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Unstiffened length for cylinder with head and cone

Cylinder with head and cone L cyl h L con α
Cylinder with head and cone

Values for calculation

$L_{cyl}$ $\mathrm{mm}$
$h$ $\mathrm{mm}$
$L_{con}$ $\mathrm{mm}$
$α$ $\mathrm{°}$

Calculation

Unsupported length of the shell

$\text{if }\ α\geq 30$
$$L=L_{cyl}+0.4\cdot h$$
$\text{else}$
$$L=L_{cyl}+0.4\cdot h+L_{con}$$