Internal friction and heat generation cause a deviation from perfect elasticity, resulting in the hysteresis loop in the stress-strain curve.
The damping capacity ψ is:
ψ = ΔW/W
where W is the initial strain energy and ΔW is the energy lost during one cycle of oscillation.
Some damping capacities of common materials are:
There is some tendency for damping capacity to increase with at higher stresses. Damping also depends on temperature, strain rate and other parameters.
References:
Maringer, Damping Capacities of Materials
See also: Damping References
– Tom Irvine
Thanks Tom, Reading your posts is always a pleasure 🙂 Best regards Stefano
As always , very nice summaries as always. I was wondering , what kind of license do I need for Matlab / Matcad to run your scripts ? best regards, phil
You need the basic Matlab. No extra toolboxes are needed. My scripts can be downloaded from: https://vibrationdata.wordpress.com/2013/05/29/vibrationdata-matlab-signal-analysis-package/ There is no license for my scripts.