Research on deep clay high pressure triaxial unloading and structural constitutive model

2010 ◽  
pp. 381-394
Author(s):  
Ruhua Sun ◽  
Wenping Li ◽  
Weili Wang
Keyword(s):  
High Pressure ◽  
Constitutive Model

Constitutive model and deformation microstructure of fine-grain Mg-Zn-Y alloy solidified under high pressure

2016 ◽  
Vol 34 (9) ◽  
pp. 945-951 ◽  
Author(s):  
Zhibin FAN ◽  
Xiaoping LIN ◽  
Yun DONG ◽  
Rui XU ◽  
Chan LI ◽  
...  
Keyword(s):  
High Pressure ◽  
Constitutive Model ◽  
Deformation Microstructure ◽  
Fine Grain

scholarly journals Elasto-plastic constitutive model for sand in low and high pressure.

1988 ◽  
pp. 11-20
Author(s):  
Hidekazu MURATA ◽  
Masayuki HYODO ◽  
Noriyuki YASUFUKU
Keyword(s):  
High Pressure ◽  
Constitutive Model

A multi-level damage and creep behaviour of material subjected to high pressure: metal versus composite – A micromechanics approach

2017 ◽  
Vol 233 (3) ◽  
pp. 772-786 ◽  
Author(s):  
VS Kathavate ◽  
DN Pawar ◽  
AS Adkine
Keyword(s):  
High Pressure ◽  
Composite Material ◽  
Constitutive Model ◽  
Creep Behaviour ◽  
Damage Model ◽  
The Past ◽  
Nonlinear Constitutive Model ◽  
Micromechanical Damage ◽  
Multi Level ◽  
Dependent Behaviour

This current study reports on multi-level damage and creep behaviour of metal and composite material under external high pressure using finite element concept. A fatigue damage model with microcracks with improper interface has been portrayed in the present investigation. In addition, the overall elastic properties and damage evaluation are also studied and comparative study of mechanical properties has been outlined. Further thermo-elastic creep response of materials based on Norton’s law is also presented. The results showed that the proposed nonlinear constitutive model and overall elastic damage behaviour of composite material are in agreement. Implemented nonlinear constitutive model is secured by comparing predicted stress–strain curves with experimental data available in the past literature under uniaxial tension. The time-dependent behaviour creep stresses and displacements are studied and plotted. The analysis provides significant new insights of micromechanical damage, creep and collapse behaviour of composite material. For the structural composites, some notable techniques have been developed over the past three decades; review of these techniques is also outlined here in this paper and state of art is established together with insights for upcoming development.

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.

High-pressure freezing of cells in suspension for low-voltage scanning electron microscopy (LVSEM)

1991 ◽  
Vol 49 ◽  
pp. 64-65
Author(s):  
Marek Malecki ◽  
James Pawley ◽  
Hans Ris
Keyword(s):  
Electron Microscopy ◽  
High Pressure ◽  
Low Voltage ◽  
Culture Media ◽  
Cell Structure ◽  
Freeze Substitution ◽  
Ice Crystal ◽  
High Pressure Freezing ◽  
Cell Culture Media ◽  
Voltage Scanning

The ultrastructure of cells suspended in physiological fluids or cell culture media can only be studied if the living processes are stopped while the cells remain in suspension. Attachment of living cells to carrier surfaces to facilitate further processing for electron microscopy produces a rapid reorganization of cell structure eradicating most traces of the structures present when the cells were in suspension. The structure of cells in suspension can be immobilized by either chemical fixation or, much faster, by rapid freezing (cryo-immobilization). The fixation speed is particularly important in studies of cell surface reorganization over time. High pressure freezing provides conditions where specimens up to 500μm thick can be frozen in milliseconds without ice crystal damage. This volume is sufficient for cells to remain in suspension until frozen. However, special procedures are needed to assure that the unattached cells are not lost during subsequent processing for LVSEM or HVEM using freeze-substitution or freeze drying. We recently developed such a procedure.

Prolonged Fixation Studies For Spaceflight

1973 ◽  
Vol 31 ◽  
pp. 332-333
Author(s):  
Robert Corbett ◽  
Delbert E. Philpott ◽  
Sam Black
Keyword(s):  
High Pressure ◽  
Living Systems ◽  
Prolonged Storage ◽  
Time Intervals ◽  
Early Signs ◽  
Large Numbers

Observation of subtle or early signs of change in spaceflight induced alterations on living systems require precise methods of sampling. In-flight analysis would be preferable but constraints of time, equipment, personnel and cost dictate the necessity for prolonged storage before retrieval. Because of this, various tissues have been stored in fixatives and combinations of fixatives and observed at various time intervals. High pressure and the effect of buffer alone have also been tried.Of the various tissues embedded, muscle, cartilage and liver, liver has been the most extensively studied because it contains large numbers of organelles common to all tissues (Fig. 1).

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