Vibrations of a hollow cylinder from composite material under the action of an impulsive internal pressure

1989 ◽  
Vol 25 (7) ◽  
pp. 655-661
Author(s):  
Ya. Ya. Rushchitskii ◽  
B. B. �rgashev
Keyword(s):  
Composite Material ◽  
Internal Pressure ◽  
Hollow Cylinder

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.

Application of Discrete Element Modeling Techniques to Predict the Complex Modulus of Asphalt–Aggregate Hollow Cylinders Subjected to Internal Pressure

2005 ◽  
Vol 1929 (1) ◽  
pp. 218-226 ◽  
Author(s):  
Zhanping You ◽  
William G. Buttlar
Keyword(s):  
Internal Pressure ◽  
Hollow Cylinder ◽  
Asphalt Concrete ◽  
Complex Modulus ◽  
Discrete Element ◽  
Coarse Grained ◽  
Two Dimensional ◽  
Discrete Element Modeling ◽  
Discrete Elements ◽  
Element Modeling

An extension of the discrete element modeling (DEM) approach, or clustered DEM, was used to simulate the hollow cylinder tensile (HCT) test, in which various material phases (e.g., aggregates, mastic) are modeled with bonded clusters of discrete elements. The basic principle of the HCT test is the application of internal pressure to the inner cavity of a hollow cylinder specimen, which produces circumferential strain. In the present study an experimental program was conducted to measure the complex modulus of asphalt concrete mixtures at various loading rates and temperatures. The HCT test was then modeled with a two-dimensional, linear elastic DEM simulation. The current approach uses the correspondence principle to bridge between the elastic simulation and viscoelastic response. The two-dimensional morphology of the asphalt concrete mixture was captured with a high-resolution scanner, enhanced with image-processing techniques, and reconstructed into an assembly of discrete elements. The mixture complex moduli predicted in the HCT simulations were found to be in good agreement with experimental measurements across a range of test temperatures and loading frequencies for the coarse-grained mixtures investigated. Ongoing work in the area of viscoelastic constitutive modeling, fracture modeling, and three-dimensional tomography and modeling will extend the capabilities of this promising technique for fundamental studies of asphalt concrete and other particulate composites.

Reinforcing Large Diameter Elbows Using Composite Materials Subjected to Extreme Bending and Internal Pressure Loading

2016 ◽  
Author(s):  
Chris Alexander ◽  
Richard Kania ◽  
Joe Zhou ◽  
Brent Vyvial ◽  
Ashwin Iyer
Keyword(s):  
Finite Element ◽  
Composite Material ◽  
Composite Materials ◽  
Internal Pressure ◽  
Epoxy Composite ◽  
Large Diameter ◽  
Burst Pressure ◽  
Pressure Loading ◽  
Bending Loads ◽  
Design Guidance

A study was conducted to evaluate the use of E-glass/epoxy composite materials for reinforcement of large-diameter elbows. Using a combination of sub-scale and full-scale testing, the study demonstrated that when properly designed and installed, composite materials can be used to reduce strain in reinforced elbows considering bending loads of up to 3.6 million ft-lbs (4.88 million N-m), cyclic pressures between 720 psi (4.96 MPa) and 1,440 psi (9.93 MPa), and burst testing. The stresses measured in the composite material were well below designated ASME PCC-2 design stresses for the composite materials. During testing, there was no evidence that previously applied bending loads reduced the overall burst pressure capacity of the composite-reinforced elbows. Finite element modeling was used to optimize the geometry of the composite reinforcement. The resulting design guidance from this study was used to provide direction for possible reinforcement of large-diameter elbows for in-service pipelines.

Stress Analysis and Weight Savings of Internally Pressurized Composite-Jacketed Isotropic Cylinders

1990 ◽  
Vol 112 (4) ◽  
pp. 397-403 ◽  
Author(s):  
M. D. Witherell ◽  
M. A. Scavullo
Keyword(s):  
Experimental Study ◽  
Composite Material ◽  
Internal Pressure ◽  
Stress Analysis ◽  
Outer Diameter ◽  
Hoop Strain ◽  
Isotropic Cylinder ◽  
Orthotropic Composite Material ◽  
Compound Cylinder ◽  
Cylindrically Orthotropic

An isotropic cylinder designed to have a specific bore displacement per unit of internal pressure can be made lighter by removing material from the outer diameter and replacing it with the correct amount of a stiff lightweight composite material. A stress solution is presented for an internally pressurized compound cylinder constructed from an isotropic liner jacketed with a cylindrically orthotropic composite material. The solution is used to determine the set of compound cylinder geometries which have equivalent bore hoop strain to that of an isotropic monoblock cylinder. An equation for predicting the equivalent compound cylinder geometry which provides the maximum possible weight savings over the isotropic design is also presented. To verify the theory, an experimental study was conducted involving the measurement of bore strain for internally pressurized steel liners jacketed with a graphite bismaleimide composite.

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