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Rate-Sensitive Behavior of Plastics: Lessons from Daylight Saving Time and Silly Putty

from Plastics Today

In a July article, Plastic News discussed the toughness of plastic materials, and discussed some of the various test methods used to measure and quantify toughness. Plastic News also discussed the concept of toughness being a rate-sensitive behavior—basically a mechanical measurement that changes depending on how fast (or slow) forces are applied. This concept of rate-sensitive behavior is not an annoying conversation to be had with Dr. Sheldon Cooper — it is a fundamental principle that affects the behavior of all plastic materials. To put it simply and clearly: The measured mechanical properties of a plastic material —any plastic material — will depend on the rate at which loads are applied. more

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