At 01:16 AM 3/1/2011, Jake de Villiers wrote:
>Hmm.  When I re-did Dixie's pipes I put a couple or three rivets
>into each insert after the heat and beat treatment.  I really don't
>see how there could be any stress risers created in the holes since
>the rivets are a compressive force on the flat plastic.

The plastic isn't flat, of course; it's a ~3/4" radius circle.  But I
was curious about this so I did a little checking on a piece of 1/8"
acrylic and found the results interesting.  Have a look at
https://picasaweb.google.com/dbeierl/StressInPlasticFromPopRiveting#
.  I'd expect the effect to be more pronounced since the pipe isn't
flat, but the propagation distance to be less because of the material.

Yours,
David