Equivalent Modulus
Equivalent Modulus
(OP)
Hello All,
Question:
I have a tensile modulus for a face sheet of honeycomb panel which is composed of 6 layers of phenolic (0/90/0/90/0/90). And I would like to calculate tensile modulus for individual layer. Is there any formula which calculates it?
OR
If I know value of modulus for an individual ply is there way to calculate equivalent modulus for a face sheet composed 6 layers of phenolic (0/90/0/90/0/90).
I am new to this area of composites therefore any help will be highly appreciated.
Thanks a lot for your time.
Regards,
Audacious1234
Question:
I have a tensile modulus for a face sheet of honeycomb panel which is composed of 6 layers of phenolic (0/90/0/90/0/90). And I would like to calculate tensile modulus for individual layer. Is there any formula which calculates it?
OR
If I know value of modulus for an individual ply is there way to calculate equivalent modulus for a face sheet composed 6 layers of phenolic (0/90/0/90/0/90).
I am new to this area of composites therefore any help will be highly appreciated.
Thanks a lot for your time.
Regards,
Audacious1234





RE: Equivalent Modulus
Layer properties can be estimated from laminate properties by making some assumptions.
Laminate properties can be calculated from layer (ply) properties using Classical Laminated Ply Theory, which is given in many text books, and probably can be found on the web along with some CLPT codes.
The formulas are not simple enough to write here.
RE: Equivalent Modulus
http://www.thelaminator.net/
You can download and try It.
Onda
RE: Equivalent Modulus
RE: Equivalent Modulus
If it's all unidirectional plies then you need to know a bit more about the material. Are the fibres carbon or glass (or maybe Kevlar, etc.)? What is the fibre volume fraction? (Fibre volume can be found from knowing areal weights of fibre and resin and densities.) Combinations of cloth and UD just get a bit more complicated.
So, as SW says, you need some assumptions, but it's possible to back out ply stiffness properties from laminate ones.
NB: Getting strengths rather than stiffnesses is much harder.
RE: Equivalent Modulus
http://home.comcast.net/~brandihampson/ep.html
click the composite materials link
This is from the professor who taught my composites course in university... IMHO a very good course taught by a great professor.
nick
RE: Equivalent Modulus