Behaviour of paraboloid of revolution shell using cross-ply and anti-symmetric angle-ply laminates

Combination of electric and magnetic forces on charged molecules of flowing fluid in the presence of a significant electromagnetic fields on surfaces with a nonuniform thickness (as in the case of upper pointed surface of an aircraft and bonnet of a car which are examples of upper horizontal surfaces of a paraboloid of revolution—uhspr) is inevitable. In this study, the influence of imposed magnetic field and Hall effects on the flow of 29 nm CuO–water nanofluid over such object is presented. Suitable similarity variables were employed to nondimensionalize and parameterize the dimensional governing equation. The numerical solutions of the corresponding boundary value problem were obtained using Runge–Kutta fourth-order integration scheme along with shooting technique. The domain of cross-flow velocity can be highly suppressed when the magnitude of imposed magnetic strength and that of Hall parameter are large. A significant increase in the cross-flow velocity gradient near an upper horizontal surface of the paraboloid of revolution is guaranteed with an increase in the Hall parameter. Enhancement of temperature distribution across the flow is apparent due to an increase in the volume fraction.

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Effect of Matrix Cracking on Mechanical Properties in FRP Angle-Ply Laminates

The Proceedings of the Materials and Mechanics Conference ◽

10.1299/jsmemm.2017.os1014 ◽

2017 ◽

Vol 2017 (0) ◽

pp. OS1014

Author(s):

M.J. Mohammad FIKRY ◽

Ryuta KITAMURA ◽

Shinji OGIHARA

Keyword(s):

Mechanical Properties ◽

Matrix Cracking ◽

Angle Ply Laminates

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Geometric nonlinear analysis of thin elastic paraboloid of revolution shaped shells with radial waves

RUDN Journal of Engineering Researches ◽

10.22363/2312-8143-2020-21-3-208-214 ◽

2020 ◽

Vol 21 (3) ◽

pp. 208-214

Author(s):

Mathieu Gil-oulbé ◽

Aleksey S. Markovich ◽

Prosper Ngandu ◽

Svetlana V. Anosova

Keyword(s):

Sheet Material ◽

Outer Radius ◽

Contact Boundary ◽

Load Parameter ◽

Spatial Form ◽

Structural Behaviour ◽

Inner Radius ◽

Paraboloid Of Revolution ◽

Different Types ◽

Loaded State

From the old ancient types of roof and dome construction, various forms of shells have been discovered which attract special attention. A shell is a structure composed of sheet material so that the curvature plays an important role in the structural behaviour, realizing its spatial form. There are different types of shells, namely thick and thin shells. G. Brankov, S.N. Krivoshapko, V.N. Ivanov, and V.A. Romanova made interesting researches of shells in the form of umbrella and umbrella-type surfaces. The term nonlinear refers to a given structure undergoing a change in stiffness in its loaded state. There are basically three different types of nonlinearities: geometric, physical and contact (boundary condition nonlinearity). For further analysis of the stress-strain state, a paraboloid with an inner radius of 4 m and an outer radius of 20 m and the number of waves equal to 6 was considered. The test shell is made of reinforced concrete. The minimum load parameter at which the shell loses stability indicates a more than three times the margin.

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