What is the Young's Modulus for Plastics and How Can I Find an Accurate Value?

AI Thread Summary
Young's Modulus for plastics varies significantly depending on the type of plastic, with the user's calculated value of 10.9 GPa being plausible. Accurate stiffness values can be found in reference books and online databases, such as MatWeb, which lists mechanical properties for over 50,000 polymers. The discussion emphasizes the importance of identifying the specific type of plastic to obtain a relevant value, suggesting that averaging values from multiple plastics could provide a general estimate. Participants express frustration over the lack of specificity in the inquiry, noting that those without access to the material cannot provide a definitive answer. The conversation hints at potential coursework implications, raising questions about the user's intent.
mathsgeek
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Young's Modulus for Plastic URGENT

I was wondering what is the young's modulus for plastics because I am looking all over the internet and can't find anything? Its because in an experiment i calculated it to be 10.9GPa but i need to compare it to an actual value. Thanks
 
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What type of plastic? There are many types, each with its own characteristic stiffness. (10.9 GPa wouldn't be unusual.)

You can find stiffness values in many reference books; search for handbooks on polymers/materials selection/mechanical engineering.
 


Try http://www.matweb.com/search/MaterialGroupSearch.aspx" also.
 
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Well i just need to knowthe literature value for plastics (most of them i would believe) so where on that site and internet could i find that because I've got a materials science and engineering textbook and it isn't in there?
 


Q_Goest's link takes you to a site with mechanical properties for >50,000 polymers. It would be more effective if you explained why the earlier answers are unsatisfactory instead of just continuing to bump the thread.
 


Because i need a general value as we arent told what type of plastic it is.
 


Pick ten at random and take the average value. Actually, this is a good idea for any engineer, if just to know whether plastics have a typical stiffness of 1kPa, 1MPa, or 1GPa.
 


mathsgeek said:
Because i need a general value as we arent told what type of plastic it is.

Let me see if I get this straight. You have a table for all sorts of kinds of plastic. You, who presumably has access to the plastic in question, can't decide what number to use. So you ask us, people who don't have access to the plastic in question, which number to use? How can we possibly be in a better position than you are?

Q_Goest gave you the best possible answer.

By the way, is this coursework? It's starting to sound like it.
 

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