:
1. 2.9
2. 200 000.
3. : t= 1.32, = 1.0, = 0.9, m= 4.5, α = 6.1.
4. 1.15.
5. . 4.8
. 4.8 -
:
(.1.7.8, 1.12.1,1.12.2).
(1.12.2):
k R /σ r,
k ;
R , , ;
σ r , , .
(1.12.3):
R = Ru(1 0,1t) kM k kT,
Ru .
t - ;
kM - ;
kT ;
, (1.12.4):
= α∑ N ,
α , ;
m ;
∑ N , .
:
= 6.1*200000-1/4.5 =0.42
:
R = 2.9 (1-0.1*1.32)1.0*0.42*0.9 = 0.95
σ r () 1.12.6:
σ r = ,
- , ;
- , ( = 0,85) ( = 1,0). = 0.85.
- 1.12.1.
(.4.9):
.4.9 -
I
EI.
2=h1/D= 40/39=1.03,
1=E /1=50/100=0,5
(.1.7.8) EI/ 1 (3), 3=0,77
EI= 1* 3=100*0,77=77
EII
K2= h2/D= 30/39=0.77,
K1=EI/2=77/400=0,19
(.1.7.8) EI1/ 2 (3), 3=0,43
EII= 2* 3=400*0,43=172
3/ E II =2000/172 =11.6
/ =10/39 =0.26
1.12.1 = 1.78
σ r = 1.78*0.85*0.6 = 0.91
1.12.6
|
|
1.15 0.95/0.91 = 1.04
. (E II) , σ r . - .