J. Phys. IV France
Volume 115, June 2004
Page(s) 343 - 349

J. Phys. IV France
115 (2004) 343
DOI: 10.1051/jp4:2004115040

An investigation on scalability of SMA composite by roughness evaluation of SMA wires

L.F. Campanile, J. Mircea and S. Homann

Deutsches Zentrum für Luft-und Raumfahrt e.V. (DLR), Lilienthalplatz 7, 38108 Bkaunschweig, Germany

Composites with embedded SMA wires as actuators work as solid-state actuators, and are therefore able to control the shape of a structure without requiring moveable parts. An important aspect to compare the behaviour and efficiency of such active structures as a function of size is scalability. In this framework it is very important to qualify the interface between SMA wires and matrix. An investigation on scalability of SMA composites by roughness evaluation of SMA wires is presented in this paper. The authors measured roughness of thin Ni-Ti wires with different diameters (0.05 mm, 0.075 mm and 0.1 mm) by processing SEM (Scanning Electron Microscopy) photography with a special software package. During SEM photography of SMA wires, in the vacuum room of SEM microscope a relevant part of the electron beam emission is transformed in heat.

© EDP Sciences 2004