Engineering constant transformation

[dravid]

Hi, i am doing the fem analysis of orthotropic pressure vessel in Ansys. It require to enter the 9 transform engineering constant for unidirectional composite . In most of composite book, they provide the transformtion of FT in XY plane. but what about the transformation normal to XY plane. i mean transforamtion of Et' to Ez, similarly transformation of Vft',Vlt',Gft',Glt', if i rotate the fiber through some angle in XY plane.

Is there any reference, which can provide me the transformation equation of these 9 engineering constant.

 

[kunc]

I think you should be able to find a laminated plate program that will generate those values for you. I would search on the internet and see what comes up.

 

[SJLeemans]

Unless you have a 3D laminate, ie fibers oriented out of the lamina plane, the Z-dir properties (thu the thickness) do not change with an XY (in plane) rotation corresponding to the orientation of the layer. The Z direction properties are typically taken to be the same as the transverse properties of a single composite layer(Et = Ez). I hope this helps.

You can find a list of numerous composites references at

http://www.netcomposites.com.

 

[dravid]

Thanks SJLeemans, but what about the poison's ratios Vft', Vtt'. Does they required transformation, if the fiber is oriented at some angle in XY plane.