Work Loop and Ashby Charts of Active Materials
Final rept. 27 Aug 2012-26 Aug 2013
NANYANG TECHNOLOGICAL UNIV (SINGAPORE)
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The use of active materials for structural applications is of interest for structural health monitoring and as adaptivemorphingshape changing materials found in aerospace structures. In this project detailed studies of the work-loop characteristics of active polymer-magnet composite materials Magpol were conducted and Ashby charts constructed to show performance metrics e.g., actuation stress, actuation strain, self-healing of iron-loaded compositions compared to other active materials. Multiple actuation modes, including novel coiling behavior, were observed in the composite systems under study. Magol maximum actuation frequency for dynamic properties of are up to 80 Hz, which is higher than earlier reported values for PVA hydrogel - Fe3O4 composites. In contrast to conducting polymer actuators that show shifting of strain profile and short life 10,000 cycles for strains of 2, Magpol composites actuate up to 24,000 cycles at 80 Hz without change in strain characteristics. Self-healing of Magpol prepared using ferrite nanoparticles of different Curie temperatures was examined after magnetic heating, near complete recovery was observed even after repeated damage.
- Laminates and Composite Materials