.
1. ( ).
2. ( ). j(e) -
, (12)
(e) - , 0 - , = (,,)- . (e) 0.
, , f(e) , ,
, (13)
N(e) - -, .
. . (, ). . . ( ).
-, .7. , j , W=j Wxx, Wyy, Wxy,
(14)
ei - , i- - , () .
. 7. -
-, , . , j -,
(15)
i, j, k, , . 7. fi, fj, fk . ,
, :
(16)
S ,
(17)
(16) (15) ,
(18)
(19)
(20)
Ni, Nj, Nk, , 1 0 . . , , .
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, , . 8, Xei0eiYei (14).
, , -, , . . , , .
.8
3. (). (13), , ,
(21)
(21) .
i, j, k , . , , .
, .9 .
.9
:
1 i = 1; j = 2; k = 4;
2 i = 2; j = 3; k = 5; (22)
3 i = 2; j = 5; k = 4;
4 i= 4; j = 5; k = 6.
(22) (21),
(23)
(19) Ni, Nj, Nk. (23) .
(24)
4. . f . - . f , . , . :
1. F, , , j j', j'y, j', :
(25)
V - .
F ,
(26)
N - .
2. (13) (26) :
(27)
3. f F.
(28)
(28)
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f = , (29)
, - .
4. (29), . f (21), j .