Lh = (106/601178)(85000/6304)10/3 = 82549
25200
2007111, = 51
Lh = (106/601178)(51000/6304)10/3 =15038
25200 .
7211.
: , , .
, .
.
1- 2 .
.
, , : =10 , 2=15 .
, - . , , .
8.
23360-78.
45 .
= 100
τ = 2/dlb < [τcp] = 0,6[σc] = 60
h ; t1 ; l
b .
.
14×9×50
σ = 2138,7103/45(9-5,5)(50-14) = 49,0
τ = 2138,7103/455014= 8,9
14×9×36
σ = 2138,7103/45(9-5,5)(36-14) = 80,1
τ = 2138,7103/453614=12,2
.
18×11×70
σ = 2334,8103/60(11-7,0)(70-18) = 53,6
τ = 2334,8103/607018= 8,9
14×9×80
σ = 2334,8103/45(9-5,5)(80-14) = 64,4
τ = 2334,8103/458014=13,3
σ < [σ] .
9.
.
. .
45 : σ = 780
:
- σ-1 = 0,43σ = 0,43780 = 335
- t-1 = 0,58σ-1 = 0,58335 = 195
= (51,62+208,12)0,5 =214,4 ∙.
:
kσ/εσ = 4,4 [1c.166]
|
|
kτ/ετ = 0,6 kσ/εσ + 0,4 = 0,6∙4,4+0,4 = 3,0; yt = 0,1.
:
W = πd3/32 = π553/32 =16,3∙103 3
Wp = 2W = 2∙16,3∙103 =32,6∙103 3.
:
σv = M/W =214,4∙103/16,3∙103 =13,2 ; σm = 0.
:
τv = τm = τmax/2 = T1/2Wp =138,7∙103/232,6∙103 = 2,1
:
sσ = σ-1/(kσ/εσ)σv = 335/4,4∙13,2 = 5,8
sτ = τ-1/[(kτ/ετ)τv + ψττm] = 195/(3,0∙2,1+0,1∙2,1) = 30,0
s = sσst/(sσ2 + st2)0,5 = 5,830,0/(5,82 +30,02)0,5 = 5,7 > [s] = 2,5
45: σ = 440 ; [1c.34]
[σ] = σ/n = 440/2 = 220
n = 1,2÷2,5 .
= = (214,42+0,75∙138,72)1/2 =245,8 ∙
σ = /W =245,8∙1,7∙103/(16,3∙103) = 25,6 < [σ] = 220
.
.
:
W = πd3/16 bt1(d-t1)2/2d =
= π453/16 145,5(45-5,5)2/245 = 16,6103 3.
tv = tm = T1/2W =138,7103/216,6103 = 4,2
:
kt = 1,5; et =0,72; yt = 0,1 [1c166]
,
s = st = t-1/(kttv/et + yt tm) = 195/(1,54,2/0,72 + 0,14,2) =21,3
,
45 : σ = 570
:
- σ-1 = 0,43σ = 0,43570 = 245
- t-1 = 0,58σ-1 = 0,58245 = 142
= (180,02+ 72,72)1/2 =194,1 ͷ
W = πd3/32 bt1(d-t1)2/2d =
= π603/32 187.0(60-7,0)2/260 = 18,3103 3
W = πd3/16 bt1(d-t1)2/2d =
= π603/16 187.0(60-7,0)2/260 = 39,5103 3
σv = M/W =194,1103/18,3103 =10,6
tv = tm = T2/2W = 334,8103/239,5103 = 4,2
:
kσ= 1,6; eσ =0,79; kt = 1,5; et =0,67; yt = 0,1 [2c166]
sσ = σ-1/(kσσv/eσ) = 245/(1,610,6/0,79) =11,4
st = t-1/(kttv/et + yt tm) = 142/(1,54,2/0,67 + 0,14,2) =14,5
s = sσst/(sσ2 + st2)0,5 =14,511,4/(11,42 +14,52)0,5 = 9,0 > [s] = 2,5
|
|
D. .
= 283,6 ∙.
:
kσ/εσ = 3,6 [1c.166]
kτ/ετ = 0,6 kσ/εσ + 0,4 = 0,6∙3,6+0,4 = 2,2; yt = 0,1.
:
W = πd3/32 = π553/32 =16,3∙103 3
Wp = 2W = 2∙16,3∙103 =32,6∙103 3.
:
σv = M/W =283,6∙103/16,3∙103 =17,4 ; σm = 0.
:
τv = τm = τmax/2 = T2/2Wp =334,8∙103/232,6∙103 = 5,1
:
sσ = σ-1/(kσ/εσ)σv = 245/3,6∙17,4 = 3,9
sτ = τ-1/[(kτ/ετ)τv + ψττm] = 142/(2,2∙5,1+0,1∙5,1) = 12,1
s = sσst/(sσ2 + st2)0,5 = 3,912,1/(3,92 +12,12)0,5 = 3,7 > [s] = 2,5
45: σ = 290 ; [1c.34]
[σ] = σ/n = 290/2 = 145
n = 1,2÷2,5 .
= = (283,62+0,75∙334,82)1/2 =405,6 ∙
σ = /W =405,6∙1,7∙103/(16,3∙103) = 42,3 < [σ] = 145
.
.
:
W = πd3/16 bt1(d-t1)2/2d =
= π453/16 145,5(45-5,5)2/245 = 16,6103 3.
tv = tm = T2/2W =334,8103/216,6103 =10,1
:
kt = 1,5; et =0,72; yt = 0,1 [1c166]
,
s = st = t-1/(kttv/et + yt tm) = 142/(1,510,1/0,72 + 0,110,1) = 6,4
10.
[1c.263]
7/6;
7/n6;
L0/k6;
7/l0.
11.