N is b iy d e fo rm a ts iy a la rn i k ic h ik s o n la r e k a n lig in i e ’tib o rg a o lib , o x irg i
t o ‘ rtta had n i tashlab y u b o ra m iz . U h o ld a h a jm n in g n is b iy o 'z g a ris h i q u y i
d agiga teng boMadi:
V - V 0
Ev
= ------------- = £ , + £ , +
£}
B o s h u z a y is h la m i (4 .1 4 ) fo rm u la b o ‘ y ic h a bosh k u c h la n is h la r o rq a li ifo -
dalasak,
l - 2 u
s v =
—
(cr, + cr, + 173)
(4 .1 6 )
E
k e lib c h iq a d i.
1
U s h b u fo rm u la g a k o ‘ ra Puasson k o e ffits ie n ti
— boMsa, (m asalan,
re z in a ) h a jm n in g n is b iy o ‘ z g a ris h i n o lg a te n g boM adi, y a ’ n i jis m n in g h a jm i
o ‘ zg a rish siz q o la d i.
A g a r
<
j
1 = cr2 = cr3 = cr
boMsa, h a jm n in g n is b iy o ‘ z g a rish i q u y id a g ic h a
ifo d a la n a d i:
1 - 2 / /
£v
= —
^
‘ 3C7
E
E
B u ye rd a ^
_
2
^
m iq d o r h a jm iy d e fo rm a ts iy a m o d u li deb a ta la d i va
К h a rfi b ila n b e lg ila n a d i. B u n i (4 .1 6 ) q o 'y s a k ,
cr, + cr, + cr,
e v = —
------- 2-------1
(4 .1 7 )
3k
k e lib c h iq a d i. B u n d a n k o ‘ r in a d ik i, h a jm o ‘ z g a rish i fa q a t bosh k u c h la n is h -
la m in g yig M n d isig a bogM iq ekan.
D e m a k, k u b ik n in g to m o n la rig a ta ’ s ir etadigan bosh k u c h la n is h la rn in g
q iy m a tid a n q a t’ iy nazar, u n in g q irra la ri b ir x il d e fo rm a ts iy a la n a d i.
£■,+£■,+
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