Bonding Solid rod inside of tube

[jplay2519]

I have an aluminum member that is hollow and we need to reinforce it in order for the cantilever from the base to work. The client has proposed using a 12" solid member inside the tube and just sliding it over but as we all know I need composite action in order to make that work, I can't just have them sliding over each other. I'm trying to find a way to bond these two, I'm thinking a metal epoxy but not sure for structural purposes what kind to use. I don't want to just use jb weld that I can get from walmart, want something that's used for structural purposes (jb weld may well but and I'm being ignorant but I just have never seen it in any structural conversations). If anyone has any suggestions I'd appreciate it. The base will be grouted into concrete core.

 

[Tomfh]

A bucket full of thin epoxy should do it. Pour it in with a funnel/tube.

Here is a common product used in Australia, as an example:

http://megapoxy.com/product/megapoxy-h/

If the rod isn’t aluminium then I’d find a way to keep the metal separate.

 

[dik]

Use tube rather than solid... careful for the creep characteristics of the epoxy.

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik

 

[jplay2519]

Thanks guys! dik are you saying use another tube for reinforcement? Is that to save on material or another reason? I think they wanted to do stainless steel instead and alumnimum main member but there isn't a way to keep the metals separate, I need them to act compositely and they will be sliding over each other tightly.

 

[3DDave]

One concern is the sudden change in section properties at the end of the solid rod - it's a great place to generate a fatigue crack. Stepping that down is a help, but creating an internal taper has some expense to it.

 

[dik]

Tubes are nearly as strong as solid rods at a fraction of the weight...

Rather than think climate change and the corona virus as science, think of it as the wrath of God. Feel any better?

-Dik