Marc
As a mechanical engineer, the texts I found most helpful were two old
naval engineering text. Actually Alec Smyth put me on to them several
years back.
For the concepts and equations for designing the pressure hull, I like:
1. *Principles of Naval Architecture* - John P. Comstock (editor).
Chapter 8 of the text is titled "Submarine Pressure - Hull Design"
I found this very useful in designing my boat pressure hull. This
text is particularly good at explaining the structural loads on
the hull and failure modes with some very nice pictures of failed
reinforced pressure hulls. While it does not derive the governing
stress and strain equations, it does give them with quite a bit of
discussion to help understand how they are applied. As this book
was written in 1967, it is before the days of Finite Element
Analysis (FEA). The text is quite helpful in understanding the
equations used in the ABS Rules for Building and Classing ---
Chapter on metallic pressure boundary components which I found to
be quite terse. The analysis and discussion presented are
predominately for axisymmetirc externally pressured reinforced
cylindrical shells. To me the best way forward is use this text to
make the initial design of the pressure hull along with the ABS
spreadsheet, then go back and use an FEA tool and model the design
to look for any stress anomalies. This book is out of print but
you can usually find it at Amazon.com for $60-100. .
For equilibrium and stability concepts and calculations, I like:
1. *Fundamentals of Construction and Stability of Naval Ships*" by
Thomas Gillmer. There are three chapters that are particularly
useful . Chapter 7 - Equilibrium and initial stability, Chapter 8
- Overall Stability and Chapter 9, Dynamic Stability. Likewise,
this book is out of print, but you can still find these used on
Amazon.com $15-$20
.
I am sure there are newer text out there but these are the ones I used.
The nice part about these text is because they are old, they are
inexpensive.
Cliff
------------------------------------------------------------------------
*From:* Marc de Piolenc <piolenc@archivale.com>
*To:* personal_submersibles@psubs.org
*Sent:* Wed, January 12, 2011 8:09:22 PM
*Subject:* Re: [PSUBS-MAILIST] Best source for structural calculations
Let me see if I can be a bit clearer.
Of course our field of interest draws on many fields of science,
engineering and technology. I have all the basic science and engineering
references, plus some semi-specialized books on naval architecture and
so on. My own specialties are aeronautical engineering (lighter than
air) and aero-propulsion, especially ducted propulsors. I also have a
long-standing interest in shell structures and in ferrocement shells for
both housing and boats.
What I'm looking for is a text that treats submarine structures
SPECIFICALLY, starting with the basic system of forces acting on the
pressure hull (which in most manned subs will be the major structural
member) and progressing from there, first to the exact mathematical
relations used in stress analysis OF THIS PARTICULAR TYPE OF STRUCTURE
SUBJECTED TO THIS SYSTEM OF FORCES, and from there to the approximate
formulas needed for preliminary design.
I have what I THINK is a valid picture of the forces on the pressure
hull, and I've been accumulating literature on axisymmetric structures
under combined - external pressure and axial compresion - loading, but
there's longitudinal bending to be taken care of, too, and I want to
make sure I'm on the right track, because I'm basically self-taught in
structures.
Thanks in advance.
Best,
Marc
On 1/13/2011 8:16 AM, Sean T. Stevenson wrote:
> Marc - I'm not entirely sure what you're looking for here. From your
> description, I'm tempted to suggest going back to the basic physics -
strength
> of materials, mechanics, thermodynamics and so forth, but I'm
guessing that
> this is not what you mean. Are you looking for a single reference
that covers
> mechanical engineering topics? References like the Machinery's
Handbook have
> most of the relevant formulas - post-derivation. If you want to
understand
> structural calculations all the way from first principles, then you
need a
> background in engineering or mathematics, because there is a fair bit of
> calculus involved. Or do I completely misunderstand your intent?
>
> -Sean
>
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