ga ega b o ‘ la m iz . F o rm u la n in g o ‘ ng to m o n i ru x s a t e tilg a n k u c h la n is h n i if o
d a la y d i. Shunga k o ‘ ra ru x s a t e tilg a n u rin m a k u c h la n is h n i
q u y id a g ic h a ifo -
dalash m u m k in :
( 5 8 )
M e ta lla r u ch u n ц = 0 ,2 5 -0 ,4 2 e k a n lig in i
h is o b g a o lsa k, ik k in c h i m u s
ta h k a m lik n a za riya sig a k o ‘ ra s o f s iljis h d a g i ru x s a t e tilg a n u rin m a k u c h la n
ish q u y id a g i k o 'rin is h g a ega b o ‘ la d i:
[ r ] = ( 0 , 7 * 0 , 8 ) [ < r ]
(5 .9 )
U c h in c h i m u s ta h k a m lik nazariyasi b o ‘ y ic h a
cr, - cr3 < [c r ] y o k i
t
- ( - r ) < [c r ]
asosida q u y id a g i fo rm u la g a ega boM am iz:
[c r ]
T
<
-—- = \ t
2
И ,
(5 .1 0 )
y a ’ n i s iljis h d a g i ru x s a t e tilg a n
u rin m a k u c h la n is h
[ r ] = 0 , 5 [ o - ] .
(5 .1 1 )
T o ‘ rtin c h i (e n e rg e tik ) m u s ta h k a m lik n a za riya sig a
m u v o fiq
< [ a ]
y o k i V t ^ m ^ " + t ^ < [ c t ] .
[c r ]
B u n d a n :
г >
^ = [ г ] .
(5 .1 2 )
D e m a k,
[ r ] = 0 . 5 7 [ o - ] « 0 . 6 [ < r ] .
(5 .1 3 )
T u r li m u s ta h k a m lik n a z a riy a la ri asosida a n iq la n g a n ru x s a t e tilg a n k u ch
la n is h la r b ir x il e m a s lig in i k o ‘ rd ik . P la stik m a te ria lla r uchun e n e rg e tik nazari
ya b o ‘ y ic h a a n iq la n g a n ru xsa t e tilg a n k u c h la n is h (5 .1 3 ) b oshqalarga nisba
tan y a x s h iro q n a tija b e ris h in i a y tib o ‘ tis h jo iz .
R u xsa t e tilg a n u rin m a k u c h la n is h m a ’ lu m boMsa s iljis h (q ir q ilis h ) dagi
m u s ta h k a m lik sharti q u y id a g ic h a
ifo d a la n a d i;
< [ r ] ,
(5 .1 4 )
max
a
A
B a ’ z i m a te ria lla r u c h u n s iljis h d a g i ru x s a t e tilg a n k u c h la n is h la rn in g q iy
m a tla ri 7 -ja d v a ld a k e ltirilg a n .
