Thin Hollow
Attachment 28525
Thick Hollow
Attachment 28526
Thin Filled
Attachment 28527
Thick Filled
Attachment 28528
Printable View
Thin Hollow
Attachment 28525
Thick Hollow
Attachment 28526
Thin Filled
Attachment 28527
Thick Filled
Attachment 28528
This is all really fascinating, thanks for sharing! So I made an 8 x 4 machine frame from I beam profile filled with concrete mix (vid of it being made, concrete mix design details etc & it cutting: https://youtu.be/cqYJS27aC4w ) and wish I had made more video recordings of how the concrete changed the vibration characteristics. I actually used a vibration monitor on my smartphone, and had the data, but that phone got hit by a freak flying phone seeking branch when we cut a dead ash tree down :(
I suspect you have seen it, but I haven't seen mention of it here yet: Bamberg's "Principles of Rapid Machine Design" In it he describes a similar concrete-filled tube, but he adds constrained layer damping... Worth a look if you haven't seen it - page 96 on.