Re: Possibly interesting balsa test

From: torqueburner <beammeup_at_fast.net>
Date: Fri, 30 Jun 2006 15:39:38 -0000

Hi, Bill - I found this quite interesting.

--- In Indoor_Construction_at_yahoogroups.com, "Bill Gowen" <b.gowen@...> wrote:
>
>. . . One piece was .130 x .245 x 12" . . .It buckled toward the thin side at 180g and
>toward the thick side at something over 500g. . . .The final diameter was .195". The
>buckling load for this piece was 360g. . .


Do I remember correctly that the buckling resistance is proportional to the square of the
dimension parallel to the buckling force? That seems to fit your measurements for the
rectangluar piece pretty closely (the larger dimention would buckle at (.245/.13) squared
*180, which is about 640 g.

Using these numbers, a piece with a height of about .18" would buckle at 360 g, same as
the round one. And since the round piece is only .195 in the center, with a decreasing
"height" as you move outward, it has an overall effective height that is less than .195"
Does this make sense?

It would be interesting to test a piece that is .18" high and see if it buckles somewhere
around 360 g.

Dave Drummer
Received on Fri Jun 30 2006 - 08:39:44 CEST