23360-78.
40 .
:
= 120
τ = 2/dlb < [τcp] = 0,6[σc] = 72
h ;
t1 ;
l ;
b .
. 8×7×40
σ = 215,92103/24(7-4)(40-8) = 18,8
τ = 215,92103/24408 =4,1
. 12×8×30
σ = 261,05103/40(8-5)(30-12) = 56,5
τ = 261,05103/403012 = 8,5
. 16×10×37
σ = 2162,48103/50(9-5,5)(30-14) = 116
τ = 2162,48103/503014 = 15,5
. 12×8×70
σ = 2162,48103/40(8-5)(70-12) = 46,7
τ = 2162,48103/407012 = 9,7 .
10.
10.1. .
-, . , .
40, : s = 930 [4c.34]
:
- s-1 0,43×s = 0,43×930 = 400 ;
- t-1 0,58×s-1 = 0,58×400 = 232 .
d= 24, b= 8, t1= 4
W = πd3/16 - bt1(d- t1)2/d = π243/16 - 84(24-4)2/224= 2,44103 3
W = πd3/32 - bt1(d- t1)2/d = π243/32 - 84(24-4)2/224= 1,08103 3
kt= 1,9 [4.8.5], st= 0,83 [4.8.8] yt = 0,1 [4.166]
16162-78 , , . 2,5()1/2
25103 < <250103
= 2,5(15,92103)1/2(80/2)= 12,6103
:
tv = tm = T1/2W = 15,92103/22,44103 = 3,2 .
:
σv = M/W = 12,6103/1,08103 = 11,7 .
.
sσ = σ-1/(kσσv/eσ) = 400/(1,911,7/0,83) = 15,5
.
st = t-1/(kttv/et + yt tm) = 232/(1,93,2/0,83 + 0,13,2) = 31,5
-
s = sσst/(sσ2 + st2)1/2 = 15,531,5/(15,52 +31,52)1/2 = 13,9 > [s] = 2 [2c162]
10.2. .
40, : s = 930 [4c.34]
-. .
:
= (54,522 + (-2,92)2)1/2 = 55
:
,
t1 b
W = p×403/32 [12×5×352]/240= 6,61×103 3
|
|
:
W_ = p×403/16 [12×5×352]/240= 12,3×103 3
:
tV = tm = 2/2×W = 62,05×103/2×12,3×103 = 2,5
:
sV = /W = 55×103/6,1×103 = 9
:
ks = 1,9 [1c. 165]; es = 0,70 [1. 166];
kt = 1,9; et = 0,70;
yt = 0,1 [1. 166].
:
= 400/(1,9×9/0,70) = 16
:
= 232/(1,9×2,5/0,70 + 0,1×2,5) = 33
:
= 16×33/(162 +332)1/2 = 14,4 > [s] = 2,0
10.3. .
- . .
40, : s = 930 .
:
- s-1 0,43×s = 0,43×930 = 400 ;
- t-1 0,58×s-1 = 0,58×400 = 232 .
:
= (71,12 + 11,92)1/2 = 72 ×
:
= p×503/32 [14×5,5×(50-5,5)2]/(2×50)=10,7×103 3
:
= 23×103 3
:
sV = / W = 72×103/10,7×103 =6,7
:
tV = tm = 3/ (2×W ) = 162,48×103/2×23×103 = 3,5
:
ks = 1,9 [1c. 165]; es = 0,70 [1. 166];
kt = 1,9; et = 0,70;
yt = 0,1 [1. 166].
:
= 400/(1,9×6,7/0,70) = 22
:
= 232/(1,9×3,5/0,70 + 0,1×3,5) = 23,6
:
= 22∙23,6/(222 + 23,62)1/2 = 15,9 > [s] = 2,0 [1c. 162]
- F
:
= 40,3 ∙.
:
kσ= 1,9 εσ = 0,73 [4c.166]
kτ= 1,9 ετ = 0,73; yt = 0,1.
:
= p×403/32 [12×5×(40-5)2]/(2×40)=5,4×103 3
:
= 11,7×103 3
:
σv = M/W =40,3∙103/5,4∙103 = 7,5 ; σm = 0
:
τv = τm = τmax/2 = T3/2Wp = 162,48∙103/2∙11,7∙103 = 6,9
:
sσ = σ-1/(kσ/εσ)σv = 400/1,9∙7,5/0,73 = 20,4
:
sτ = τ-1/[(kτ/ετ)τv + ψττm] = 232/(1,9∙6,9/0,73+0,1∙6,9) = 12,4
:
s = sσst/(sσ2 + st2)0,5 = 20,412,4/(20,42 +12,42)1/2 = 10,5 > [s] = 2,0
11. .
- 21424-75 [T] = 125 ͷ.
|
|
:
= k1 = 1,515,92= 23,88 ͷ < [T]=125ͷ
< [T] .
.
[1c.263]
7/6;
7/n6;
k6;
7.
.
13.1. .
:
V = (0,5¸0,8) = (0,5¸ 0,8)4,83 4
:
- v = 4,776 / n =2810-6 2/
- v = 1,99 / n = 3410-6 2/
n = 3110-6 2/
-30
13.2. - -1.
.
. , .
, , 80 100 º .
; , .
; , , .
, , : ; .
, , .
, , .
, .
1. : . . .. .. . .: . ., 1978. 247 .
2. .
3. .. . .: . ., 1991.432 .
4. . /.. , .. , .. . .: , 1988. 416 .
1. ...3
2. 腅...............................5
3. 腅....10
4. ⅅ..15
5. ....16
6. ..17
7. ..18
8. ⅅ.19
9. 酅...25
10. ⅅ.....26
11. .....30
12. ꅅ.........................................................31
13. ...................................................32
14. ...33
|
|
....34