On the determination of the stress-strain curve of clay from the undrained plane-strain expansion of hollow cylinders: a long-forgotten method

1998 ◽  
Vol 35 (2) ◽  
pp. 360-363 ◽  
Author(s):  
V Silvestri
Keyword(s):  
Shear Stress ◽  
Plane Strain ◽  
Hollow Cylinder ◽  
Strain Curve ◽  
Outer Radius ◽  
Triaxial Tests ◽  
Inner Radius ◽  
Stress Curve ◽  
Hollow Cylinders

This paper presents the method to obtain the shear stress curve of clay from the undrained plane-strain expansion of hollow cylinder triaxial tests. No prior knowledge of the constitutive properties of the material is required. The theory also indicates that when the outer radius of the cylinder is very large compared with the inner radius, the equation used to interpret pressuremeter tests in clay is recovered.Key words: hollow cylinder, expansion tests, clays, plane strain, undrained condition, shear stress curve.

Small-angle X-ray scattering and light scattering study of hybrid nanoparticles composed of thermoresponsive triblock copolymer F127 and thermoresponsive statistical polyoxazolines with hydrophobic moieties

2013 ◽  
Vol 46 (6) ◽  
pp. 1690-1698 ◽  
Author(s):  
Anna Bogomolova ◽  
Martin Hruby ◽  
Jiri Panek ◽  
Maria Rabyk ◽  
Stuart Turner ◽  
...  
Keyword(s):  
Triblock Copolymer ◽  
Outer Radius ◽  
Hybrid Nanoparticles ◽  
X Ray ◽  
X Ray Scattering ◽  
Inner Radius ◽  
Molar Weight ◽  
Cloud Point Temperature ◽  
Scattering Study

A combination of new thermoresponsive statistical polyoxazolines, poly[(2-butyl-2-oxazoline)-stat-(2-isopropyl-2-oxazoline)] [pBuOx-co-piPrOx], with different hydrophobic moieties and F127 surfactant as a template system for the creation of thermosensitive nanoparticles for radionuclide delivery has recently been tested [Pánek, Filippov, Hrubý, Rabyk, Bogomolova, Kučka & Stěpánek (2012).Macromol. Rapid Commun.33, 1683–1689]. It was shown that the presence of the thermosensitive F127 triblock copolymer in solution reduces nanoparticle size and polydispersity. This article focuses on a determination of the internal structure and solution properties of the nanoparticles in the temperature range from 288 to 312 K. Here, it is demonstrated that below the cloud point temperature (CPT) the polyoxazolines and F127 form complexes that co-exist in solution with single F127 molecules and large aggregates. When the temperature is raised above the CPT, nanoparticles composed of polyoxazolines and F127 are predominant in solution. These nanoparticles could be described by a spherical shell model. It was found that the molar weight and hydrophobicity of the polymer do not influence the size of the outer radius and only slightly change the inner radius of the nanoparticles. At the same time, molar weight and hydrophobicity did affect the process of nanoparticle formation. In conclusion, poly(2-oxazoline) molecules are fully incorporated inside of F127 micelles, and this result is very promising for the successful application of such systems in radionuclide delivery.

Stresses in a Linear Incompressible Viscoelastic Cylinder With Moving Inner Boundary

1963 ◽  
Vol 30 (3) ◽  
pp. 335-341 ◽  
Author(s):  
M. Shinozuka
Keyword(s):  
Internal Pressure ◽  
Numerical Computation ◽  
Plane Strain ◽  
Hollow Cylinder ◽  
Digital Computer ◽  
Elastic Shell ◽  
Viscoelastic Cylinder ◽  
Stress Strain ◽  
Rate Of Increase ◽  
Inner Radius

A method is developed to find the stresses and strains in an incompressible viscoelastic hollow cylinder with moving inner radius contained by an elastic case and subject to internal pressure under the assumption of a state of plane strain. Stresses and strains are computed for a material with deviatoric stress-strain relations characteristic of a standard solid. The numerical computation is carried out with the aid of an IBM digital computer 1620 and is intended to illustrate the effects of the thickness of the cylinder, of the rate of increase of the internal pressure, and of the strength of the reinforcement provided by the elastic shell.

Anisotropy in Plastic Torsion

1972 ◽  
Vol 94 (1) ◽  
pp. 231-237 ◽  
Author(s):  
J. A. Bailey ◽  
S. L. Haas ◽  
K. C. Nawab
Keyword(s):  
Experimental Data ◽  
Shear Stress ◽  
Shear Strain ◽  
Yield Stress ◽  
Hollow Cylinder ◽  
Experimental Measurement ◽  
Tangential Strain ◽  
Yield Shear Stress ◽  
Hollow Cylinders ◽  
Von Mises

An analysis is presented which shows how the theory of anisotropy based on a von Mises criterion of yielding first proposed by Hill may be extended to the plastic torsional straining of a hollow cylinder. Expressions are given for the anisotropic parameters, and the yield stresses along the anisotropic axes in terms of certain quantities, namely; the change in axial and tangential strain with shear strain, the principal yield shear stress, and the through thickness yield stress of the hollow cylinder. Experimental measurement of these quantities is made for the plastic torsional straining of hollow cylinders of A1-1100. Experimental data are analyzed using the previously derived expressions, and the anisotropic parameters, and yield stresses along the anisotropic axes determined. Finally, the results of the investigation are discussed, and conclusions drawn.

scholarly journals Vibrations in a Fluid-Loaded Poroelastic Hollow Cylinder Surrounded by a Fluid in Plane-Strain Form

2013 ◽  
Vol 18 (1) ◽  
pp. 189-216 ◽  
Author(s):  
B. Shanker ◽  
C.N. Nath ◽  
S.A. Shah ◽  
P.M. Reddy
Keyword(s):  
Wave Propagation ◽  
Plane Strain ◽  
Hollow Cylinder ◽  
Impervious Surface ◽  
Frequency Equation ◽  
Solid Cylinder ◽  
Axially Symmetric ◽  
The Core ◽  
Poroelastic Media ◽  
Inner Radius

Plane-strain vibrations in a fluid-loaded poroelastic hollow cylinder surrounded by a fluid are investigated employing Biot’s theory of wave propagation in poroelastic media. The poroelastic hollow cylinder is homogeneous and isotropic, while the inner and outer fluids are homogeneous, isotropic and inviscid. The frequency equation of the fluid-loaded poroelastic cylinder surrounded by a fluid is obtained along with several particular cases, namely, fluid-loaded poroelastic cylinder, fluid-loaded bore, poroelastic cylinder surrounded by a fluid and poroelastic solid cylinder submerged in a fluid. The frequency equations are obtained for axially symmetric, flexural and anti-symmetric vibrations each for a pervious and an impervious surface. Nondimensional frequency for propagating modes is computed as a function of the ratio of thickness to the inner radius of the core. The results are presented graphically for two types of poroelastic cylinders and then discussed.

Reliability of thin-walled cylinder tests for elastic properties of anisotropic rocks

1996 ◽  
Vol 33 (6) ◽  
pp. 1008-1014 ◽  
Author(s):  
M L Talesnick
Keyword(s):  
Elastic Properties ◽  
Hollow Cylinder ◽  
Testing Procedure ◽  
Test Method ◽  
Material Parameters ◽  
Transverse Isotropic ◽  
Anisotropic Rocks ◽  
Hollow Cylinders ◽  
Thin Walled

Elastic properties of transverse isotropic rocks may be theoretically determined by subjecting a single hollow cylinder specimen to a set of two simple stress conditions. The reliability of the methodology is considered by testing both thin-walled hollow cylinders and thick-walled hollow cylinders. The results indicate that the testing procedure produces consistent material parameters, sample preparation does not seem to induce changes in the specimen behaviour, and that the assumptions implemented in the determination of the material parameters are reasonable. Key words: hollow cylinder, anisotropy, elasticity, test method.

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