Re: Determining balsa stiffness

From: Mark <f1diddler_at_yahoo.com>
Date: Sat, 14 Jan 2006 03:17:20 -0000

--- In Indoor_Construction_at_yahoogroups.com, "markdrela" <drela_at_m...>
wrote:
d> One possible problem with this buckling-load method is that the test
> piece must be very straight, and the load at each end must the applied
> at the center of the beam. Any built-in beam curvature or off-center
> end load will cause premature buckling and an underpredicted modulus.

Even a seemingly straight piece sometimes yields two buckling load
readings depending on which direction/side you allow the center to
buckle out. I usually average them--not that this a precise solution,
but I'm usually just comparing several pieces of sheets against each
other. Close enough for me.
Mark F1diddler
Received on Fri Jan 13 2006 - 19:18:16 CET