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9 THE CONCEPT OF MOMENTLESS
THEORY OF SHELLS. CALCULATION OF

THICK-CYLINDERОСНОСНІ ЕЕТИЧНІ
ВІДОМОСТІ
9.1 Momentless model of axisymmetrical thin-walled
shell

Recall that the shell is called the body, which is bounded by two
curved surfaces, the distance between them - the thickness of the
shell  - small compared to other dimensions of the body. We
consider the constant shell thickness (  const ).
The set of points that are equidistant from the front boundary
surfaces is called median surface. The thickness and shape of the
middle surface defining the geometry of the shell.
Thin-walled shells are called for which
ratio of thickness to the smallest radius of curvature of the surface
R is less than 1/20, i.e.,
min
 R  1 20.
min
If the median surface of the shell, obtained as the result of
rotation of the curve with respect to an axis, then this shell is

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