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Engineering constant transformation

Engineering constant transformation

Engineering constant transformation

(OP)


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.  

RE: Engineering constant transformation

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.

RE: Engineering constant transformation

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.

RE: Engineering constant transformation

(OP)
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.

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