A Solution to the Inherent List on Nimitz Class Aircraft Carriers

Stress Calculations:
k = coefficient that depends on <strong>the</strong> plate edge conditions,
aspect ratio (AR) of <strong>the</strong> panel, and position of point being considered
o := kP- -
p = pressure based on 95% of maximum ballast addition I AW sponson stress calculations
^imply_supported
b = panel width
a = panel length
t = plate thickness
"^clamped •
k values are most conservative
a := 20ft
P = 5.558—
. 2
m
lb
^max_allowable= 40,000—
in
b := 58in
based on no stiffener addition
t := .75in
lAW with <strong>the</strong> General Specs (Section 100)
■^simply_supported • ^imply_supported
simply_supported 24931—
. 2
m
^clamped • Clamped
'^clamped =16621—
. 2
m
Maximum Allowable Stress for HTS is 40,000 psi. The calcuated stresses fall well below that of simply supported and that of
clamped. Simply supported and clamped structural cases are idealizations of structural member support illustrating zero stiffness
and infinite stiffness, nei<strong>the</strong>r of which exists in any real-world structural system. On board ship, structural systems can be
conveniently approximated by one or <strong>the</strong> o<strong>the</strong>r case, but in fact have stiffness between one or <strong>the</strong> o<strong>the</strong>r. Navy structural analysis
is based off clamped ends, <strong>the</strong>refore <strong>the</strong> stress should be well below maximum allowable.
"'clamped
''max_allowabl(
103