Hello David,
This seems to be a typical failure mainly caused by notching effect due to
stress concentration.
In my humble opinion you should correct it by doing the following :
- make the root of the groove ( milled recess ) below the bolt not circular
( see below ) ( I would make a pattern of cardboard )
- use unidirectional CarbonFibermaterial
also at the front face and the rearface ( inside the groove )
( I would lay each with three small tapes; one in the middle 0 degree;
two in parallel to the outside angle )
To shape the groove below the bearing bolt
you should use the very easy method of Prof. Mattheck.
( Mattheckâs 'method of tensile triangles' )
This can be done very simply without a computer only by
using a set square.
He developed a very simple Method to prevent stress peaks
in components based on looking at the growth of trees.
http://www.bio-pro.de/en/region/rhein/magazin/01793/index.html
http://www.experteez.de/publikationen/docs/NAFEMS/NAFEMS_2001.pdf
http://www.vtaseminare.de/english/english2.htm
http://www.xperteez.de/publikationen/docs/NAFEMS/NAFEMS_2001_PPT.pdf
http://www.tecdesign.uni-bremen.de/FG10/hausarbeiten/bionik_0506/maschinen_wachsen_wie_baeume.pdf
http://www.remame.de/page3/page9/page14/page14.html
http://www.imlaustralia.com/html/the_face_of_failure.html
with best regards from Friesland
Helmut
Am Montag, 21. Juli 2008 schrieben Sie:
> Hello Greg,
>
> We have not heard from you in a long, long time.
>
> I was out doing some sailing in very light winds today and to my
> surprise...have a look at what I discovered when I came to the beach!
>
> I'm not sure what went wrong other than the fibre orientation. What are
> your thoughts?
>
> Lucky it was light winds. I could have lost my mast.
>
> David Lindsey
> Vancouver, B.C.
mattheck_a1c_166x180.jpg
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