Abstract
We report on the intrinsic or material quality factor (Q-factor)of a number of different materials, possible suited for the construction oflow loss flexures. Clamped foil flexure membranes made from titanium, a glassyalloy, Cusil and Havar (high strength non-magnetic alloy), as well asmonolithic flexure membranes made from titanium, niobium and Marval 18(maraging) steel, have been tested. The results show that the highestintrinsic Q-factor occurs for monolithic flexure membranes constructed fromniobium, with maraging steel also yielding a high intrinsic Q-factor. Othermaterials tested were shown to be significantly inferior. For a pendulum ofmass 10 kg, with a stress safety factor of δ = 0.3, we predict a maximumQ-factor of 3.1×107 for a niobium flexure, and 2.9×106 for amaraging steel flexure.
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