Results 211 to 220 of about 75,244 (265)

Partially plastic thick-walled tubes

Journal of the Franklin Institute, 1948
Abstract A theory is presented for the partial plastic yielding of thick-walled cylindrical tubes acted upon by any combination of internal pressure, external pressure and end load when the material follows an arbitrary stress-strain law. The solution combines (a) the distortion energy theory of plastic flow and (b) the effects of elastic ...
C.W. MacGregor, Jr. L.F. Coffin, J.C. Fisher   +2 more
openaire   +1 more source

The Viscous Collapse of Thick-Walled Tubes

Journal of Applied Mechanics, 1983
The collapse of glass tubes, as used in the manufacture of optical fiber preforms, constitutes a problem involving Stokes flow, driven by surface tension and applied pressure. Undesirable, noncircular modes of deformation may grow or decay, depending on initial tube dimensions, radial viscosity variations, and the pressure differential across the tube ...
F. T. Geyling, K. L. Walker, R. Csencsits   +2 more
openaire   +1 more source

Flow-rate limitation in a uniform thin-walled collapsible tube, with comparison to a uniform thick-walled tube and a tube of tapering thickness

Journal of Fluids and Structures, 2003
Previous experiments on a tapered-thickness tube showed qualitatively different behaviour from that exhibited by a uniform thick-walled tube. To understand whether the taper or the thinner wall was responsible, similar aqueous flow-limitation experiments were conducted on a uniform thin-walled tube of the same material, with all other experimental set ...
C.D Bertram, N.S.J Elliott
openaire   +1 more source

Pressured-assisted injection forging of thick-walled tubes

International Journal of Machine Tools and Manufacture, 1995
Abstract Numerous engineering components may be created in a hollow form without detracting from their performance requirements; the difficulty, however, is in the conversion of tubular materials into such components. Hollow components may be formed from tubular materials if these can be prevented from collapsing during the forming cycle.
Balendra, Rajendram, Qin, Yi
openaire   +3 more sources

Controlling the wall thickness and composition of hollow precipitation tubes

Physical Chemistry Chemical Physics, 2011
We investigate the growth of self-organized tubes formed by injection of metal salt solutions into silicate solution. The wall thickness increases strictly in an inward direction and obeys square root functions suggesting the presence of a traveling reaction-diffusion front in the radial direction.
László, Roszol, Oliver, Steinbock
openaire   +2 more sources

Bifurcation of rotating thick-walled elastic tubes

Journal of the Mechanics and Physics of Solids, 1980
The deformation of a circular cylindrical elastic tube of finite wall thickness rotating about its axis is examined. A circular cylindrical deformed configuration is considered first, and the angular speed analysed as a function of an azimuthai deformation parameter at fixed axial extension for an arbitrary form of incompressible, isotropic elastic ...
Haughton, D. M., Ogden, R. W.
openaire   +1 more source

Finite creep deformations of thick-walled tubes

International Journal of Solids and Structures, 1974
Abstract As an application of the theory of finite deformations to creep problems, the steady-state creep of pressurized thick-walled tubes is analysed. Constitutive equations of steady-state creep in case of finite deformations are first derived by assuming the Prager-Drucker potential and Norton's law.
Murakami, Sumio, Ohno, Nobutada
openaire   +1 more source

Thermal stresses in a thick-walled tube

International Journal of Mechanical Sciences, 1965
Abstract Experiments are described in which pure resistance networks were used to determine, by analogy, the temperature and stress distributions in a long tube whose cross-section had a rectangular outer boundary and a central circular hole. It is shown that the electrical analogy method is valuable for the solution of thermal stress problems and ...
openaire   +1 more source

Creep Behavior of Thick-Walled Tubes

2002
The expansion of a long cylindrical tube by uniform internal pressure is an eternal problem because of its connection with the autofrettage of pressure vessels; the process has also been used to determine the influence of a stress gradient on the criterion of yielding. Therefore, many scientists have examined the problem.
openaire   +1 more source

Simultaneous measurement of sound velocity and wall thickness of a tube

Ultrasonics, 2001
A method for simultaneously measuring the sound propagation velocity and the thickness of each wall on the opposite sides of a tube is presented. The method uses a pair of ultrasound transducers to produce two reflected pulses from the outer and inner surfaces of the tube wall on the each side, and two transmitted pulses, one with and one without the ...
openaire   +2 more sources