(. 12.1) , . , , , . , , .
. 12.1.
- , . : , .
, . 20 5657 HRC 40 . . . 315.
. (. 13.1) :
1. = 100 ×.
2. d = 28 .
3. () β = 1,45.
. 13.1.
1. , ( ):
2. , :
Dc = 2d = 2 28 = 56 .
3.
4. ( )
5. , :
; .
6. , , :
.
7. , , :
.
8. Q 2 ≥ Q 3,
9. ρ = 2; f = 0,05; D = 56 ; d = 28 ; β = 1,45
0,0803tg2α + 0,4505tgα 0,3305 = 0
α = 4057'30''.
10. α = 42,
Q1 = Ft tg = 3571,30,9 = 3214,17 H;
Q2 = 5178,57 [tg(42º 2º) 0,05 ] = 3827,48 H;
Q3 = 3571,3 [tg(42º + 2º) + 0,05 ] = 3805,9 H.
|
|
,
,
.
11. . ( )
b ≈ (0,130,16) D c = (0,130,16) 56 = 7,39 .
b = 10 .
.
h ≈ (0,50,6) b = (0,50,6) 10; h = = 6 .
D = (1,51,8) d = (1,51,8) 28 = 4250 .
D = 42 .
L (0,81,8) d = (0,81,8) 28 = 2250 .
L = 35.
Z, r σ.
12.
13. r Z
.
ρ () .
,
r 1 = r 2 = 2ρ,
r 1, r 2 ;
Z , ;
. = 2,1105 . ,
60 HRC
r 1 = r 2 = 2 ,
Z = 10.
k , D = 56 ,
(.13.2).
14. T p:
|
[σ] ≈ 30 .
15. , Z > 11. 1/3; 1/2 .
Z = 11.
W = = = 299,27 3.
σ =
20
1. (. . 13.1)
;
D 0 .
, D = 4250 . , D = D 0 d D : D ≥ d. ,
.
d ≥ 6 σ [12, . 488].
= 8.
, .
= 8,
[τ] :
σ = 1450 1- 2- d ≥ 6 [11, . 99; 12, . 488].
|
|
.
= 8 D 0 = 12,55 8 = 100 , D , D = 100 12,55 ≈ 87 . = 6,
= 6 D 0 = 11,19 × 6 = 67,14 .
d = 11 , D 0 = 11 6 = 66 , D = 66 11 = 55 , D = 42 .
2. - F p h:
F p = h.
,
F 2 () Q 2;
F 1 () Q 1.
n ;
G ; G = 8 104 .
F p = h,
,
.
h, Q 2, Q 1, ,
n = 5.
3. , :
F 1= .
, :
F 2= .
4.
n 1 = n + (1,52) = 5 +2 = 7 .
( )
.
H 0