J. Phys. IV France
Volume 115, June 2004
Page(s) 365 - 373

J. Phys. IV France
115 (2004) 365
DOI: 10.1051/jp4:2004115043

Finite element simulation of SMA microactuators with large deflection

B. Krevet and M. Kohl

Forschungszentrum Karlsruhe, IMT, Postfach 3640, 76021 Karlsruhe, Germany

For finite element simulation of shape memory actuators, a two-phase macromodel combined with a large deflection procedure is implemented in a FEM program for 3D mechanical analysis. The program is part of a tool for coupled electrical, thermal and mechanical problems. Details of the solution procedure are discussed. The model is used to investigate the performance of a shape memory alloy (SMA) microgripper. The microgripper is made of a monolithic SMA device of 2 x 5.8 x 0.1 mm 3 size comprising various integrated functional units like two microactuators for active closing and opening the gripping jaws and an optical slit. The simulated results are in quantitative agreement with experimentally determined data.

© EDP Sciences 2004