Fe-SMA steel rebar, also known as shape memory alloy steel rebar, is a novel rebar material that possesses unique properties such as superelasticity and high damping capacity.

High yield stress: The yield stress of Fe-SMA rebar is significantly higher than that of ordinary rebar, meaning Fe-SMA rebar can withstand greater deformation without undergoing plastic deformation.
Low elastic modulus: The elastic modulus of Fe-SMA rebar is lower than that of ordinary rebar, which means Fe-SMA rebar can absorb more energy during deformation.
High recovery stress: Fe-SMA rebar has a high recovery stress, which means it can quickly return to its pre-load shape after unloading.

Internal friction: The internal structure of Fe-SMA rebar contains a large number of dislocations and twins. These dislocations and twins generate friction during vibration, thereby absorbing vibrational energy.
Phase transformation: Fe-SMA rebar may undergo phase transformation during vibration, and this process also absorbs vibrational energy.

Superelasticity:: The superelasticity of Fe-SMA rebar provides the material with high tensile strength within a relatively small deformation range. When deformation exceeds a certain range, the tensile strength of the material rapidly declines, leading to reduced elongation.
Phase transformation: During the tensile process, Fe-SMA rebar may undergo phase transformation, which can increase the brittleness of the material and reduce its elongation.
Processing techniques:The processing techniques of Fe-SMA rebar can affect the material's elongation. For example, cold working can reduce the elongation of the material, while hot working can increase it.