Design of multi-state and smart-bias components using Shape Memory Alloy and Shape Memory Polymer composites: Fid-Bau Portal

Design of multi-state and smart-bias components using Shape Memory Alloy and Shape Memory Polymer composites

Ghosh, Pritha / Rao, Ashwin / Srinivasa, Arun R.

Highlights ► SMA and SMP can be combined to form a multifunctional smart material system. ► Describe a fabrication methodology for a SMA–SMP system. ► Establish design guidelines (1): T g programmed between M f and A s. ► (2): SMA reinforcements is determined by the matching component stiffness. ► Propose various ideas that can operate over three different temperature ranges.

Abstract A Multifunctional Smart Material System (MSMS) consists of two or more different smart material phases in the form of a hybrid system, in which every phase performs a different but necessary function. In this work, thermally responsive Shape Memory Alloys (SMAs) and Shape Memory Polymers (SMPs) are combined to form a MSMS. The transformation temperatures martensitic start (M s), martensitic finish (M f), austenitic start (A s) and austenitic finish (A f) of SMA and the glass transition (T g) for the SMP play a critical role in designing such a MSMS. Multi-state smart bias systems with varying stiffnesses can be obtained by varying the T g of SMP between the transformation temperatures M f and A f of SMA. Guidelines to form such MSMS have been established by estimating the volume fractions of the individual constituents. Various ideas for “smart-bias” tools/devices have been proposed, such that they can operate under three different temperature regimes, with one material constituent being passive and the other active at a given temperature.