>From: "Blasch, Larry" <LBlasch@opw-fc.com>
>To: "'Elaine Hunt'" <ehunt@ces.clemson.edu>
>Subject: RE: creep values
>Date: Tue, 27 Mar 2001 10:21:49 -0500
>X-Mailer: Internet Mail Service (5.5.2653.19)
>
>Elaine,
>
>Due to some sort of e-mail conflict between my firewall and the RP-ML
>system, I continue to be unable to send anything to the RP-ML list directly,
>even though I can receive and respond to the originator. You may forward
>this on to the list.
>
>I have been working with SOMOS 8110 resin, and it exhibits different
>hardness, flexural, tensile and creep values depending on the post
>processing. (I usually build using the EXACT Build style)
>
>I have been conducting experiments on various build styles and post
>processing procedures as time permits. I was hoping to have results to
>present at the SME conference in Cincinnati but unless my work schedule
>changes radically, that won't happen.
>
>Although I have not been conducting creep tests, I can add that to my list
>of things to test:
>
>Shrinkage (dimensional stability)
>Flexural strength
>Elongation
>Tensile strength
>Shear Strength
>Hardness
>Optical properties
>Chemical/water sensitivity (weight gain/loss and dimensional change)
>Heat Deflection Temperature
>Creep
>
>And whatever else that I have time for. (Any other suggestions?)
>
>I have been attempting to conduct the tests per the ASTM standards, but my
>time and machine availability is severely limited. Perhaps one of your
>students would be interested in working on this also?
>
>I can share with you some of the results that I have but most of it is not
>to any standard.
>(I was attempting to stiffen the parts on an ad-hoc basis.)
>
>I worked with Michelle Wyatt at DSM/SOMOS and she passed along a basic
>process that we used to alter the properties of the resin.
>
>Excerpt from e-mail to Michelle Wyatt:
>
>Just thought I would pass along the results of my first attempt at
>stiffening parts.
>
>We ran the parts in our environmental test chamber as you suggested. (1 deg.
>C/min. up to 120 deg. C. We held 120 deg. C for 15 minutes, and then cooled
>the parts down to ambient at the same rate) This produced some interesting
>results.
>
>Based on the following test method, the parts increased in hardness by
>almost 3:1
>
>I used a modified Shore Scleroscope method... I dropped a half inch dia.
>steel ball bearing from a height of 30 cm onto a uniform flat surface part
>which was resting on a marble top lab bench, and measured the height of the
>bounce before (5.5cm) and after thermal post cure (16.5cm). (I know it's an
>archaic test, but it was simple to do and produced repeatable results)
>
>The parts retained some resilience and flex and did not become super
>brittle. I plan to do more accurate testing next, but I was amazed by the
>results.
>
>The process stiffened up the parts but their shapes don't lend themselves to
>accurate testing for flex modulus. From what you described, I was expecting
>more brittle parts.
>
>They turned an ugly carmel color instead of bluish white.
>
>Sincerely,
>
>Larry Blasch
>
>Lawrence R. Blasch
>Design Engineer
>CAE Systems Administrator
>
>OPW Fueling Components
>P.O. Box 405003
>Cincinnati, OH 45240-5003 USA
>Voice: (513) 870-3356
>Fax: (513) 870-3338
>
>*****************************************
>* "Always remember you're unique,*
>* just like everyone else." *
>*****************************************
>
>
>
>-----Original Message-----
>From: Elaine Hunt [mailto:ehunt@ces.clemson.edu]
>Sent: Tuesday, March 27, 2001 7:56 AM
>To: rp-ml@bart.lpt.fi
>Subject: Re: creep values
>
>
>At 04:01 PM 3/26/01 -0600, David K. Leigh wrote:
> >This one is too easy. Good thing it didn't come around haloween.
>
>
>
>
>from all the thundering responses I gather that no one has
>
>thought about creep values
>doesn't care about them
>does not use the material for direct manufacturing
>will never use RP for manufacturing
>you love the current material properties
>
>
>comments please?
>
>
>elaine
>
>
>
>
>
>
>
>
>*******************************************************************
>Opinions, suggestions, and other controversial matter VOID where prohibited.
>
>"Great spirits have always encountered violent opposition from mediocre
>minds.
>Few are those who see with their own eyes and feel with their own hearts.
> The important thing is to not stop questioning. " --Albert Einstein--
>******************************************************************
>Elaine T. Hunt, Director elaine.hunt@ces.clemson.edu
>Laboratory to Advance Industrial Prototyping
>Clemson University 206 Fluor Daniel Bldg.
>Clemson, SC 29634-0925
>864-656-0321 (voice) 864-656-4435 (fax)
>http://www.vr.clemson.edu/credo/persall/persall.html
>http://www.vr.clemson.edu/rp/
>http://www.vr.clemson.edu/credo/rp.html
>
>
>
>
>For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
*******************************************************************
Opinions, suggestions, and other controversial matter VOID where prohibited.
"Great spirits have always encountered violent opposition from mediocre minds.
Few are those who see with their own eyes and feel with their own hearts.
The important thing is to not stop questioning. " --Albert Einstein--
******************************************************************
Elaine T. Hunt, Director elaine.hunt@ces.clemson.edu
Laboratory to Advance Industrial Prototyping
Clemson University 206 Fluor Daniel Bldg.
Clemson, SC 29634-0925
864-656-0321 (voice) 864-656-4435 (fax)
http://www.vr.clemson.edu/credo/persall/persall.html
http://www.vr.clemson.edu/rp/
http://www.vr.clemson.edu/credo/rp.html
For more information about the rp-ml, see http://ltk.hut.fi/rp-ml/
This archive was generated by hypermail 2.1.2 : Fri Jan 04 2002 - 09:57:00 EET