F
8 0 0
_
„
H
=■
= 7 6 9 2 ,3 -
S d
0 .8 -1 .3
sm '
T o p ilg a n ku c h la n is h ruxsat e tilg a n k u c h la n is h d a n kam c h iq d i, dem ak
e z ilm a s lik sharti q a n o a tla n tirila d i.
5.2-misol. Burchaklikni list-
g a tutashtirish, uchun zaru r
bo ‘Igan parchin mixlar soni an
iqlansin (5,14-rasm). Qo'yilgan
yuk F=75kH. Parchin mix d i
ametri d = 1,7sm; [o]=140,0MPa;
[ t ] =
110,0 MPa,
[a , .]
=280,0
MPa. L ist va burchaklikning
uzilmasligi ham tekshirilsin. Boshqa о 'Ichamlar shaklda berilgan.
Y e c h is h . P archin m ix la m in g k e s ilm a s lik s h a rtid a n :
F
5 .14-rasm.
n >
E z ilm a s lik shartidan;
n > ,
H
F
n d 2
n
= 3 .
n - 2 .
KT
U c h ta p a rc h in m ix q o ‘ y a m iz .
B u rc h a k lik b ila n lis tn in g u z ilm a s lik s h a rtin i te k s h ira m iz ;
B u rc h a k lik n in g k o ‘ ndalang kesim yu za si
As = 9 , 8 7 s m 2.
L is tn in g k o ‘ ndalang kesim yuzasi
A
= 8 ,0 T , 2 =
9 ,6 s m 2
c r, = —
= 8 8 ,0
M Pa <
[c r ] >
As
S d
A1
-
S d
D e m a k , m u s ta h k a m lik ta ’ m in la n g a n .
© ' О О
5 .15-rasm.
5.3-misoL Kengligi b = 27 sm,
qalinligi
5 =
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