This paper presents a dynamic analysis of the free and forced vibration of a free-standing bridge of superelastic shape memory alloy TiNiCuCo film with ultra-low fatigue properties and evaluates its versatility for no...This paper presents a dynamic analysis of the free and forced vibration of a free-standing bridge of superelastic shape memory alloy TiNiCuCo film with ultra-low fatigue properties and evaluates its versatility for novel miniature scale damping applications.A thermodynamics-based finite element model is used to simulate the evolution of martensite phase fraction during load-induced martensitic phase transformation.The effects of pre-strain,strain rate and excitation load on the hysteresis of stress-strain characteristics are investigated in order to assess damping energies.The analysis is performed under non-isothermal conditions taking into account heat transfer and rate-dependence of release and absorption of latent heat.We show that damping energy can be maximized by applying an optimum pre-strain.A maximum damping capacity of 0.17 is determined for the case of complete stressstrain hysteresis loop during phase transformation.展开更多
基金This work was supported by the German Science Foundation DFG[WE 4747/–]。
文摘This paper presents a dynamic analysis of the free and forced vibration of a free-standing bridge of superelastic shape memory alloy TiNiCuCo film with ultra-low fatigue properties and evaluates its versatility for novel miniature scale damping applications.A thermodynamics-based finite element model is used to simulate the evolution of martensite phase fraction during load-induced martensitic phase transformation.The effects of pre-strain,strain rate and excitation load on the hysteresis of stress-strain characteristics are investigated in order to assess damping energies.The analysis is performed under non-isothermal conditions taking into account heat transfer and rate-dependence of release and absorption of latent heat.We show that damping energy can be maximized by applying an optimum pre-strain.A maximum damping capacity of 0.17 is determined for the case of complete stressstrain hysteresis loop during phase transformation.
