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

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SUMMARY

The discussion centers on determining the Young's Modulus for plastics, with a specific inquiry about a calculated value of 10.9 GPa. Participants emphasize the variability of Young's Modulus across different types of plastics and recommend consulting resources like MatWeb, which provides mechanical properties for over 50,000 polymers. A suggestion is made to average values from multiple types of plastics to obtain a general stiffness value, as the specific type of plastic in question remains unidentified. The conversation highlights the importance of having access to specific material data for accurate comparisons.

PREREQUISITES
  • Understanding of Young's Modulus and its significance in material science.
  • Familiarity with polymer types and their mechanical properties.
  • Knowledge of material selection handbooks and resources.
  • Basic principles of mechanical engineering related to stiffness and elasticity.
NEXT STEPS
  • Research Young's Modulus values for specific types of plastics using MatWeb.
  • Explore polymer handbooks for comprehensive mechanical property data.
  • Learn about averaging mechanical properties across different materials.
  • Investigate the impact of plastic type on stiffness and elasticity in engineering applications.
USEFUL FOR

Material scientists, mechanical engineers, and students in materials science or engineering looking to understand the mechanical properties of plastics and their applications in design and analysis.

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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