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UFO

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- TL;DR Summary
- Coil spring change in first natural frequency, and hysteresis with use and age.

Could anyone help me with some info on compression helical springs. First I would like to know if this type of spring would even have any appreciable histeresis when new, and if so does it does it grow with repeted use and age. I would also like to know if there is any relationship beteen the first natural frequency, and hysteresis, and, or with use and age. Does this type of spring have any change in properties when used hard, in other words does it wear out at all before it reaches its fatigue end of life and breaks, other then a slight bit of yield or sag. I have found conflicting results on this, and the formula for the first natural frequency does not reference any use cycles on the spring.

Thanks for any help

Thanks for any help