Research On Energy Storage Ejection And Self-sensing Interwoven Network Of Superelastic Shape Memory Alloy Wire

Superelastic shape memory alloy(SMA)wire is a type of memory deformation material with high resilience and energy density.With its self-sensing property based on electrical resistance,it has potential value in the field of monitoring.However,due to the hysteresis characteristics of Superelastic SMA wire,the area enclosed by the hysteresis curve remains stable during repeated stretching and releasing.Therefore,most research is limited to the fields of energy dissipation and vibration reduction of the Superelastic SMA wires.Nevertheless,the energy released by the ejection of SMA wire after superelastic elongation is greater than the energy consumed,so it has potential application value in the fields of energy storage and ejection release.Sensor networks play an important role in structural health monitoring and tactile sensing.Existing wired sensor networks require different types of sensors and a large number of wires.Therefore,it is necessary to develop a low-cost and lightweight SMA selfsensing interwoven network for practical applications.Therefore,this paper proposes innovative research on the energy storage and ejection characteristics of superelastic Ni Ti SMA wire and the self-sensing interwoven network of SMA.The energy resistance theoretical model of SMA wire energy storage ejection and the solution model of SMA self-sensing interlaced network are established respectively,and the experimental devices were built based on the research contents of energy storage and ejection experiments and interwoven network loading experiments.The main contents of the paper are as follows:1.The basic characteristics of superelastic SMA wire were studied.A large number of tensile tests were conducted on superelastic Ni Ti SMA wire at room temperature.The effects of cyclic loading times,strain amplitude,and strain rate on stress-strain relationships,resistance-strain relationships,residual strain,and the area enclosed by the hysteresis curve were discussed.2.A test device was designed to study the energy storage and ejection characteristics of superelastic Ni Ti SMA wire and the loading characteristics of the SMA self-sensing interwoven network.This device can be used to test the energy storage and ejection of superelastic SMA wire with different diameters and lengths,while recording displacement,load,resistance,and ejection velocity.It can also be used to conduct positioning loading experiments on the SMA self-sensing interwoven network and record force signals,displacement signals,and multi-channel resistance signals.3.The mechanical behavior of energy storage and ejection of superelastic SMA wire was studied,and the energy storage ejection rules of superelastic SMA wire were clarified.The relationship between stress,strain,and the resistance change rate during energy storage was analyzed in detail.The resistance change rate,energy density of ejection,and energy conversion efficiency were studied in energy storage and ejection experiments.Based on the experimental results,a theoretical model of the relationship between ejection energy density and resistance change rate was established,which can predict and estimate the energy storage and ejection of superelastic SMA wire.4.A self-sensing interwoven network made of superelastic SMA wire was proposed,which can detect the load and deformation of the interwoven network by measuring the resistance of SMA wire without other sensors.The position of the load on the interwoven network can be accurately determined.The theoretical solution model was established based on the overlapped state and the applied force of the network nodes.The feasibility of the SMA self-sensing interwoven network and the accuracy of the theoretical model were verified through experiments.This paper proposes research on the energy storage and ejection of superelastic SMA wire,achieving quantification of energy storage and release based on resistance change.This research has significant advantages and potential in the fields of mechanical energy storage and ejection release for complex tasks requiring programmable and predictable energy storage ejection.In addition,a self-sensing interwoven network made of superelastic SMA wire was proposed,which has important application value in situations where it is inconvenient to directly observe the position of external force and monitor the size of the load.