Re: Some bonding advice

Greg Norman

Without going into the details of the properties of anodized aluminum vs non-anodized bonding, I can tell you my unscientific garage applications of both show the same result with MGS epoxy and glass - no joy. Aluminum to laminate epoxy bond sucks.
Like the plans show in many places make dents, holes, and yes-rivets, bolts, extrusions to prevent rotation.

Greg Nornan

On Mon, Oct 18, 2021, 11:53 PM David A Froble <davef@...> wrote:
I'm back playing with my learning project.  Got a question.

I have a piece of 1.125 dia anodized aluminum tubing, which will be bonded
into a composite structure.  I'm worried about the bond breaking loose,
and the tubing turning in the structure.

I don't know if my concern is valid.  Perhaps the bond will be strong enough.

I have considered some type of pins in the tubing, AN3 bolts for example, to aid
the bonding.  Should I worry about this?  If using the bolts, is there any better
way to position them.  I also worry that the fiberglass will just fit over the end
of the bolts, and not really get a good bond.

Any advice?

David Froble                       Tel: 724-529-0450
Dave Froble Enterprises, Inc.      E-Mail: davef@...
DFE Ultralights, Inc.
170 Grimplin Road
Vanderbilt, PA  15486

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