Hi, i want to increase the thickness of some aluminium sheet by adding several layers of carbon fibre to the one side of it. However I want the finished piece to have structural strength not just cosmetic.
My plan was to produce the carbon panels first with several layers of reinforcement using a vacuum bag and peel ply on one face, then fix to the aluminium panels via a structural glue rather then epoxy resin.

Thoughts would be welcome ,thanks 

What is the application for this? Why can't you use the composite panel complete instead of bonding it to the ali panel?

Aluminium is ductile, carbon is brittle. You can't reinforce one with the other, because the ductile material carries all the load. Either the brittle material needs to be strong enough to resist failure on its own, which means the ductile material is doing nothing; or if the ductile material is the stronger part of the laminate then the brittle material will fail first and be doing nothing. 

If the aim is to increase thickness for whatever reason then that's fine, adding carbon is a lightweight way to do that. But structurally speaking, it won't be stronger.

Keeping the carbon balanced would produce a part that is stronger, that strength being dominated by the carbon.  Stiffness would be increased. 

One problem would be dealing with galvanic corrosion.  When bonding to aluminum, it is critical to properly prep the aluminum and use a proper adhesive for it.  

It can be done although not recommended in the case of a structural part.

This below is an intake for a subaru we have done which was one layer pre preg carbon wrapped over a folded sheet alloy part. It was just a simple way to form the shapes without building moulds. and to test fit the part too. The tube is also aluminum.