Paper
published at ICOMAT 92 (click to download)
Shock damping
in a Cu-Zn-Al Shape Memory Alloy
Jean
MULLER, Bernard DUBOIS, Jean CONDOURE, Jean-François FRIES
Laboratoire
de Métallurgie Appliquée, ENSCP, 11 rue Pierre et Marie Curie,
75231 Paris Cedec 05 France
Centre
de Recherches Matériaux, GIAT INDUSTRIES, Centre de Tarbes,
BP1450, 65014 Tarbes, France
In order to precise
high damping capacity of shape memory alloys (SMA), an extension
from internal friction to shock damping capacity is proposed.
From any metallic material submitted to a limited plastic
deformation at high strain rates (from 10-3 to 5000 s-1),
a damping power concert OMEGA-1 is introduced and related
to some aspects of the mechanical energy dissipation. Experiments
were performed with a quadrant shock pendulum and Hopkinson
split bars. In a Cu-Zn-Al SMA, adiabatic shear bands and shock-induced
martensites are observed. This would be an accommodation process
for shock damping. Quantitative analysis of martensite is
provided using X-Ray diffraction method.
