.
F = 0,5RBY = 0,5∙153= 77 H
= 1,5 , =0,3 .
: 30 σ = 500 , σ = 300 ; :
[σ] = 0,25σ = 0,25∙300 = 75 .
Fp = [K(1 ) + ]F = [1,5(1 0,3) + 0,3]77 =104 H
= πdp2/4 = π(d2 0,94p)2/4 = π(12 0,94∙1,75)2/4 = 84 2
σ = 1,3Fp/A = 1,3∙104/84 = 2 < [σ] = 75
, B. .
45, : s = 780 [3 c. 34]
:
- s-1 0,43×s = 0,43×780 = 335 ;
- t-1 0,58×s-1 = 0,58×335 = 195 .
= (70,92 +14,62)1/2 = 72,4 ͷ
W = πd3/32 = π353/32 = 4,21103 3
Wp = 2W = 24,21103 = 8,42
σv = M/W = 72,4103/4,21103 = 17,2
tv = tm = T1/2Wp = 36,7103/8,42103 = 4,4
[3 c. 165]:
kσ/eσ = 3,4; kt/et = 0,6 kσ/eσ + 0,4 = 0,63,4 + 0,4 = 2,44
sσ = σ-1/(kσσv/eσ) = 335/3,417,2 = 5,7
st = t-1/(kttv/et + yt tm) = 195/(2,444,4 + 0,14,4) = 17,4
s = sσst/(sσ2 + st2)0,5 = 5,717,4/(5,72 + 17,42)0,5 = 5,3 > [s] = 1,5
, C. .
40X, : s = 930 [2c34]
:
- s-1 0,43×s = 0,43×930 = 400 ;
- t-1 0,58×s-1 = 0,58×400 = 232 .
= (268,82 + 97,82)1/2 =286,0 ͷ
W = πd3/32 = π353/32 = 4,21103 3
Wp = 2W = 24,21103 = 8,42
σv = M/W = 286,0103/4.21103 = 67,9
tv = tm = T2/2Wp =110,7103/28.42103 = 6,6
[3 c. 165]:
kσ/eσ = 3,2; kt/et = 0,6 kσ/eσ + 0,4 = 0,63,2 + 0,4 = 2,32
|
|
|
sσ = σ-1/(kσσv/eσ) = 400/3,667,9 = 1,64
st = t-1/(kttv/et + yt tm) = 232/(2,326,6 + 0,16,6) =14,5
s = sσst/(sσ2 + st2)0,5 = 1,6414,5/(1,642 +14,52)0,5 = 1,63> [s] = 1,5
V = LBH = 350∙245∙250 = 21∙106 3
L = 350 ;
= 245 ;
= 250 .
m = φρV∙10-9 = 0,50∙7300∙21∙106∙10-9 = 78
φ = 0,50
ρ = 7300 /3 .
γ = m/T2 = 78/110,7 = 0,70
γ > 0,2 , .
1. .. ..: . ., 1991.432 .
2. . / .. , .. , .. . .: , 1988. 416 .
3. .. . .: . . 1980.
4. .. . .:..,1990.
5. .. . . .:. ., 2002.
6. .
7. .. -. .1-3 .:, 1978.
8. .., .. . .: , 1988.
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