Damping Properties of Rubber: Understanding the Impact of Strain Amplitude

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The damping properties of rubber decrease with increasing strain amplitude due to mechanical and molecular factors. As rubber is stretched, the speed of wave propagation is affected by the tension, influencing internal friction and resulting in reduced damping. Additionally, the chemical and physical interactions during compression or stretching alter molecular alignment and Van der Waals forces. Understanding these interactions is crucial for comprehending the material's behavior under different strain conditions. Overall, the relationship between strain amplitude and damping properties is complex and involves both mechanical and molecular dynamics.
scriptymender
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Hey Guys,

Can anyone tell me why the damping properties of rubber will decrease as the strain amplitude increases?

Thanks
 
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Hi scriptymender,

A quick link to get some fundamentals in place.
http://en.wikipedia.org/wiki/Hysteresis#Hysteresis_in_mechanics

Not sure if you mean compression or tension.

There are a few effects that come in place as rubber gets stretched. Mechanically the speed of propagation of a wave in a string (v) is proportional to the square root of the tension of the string (F) (http://en.wikipedia.org/wiki/Vibrating_string), this affects the interaction time for internal friction and could result in a overall reduction.
A more detailed explanation should require a look on the chemical/physical interactions that take place while the material is compressed or stretched, witch affects molecule alignment (compression stretches and aligns too) and overall Van der Waals interactions.
 
Thanks a lot mate, I really appreciate your help!
 

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