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holy hyperbolic parabaloids!

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Steve Asselin wrote:
> 
> M/S SATELLITE SYSTEMS wrote:
> >
> > Hello Everybody !
> >
> >   Can anybody throw some light on the following problem faced by us ?
> >
> >      MODELING OF FRP COMPOSITE MATERIALS
> >
> >      COMPOSITES MADE OF WOVEN ROVINGS(FABRIC) HAVE FIBRES IN TWO MUTUALLY
> >      PERPENDICULAR DIRECTIONS.  WHILE MODELLING FOR FEM ANALYSIS EACH LAYER
> >      IS ASSUMED TO HAVE FIBRES ORIENTED IN ONE DIRECTION ONLY.  THERE IS NO
> >      SEPARATION OF FIBRES IN A COMPOSITES MADE OF FABRIC. WHAT SHOULD BE THE
> >      FIBRE ANGLE WHILE MODELLING THE FABRIC ELEMENTS?  WHAT SHOULD BE THE
> >      PROPERTIES OF THE COMPOSITE MATERIAL IN SUCH A LAYER?
> >
> >   If we use 0 or 45 or 90 deg. it represnets only one direction and
> > the results does not match with actual test results.


> >
> > Thank you in anticipation
> >
> > Prasad
> >
> 
> Prasad,
> 
> The only thing I can think of is to use a 3-D orthotropic material with
> the same "E", "G", and "nu" values in both the 1 and 2 planes. Then if
> all the laminates are oriented in the same direction, you can use either
> 0 or 90 degrees for all the laminates(or the actual direction if
> different). Maybe you tried this already. I hope this helps.
> 
> Steve Asselin
> TIW Systems, Inc.
> Structures Engineer
> 
I am searching for an analytical reference for the design of swimming
pools.  Are standard details available commercially?  Advise welcome.