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Composite Ananlysis..Engineering Constants

Composite Ananlysis..Engineering Constants

Composite Ananlysis..Engineering Constants

(OP)
Hi all,
I confused the data given in patran environment while assigning laminae making use of Pcomp cards.When i hit the show properties (like E's nu's G's and stiffness matrix) in the first column those properties ,for a lamina on xy plane, shown  such that E11,22,33  My question is that what do these designations stand for? which direction is implied?  
what i get from the patran for the folowing lamina as follows:


lamina properties:   (this designation is for fiber direction and its transverse direction properties.)
                         
                    E11:20e6
                    E22:2e6
                    G12:1e6
                    v12:0.35

In Pcom card this lamina is oriented 30 degree from the body coord axis (+30 from Coord0.1  -------->x  )

and its appearent (i mean its properties at body coord
-------x)properties  are given in patran environment as follows

stiffness matrix [Q]
1.25E+07    3.87E+06    5.77E+06
3.87E+06    3.42E+06    2.12E+06
5.77E+06    2.12E+06    4.16E+06

(it is ok i can find this matrix by hand calculation)

and those properties which i cannot get any sense (also cannot find by hand calculations) are given in the format as in patran GUI as follows:

??????
E11,22,33    nu12,23,13     G12,23,13

8.15e6        1.13            4.16e6
2.23e6         0                0
 0             0                0

????



for which direction does patran give these properties here
Quest_1 : In its 1-2 material directions?
Quest_2 : In the body coord axes xy direction respectively?

From theory (maybe i use wrong equations ) i find
   
Appearent engineering constants for a lamina oriented +30 degree from the body coord axis x:  


Ex    4.16E+06   (not eqaul to 8.15e6 ) ?
v_xy    3.97E-01   (not eqaul to 1.13 )   ?
Ey    2.15E+06   (not eqaul to 2.23e6 ) ?
G_xy    1.45E+06   (not eqaul to 4.16e6)  ?





where am i wrong?
thanks in advance

RE: Composite Ananlysis..Engineering Constants

Somewhat of a confusing post...

The 11, 22, 33 relate to the x,y and z directions.
And as follows: the 12 etc are the shears. It i sall made clear in the manuals

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