Just a statistic brought down from the internet today to aid in the discussions factual side. Material Relative damping capacity Grey iron, coarse flake 100-500 Grey iron, fine flake 20-100 Ductile iron 5-20 Pure iron 5 Eutectoid steel 4 Aluminium 0.4 -- Richard Brekne RPT, N.P.T.F. UiB, Bergen, Norway mailto:rbrekne@broadpark.no http://home.broadpark.no/~rbrekne/ricmain.html
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