. (. 15.3):
1. .
2. , -
Fn, .
Fn (90 - α') ; α' αw. Fn N1N2 . (. 15.4, ) , .
, ,
σ = Fnsinα'/(bS), . 15.4, . b - .
. = Fnhp cosα',
σ: . 15.4, , - .
. 15.3 |
σ Fhom (. ) , (. ). -
. , 1, , b t.A (. 15.4). , , .
σFhom - b t.A:
. 15.4 Wx = bS2/6 - .
Fn Ft KF:
, . α :
σ f = σF α , α - .
hp S :
hp = μ S = λ,
μ λ - , .
YFs - ,
:
YFs, , . YFs , .
σF ≤ [σ]F, :
(15.4)
[σ]F - , ; Ft - ; b m - .
: Yβ - , , Yε - , .
|
|
: Yβ = 1; Yε = 1 8,9; Yε = 0,8 5 - 7.
- , ; YFs(YFs1 > YFs2).
.
[σ] F1 /Y Fs1 ≈ [σ] F2 / Y Fs2 .
T1 - ; b2, aw- ; σF [σ]F - . m: |
(15.4) Ft = 2.103 T1/d1 ,
b1 2 - 4 b2 - . , .
b = b2 = 103 YFsYβYε,
m≥KmKFT1(ul)/(b2aw[σ]F),
= 3,4.103 = 2,8.103 - ; T1 ; b2, aw ; [σ]F b .
[σ]F [σ] F1 [σ]F2.