Modeling of underground horizontal composite tank

© 2013 CADFEM CIS, ANSYS, Inc.1

Modeling of underground horizontal composite tank

Yury NovozhilovHead of HPC [email protected]

© 2013 CADFEM CIS, ANSYS, Inc.2

Creation FE model of underground horizontal composite tank in ANSYS Design Modeler, Composite PrePost, Mechanical

Parameterization of composite fibers stacking angles, properties of materials, the number of layers.

Linear buckling analysis and static structural analysis taking into account large displacements.

Objectives

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The properties of the soil

ρ = 1500 кг/м3 – soil density

g = 9,81 м/с2 – acceleration of gravity

h = [5,8 ; 7,6] м – depth is of the point from the mark-plan

ν = 0,3 – soil Poisson's ratio

С = 12 МН/м3 – elastic foundation stiffness for loose saturated sands

Tsinovitch N.A. (Цитович Н.А.) “Soil Mechanics”, 1983

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Geometry and dimensions

* Some dimensions are given with shell thickness of 6 mm taking into account

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Elastic foundation

Boundary conditions and loads

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Vertical component of pressure Pv = ρgh, Pa

Horizontal component of pressure Ph = ρghν/(1-ν), Pa

Ivanova P.L. (Иванова П.Л.) «Ground and foundation of hydraulic structures»

Boundary conditions and loads

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Horizontal component of pressure Ph = ρghν/(1-ν), Pa

Ivanova P.L. (Иванова П.Л.) «Ground and foundation of hydraulic structures»

Boundary conditions and loads

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Horizontal component of pressure Ph = ρghν/(1-ν), Pa

Ivanova P.L. (Иванова П.Л.) «Ground and foundation of hydraulic structures»

Boundary conditions and loads

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Thickness 6 - 10 mm

Winding angle 5 - 20°

4 - 6 monolayers of equal thickness

Main tube

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Caps Thickness 6 mm

Manual layout

3 layers of equal thickness: woven fiberglass cloth / mat / woven fiberglass

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PVC pipes and saddlePVC pipes

Thickness 4 mm

Isotropic elastic material

Saddle

Thickness 6 mm

Winding angle 15°

4 monolayers of equal thickness

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Reinforcements Thickness 6 мм

Manual layout

4 monolayers of equal thickness

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2nd order shell elements

95751 DOFs

31917 Nodes

31870 Elements

FE Mesh

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Buckling cross section mode (z = 1.8 m)

Linear buckling with 4 layer main tube

Load multiplier = 0.49 – not acceptable

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Buckling cross section mode (z = 1.8 m)

Linear buckling with 6 layer main tube

Load multiplier = 1.33 – acceptable

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Total deformation, |U|, m

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Normal stress in cylindrical CS, σy, Pa

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Model with 4 layer main tube• Load multiplier after the linear buckling analysis = 0.49 – not acceptable

Model with 6 layer main tube• Load multiplier after the linear buckling analysis = 1.33 – acceptable • Maximum of Total deformation is 54 mm• Normal stress in cylindrical CS σy = [-150 MPa; 136 MPa]

Results overview

© 2013 CADFEM CIS, ANSYS, Inc.19

Thank you for attention!

Yury NovozhilovHead of HPC [email protected]