Structural Characterization Of
Electro-thermally Driven Micro-actuators
With Immeasurable Temperature-dependent
Material Characteristics
Author(s)
W. Szyszkowski & D. Hill
Abstract
Multi-cell cascaded Electro-Thermal Micro-Actuators (ETMA) made of nickel
alloys are analyzed by the finite element (FE) method. The computer simulation
runs over the electrical, thermal, and mechanical phases of the ETMA
operations. The main challenges of modeling are discussed. Some of the
material’s parameters such as the electrical resistivity, thermal expansion
coefficient and emission are strongly temperature dependent. Furthermore, any
measurements of such dependences are complicated by a magnetic phase
transition occurring in nickel within the operating range of temperature. All the
properties are sensitive to a particular composition of the material. The surface
convection is additionally shape-dependent and, mainly due to small dimensions
of the actuators, cannot be determined experimentally with sufficient accuracy.
For the above reasons the use of the material data estimated from the available
literature usually does not render reliable simulations.
In the approach proposed the material characteristics of the ETMA considered
are determined by utilizing the fact that for a given applied voltage the total
current and displacement in the real actuators (performance parameters) are
measured with a relatively high precision. Similar performance parameters, i.e.
the total current and displacement can be obtained as output from the FE
simulation in which some important material properties of the actuator’s model
are assumed in a parametric form (material’s parameters). The FE simulation
procedure is integrated with these real measurements in such a way that the
Keywords
micro-actuators, finite elements, electro-thermal-mechanical fields, uncertain material characteristics
Related Book
Other papers in this volume
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