.
- .
:
- n= /.
- = /.
- = .
- = .
- L = .
- Lc= .
- =0,.
- tc= 8 .
- -
- 40, HRC48-54.
- : 120%
1
1-, 2- ,
3- (), 4-, 5-
1.
.
:
I- ();
II- ( );
III- .
.
- ... .
= 0,95..0,97- ... ;
= 0,99 - ... ;
= 0,98 - ... ;
= 0,8..0,85 - ... . [1.. 1.1]
[1. .1] 4, , , n= /,
= %.
[1. .2] d= .
.
[1. . 54] u=,
.
= ;
. 1
_________ 1.
P, | n, / | , | |
I | |||
II | |||
III |
.
.
HRC .
.
2< vs <5 / , , =236 , [1..4.8]
.
|
|
- .
[1..4.9] vs - / HRC > 45 [σ] = , (), .
;
- ;
= [1..4.8]
Kfl
-
Lh -
.
1 > K FL> 0,543 -