scholarly journals Investigation on the Plastic Strain Dependence of Dislocation Velocity Using Dislocation Velocity-Stress Exponent and Dislocation Velocity Coefficient

2020 ◽  
Vol 84 (10) ◽  
pp. 326-333
Author(s):  
Kota Ueno ◽  
Kodai Murasawa ◽  
Yurina Suzuki ◽  
Masato Takamura ◽  
Takayuki Hama ◽  
...  
Keyword(s):  
Plastic Strain ◽  
Stress Exponent ◽  
Dislocation Velocity ◽  
Strain Dependence ◽  
Velocity Coefficient

Determination of the internal stress and dislocation velocity stress exponent with indentation stress relaxation test

2008 ◽  
Vol 23 (9) ◽  
pp. 2486-2490 ◽  
Author(s):  
B.X. Xu ◽  
X.M. Wang ◽  
Z.F. Yue
Keyword(s):  
Stress Relaxation ◽  
Internal Stress ◽  
Stress Exponent ◽  
Indentation Test ◽  
Dislocation Velocity ◽  
Attractive Potential ◽  
Integral Constant ◽  
Properties Of Materials ◽  
Relaxation Curves

Indentation stress relaxation tests were carried out on high-purity polycrystalline copper specimens at room temperature with a flat cylindrical indenter. The experimental results showed that the resulting load-time relaxation curves can be described by a power law, which coupled an internal stress and an integral constant between the effective stress and relaxation time. Then the internal stress, integral constant, and dislocation velocity stress exponent can be extracted from load relaxation curves. The derived values from this way were consistent with the results of conventional uniaxial compression stress relaxation tests. These agreements are not only useful to understand deformation (dislocation) mechanisms under the indenter, but also exhibit an attractive potential of measuring nano/micromechanical properties of materials by indentation test.

An Interpretation of the Dislocation Velocity-Stress Exponent

1967 ◽  
Vol 22 (2) ◽  
pp. 607-616 ◽  
Author(s):  
K. R. Evans ◽  
D. J. Bailey ◽  
W. F. Flanagan
Keyword(s):  
Stress Exponent ◽  
Dislocation Velocity

A cyclic elasto-plastic constitutive model for sand considering a plastic-strain dependence of the shear modulus

Géotechnique ◽  
1999 ◽  
Vol 49 (5) ◽  
pp. 661-680 ◽  
Author(s):  
F. Oka ◽  
A. Yashima ◽  
A. Tateishi ◽  
Y. Taguchi ◽  
A. Yamashita
Keyword(s):  
Plastic Strain ◽  
Shear Modulus ◽  
Constitutive Model ◽  
Strain Dependence
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