Prepreg bending stiffness

[Chris10B]

I am trying to find the bending stiffness of prepreg material for simualting a molding process. There are some tests available such as the buckling test, where a strip of prepreg is axialy compressed and the deflection is measured. But then how would you go from that data to calculating the bending stiffness?

Thanks!

Chris

 

[berkshire]

This is like asking " How long is a piece of string?" You need more details What weave? is the prepreg B staged if so how much? are you bending across the fibers , or with them?
B.E.


You are judged not by what you know, but by what you can do.

 

[SWComposites]

Perhaps just run a cantilever type bending test on a sample of the prepreg? Measure displ vs load and back out E.

 

[SandEngXp]

i agree with Berkshire. I have tried this with foam core materials as well. normally very small tension strain but large compression strain.

one thing if trying to fit a metal modelling program is count on NO stretch, only compression via fiber distortion. fiber distortion will be a function of fabric type and resin type/staging.

Good Luck

Chris