Constitutive Model for Large Plastic Deformation of Nanocrystalline Materials

2011 ◽  
Vol 682 ◽  
pp. 139-144
Author(s):  
Hua Jiang ◽  
Jian Qiu Zhou ◽  
Rong Tao Zhu
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Constitutive Model ◽  
Nanocrystalline Materials ◽  
Metallic Materials ◽  
Large Plastic Deformation ◽  
Phase Mixture ◽  
Band Deformation ◽  
Softening Stage ◽  
Good Agreement

A constitutive model was presented for nanocrystalline metallic materials that can experience large plastic deformation with shear band. The model was composed of two parts for different deformation stage: hardening stage and softening stage. In the hardening stage, the phase mixture model was used, and in the softening stage, a shear band deformation mechanism was proposed. Based on the model presented, numerical simulations were carried out to prove that the predications kept in good agreement with experimental data.

Constitutive Modeling of Nanocrystalline Materials with Shear Band

2011 ◽  
Vol 311-313 ◽  
pp. 512-515
Author(s):  
Jian Qiu Zhou ◽  
Shu Zhang ◽  
Ying Wang
Keyword(s):  
Shear Band ◽  
Nanocrystalline Materials ◽  
The Finite Element Method ◽  
Calculation Results ◽  
Deformation Behaviors ◽  
Band Deformation ◽  
Two Phases ◽  
Softening Stage ◽  
Insight Into ◽  
Main Deformation

In hardening stage, a model was used to study the plastic deformation behaviors of nanocrystalline materials. The material was considered as a composite of grain interior phase and grain boundary (GB) phase. The constitutive equations of the two phases were determined in term of their main deformation mechanisms. In softening stage, a shear band deformation mechanism and the corresponding constitutive relation were presented. Calculation results have shown that the predications fit well with experimental data. The investigation using the finite-element method (FEM) provided a direct insight into quantifying shear localization effect in nanocrystalline materials.

Constitutive model for plastic deformation of nanocrystalline materials with shear band

Meccanica ◽  
2012 ◽  
Vol 48 (1) ◽  
pp. 175-185 ◽  
Author(s):  
Shu Zhang ◽  
Ying Wang ◽  
Hua Jiang ◽  
Jianqiu Zhou
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Constitutive Model ◽  
Nanocrystalline Materials

scholarly journals Experimental and Numerical Analysis of Expanded Pipe using Rigid Conical Shape

2018 ◽  
Vol 24 (8) ◽  
pp. 106
Author(s):  
Ahmed Ibrahim Razooqi
Keyword(s):  
Plastic Deformation ◽  
Finite Element ◽  
Numerical Analysis ◽  
Expansion Ratio ◽  
Large Plastic Deformation ◽  
Expansion Process ◽  
Finite Element Software ◽  
Conical Shape ◽  
Expansion Force ◽  
Good Agreement

The experimental and numerical analysis was performed on pipes suffering large plastic deformation through expanding them using rigid conical shaped mandrels, with three different cone angles (15◦, 25◦, 35◦) and diameters (15, 17, 20) mm. The experimental test for the strain results investigated the expanded areas. A numerical solution of the pipes expansion process was also investigated using the commercial finite element software ANSYS. The strains were measured for each case experimentally by stamping the mesh on the pipe after expanding, then compared with Ansys results. No cracks were generated during the process with the selected angles. It can be concluded that the strain decreased with greater angles of conical shape and an increase in expansion ratio results in an increase of expansion force and a decrease in the pipe thickness and length resulting in pipe thinning and shortening. Good agreement is evident between experimental and ANSYS results within discrepancy (16.90017%) in the X direction and (27.68698%) in the Y direction. Also, the stress distribution is investigated and it can be concluded that the case of Diameter (Do cone) = 35mm and (A) = α = 15° is the optimum.  

Simulation of the Energy Balance in Metals under Irreversible Deformation

2015 ◽  
Vol 243 ◽  
pp. 43-50 ◽  
Author(s):  
Anastasiia A. Kostina ◽  
Oleg A. Plekhov
Keyword(s):  
Experimental Data ◽  
Numerical Simulation ◽  
Plastic Deformation ◽  
Energy Storage ◽  
Energy Balance ◽  
Constitutive Model ◽  
Theoretical Result ◽  
Stored Energy ◽  
Storage Rate ◽  
Good Agreement

This work is devoted to the development of a constitutive model for the simulation of dissipated and stored energy evolutions under irreversible (plastic) deformation of metals. The efficiency of the model was demonstrated by the calculation of the energy balance in 304(L) austenitic steel under quasistatic deformation. The results of the numerical simulation are in a good agreement with the experimental data. The additional theoretical result of the study has established (based on the numerical and experimental data) a correlation between energy storage rate and rate of strain hardening.

Shear band evolution during large plastic deformation of brittle and ductile metallic glasses

2010 ◽  
Vol 90 (8) ◽  
pp. 573-579 ◽  
Author(s):  
J.W. Cui ◽  
R.T. Qu ◽  
F.F. Wu ◽  
Z.F. Zhang ◽  
B.L. Shen ◽  
...  
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Metallic Glasses ◽  
Large Plastic Deformation

Strength and Plastic Deformation Behavior of Nano-Scale Au/Cu and Cr/Cu Multilayers

2008 ◽  
Vol 41-42 ◽  
pp. 3-8 ◽  
Author(s):  
Y.P. Li ◽  
G.P. Zhang ◽  
Z.G. Wang
Keyword(s):  
Plastic Deformation ◽  
Shear Band ◽  
Layer Structure ◽  
Individual Layer ◽  
Nano Scale ◽  
Dislocation Plasticity ◽  
Plastic Deformation Behavior ◽  
Deformation Behaviors ◽  
The Difference ◽  
Band Deformation

Nano-scale Au/Cu multilayers were investigated by nano/microindentation. It was found that the hardness of the multilayers increases with decreasing individual layer thickness (λ), and shear band deformation can occur more easily in the multilayer with small λ. For comparison, the same experiments were also performed on Cr/Cu multilayers with the same layer structure. The results show that the Cr/Cu multilayer can be more effective in resisting shear band deformation than the Au/Cu multilayer. Finally, the λ dependence of shear band deformation and the difference between plastic deformation behaviors of the two multilayers were analyzed based on dislocation plasticity.

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