Ok, getting back on topic RE: the flattened tube end connection [smiley]
The referenced article analysis is above my head though the conclusion about leaving the outer edges as a stiffener seems like it would be an improvement. Got it and especially if the tube is in compression like the geodesic done example cited.
How about if the tube is in tension overall between the two end holes? Envision a wing lift strut for example. Taking this a bit further, would there be merit of inserting an additional plate-or-sheet material and welding it between the collapsed tube prior to drilling the hole bearing the connection point?
My question isn't theoretical. Case in point: lift struts on the M-19 Flying Squirrel. M-19 Flying Squirrel homebuilt Aircraft Project