A robust and efficient substepping scheme for the explicit numerical integration of a rate-dependent crystal plasticity model

2014 ◽  
Vol 99 (4) ◽  
pp. 239-262 ◽  
Author(s):  
K. Zhang ◽  
O. S. Hopperstad ◽  
B. Holmedal ◽  
S. Dumoulin
Keyword(s):  
Numerical Integration ◽  
Crystal Plasticity ◽  
Plasticity Model ◽  
Rate Dependent ◽  
Crystal Plasticity Model

An incremental-update formulation to simulate earing behaviour with crystal plasticity model

2011 ◽  
Vol 225 (8) ◽  
pp. 1774-1781 ◽  
Author(s):  
S Zhang ◽  
S Huang ◽  
D Li ◽  
Y Peng
Keyword(s):  
Crystal Plasticity ◽  
Deformation Behaviour ◽  
Az31 Alloy ◽  
Alloy Sheet ◽  
Plasticity Model ◽  
Explicit Finite Element ◽  
Rate Dependent ◽  
Crystal Plasticity Model ◽  
Finite Element Package ◽  
Incremental Update

To gain a better understanding about the influence of initial texture on deformation behaviour of sheet metals, an incremental-update formulation is adopted for implementing rate-dependent crystal plasticity model into the explicit finite element package, ABAQUS/Explicit. In this formulation, the configuration in the last increment serves as a reference frame, and the stress, grain orientation and hardening behaviour of crystal are updated at the end of each increment. Two user subroutines VUMAT are developed, respectively, for face-centred cubic and hexagonal close packed alloys due to different deformation mechanisms. Earing behaviours of aluminium sheet and AZ31 alloy sheet are simulated for model validation.

Constitutive relationship of irradiated metallic materials by Eshelby formalism and micro-mechanical scheme

2016 ◽  
Vol 01 (03n04) ◽  
pp. 1640006 ◽  
Author(s):  
Long Yu ◽  
Lirong Chen ◽  
Xiazi Xiao ◽  
Qianying Chen ◽  
Huiling Duan
Keyword(s):  
Crystal Plasticity ◽  
Theoretical Framework ◽  
Constitutive Relationship ◽  
Plasticity Model ◽  
Metallic Materials ◽  
Mechanical Behaviors ◽  
Mechanical Method ◽  
Rate Dependent ◽  
Crystal Plasticity Model ◽  
Individual Grains

In this paper, a theoretical framework including the micro-mechanical method and crystal plasticity model is developed to characterize the macroscopic mechanical behaviors of irradiated metallic materials. At the microscale, a rate-dependent crystal plasticity model is applied to capture the effects of irradiation-induced defects and helium (He) bubbles for individual grains. Then, the micro-mechanical method is adopted to establish the relationship between microscopic individual grains and macroscopic polycrystals. The developed theoretical framework is applied to simulate the mechanical behaviors of neutron irradiated polycrystalline Cu and He implanted Cu/Nb nano-metallic-multilayers (NMMs), and the numerical results match well with corresponding experimental data.

Multi-level direct crystal plasticity model of polycrystalline specimen: Grains generation

2021 ◽  
Author(s):  
Artyom A. Tokarev ◽  
Anton Yu. Yants ◽  
Alexey I. Shveykin ◽  
Nikita S. Kondratiev
Keyword(s):  
Crystal Plasticity ◽  
Plasticity Model ◽  
Polycrystalline Specimen ◽  
Crystal Plasticity Model ◽  
Multi Level

Crystal Plasticity Predictions of Forward-Reverse Simple Shear Flow Stress

2011 ◽  
Vol 702-703 ◽  
pp. 204-207 ◽  
Author(s):  
Young Ung Jeong ◽  
Frédéric Barlat ◽  
Myoung Gyu Lee
Keyword(s):  
Flow Stress ◽  
Crystal Plasticity ◽  
Simple Shear ◽  
Bauschinger Effect ◽  
Texture Evolution ◽  
Simple Shear Flow ◽  
Plasticity Model ◽  
Lower Yield Stress ◽  
Crystal Plasticity Model ◽  
Stress Reversals

The flow stress behavior of a bake-hardenable steel during a few simple shear cycles is investigated using a crystal plasticity model. The simple shear test provides a stable way to reverse the loading direction. Stress reversals were accompanied with a lower yield stress, i.e., the Bauschinger effect, followed by a transient hardening stage with a plateau region and, permanent softening. The origins of these three distinct stages are discussed using a crystal plasticity model. To this end, the representative discrete grain set is tuned to capture such behavior by coupling slip system hardening appropriately. The simulated results are compared with experimental forward-reverse simple shear stress-strain curves. It is shown that the characteristic flow stress stages are linked to texture evolution and to the Bauschinger effect acting on the different slip systems.

scholarly journals Crystal Plasticity Model of Reactor Pressure Vessel Embrittlement in GRIZZLY

2015 ◽  
Author(s):  
Pritam Chakraborty ◽  
Suleyman Bulent Biner ◽  
Yongfeng Zhang ◽  
Benjamin Whiting Spencer
Keyword(s):  
Crystal Plasticity ◽  
Pressure Vessel ◽  
Reactor Pressure Vessel ◽  
Plasticity Model ◽  
Crystal Plasticity Model ◽  
Reactor Pressure
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