Official Answer
Answer
Hysteresis in nested wave springs is caused by inter-turn friction as the layers slide against each other during compression. To minimize this, engineers should specify a high-viscosity lubricant (like a Molybdenum Disulfide grease) between the turns. Additionally, the surface finish of the wire should be optimized (typically $16$ micro-inches or better). In precision medical devices, 'Dry Film' lubricants are often used to ensure a smooth load-deflection curve without the stick-slip effect that can plague high-load nested stacks.
