (1) ◽  
Author(s):  
Sergei Alexandrov ◽  
Woncheol Jeong ◽  
Kwansoo Chung
Keyword(s):  
Yield Criterion ◽  
Numerical Technique ◽  
Kinematic Hardening ◽  
Material Model ◽  
Flow Rule ◽  
Hardening Material ◽  
Hardening Law ◽  
Solving Equations ◽  
Associated Flow Rule ◽  
Reversed Deformation

Using Tresca's yield criterion and its associated flow rule, solutions are obtained for the stresses and strains when a thick-walled tube is subject to internal pressure and subsequent unloading. A bilinear hardening material model in which allowances are made for a Bauschinger effect is adopted. A variable elastic range and different rates under forward and reversed deformation are assumed. Prager's translation law is obtained as a particular case. The solutions are practically analytic. However, a numerical technique is necessary to solve transcendental equations. Conditions are expressed for which the release is purely elastic and elastic–plastic. The importance of verifying conditions under which the Tresca theory is valid is emphasized. Possible numerical difficulties with solving equations that express these conditions are highlighted. The effect of kinematic hardening law on the validity of the solutions found is demonstrated.

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