5.29. , , , . ; - ; - (. 18).
N / F ≤ R α KN,
N - ;
F - ;
R α - , II-25-80, . 3.1;
KN - , (σ0; σ90; τ0.90) , . 19 ( 0,25 < c / a < 0,5, KN ).
(. 20, ) , , . :
σ x = Kx (N / F ) ≤ R ;
σ y (σ y ) = Ky (N / F ) ≤ R .90 (R .90);
. 18. ( KN)
. 19. KN α c/a
. 20.
) ; )
. 21. Kx
τ xy = Kxy (N / F ) ≤ R .
N - , ();
F - ();
Kx, Ky, Kxy - , . 20; . 21, 22, 23;
R , R .90, R .90, R - , . 3 II-25-80.
. 22. Ky
. 23. Kxy
. 24.
5.30. Q, . 5.29 N Q, Kx, Ky, Kxy . 21, 22, 23. N Q , R , R .90, R .90, R .
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5.31. , , . II-25-80, . 5.9 5.12.
5.32. II-25-80, . 7; - . 24 .