&lt;title&gt;Dynamic properties of pseudoelastic shape memory alloys&lt;/title&gt;

Li, D. Z.; Feng, Z. C.

doi:10.1117/12.275696

Cited by 9 publications

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“…Whereas some work has been carried out on tension tests, only a few papers are concerned with damping behaviour of SMA components. Li and Feng [11] studied a NiTi bar under tension-compression and under bending. At resonant frequencies up to 1100 Hz they detected a decrease in the transmissibility and resonant frequency with increasing excitation amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Experimental investigations on the damping capacity of NiTi components

Lammering

Schmidt

2001

Smart Mater. Struct.

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In the study presented, the damping capacity of shape memory alloys in the austenitic range was considered. The investigations on the dynamic behaviour of pseudoelastic shape memory alloys start with tensile tests on NiTi specimens at frequencies of up to 4 Hz. These experiments show that the beginning of the transformation process is more difficult to observe and that the critical stress value for the transition to martensite becomes obviously smaller at higher strain rates. Furthermore, the area of the hysteresis loop is reduced with increasing strain rate. The damping behaviours of NiTi and steel are directly compared in experiments on a pre-strained string. The system is excited by hammer impact as well as by an electrodynamic shaker. It is pointed out that the damping capacity is highly dependent on the vibration amplitude. Further experiments are performed with coil springs made from NiTi and steel. A stiff beam on which additional masses are mounted is supported by two coil springs so that the whole assembly can be considered as a spring-mass system. The results which were obtained in the string experiments are verified by these investigations.

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Section: Introductionmentioning

confidence: 99%

Experimental investigations on the damping capacity of NiTi components

Lammering

Schmidt

2001

Smart Mater. Struct.

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“…In sharp contrast, much less has been achieved on the experimental aspect. Some early experimental works (Collet et al, 2001;Feng and Li, 1996;Graesser, 1995;Lammering and Schmidt, 2001;Li and Feng, 1997;Schmidt and Lammering, 2004a, b) have observed the softening nonlinear features of the transmissibility curve. The resonance frequencies and peak responses strongly depend on the external excitations.…”

Section: Introductionmentioning

confidence: 98%

Thermomechanical responses of nonlinear torsional vibration with NiTi shape memory alloy – Alternative stable states and their jumps

Xia

Qin

2017

Journal of the Mechanics and Physics of Solids

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The dynamic response of nonlinear torsional vibration with phase transformable NiTi Shape Memory Alloy (SMA) wire is investigated by experiment in this paper. The thermomechanical responses of NiTi wire as a softening nonlinear damping spring in the torsional vibration system are measured by synchronized acquisition of the rotational angle and temperature under external excitation. Frequency Response Curves (FRCs) at fixed excitation amplitude and Amplitude Response Curves (ARCs) at fixed frequency are obtained in the frequency and amplitude domains respectively. It is found that, as the deformation of NiTi wire goes into the softening nonlinear phase transition region, the smooth and stable dynamic responses along one branch of FRC or ARC will gradually enter into metastable region and eventually become unstable and drastically switch to a new contrasting alternative stable state along the other branch. The jump phenomenon between the alternative stable states on the lower and upper branches of the FRC or ARC and the hysteresis between the jump-up and jump-down are identified in experiments. In addition, the effects of internal and external disturbance (both magnitude and direction) on triggering the jumps between the alternative stable states along the two metastable branches are examined in the time domain. The stability of the nonlinear dynamic response is analyzed by the Duffing oscillator model and interpreted via the stability landscape. For the first time, we directly reveal the alternative stable states and jump phenomena of thermomechanical responses by experiments in the frequency, amplitude and time domains. The results not only showed the important roles of phase transition nonlinearity in bringing multiple equilibrium states and their fast switches, but also provided a solid experimental base for the identification of metastable regions as well as further management of the undesired dynamic responses of vibration system where NiTi is used as a nonlinear damping spring.

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“…Feng and Li (1996) and Li and Feng (1997) first measured transmissibility curves of SMA rod under traction-compression and bending. The resonance frequencies, peak responses and damping ratios were found to depend excitation amplitudes.…”

Section: Introductionmentioning

confidence: 99%

Jump phenomena of rotational angle and temperature of NiTi wire in nonlinear torsional vibration

Xia

Sun

2015

International Journal of Solids and Structures

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a b s t r a c tThis paper performs experimental and analytical investigations on jump phenomena of thermomechanical responses of a nonlinear torsional vibration system with a phase transformable NiTi Shape Memory Alloy (SMA) wire as a nonlinear spring. By synchronizing the measurement of rotational angle and temperature of the NiTi wire in the torsional vibration system under external sinusoidal excitation, their evolutions in the transient and steady states are acquired. By monotonically increasing/decreasing the excitation frequency with small intervals around the primary resonance frequency, Frequency Response Curves (FRCs) of these two physical quantities are obtained and their jumps on the FRCs are captured in the frequency domain. To understand and quantify such jump phenomena, an effective Duffing oscillation model is introduced to simulate the mechanical behaviour of NiTi SMA in the dynamic system and to determine the FRCs and the characteristic jump frequencies. A lumped heat transfer analysis is then performed to establish the relationship between the temperature oscillation and the rotational angle. It is shown that the jump of the rotational angle is accompanied by a simultaneous jump of the temperature oscillation of the NiTi wire in torsional vibration. Particularly, the coupling effect between the thermal response and mechanical response can be significant and must be considered in the study of a nonlinear dynamic system with NiTi SMA component.

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<title>Dynamic properties of pseudoelastic shape memory alloys</title>

Cited by 9 publications

References 0 publications

Experimental investigations on the damping capacity of NiTi components

Experimental investigations on the damping capacity of NiTi components

Thermomechanical responses of nonlinear torsional vibration with NiTi shape memory alloy – Alternative stable states and their jumps

Jump phenomena of rotational angle and temperature of NiTi wire in nonlinear torsional vibration

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