Re: question of principle

On 2007-05-15, jim beam <spamvortex@xxxxxxxxxxxxxxx> wrote:
ok, let's see who's awake.

imagine i have a strip of extruded 6106 aluminum bar 1" wide 1/4" thick
and 12" long. it's unanodized and effectively free of surface defects.

then, imagine i machine a sharp 1/16" wide "v" notch in the middle of
the bar to a depth of 50% thickness. finally, i load the bar in 4-point
loading with the two outer load points 1/4" from the ends and the two
middle load points centered and 2" apart. the notch is on the tensile
side with respect to load.

now, at what stress will the bar yield? is it:

a. ~100% of un-notched strength?
b. <50% of un-notched strength?
c. er, don't know?

What's 4-point loading?
.

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