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RE: [PSUBS-MAILIST] Information Needed for HDPE
Steve
The wall thickness of the pipe comes to .63.
There are several applications that I'm looking at. The 1st is a battery
housing that will be on the outside of a two man submersible. I'm also
looking at a diver propulsion vehicle.
Alex
-----Original Message-----
From: owner-personal_submersibles@psubs.org
[mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven Mills
Sent: Monday, June 09, 2003 3:21 PM
To: personal_submersibles@psubs.org
Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
>From: Alex Varouxis <alex@associateddesign.com>
>
> When I plug the numbers in to Row 24 column B (Cylinder Yielding [T/OD]
> reads "NUM!" This happens when I put in the Yield stress of 0.10E6
>
Alex, I think the numbers are out of range for the scope of the cell.
The spreadsheet needs to be tweaked a bit. I'm going to work on it.
If you're familiar with Excel try working with the cell range. If you do, I
would
setup a dummy sheet to rework it and keep the original intact.
Which brings up a question.
You have the pipe at 10.75 inches OD and I.D. of 9.49 inches which
brings the thickness at 1.26 inches. Is this a stock pipe? Or 2 pipes,
one fitted inside the other?
Is this a containment vessel that will sit outside a hull? [ like a thruster
cowling, duct, sensor or camera case ? ]
>
> Thanks for all your help on this
>
No problem. This is helping me, too. I figured it was time for me to
start thinking pSub and getting things on paper instead of just talking
and wishing. I need to get my brain and hands working!
Thanks, --Steve
> -----Original Message-----
> From: owner-personal_submersibles@psubs.org
> [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven Mills
> Sent: Sunday, June 08, 2003 1:50 PM
> To: personal_submersibles@psubs.org
> Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
>
> >From: Alex Varouxis <alex@associateddesign.com>
> >
> > Below are the Mechanical properties of the pipe. I'm unclear what I
should
> > input into in your xls file. I have located the Posions Ratio which is
.4.
> >
> > Alex
>
> First, don't take these values as gospel. I have a range for HDPE of
> .40 to .46 Each manufacturer has a ratio determined by their own
> labs and tests. So, consider these values as approximations. And
> don't *completely trust* programs like this XLS calculator.
>
> However, my tables for Polyethylene HDPE is .40
> Young's Modulus is 0.29E6 and the Shear Modulus is
> 0.10E6 ( 0.71 GPa )
>
> *[ anyone...jump in and please correct this if you have
> different values ! ]*
>
> For the "xls" calculator these are the values to input in
> Row 24 ( the blue highlights ).
>
> However, I'm still looking for that other program which might be
> better suited to your project.
>
> --Steve
>
>
> > Mechanical Properties
> >
> >
> > Hardness, Shore D 63 - 68 63 - 68 Average = 65.6; Grade Count =
12
> > Tensile Strength, Ultimate 31 - 34 MPa 4500 - 4930 psi Average
=
> > 32.5 MPa; Grade Count = 12
> > Tensile Strength, Yield 19 - 23 MPa 2760 - 3340 psi Average = 21.6
> MPa;
> > Grade Count = 12
> > Elongation at Break 400 - 800 % 400 - 800 % Average = 770%;
> > Grade Count = 12
> > Flexural Modulus 0.79 - 0.9 GPa 115 - 131 ksi Average = 0.85
> GPa;
> > Grade Count = 12
> > Izod Impact, Notched 3.2 - 5.3 J/cm 5.99 - 9.93 ft-lb/in Average
=
> > 3.9 J/cm; Grade Count =
> >
> >
> > -----Original Message-----
> > From: owner-personal_submersibles@psubs.org
> > [mailto:owner-personal_submersibles@psubs.org]On Behalf Of Steven Mills
> > Sent: Saturday, June 07, 2003 10:46 PM
> > To: personal_submersibles@psubs.org
> > Subject: Re: [PSUBS-MAILIST] Information Needed for HDPE
> >
> > >From: Alex Varouxis <alex@associateddesign.com>
> > >
> > > > Thanks for the calculator it will be useful for future use.
> > > > Unfortunately the web site
> http://www.matweb.com/search/SearchSubcat.asp
> > > > that you and Rodger directed me to does not contain the required
data
> > for
> > > > Pipe Grade HDPE.
> > > > Any suggestions?
> > > >
> > > > Alex
> >
> > First, I'm still looking for my data / tables. But !...go back to
> "matweb"
> >
> > http://www.matweb.com/search/SearchSubcat.asp
> >
> >
> > under the search for "Thermoplastic Polymers" go down to the
> > "polyethylene" . HDPE is listed in this category. However, be
> > ready for a long list ! Look on your HDPE pipe for any coding.
> > This may give you a clue as to the type.
> >
> > --Steve
> >
>
>