A new way is presented to restrain the SMA fibers from being unglued that the fiber is knotted at the both ends.

On basis of a thorough comprehension and analysis of the overseas smart composite structure study,this paper focus on the experimental study of extended effect of v-notch in composite materials controlled by knotted shape memory alloy fiber and the test of material characteristic parameters.

The phenomena that the hook strength decreases continuously and the knot strength increases at first, and furthermore decreases with the twist increases have been observed through the knot strength and the hook strength experiments of the twisted aramid filaments.