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Unformatted text preview: 3 m, are subjected to a surface charge. Find the resultant
electrostatic force between the spheres. Figure 51.1 Charged Spheres Problem Sketch Material Properties
ε = 8.854E-12 F/m Geometric Properties
r1 = 1.0 m
r2 = 3.0 m
r3 = 6.0 m
r4 = 1.25 m Loading
Surface charge = 8.854 E-12 C/m2 ANSYS Verification Manual . ANSYS Release 9.0 . 002114 . © SAS IP, Inc. 1–120 VM51 Analysis Assumptions and Modeling Notes
The finite element mesh and the infinite element mesh are generated from the solid model. A planar section of
the model is meshed with PLANE121 elements and rotated through 30 degrees. The 2-D mesh creates a 3-D
mesh of SOLID122 elements. SHELL93 elements are generated over the outer surface of the 3-D mesh and extruded
in the radial direction to complete the finite element domain. The process is repeated to extrude the INFIN111
mesh in the radial direction.
It can be assumed that a symmetry plane exists at Y = 0, at which a zero voltage constraint is imposed. Infinite
flags are set for the outer surface of the INFIN111...
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