First, curiosity forces me to ask why you would want an Al/CF/Al sandwich.

Second, its not clear to me what you are asking.
If you are asking if it is appropriate to validate your design by doing an analysis of a single piece of aluminum that is as thick as your sandwich the answer would be no, this would obviously neglect the effect of the carbon fiber "core."

If you're asking if it is appropriate to calculate the properties of the sandwich panel as a whole, and use the result as the equivalent moduli for a single orthotropic plate, the answer can be yes, but proceed with caution as many assumptions are made with the simple formulas for equivalent moduli.

A more thorough description of your panel, goals, and application is likely to help get a response from others in the forum.

before you fabricate this, check the electrical properties.
B.E.

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

Actually, that wasn't my idea to design a AL/C-Epoxy/AL !! Having a composite course and its assignment, force me to that!!

I derived the equation of motion of this beam ( Vibration analysis !!) and now I want to validate or my results with a one-layer AL beam!! How does it possible?!

Is this a student posting?
B.E.

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