THE EFFECT OF AN UNDERWATER EXPLOSION ON THE HULL

• Document Type: CREST
• Collection: General CIA Records
• Document Number (FOIA) /ESDN (CREST): CIA-RDP82-00039R000200170012-9
• Release Decision: RIPPUB
• Original Classification: R
• Document Page Count: 26
• Document Creation Date: December 22, 2016
• Document Release Date: April 23, 2012
• Sequence Number: 12
• Publication Date: August 18, 1952
• Content Type: REPORT

Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
The Effect of an Unde ater
a~io__...~ the Uu
by Yu A. Shjmanskiy
Chap CamPutatban inShip.Construe
~
PP X 35$"~3b9, 'c Russian bk, 194
Lion, Chapter
STAT
STAT
Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
T'UE EFFECT OF AN I?II WA'1'IiJI~ 1 XPLOSTON OIL THE R!JLL
-
`the expcri~ca of naval wars bas shown that when underwater
Qxp1or ions o?' mines, torpedoes, and bombs occur at a 'y one area o1
the hull oi' a ship, the destruction of that area is often accompa~
niecl by the impairment of the general longitudinal stability o the
hull in another area. This impairment is manii'e;ted in the appearance
01' corrugation and rupturing oL' the desk, sides, and bottom along
a narrowly defined segment of the len~th of the hu1lp
This ph niomenon, which was first observed during the First
World War and later when the British minelayer Khan ter [Hunter? J
was sunk by a mine in 1937, was repeatedly observed dl'.ring World
War II in the case o1' both naval vessul.s and merchant ships which
were either sunk or dammed as a result of underwater explosions,
It is 'to be assumed, of course, that i.mpairrta~ b?; sub pot~d
the action oC underwatar e ~ to
pa,as~,cax~s,
In order to ostirr~a~,~ the genc~rc 1?fl 1tuc'in,a1 s tsb
a s}7ip t s hull from the point of View of re~.star~ce to ~
sxp1,ouio~7L, and to c~c~vt?~.o? lnc~erwate~
p rpeoff' constr!ac,t,~a11 whit}~ ~d
to incxi~aasinr 'l',he re~ , ?,, , ~~ can?
~~ ~ , ,~5 ?~4tinc~ o.~ 'Gl~a hu:t:~ to t}~G rlc;ti
llnt~C.t`Ws'~'~~;~,i e~," p;Lou r, , 111 4~'
7.onsa onto may propruna ~r,
p b~.to .: ,.. } , a"oJ,ution oi' the
ro rrt, making ccr I,,s,j.,n tenta?l,~.ve asp
ma ~ur~ipI;,io1~s w}~~ a`e,~a;rto the
~~flitude anci characi,?ar of the 1.ra;x;:i .,
~.n~~ o,n the }~ru:1:1. a?r, the ~?imP
of ?~hr?.; , ~~ ~ act,,
.tndc.,rwa~,er u?~ "p1~ , As a resu:~ t, the corm
U'tah' pu,ilakl~:~r~n of t~~.~;
stability of the hu1.l ar;aa.ns?L? the ,
actIari of unc}crwaj;sr Gxp1usion
acquires a terrtative char a~cter wh'
lrh, howevery do cos not rule out
a.ts practicaa. s~?~;nificance s~. ~
~ nce such c~,rnpuf~a~:~u,t1s are often a?
' ~
in shiphuildin.7 practice; p} J.~.~d
Le The load Which ar?(;s on the }1ui.1. at the ti.mF, of an cinde w
water exp1i()11 fluctuates in, time ancoi' r
~.~ d.?nto a ce'rtaa.n 1atq
a.ncroasix~g from zt,o to a maxi.,m
urns and then dacrc>asa,nF, to zero
,c,?;ai;n, In the course of a ccrta.i.n ? ~'
~a.rrir ~ ~~? The functian e
ing the load may be treated ~ xpressM
?~r~.~onarrletricrx11y and presented a. ,,
i'?Iiawin r in the
~, .Cc, rm.
where
frt1 s,M r,rrt
T dt.
Declassified in Part - Sanitized Copy Approved for Release 2012/04/23: CIA-RDP82-00039R000200170012-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
n ~ is unhnQW~ ~,. but
St~,o (` 1
a c~ l' c~ ir~ca the vaiu~ th unc
in t1;1,ven ~,~,sti~Imc~c~ only the fir a~t term
~aear .~~~r in mind tha~~ ~~m
.a?l"a,ra~Zt va1ue o~ this
the ser ie s con tams the anaiyti Cai1;Y
c.~
~;'unc?tiofl ?.. wCs aur(lF: that tl~e load acting or~ tie hull at the
time a~ an ur>,erwa~e ~ons ~i~u '~ c~t-u~'in t.~.me n~;cr)x?~1a.2~~ to
' ;~ c~~aJ,o;~
tht: equatt';)no
mcimum magnituCle o:' the load
whc,re
durat .on oi' the action o:C the load
,. , alosians a:11 such a lca.nd that
c~ns~.del~:c.m~~a uncl~ar~ra-,ez eX1
one may r~:~ke the asp>umption that
area Of the hull . l is destroyed, ?'me
the load which has acted, at the i~~.
the greatest man~,~? ,ude ox the entire r, emaimtia.n area o1' the hull,
of sucrm an. r;:,ci$
1.oaio n~ on ,,.?es t~. in
? r the re5stance of the hull to Grruct,on
~.s proportional to
the area o' the explosion. For the general staba.:l.1ty of the hu:l.;l.
~~.on the most unaV~rab:l.e hin.c3, of
outside tl~e area of the e~.;~los ~ ~~ the
tales place at one of the extrerTm'.ta.es o
cxp :l.ca;;~,~an is o~Ye which ~.s the
de he x educed ~~ load
dditi01 to this, the magnitu of t
hull (in a
greatest) . p hY the comp.Lete dest~~ucta.an of
~and which ~a arcampana. ~d
neat
'l,~l~e case of a c~estro~>red area of not 'very
that c~;tx~c~~m.:~ty e In
-tam e
. assume l)hat the section of the hull de1.a,ma.
cansegmtence of the action of the shearw
~,c;nU~thj on lay area i5 destrnyF3d only as a
ry , the effect of a cert~.~,ri Y~enc~.in
~.n~f force (that a,s~ d a.sxe~;arda.n~
Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
fl'pinnt aetir~k of this Mme E)CtiQf.)
on. the hasi; o i' the c,ss rnpti cans rnaci above, we obt iri tho
.f'p,1.i()W7?r1a equation or th rna~firflW nagnitudo of 'the orl entrated
iac,, proctuc cynaris strain in the hull at 'the tine o1 an
o~,n7 ~ a a
tLncierwater explosion:
r,
Y
I l.____ 'r'
C
w rnorllent~ oi' inertia at th~r area off' thG hull sect;Lon
where
under CI~)nsid.Orat1on
static -norilL~nt of that portion othr; same section
which i'L? s along one side of thneutral axis, with
respect to that axis
t' the tl i cklt s s ; s o,f: the y~ ii ti cal wafts o{' the
M sum o.
marritude of the reiatc:.s stress producing the
destru,cti.on oI' to vertici. waiis oi' the section
(the s,ppropr:Late yield point of the materials, or
Ei%Ler' S :[:or'raula for StrCSs) o
1e ten natively assume that the section f. or which the
grE:) .. r ma~fn dynamic to ad i to be computed is located
~,t~5L .,~.Lude o)
at a distance of apprcxa. ~matel Of J from the low extrem .ty' of
~'
the hull with J. Cuii length of the ship.
e may make an asswnPtion of this kind since, in the desig-
the bow extremity of the ship, the magiitude of the
nated area o~
force computed by eation (is) varies with suf'f'icient regularity.
c~,u
. r duration of the action of the load T, figuring in
he
equation a great effect on both the magnitude and
equation equation (1)1) has r,
Declassified in Part - Sanitized Copy Approved for Release 2012/04/23: CIA-RDP82-00039R000200170012-9
 Declassified in Part - Sanitized Copy Approved for Release 2012/04/23 : CIA-RDP82-00039R000200170012-9
U aMe tratns1~ tie hula. Curve l in iux$
chAraatr a~. the
athe coei,ea1t off' di~nama,sil~ ai the
13 showy the depeflci,sncy
,~a, t~- magnitude ~ud~ off' the greatest strain,
load K ' w~ilch apc~c:G~es
on the reiatafonship
T
'the duration ai the action oi' thc. load/ T has an even greater
maximum acceloratLoxl produced by the
efteot on the magnitude o1 the
action o.C this load an the hull section.
An exarnina.. ~aon o:E' equation (10) ~:ox acceleration leads to
.
' '~~~ the d,irftinutiori a~' .he time of action of
the aoncl~as.t,on ?~~~at, ~.
the load j , ?~he total acCe1erati0n3 in the hull sections diminish
cna~:irr