scholarly journals FE simulation on kink band formation of magnesium-based LPSO phase using dislocation-crystal plasticity model based on higher-order stress theory

2020 ◽  
Vol 70 (5) ◽  
pp. 204-211
Author(s):  
Kazuyuki Shizawa
Keyword(s):  
Crystal Plasticity ◽  
Fe Simulation ◽  
Kink Band ◽  
Higher Order ◽  
Plasticity Model ◽  
Band Formation ◽  
Stress Theory ◽  
Lpso Phase ◽  
Crystal Plasticity Model ◽  
Order Stress

A Dislocation-Based Crystal Plasticity Simulation on Kink Band Formation and Evolution in Polycrystalline Mg Alloy with LPSO Phase

2014 ◽  
Vol 626 ◽  
pp. 281-286 ◽  
Author(s):  
Ryo Ueta ◽  
Kazuyuki Shizawa
Keyword(s):  
Crystal Plasticity ◽  
Three Dimensional ◽  
Kink Band ◽  
Mg Alloy ◽  
Shear Stresses ◽  
Band Formation ◽  
Polycrystalline Specimen ◽  
Lpso Phase ◽  
Crystal Plasticity Model ◽  
Formation And Evolution

A three-dimensional compression analysis is performed by finite element method using a dislocation-based crystal plasticity model to clarify the formation mechanism of kink band in a polycrystalline Mg alloy with a long-period stacking ordered structure (LPSO) phase. The crystalline structure of LPSO phase is regarded as a HCP for simplicity, however, any deformation twinning is not taken into account. In addition, the activities of non-basal systems are considerably limited in the LPSO phase setting the values of their critical resolved shear stresses to large ones. We analyze a simple polycrystalline specimen composed of two α-Mg matrix phases and a LPSO phase both having a rectangular shape and twist grain boundaries are introduced into the interface. The obtained result shows that the kink band formation in the alloy is accomplished by the basal slips with different variants and the non-basal slips are activated on the grain boundary to maintain the continuity of deformation.

Meshfree Analysis of Higher-Order Gradient Crystal Plasticity Using Nodal Integration

2019 ◽  
Vol 794 ◽  
pp. 214-219
Author(s):  
Tota Niiro ◽  
Yuichi Tadano
Keyword(s):  
Size Effect ◽  
Crystal Plasticity ◽  
Meshfree Method ◽  
Higher Order ◽  
Integration Scheme ◽  
Plasticity Model ◽  
The Finite Element Method ◽  
Nodal Integration ◽  
Crystal Plasticity Model ◽  
Meshfree Analysis

The size effect of metallic materials is one of the important factors for understanding characteristics of material. The higher-order gradient crystal plasticity is a powerful model for describing the size effect. However, it is known that the finite element method sometimes provides an improper solution. In this study, we analyze the higher-order gradient crystal plasticity model using a meshfree method, and a nodal integration scheme is introduced to improve the analysis accuracy. The effectiveness and stability of the meshfree method for the higher-order gradient crystal plasticity model are quantitatively discussed.

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