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Introduction

A brief description of the example.
*CONTROL_SHELL
Hemispherical Load
LS-DYNA Manual Section: *CONTROL_SHELL

Example: Hemispherical Load

Filename: control_shell.hemi-load.k

Description:
A spherical shell is subjected to outward point loads on the x-axis and inward
point loads on the z-axis.

Model:
The 1/8 symmetry model of a sphere measures 10 inches in radius with a
thickness of 0.04 inches. The model contains 48 shell elements. A force of one
pound is applied in the positive x -direction to the node on the x -axis.
A force of one pound is applied in the negative z-direction to the node on the
y-axis.

Input:
The element formulation is the Hughes-Liu shell with four integration points
through the thickness. Note: If B-T element formulation is used the solution
would be incorrect. To fix it, the Belytschko-Tsay shell requires the
Belytschko-Wang-Chiang warpage stiffness modification (*CONTRO L_SHELL).
The concentrated loads are applied to two nodes (*DEFINE_CURVE,
*LOAD_NODE_POINT).

Results:
The oscillation of the node on the z-axis shows a regular oscillatory behavior.
Since there is no specified damping, oscillations would be expected.

Reference:
Belytschko, T., Wang and Chiang.