5.24*. - - (49) mef £ 20, , .
5.25*. -, -, - - 530 (5400 /2), , t £ 0,5 Rs N /(AnRy) > 0,1
(49)
N, Mx My ;
n, cx cy , . 5.
N /(AnRy) £ 0,1, (49) . 7.5 7.24.
(50)
.
5.26. - - ( ), (- ).
5.27*. - - ( . 5.28* 5.33 ) , ,
(51)
(51) je :
) . 74 mef,
mef = hm, (52)
h , . 73;
( ;
Wc );
) , , , . 75 ef (lef . 7) m,
(53)
, , , .
e = M / N M N . 5.29.
- - . 15*.
- mef > 20 m > 20, .
|
|
5.28*. - , 530 (5400 /2) ( 10 11 . 73), (51),
(54)
Wnt , d
d = 1 Nl 2/(p 2 EA). (55)
5.29. N .
:
;
;
, , , ;
, , , ;
- , , , , . 9.
9
, | M | |
Mmax | < 4 | ³ 4 |
m £ 3 | M = M 1 | |
3 < m £ 20 | ||
, 9: Mmax ; M 1 , 0,5 Mmax; m , m = MmaxA /(NWc). . M ³ 0,5 Mmax. |
- , , mef . 76.
5.30. - (Jx > Jy), ,
(56)
, . 5.31;
jy , . 5.3 .
5.31. (56) :
mx £ 5
(57)
a b , . 10;
10
a | b | ||||
mx £ 1 | 1 < mx £ 5 | ly £ lc | ly > lc | ||
0,7 | 0,65 + 0,05 mx | ||||
J 2/ J 1 < 0,5 b = 1 | |||||
: | |||||
( ) | |||||
0,6 | 0,55 + 0,05 mx |
, 10:
J 1 J 2 y y;
|
|
jc jy
. a b ( ) . , .
mx ³ 10
(58)
jb , . 5.15 . 7* ; jb = 1,0;
5 < mx < 10
c = c 5(2 0,2 mx) + 10(0,2 mx 1), (59)
5 (57) mx = 5, a c 10 (58) mx = 10.
mx Mx :
- , , ( );
, ( , ).
:
;
,
(60)
d = 4 r / m; r = (Jx + Jy)/(Ah 2); ; Jt = 0,433S biti 3;
bi ti , ;
h ;
, (173) . 6.
5.32. - , (Jy < Jx ey ¹ 0), lx > ly (51), -
, (61)
jx , . 5.3 .
lx £ ly .
5.33. - , , , (51) - (7).
. , y y (. 7), : Nad = M / b 1 3; Nad = M /2 d 2; 3 , , Nad = 1,16 M / b ( b ).
- - ( ), . 5.36 .
5.34. , , (Jx > Jy)
, (62)
jey . 5.27* m l my ly, c . 5.41.
mef,y = hmy h 8 . 73.
mef,y < mx (62) (51) (56), ey = 0.
|
|
:
, (63)
Wcx Wcy .
lx > ly, (62) (51), ey = 0
(Jx > Jy) mx 25%.
5.35. , (. 6), , , :
, , . 5.27*, ey = 0;
- (51) (56), Mx (. . 5.33), My ( , ). (51) . 6.13 , (56) .
5.36. - . 5.9 5.10 , : Q Qfic, . 5.8* .
, , - , , .
5.37. , , .
, , .
0,3, 0,03.
5.38. () ( , p /2)
, (64)
F () ;
r l ;
Rlp , . 3.1* .
5.39.
(65)
n ;
d l ;
Rcd , . 3.1.* .