title: Study on loss mechanism of SMA tracheal stent subjected to cough excitation.
abstract: A kind of Ti-Ni shape memory alloy (SMA) hysteretic nonlinear model is developed, and the loss mechanism of a SMA tracheal stent subjected to cough excitation is studied in this paper. Nonlinear differential items are introduced to express the hysteretic phenomena of Ti-Ni SMA, and the fitting effect of the SMA constitutive model on the experimental data is proved by the partial least-square regression method. The nonlinear dynamic model of a Ti-Ni SMA tracheal stent subjected to cough excitation is developed, and the system's dynamic response is obtained. The numerical results show that the system's vibration is little in weak excitation, becomes large with the increase of the stochastic excitation, and finally becomes little again with the further increase of the stochastic excitation; the stochastic resonance phenomenon occurs in the process, which may cause stent fracture or loss.
authors.affiliation: Deparment of Mechanics, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China.
authors.forename: Zhiwen
authors.initials: Z
authors.lastname: Zhu
authors.affiliation: Deparment of Mechanics, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China.
authors.forename: Xinmiao
authors.initials: X
authors.lastname: Li
authors.affiliation: Deparment of Mechanics, Tianjin University, 92 Weijin Road, Nankai District, Tianjin 300072, China.|Tianjin Key Laboratory of Nonlinear Dynamics and Chaos Control, 92 Weijin Road, Nankai District, Tianjin 300072, China.
authors.forename: Jia
authors.initials: J
authors.lastname: Xu
mesh_terms: D000161:Acoustic Stimulation / Q000379:methods*; D003198:Computer Simulation; D017076:Computer-Aided Design; D003371:Cough / Q000503:physiopathology*; D055119:Elastic Modulus; D019544:Equipment Failure Analysis; D006801:Humans; D008954:Models, Biological; D011474:Prosthesis Design; D017755:Prosthesis Fitting / Q000379:methods; D015607:Stents; D013314:Stress, Mechanical; D014135:Tracheal Stenosis / Q000503:physiopathology* / Q000628:therapy*
keywords: Shape memory alloy (SMA); cough; stochastic resonance; tracheal stent