scholarly journals Determination of Parameters of Johnson-Holmquist-II (JH-2) Constitutive Model for Red Sandstone

2021 ◽  
Vol 2002 (1) ◽  
pp. 012071
Author(s):  
Hongxin Huang ◽  
Wenbin Li ◽  
Zhenyu Lu
Keyword(s):  
Constitutive Model ◽  
Red Sandstone ◽  
Determination Of Parameters

Study on Statistical Damage Softening Constitutive Model and Determination of Parameters for Rock Based on Lognormal Distribution

2011 ◽  
Vol 69 ◽  
pp. 33-38
Author(s):  
Jian Hua Wen ◽  
Cui Ying Zhou ◽  
Li Huang ◽  
Ye Cheng ◽  
Lin Chong Huang ◽  
...  
Keyword(s):  
Constitutive Model ◽  
Lognormal Distribution ◽  
Strain Softening ◽  
Model Parameters ◽  
Kolmogorov Smirnov ◽  
Random Distributions ◽  
Determination Of Parameters ◽  
Smirnov Test ◽  
Statistical Damage

Based on the property that micro-cells strength is consistent with lognormal distribution function, this paper presented a new statistical damage softening constitutive model simulating the full process of strain softening for rock. Through discussing the characteristics of random distributions for rock micro-cells strength, lognormal distribution assumption is tested by Kolmogorov-Smirnov test in statistics, and the reasonable method of geometry boundary condition is selected to determine model parameters that can be easily applied to the situations under different complex conditions. Gabbro experiment comparative analyses show that the new damage softening constitutive model is rational and convenient in engineering.

DETERMINATION OF PARAMETERS OF STEINBERG-GUINAN CONSTITUTIVE MODEL WITH SHOCK WAVE EXPERIMENTS

2008 ◽  
Vol 22 (09n11) ◽  
pp. 1111-1116 ◽  
Author(s):  
JIANXIANG PENG ◽  
CHANGMING HU ◽  
YINGLEI LI ◽  
LIN ZHANG ◽  
FUQIAN JING
Keyword(s):  
Shock Wave ◽  
High Pressure ◽  
High Temperature ◽  
Yield Strength ◽  
Shear Modulus ◽  
Constitutive Model ◽  
Wave Profile ◽  
Determination Of Parameters ◽  
Derivatives Of

Steinberg-Guinan constitutive model is widely used in impact engineering simulations. Shock wave profile measurements of Al , Cu , and W under shock pressures ranging from 4 GPa to 200 GPa were analyzed, and shear modulus G and yield strength Y of these materials were obtained by using the high-pressure sonic velocities and rate independent Lagrange analysis results. Then values of derivatives of G and Y with respect to pressure or temperature at the reference state of these three metals were determined. By analyzing the pressure and temperature dependence of shear modulus and yield strength, we conclude that the relations of Steinberg-Guinan constitutive model, Y/G=constant, are approximately correct on Hugoniot state for these materials. So this is a probable approach to solve the difficulty of measurement of Y under high-pressure and high-temperature directly.

Determination of parameters of short circuit of power transformer by means of mathematical modeling

2017 ◽  
Vol 26 (102) ◽  
pp. 110-119
Author(s):  
D. S. Yarymbash, ◽  
◽  
S. T. Yarymbash, ◽  
T. E. Divchuk, ◽  
D. A. Litvinov
Keyword(s):  
Mathematical Modeling ◽  
Power Transformer ◽  
Short Circuit ◽  
Determination Of Parameters

Tests of jackhammers (formation of bench techniques)

2020 ◽  
pp. 28-32
Author(s):  
V.S. Vanaev
Keyword(s):  
Impact Energy ◽  
Bench Tests ◽  
Measuring Complex ◽  
Energy Indicators ◽  
Definition Of ◽  
Determination Of Parameters ◽  
Dynamic Indicators

Development of complex determination of parameters of jackhammers at bench tests is studied. The modern support of tests of jackhammers for the purpose of definition of their energy, vibration and noise indicators is considered. Descriptions of the SORP universal bench and UIPU measuring complex are given. Keywords jackhammer, bench, tests, processing object, energy indicators, impact energy, dynamic indicators [email protected]

Hydrogeology correction in the gravitational field from satellite data

2018 ◽  
Vol 931 (1) ◽  
pp. 2-7
Author(s):  
V.D. Jushkin ◽  
L.V. Zotov ◽  
O.A. Khrapenko
Keyword(s):  
Gravitational Field ◽  
Oil And Gas ◽  
Repeated Measurements ◽  
Geological Factors ◽  
Grace Satellite ◽  
Gas Pumping ◽  
Acceleration Of Gravity ◽  
Determination Of Parameters ◽  
Gravity Acceleration

The results of repeated measurements of the acceleration of gravity by the Russian absolute ballistic field gravimeter GABL-M on points of oil and gas deposits in the permafrost over a five year period are presented. The changes of gravity acceleration by the absolute gravimeter and GRACE satellite were compared. The results of comparisons of differences gravity acceleration by ballistic gravimeter GABL-M and relative Canadian gravimeters CG5 were [i]shown. The errors in determination of parameters of the gravitational field ballistic gravimeter GABL-M and CG5 gravimeters group were presented. The method of measurement with the gravimeter GABL-M and the method of determining the vertical gradients relative CG5 gravity meters was described. The necessity of introducing corrections of hydrogeology is caused by influence of hydro geological factors on the gravitational field in the permafrost. They are comparable with the values of the field change in the result of gas pumping.

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