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Author Question: Describe how ultraviolet light degrades plastics and why it does not generally degrade metals. ... (Read 17 times)

robinn137

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on: Aug 19, 2018
Describe how ultraviolet light degrades plastics and why it does not generally degrade metals.
 
  What will be an ideal response?

Question 2

A stress-strain experiment was done on a plastic and the following data was noted on the plot of the experiment: ultimate tensile strength = 9000 psi, yield strength = 5000 psi, proportional limit = 4000 psi, strain-to-failure = 0.025, strain at yield = 0.020, stain at proportional limit = 0.015 . The original length of the sample was 4 inches. What was the modulus?
 
  What will be an ideal response?


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jordangronback

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Reply #1 on: Aug 19, 2018
Answer to Question 1

Ultraviolet

Answer to Question 2

The modulus is calculated by examining only the slope of the stress-strain curve before yield, that is before and non-linear behavior is seen. Hence, the slope at the beginning of the experiment is stress at yield (5000 psi) divided by strain at proportional limit


robinn137

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Reply 2 on: Aug 19, 2018
Gracias!

frankwu0507

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Reply 3 on: Yesterday
Great answer, keep it coming :)

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