Solution for Second-Moment Reliability Index
This paper presents a general method for determination of the magnitude of the second-moment reliability index in a probabilistic design procedure. The minimum distance from the origin...

Added Mass of Sphere Starting Upward Near Floor
A method for suddenly releasing a buoyant sphere under water and measuring its acceleration was used to get experimental added-mass coefficients a short time after release. To show the...

Subroutine for Settling Velocities of Spheres
Numerous engineering studies require the settling velocity of particles in quiescent water. The problem is complicated by having to determine the Reynolds number-drag coefficient relationship...

Channel Flow Over Permeable Beds of Graded Spheres
Tests were carried out to determine the velocity distribution and the hydraulic roughness in flows over 20 permeable beds made up of different sizes and gradings of spherical particles....

Concrete Properties at Ocean Depths
The results of three studies are reported herein on seawater absorption and compressive strength of 6-in. x 12-in. (152-mm x 305-mm) concrete control cylinders subjected to simulated ocean...

Stresses in Anisotropic Nonhomogeneous Sphere
The influence of modulus variations on propellant grain stress distribution deserves attention as the modulus variability generally leads to a significant structural improvement. Taking...

Motion of Sphere Rising in Turbulent Flow
This paper presents new and corrected data on the critical shear stresses required to initiate erosion as a function of type and amount of clay, pore and eroding fluid composition, and...

Minority Employment—A Job for ASCE
It is suggested that engineering has been a low priority concern of minority leaders, but that many minority individuals would find engineering a rewarding career. Further, if coming changes...

Accelerated Motion of a Spheroid in Viscous Fluid
The exact solution of the equation of motion of a spheroid accelerated along its axis of symmetry to an arbitrarily applied force in a viscous fluid of infinite extent is obtained. The...

Wave Forces on Submerged Objects of Symmetry
Stokes' linear irrotational wave theory is employed to obtain expressions for wave forces on submerged objects of symmetry, e.g., a hemisphere or a sphere, a horizontal halfcylinder...

Intersecting Titanium Spheres for Deep Submersibles
An evaluation of a bispherical pressure hull configuration and the investigation of the use of ceramics in pressure vessels is presented. A one-fourteenth scale model made of titanium...

Small Vibrations of Uniformly Compressed Isotropic Elastic Solids
The effect of uniform external pressure on the small amplitude vibration frequencies of solid isotropic elastic bodies is examined herein. Variation with pressure of small amplitude vibration...

Fluid Force Analysis and Accelerating Sphere Tests
An adequate expression for the fluid force on an accelerating body depends on whether the history of motion is repetitive. The conventional form for periodic motion consists of the sum...

Drag Coefficients in Nonsteady Turbulent Flow
Drag coefficients for spheres in nonsteady turbulent flow are found to be functions of the acceleration number, and either the particle Reynolds number or the relative turbulence intensity...

Fluid-Dynamic Consideration of Bottom Materials
Bottom materials often involve clay-water suspensions which evidence complex rheology. Studies of the non-Newtonian behavior of kaolin are reported herein. Concentric viscometer analysis...

Concrete Hulls for Undersea Applications
The experimental and analytical studies initiated at the Naval Civil Engineering Laboratory (NCEL) since 1964 have shown that concrete is not only a feasible but a desirable construction...

Dynamic Response of Submerged Sphere

Spherical Structural System in Fluid Media

Gravity and Surface-Load Stresses in Spheres
Stresses due to gravity are reported for a solid sphere and for a hollow sphere with an inner diameter one-half its outer diameter. The stresses were obtained using the freezing method...

Impact of Spheres on Ice
An oscilloscopic method for determining the coefficient of restitution, e, by impact of spheres on ice was developed. Teflon, acrylic, nylon,...

 

 

 

 

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