Factors effecting internal damping in aluminum

The internal damping of metallic materials varies with many different environmental effects. These are the frequency, amplitude of strain or stress, and temperature. In addition, internal damping is effected by corrosion fatigue, grain size, and porosity. The damping also depends on the number of fatigue cycles. There is a functional relationship among the damping, number of cycles and applied stress. In this study, these seven different environmental factors and their effects on the damping are analysed in the case of 6061 aluminum alloy. The relationships between the damping and every single effective factor are complex and vary depending on the aluminum type.