Plastic Industry

Posted:  23 Jun 2010 19:28
Need some help on how to calculate creep distance over a specified period of time. 
temperature, load, creep modulus, and wall thickness are known.

any help is appreciated

Scott (sadams@metroplastics.com)
Posted:  24 Jun 2010 15:58   Last Edited By: UW Stout
Scott,

Please see link below for a document that might help you. It should provide a good start. I would also get the material manufacturer’s input.

Let me know if you need additional information. Please pass along my greetings to Lindsey.

Thanks,

Jerry

Jerry L. Wickman Ph.D.
Professor Plastics Engineering
University of Wisconsin - Stout
Menomonie, Wisconsin
54751
715-232-1179
www.uwstout.edu/programs/bspe

http://www.mappinc.com/images/uploaded/Creep% ...
Posted:  24 Jun 2010 16:02
Scott -

I've researched this topic before and wrote a technical article on CREEP and how to calculate its value.

The information is published here:
http://www.steinwall.com/ART-creep.html

Let me know if you have any questions.

Jeremy Dworshak
Steinwall, Inc.
Posted:  28 Jun 2010 12:37
To answer your question, it is important to understand which type of creep you are trying to estimate.  Creep data can be run in compression, tension or flexure.  Generally all will calculate deformation versus time. Recently, an accelerated method which uses time-temperature superposition has accelerated estimation of creep versus the tradational loading techniques.  Lastly, another factor called creep rupture is important, and that is after a certain amount of strain, samples fail catastrophically.

Mike Balow

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