, , / , . 1, 2, 3.
.2 .3
, , . .
[1,2]:
1. , : , , , , γxz = 0, γyz = 0, εz= 0.
2. : , , U0= , V0= 0 z = 0.
3. , : , , , σz= 0.
( ), ( ). , : 1. [1,2]:
(1)
x(,), (,), (,)- .
2. ( ) [1,2]:
(2)
z - ; w - , ; ε, ε, γxy- ; χx, χy - ; χ- .
3. ( ) [1,2]:
(3)
( x (,), y(,), (,)) , , (/) [1,2]:
(4)
(4) (3) (x, ), My(,), (,) [1, 2]:
(5)
D = h3 /[12(1-v2)] - .
(5) (1) ( ) [1, 2]:
(6)
(6) . : . .
. x= 0 , , (, , ) [1,2]:
(7)
(7) .
- . = 0 , [1,2]:
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(8)
(w= 0) x= 0 . :
:
(9)
(8) ( ).
. x= 0 , Q*x ( ) [1,2]:
(10)
, ().
(6) , w , - . w . () h1 x h2 (. 4).
. , h1 h2 ik, jk (. 4) , , . , , (), .
.4
w(,) - (). (. 4) , Z. I, j (. 4). - , :
(11)
(11) , - , (h1) , , , h1.
, , .
, [7]:
(12)
(h12) - . , , - , .
- w(x,y) (h12), (h22), (h1h2) [3, 7]:
(11)
w(x,y) x (13).
(13) - xk, yi. , .
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, , . . 5 x= : (. 5 ), , (. 5 ), (. 5 ).
) ) )
. 5.
x= ( ), x=a+h1 - () . x=a+h1 - . . 5 ( ) .
(6), (13). , , , (13) x=a-h1, . 5 - , . 5 - , x=a+h1 ( ), x= ( ) .. = () (. 5 ), x=a+2h1, x=a+h1 ( ).
, wi,j=0, - (6) . , wi,j ≠0 - .
.
-
:
(14)
(. 5 ), :
(15)
- (15) :
(16)
(i; j); (i; j+1); (i; j-1) , w=0, (16) :
(17)
- (17) . - -
(. 5 ). , : (13) :
(18)
, , . , .
, :
, .
( ) :
(19)
, , .
(. 5 ) : 1) , ; 2) . - = (. 5 ):
(20)
(20) w:
(21)
, ( ).
, , . .
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, , , , - - .
.6
. 6 , , .
- (6) , . 6 . (w = 0 - ), , . , .
, . 6 - , .
, (. 6) w =0, w=0.
(. 6 ) :
w=-w2=w1=-w3. (22)
(. 6 6) :
w=w2=w1=w3. (23)
(. 6 ) :
w=-w2=-w1=-w3. (24)
.
, . 7.
- (6) , . 7 . , . 7 , . , ( ).
.7
(. 7 ) :
1)xD=0; 2) D=0; 3) HD=0; 4) Q*xD=0; 5) Q*yD=0. 1 2 :
w-2w+w=0, wF-2w+wB=0. (25)
3
w1-w2+w-w3=0. (26)
4 5 w4 w5, - (6) Ļ QxD, QyD, Q*xD, Q*yD. :
(27)
w4 w5 .
, .7 ( ), : 1) 2) 3) 4) 5)
; (18) :
w=wE, w4=wK, w=w2. (28)
3 :
w=wF=0 (29)
5 :
(30)
w5 .
, w=wE≠0, 4 . .
[3] w=wE=0 4 ( ), wE=0, , [4].
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, . 7 (, - ) :
1) 2) 3) 4) 5)
1 7) :
w=-wE, w4=-wK, w=-w2. (31)
2 :
w=wF=0 (29)
5 , (30), (31) (32) :
w5=0. (33)
, , .