.
III, × 135,76.
IV, × 462,88.
nIII, / 288.
nIV, / 83,6.
= 3,55.
Lh, 15000.
I.
.
:
- , 5500;
- , 4233,8;
- / = 2,2.
2.2.1
, /2, .7, 1/ :
- : 40 4543-71: , 3 269÷302, σ3 = 900 , σ3 = 750 ;
- : 40 4543-71: , 4 235÷262, σ4 = 700 , σ4 = 640 .
2.2.2
3 = (min3 + HBmax3) / 2 = (269 + 302) / 2 = 285,5 ;
4 = (min4 + HBmax4) / 2 = (235 + 262) / 2 = 248,5 .
2.2.3 N∑1 N∑2
N∑3 = 60 × Lh × nIII = 60×15000×289 = 2,6×108;
N∑4 = 60 × Lh × nIV = 60×15000×83,6 = 0,752×108.
2.2.4
:
- : NHE3=kHE× N∑3= 0,3×2,6×108 = 0,78× 108,
kHE = 0,3 I /2, .12, 5/;
- : NHE4=kHE× N∑4= 0,3×0,752×108 = 0,2256× 108.
:
NFE3=kFE× N∑3= 0,3×2,6×108= 0,78×108,
kFE = 0,3 II /2,.12, 5/;
NFE4=kFE× N∑4= 0,3×0,73×108= 0,219×108.
2.2.5 , NHG1 NHG2
NHG3 = 30 × (HB3)2,4 = 30 × 285,52,4 = 23,47 × 106;
NHG4 = 30 × (HB4)2,4 = 30 × 248,52,4 = 16,82 × 106 /2, .8/.
2.2.6 ,
:
NFG3 = NFG4 = 4 × 106 /2, .8/.
2.2.7
|
|
2.2.7.1
:
,
σlim :
σlim3=2 HB3 +70 =2285,5+70=641 /2, .9, 3/;
SH ; SH = 1,1 /2, .9/.
- ,
> NHG3 =23,47 × 106, /2, .10/.
- , , =0,9 /2, .10/;
- , , = 1 /2, .10/;
.
:
,
σlim4=2HB4 +70 =2248,5+70=567 .
NHE4 =0,365 × 108> NHG4=16,82 × 106,
/2, .10/;
.
:
,
.
2.2.7.2
:
,
- /2, .12, 4/, :
=1,75 × HB1= 1,75 × 285,5 =499,6 ,
- /2, .11/;
,
NFE3 6,91 × 108 > NFG3 = 4 × 106, /2, .11/;
, , /2, .12/;
, (); /2, .12/.
: .
:
,
=1,75 × HB4= 1,75 × 248,5 =434,9 .
NFE4 =0,219 × 10 8 > NFG4=4 × 10 6 , /2, .11/, :
.
2.2.8 [σ]Hmax [σ]Fmax
1) [σ] Hmax
[σ] Hmax = 2,8×σ4 = 2,8 × 630= 1764 .
2) [σ]Fmax3 [σ]Fmax4
[σ]Fmax3= 2,74 × 3 = 2,74 × 285,5 = 782,3 ;
[σ]Fmax4 = 2,74 × 4 = 2,74 × 248,5 = 680,9 .