Simulation of Crack Tip Plasticity Using 3D Crystal Plasticity Theory

2011 ◽  
Vol 291-294 ◽  
pp. 1057-1061
Author(s):  
Wen Hui Liu ◽  
Hao Huang ◽  
Zhi Gang Chen ◽  
Da Tian Cui
Keyword(s):  
Finite Element ◽  
Grain Boundary ◽  
Crystal Plasticity ◽  
Three Dimensional ◽  
Crack Tip ◽  
Plasticity Theory ◽  
Plastic Work ◽  
High Angle ◽  
Rate Dependent ◽  
Crystal Plasticity Theory

To investigate the plasticity distribution of microstructurally small crack tip in FCC crystals, the crack tip opening displacment(CTOD), crack tip plastic zone and maximum plastic work for stationary microstructurally small cracks were calculated with the three dimensional crystal plasticity finite element theory, which was implemented in the finite element code ABAQUS with the rate dependent crystal plasticity theory code as user material subroutine. Results show that crystallographic orientation has significant influence on CTOD and maximum plastic work. The CTOD and maximum plastic work in hard orientation are larger than that in soft orientaion under the displacement controlled boundary condition, which means that crack in hard orientation is more likely to extend than that in soft orientaion. The high-angle grain boundary shows a tendency to reduce crack extension, and the dislocation ahead of the crack tip becomes blocked by high-angle grain boundary.

Analysis of Slip-Band on Specimen Surface of Polycrystalline Copper under Tension

2011 ◽  
Vol 197-198 ◽  
pp. 1368-1373
Author(s):  
Yan Ke Shi ◽  
Ke Shi Zhang ◽  
Jing Zhang ◽  
Ying Song Ma
Keyword(s):  
Slip Band ◽  
Crystal Plasticity ◽  
Geometric Analysis ◽  
Three Dimensional ◽  
Plasticity Theory ◽  
Specimen Surface ◽  
Polycrystalline Copper ◽  
Polycrystalline Specimen ◽  
Crystallographic Slip ◽  
Crystal Plasticity Theory

Based on the crystal plasticity theory, the slip-band traces on the specimen surface of polycrystalline copper tensioned uniaxially are investigated by using the finite deformation numerical algorithm, and the statistical distributions of the inhomogeneous strain and stress in the specimen are analyzed. The tension deformation of the polycrystalline specimen is simulated by the three dimensional FEM. Through the geometric analysis of intersect-lines between the active crystallographic slip-planes and the specimen surface, the different slip-band traces of the specimen surface are calculated and discussed. According to the results, it is confirmed that the crystal plasticity theory is feasible to study the deformation of the crystalline material.

Crystal Plasticity Finite Element Simulation of Aluminium Deformation

2020 ◽  
Vol 1001 ◽  
pp. 127-132
Author(s):  
Hong Yang Li ◽  
Song Yu ◽  
Jian Hui Li
Keyword(s):  
Finite Element ◽  
Crystal Plasticity ◽  
Strain Distribution ◽  
Plasticity Theory ◽  
Material Behavior ◽  
Stress And Strain ◽  
Crystal Plasticity Finite Element ◽  
Element Simulation ◽  
Crystal Plasticity Theory ◽  
Stress And Strain Distribution

Crystal plasticity deformation of aluminium plays an important role on the investigation of macro deformation. In this paper, to discuss the effect ot crystal plasticity on the aluminium material behavior, crystal plasticity theory and macro finite element was combined together. The basic theory of crystal plasticity and finite element was introduce and the simulation result of aluminium was given. The stress and strain distribution was discussed and the efficient of the method was shown. It is shown that the orientation of the material and other micro character of the materials all influence the plasticity behavior of the material greatly.

Boundary Element Crystal Plasticity Method

2017 ◽  
Vol 08 (03n04) ◽  
pp. 1740003
Author(s):  
Ivano Benedetti ◽  
Vincenzo Gulizzi ◽  
Vincenzo Mallardo
Keyword(s):  
Grain Boundary ◽  
Boundary Element ◽  
Crystal Plasticity ◽  
Boundary Integral Equations ◽  
Voronoi Tessellation ◽  
Three Dimensional ◽  
Boundary Integral ◽  
Integral Approach ◽  
Rate Dependent ◽  
Individual Grains

A three-dimensional (3D) boundary element method for small strains crystal plasticity is described. The method, developed for polycrystalline aggregates, makes use of a set of boundary integral equations for modeling the individual grains, which are represented as anisotropic elasto-plastic domains. Crystal plasticity is modeled using an initial strains boundary integral approach. The integration of strongly singular volume integrals in the anisotropic elasto-plastic grain-boundary equations are discussed. Voronoi-tessellation micro-morphologies are discretized using nonstructured boundary and volume meshes. A grain-boundary incremental/iterative algorithm, with rate-dependent flow and hardening rules, is developed and discussed. The method has been assessed through several numerical simulations, which confirm robustness and accuracy.

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