Open AccessProperties of an extrusion energy absorber
Author(s) -
William H. Robinson,
L. R. Greenbank
Publication year - 1975
Publication title -
bulletin of the new zealand society for earthquake engineering/nzsee quarterly bulletin
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.917
H-Index - 36
eISSN - 2324-1543
pISSN - 1174-9857
DOI - 10.5459/bnzsee.8.3.187-191
Subject(s) - extrusion , body orifice , materials science , energy (signal processing) , composite material , work (physics) , hardening (computing) , coulomb , mechanics , mechanical engineering , physics , engineering , nuclear physics , layer (electronics) , quantum mechanics , electron
By pushing lead back and forth through an orifice the process of extrusion can be used to absorb energy. When the lead is extruded it recrystallizes immediately, thereby regaining its original mechanical properties. Rather than the energy absorber being limited by the strength and work hardening of the lead it is limited by the heat capacity of the device and is therefore able to absorb energy during a number of earthquakes. To date extrusion energy absorbers of 20 kN x 2 cm stoke to 200 kN x 26 cm stroke have been tested at rates of 2 x 10-8 to 60 cm/sec and they behaved
as "coulomb dampers" with nearly rectangular hysteresis loops and little
rate dependence.