1- ;
2-; 3-; 4-
σ-ε -
- - 
-
ν - - = 1 0.15.
15-20% .
Eb = Ebt.
σbt Rbt - ν t = 0,5,
b .
b
3,5; 5; 7,5; 10; 12,5; 15; 20; 25; 30; 35; 40; 45; 50; 55; 60; 70; 80; 90; 100.
B t0,8; B t 1,2; B t 1,6; B t 2,0; B t 2,4; B t 2,8; B t 3,2; B t 3,6; B t 4,0
.
F50; F75; F100; F150; F200; F300; F400; F500; F600; F700; F800; F1000
W2; W4; W6; W8; W10; W12; W14; W16; W18; W20
.15-16
. , .
0 1 ; 1 2
σb= const ( 3-4 )
.
, σ< Rr
σ > Rr , .
.
.. .
,
