Structural analysis ,material properties


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Gaurav Kumar Thakur
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Hi
I have done component using CFRP prepreg now i wanted to FEA analysis for the same ,Vendor has provided the technical data sheet for the same but in that only three properties are given ,tensile modulus,Tensile strength ,and %elongation, can any body give suggestion what should be done??? 
Rosta Spicl
Rosta Spicl
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Not easy...
Fibre based composites are strictly transversely isothropic. For structural static analysis the must have parameter is Young modulus for 0° (E1) and 90° (E2). For wooven fabrics boths are the same, not for UDs...there is the E2 cca 10-15x lower than E1. Remember, the E is largely different for dry fibres and cured laminate.
The FEM model has to be strictly the same like a real sample, the plies schedule, fibers direction, thickness etc. I´d recommend the fem model build like a shell.
The best is validate the FEM model with reality, measure the displacement and stresses on real condicions and fit it on FEM model.
Good luck, FEM on complex composites structures is the big chalange...

oekmont
oekmont
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For detailed FEM analysis for non trivial frp structures you will need a special frp FEM program. This is because of the non isothropic material characteristics and the fact that fibre directions will change when the planar cloth is applied to a non trivial mould. If you really want to go to the limits there is still no way around testing in reality. For simple forms and layups you can get good results with classical structual analysis or fem if you know what you are doing. If not, fem can mislead you because of it's blackbox characteristics.

Rosta Spicl
Rosta Spicl
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All today's FEM solvers can analyze multi layered shell structures. Generally no need special utilities. That's valid for structural analysis based on Hook's law, where the stress is related to Young's modulus. The FRP utilities, you have talking about, offers the special rutines for mesh and shell design which is much more user friendly. But, there is an issue, the FEM mesh generators doesn't solve the manufacturing requirements. It means the FEM net doesn't respect the fabric's wrap angle limit, darts etc. and takes a lot of work to do this right.


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