Shear modulus:
End cap tab shear stress
End cap tab
bearing stress
Groove tab shear stress
Von Mises Stress:
Margin of Safety
Shell
Plate Constant:
Von Mises Stress calculation:
Q.a is shear stress at a
End Cap:
Margin of safety:
Change in height:
Radial displacement
of circumference:
check small deflection assumption (deflection < t/2)
Diametral clearance (extrusion gap):
Extrusion gap (radial):
Table 24
This file corresponds to Cases 2a - 2d in Roark's Formulas for Stress and Strain.
Annular plate with a uniformly distributed pressure q over the portion from r o to a
Outer edge simply supported, inner edge free
Outer radius:
Inner radius:
For the expressions in the case to be valid, the following condition must be true (i.e., condition = 1):
check small deflection assumption (deflection < t/2)
The critical pressure for the initial buckling of a cylinder
number of lobes:
EndCap Flange/Case Bearing Stress:
Where experimental values of pcritical are +/- 20% of pmin !!!
Table 35 Formulas for elastic stability of plates and shells
EndCap Flange Shear Thru Stress
Thin walled circular tube under uniform longitudinal compression
Notation file
Provides a description of Table 35 and the notation used.
Enter dimensions and properties:
Radius of curvature of tube:
Tube thickness:
Note: The ratio r/t must be greater than 10 for this document to be valid.
Calculation procedure:
The critical bending stress is defined by the equation below:
Most accurate for very long tubes, but applicable if length is several times as great as
which is the length of a half-wave of buckling. Tests indicate an actual buckling strength of from 40 to 60% of this theoretical value, or approximately
References:
Ref. 6.
Ref. 12.
Ref. 13.
Ref. 24.
End of Section
NASA
Honbun Eq. 2.2
Timoshenko strength of materials part 2 page 189
Superposition of pressure loading of the annulus and line loading of the connector/penetrator hole in the center.
CONNECTOR LINE LOAD:
Table 24
This file corresponds to Cases 1a - 1d in Roark's Formulas for Stress and Strain.
Annular plate with a uniform annular line load w at a radius r o
Outer edge simply supported, inner edge free
Area of Connector:
Force on the connector:
Line load on Conn. Hole (w):
By Superposition:
Margin:
For a conservative approach, assume the outer edge of the tabs are free and the inner edge fixed
Case 1l:
Loading on tab:
Margin:
Case 1l:
For o-ring tab:
Loading on tab:
Margin:
1. Case Weight Calc.:
Cylinder:
cross sectional area:
internal volume:
external volume:
weight:
End Cap:
volume:
Tab:
Plug:
Cap:
Weight:
Total Weight: