Crack Closure and Shape Restoration Using NiTi Shape-Memory Alloy
Because of the high actuation stress and high recovery strain, NiTi shape-memory alloy (SMA) has been proposed for shape/position control and crack closure in structures for many years. In this paper, we demonstrate the feasibility to use NiTi SMA for not only crack closure, but also shape restoration in a silicon/nanoclay composite beam. Instead of embedding SMA into the beam, we use a piece of external SMA wire so that the expensive NiTi SMA can be reused. In addition, both shape restoration and crack closure can be achieved even when the beam is still in working condition, i.e., with external load applied.
L. Sun et al., "Crack Closure and Shape Restoration Using NiTi Shape-Memory Alloy", Advanced Materials Research, Vols. 261-263, pp. 721-724, 2011