N ! 2 0 - I O 3
<7. = — = -------— = 10-107Я / д < 2
= \ 0 0 M H / m 2 ' A 2 - 1 0
B rus y u q o ri q is m in in g o x irid a g i n o rm a l ku ch la nish
N " 3 0 - I O3
—
= --------
z r = 1
5 0 M H / m 2 " A 2 - 1 0
N o rm a l k u c h la n is h epyurasi 2 .2 - f rasm da k e ltirilg a n .
B ru sn in g a b so lut c h o ‘ z ilis h in i h is o b la y m iz
v '
i - L M _ ■' '
2
|
W ' d x __
F t |
\ ( F + qx)dx _ F t |
gl? _ 20-10' -2
10-IO3 - ! 3
K4 + J
K4 2 EA J E4 E4 + SE.4 2 - 1 0 l , - 2 - 1 0 - , +
8 - 2 - 1 0 M - 2 - 1 0 ~ ‘
= 1 . 1 2 5 - 1 0 - 3
m
« 0 . 1 1 3
c m
•
2.2. Sen-Venan prinsipi haqida Y u qorida B e m u llin in g
tekis kesimlar gipotezasi bilan tanishib chiqqan edik.
B u gipotezaga binoan c h o ‘ ziluvchan sterjenlam ing k o ‘ndalang kesim lari d e fo r
matsiya jarayonida geom etrik y a ssilig in i saqlab q o lish i u q tirilg a n edi.
B iro q m a te ria lla r q a rs h ilig i va e la s tik lik nazariyasida Sen-Venan p rin s ip i
deb atalgan yana b ir qoida ham b o rk i, bu qoid a B e m u lli gipotezasiga m a ’ lu m
darajada o y d in lik k irita d i. P arij a ka d e m iya sin in g a ’ zosi Barre de Sen-Venan
(1 7 9 7 -1 8 8 6 ) p rin sip ig a k o ‘ ra: agar jis m g a bosh v e k to ri va bosh m o m e n ti b ir
x il boMgan statik e k v iv a le n t k u c h la r sistemasi ta ’ s ir etayotgan boMsa va, ayni
b ir paytda, k u ch la r q o ‘y ilg a n jo y jis m n in g oM cham lariga nisbatan uncha ka t
ta boMmasa, u holda k u ch q o ‘ y ilg a n jo y d a n b iro z naridagi kesim larda ho sil
boMadigan k u ch la nish la r y u k n in g q o ‘ y ilis h usuliga uncha bogMiq boMm aydi.
S en-V enanning bu p rin s ip in i ta s d iq layd ig a n nazariy isb o tla r m avjud emas,
am m o o lib borilgan k o ‘ p so n li ta jrib a la r b u n ing to ‘g ‘ rilig ig a shubha q o ld irm a y -
di. P rin sip n in g m o h iy a tin i m iso l o rq a li tushuntiram iz.
2.3-rasm da y u q o ri uchi m ahkam langan p riz m a tik sterjenning erkin uchiga
s ta tik e k v iv a le n t k u c h la m in g u ch x il jo y la s h t ir ilis h i ta s v irla n g a n b o M ib ,
ham m a sin in g teng ta ’ s ir e tu v c h is i F v e k to rig a teng. K u c h la m in g q o ‘ y ilis h
u s u li tu rlic h a : 2.3-a rasm da s te rje n n in g s im m e triy a o ‘ qi b o ‘ y la b yigM q k u ch
k o ‘ rin is h id a , 2.3-b rasm da ik k ita ku ch s ifa tid a , 2 .3-d rasm da y o y iq k u ch
k o ‘ rin is h id a q o 'y ilg a n . T a d q iq o tla m in g k o ‘ rsatishicha, barcha h o lla rd a ku ch
