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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
>