Hello,
I will be building a carbon fiber part and have based my lay-up on classical laminate theory calculations. However, there is one thing I cannot find enough information on that could be critical in determining the strength of the part; The laminate is bonded to an aluminium interface like this:
I will layup onto the aluminium part, nót glue it in place after the epoxy has cured. I cannot find much information on the bond strength of the epoxy to the aluminium. I will etch the aluminium to increase bond strength and looking at the datasheet of epoxy adhesives (like 3M 1751B/A) that would give me an overlap shear of 2000Psi(14Mpa). Since the actual shear stress is more like 200Psi (1,4Mpa) and not much peel forces are to be expected I see no problems. The interlaminar shear strength of the epoxy I will use is around 4500Psi (31Mpa) so the thin layer of unreïnforced epoxy near the surface will not fail in shear either.
I know the values in the datasheet are based on single lap shear strength of two pieces of aluminium bonded with an adhesive epoxy. Can I assume the same bond strength for a laminating epoxy on aluminium? Am I overlooking anything else?
Thanks.