Re: [PSUBS-MAILIST] endcap/bulkhead question

[Ian Roxborough <irox@ix.netcom.com>]

On Tue, 16 Dec 2003 10:16:38 -0800
Ian Roxborough <irox@ix.netcom.com> wrote:

> 
> Any additional stress (I'm not sure if there is any), could easy
> taken care of by a heavy frame stiffener/re-enforcing ring.

Warren you are correct here, where would be extra stress at the
joint of the end-cap and cylinder, but nothing that couldn't be
off set with a heavy stiffener.

Ian.

> As for the displacement, it reduces displacement meaning that not
> only have you eliminated most of the risk of end cap buckling, but
> your sub is now lighter.  And for useful space inside the sub, that
> is going to depend on how clever you get packing things in.
> 
> For people wanting to read more about inverting end-caps on submarines,
> I would recomend reading "Pressure Vessels, External Pressure
> Technology" by Carl T.F. Ross - Chapter 7 "Novel Pressure Hull Design"
> (page 280).
> 
>   Ian.
> 
> 
> On Tue, 16 Dec 2003 09:15:36 -0800 (PST)
> Warren Greenway <opensourcesub@yahoo.com> wrote:
> 
> > The junction between the caps and hull "tube" will be
> > under tremendous stress. There will be shearing forces
> > on the wleds. Also, you are creating less useable
> > interior space for a given displacement. I think those
> > would be some of the basic reasons. Reference Concepts
> > of Submarine Design for more specifics.
> > 
> > Warren.
> > 
> > --- Emile <2stroke@hetnet.nl> wrote:
> > > Hello all,
> > > 
> > > For my future psub I consider an inverted endcap or
> > > bulkhead 
> > > See the "drawing"of the pressure part.
> > > ______
> > > )_____(
> > > 
> > > At this configuration the sphere shelfs only have a
> > > tension loading what is preferrable.
> > > I lookt at almost every psub design on the site but
> > > no other sub has this configuration, exept for the
> > > Spurdog.
> > > Am I wrong in my toughts and are there high stresses
> > > in the sharp transition from the sphere shelf to the
> > > circular hull??
> > > 
> > > hope someboy knows,
> > > 
> > > Emile D.L. van Essen
> > > www.AiResearch.nl 
> > 
> > 
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