Im needing a spring with at least a couple feet of deflection. An Infinite fatigue life is desired. Diameter a maximum of about 3.5 inches. Length is not an issue. It seems belleville washers may seem like my viable option. The buckling of compression springs at this length throws them out. Maybe very long extension springs at a small percentage of deflection for infinate cycles? My main question is as long as belleville washers are not stacked parallel is there still a damping effect and thus energy loss?
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