Shape memory alloy-actuated bistable composites for morphing structures

Venkata Siva C. Chillara; Marcelo J. Dapino

doi:10.1117/12.2296713

22 March 2018 Shape memory alloy-actuated bistable composites for morphing structures

Venkata Siva C. Chillara, Marcelo J. Dapino

Proceedings Volume 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII; 1059609 (2018) https://doi.org/10.1117/12.2296713
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2018, Denver, Colorado, United States

Abstract

Laminated composites with orthogonally-applied mechanical prestress have been shown to exhibit two stable shapes where each shape is influenced by only one prestrained lamina. The application of mechanical prestress is associated with an irreversible non-zero stress state; when combined with smart materials with controllable stress-states, this results in multifunctionality in morphing composites. This study presents an experimental characterization of the shape transition or snap-through in mechanically-prestressed bistable laminates. Measurements, conducted using tensile testing and 3D motion capture, show that snap-through in these laminates is a multi-stage phenomenon. An active bistable morphing composite is demonstrated using NiTi shape memory wire actuators in push-pull configuration; activation of one wire resets the second wire as the composite morphs. The set of shape memory actuators not only actuate the composite in both directions, but also act as dampers that enable vibration-free shape transition.

Citation Download Citation

Venkata Siva C. Chillara and Marcelo J. Dapino "Shape memory alloy-actuated bistable composites for morphing structures", Proc. SPIE 10596, Behavior and Mechanics of Multifunctional Materials and Composites XII, 1059609 (22 March 2018); https://doi.org/10.1117/12.2296713

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