You forgot to allow for the metal insert on the back side.  That, and
Acrylite FF is much more brittle than the soft plastic the coolant tubes are
made of.

I still ain't worried about Dixie's tubes...   ;)

On Wed, Mar 2, 2011 at 3:31 PM, David Beierl <dbeierl@attglobal.net> wrote:

> 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
>

--
Jake

1984 Vanagon GL 1.9 WBX - 'The Grey Van'
1986 Westy Weekender/2.5 SOHC Subie - 'Dixie'

Crescent Beach, BC

www.thebassspa.com
www.crescentbeachguitar.com
http://subyjake.googlepages.com/mydixiedarlin%27