&lt;title&gt;Damping in SMA-reinforced composites using SMA intrinsic properties&lt;/title&gt;

Boller, Christian; Konstanzer, Peter; Matsuzaki, Yuji; Ikeda, Tadashige

doi:10.1117/12.429689

Cited by 7 publications

(4 citation statements)

References 3 publications

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“…To examine the effectiveness of utilization of SMAs in passive damping enhancement, researchers of DaimlerChrysler in Munich and Nagoya University performed a preliminary joint test of damped oscillations of beams with SMA films bonded onto or SMA wires embedded into the beam [1].…”

Section: Passive Damping Enhancement Using Smasmentioning

confidence: 99%

HIV-1 integrase inhibitors as new components of antiviral therapy

Prikazchikova¹,

Sycheva²,

Agapkina³

et al. 2008

Russ. Chem. Rev.

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We present a brief summary of new technical developments of passive and active vibration controls which we have performed for the last several years partly as an international collaborative R&D project on Smart Materials and Structural Systems sponsored by the Japanese Ministry of Economy, Trade and Industry. In connection with the passive damping control, shape memory alloys (SMAs) were used as damping elements. To examine the effect of damping enhancement, beams with SMA films bonded onto them or SMA wires embedded into them were made, and free damped oscillations were measured. The damping coefficient increased by more than 100% compared with the beams without SMAs. Thermodynamic behaviors of an SMA wire and film were also investigated experimentally and numerically. In active vibration control, a new concept of smart material systems was proposed. That is a partially magnetized alloy, which is stiff and strong enough as a structural element and responds sufficiently quickly as an actuator due to an electromagnetic force. A simplified experiment and numerical simulation were performed and the results showed the feasibility of the proposed smart material system using the electromagnetic force.

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Section: Passive Damping Enhancement Using Smasmentioning

confidence: 99%

HIV-1 integrase inhibitors as new components of antiviral therapy

Prikazchikova¹,

Sycheva²,

Agapkina³

et al. 2008

Russ. Chem. Rev.

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show abstract

“…Moreover, since their stress-strain relationships show a large hysteresis loop with the energy corresponding to its area being dissipated, they are expected to be used not only as actuators but also as damping materials or shock absorbers (e.g. Thomson et al 1995, Adachi and Unjoh 1999, Gandhi and Chapuis 2001, Boller et al 2001.…”

Section: Introductionmentioning

confidence: 99%

Constitutive model of shape memory alloys for unidirectional loading considering inner hysteresis loops

Ikeda¹,

Nae²,

Naito³

et al. 2004

Smart Mater. Struct.

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A specimen-based macroscopic constitutive model of shape memory alloys for unidirectional loading, which is simple yet accurate and has a physical background, was derived from a grain-based microscopic model. To consider the inner hysteresis loops of a stress–strain–temperature relationship, a new inner loop model called the shift and skip model was proposed. This model is based on microscopic aspects and includes the memory effect of deformation history. Stress–strain relationships were simulated for some representative strain cycles. Numerical results showed that the proposed simple model could capture corresponding experimental results accurately enough to be applied for smart structural design. Comparison with major specimen-based macroscopic models was also discussed, under a unifying approach based on the driving energy and required transformation energy pair.

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“…The damping performance of a pseudoelastic SMA is relatively high because the area of its stress-strain hysteresis loop, which represents the dissipated energy, is large compared to usual metallic alloys, and for this reason the material is used in structural systems for damping enhancement [1]. However, since the SMA stress-strain relationship changes depending on the applied strain rate, strain amplitude, and temperature [2][3][4][5][6], in some conditions of the system we cannot obtain a large hysteresis loop and, accordingly, a good damping performance.…”

Section: Introductionmentioning

confidence: 99%

“…In the following, we briefly review the research on SMAs for active or passive control. Matsuzaki et al [7], Boller et al [8], and Thomson et al [9] investigated SMAs from the viewpoint of increasing the passive damping of structures. In particular, Boller [8] and Thomson [9] have analyzed the damping increase due to the use of prestressed SMA wires in a structure close to the one analyzed in the present paper, and their results demonstrate that pseudoelasticity can be used to augment passive damping significantly in structural systems.…”

Section: Introductionmentioning

confidence: 99%

The active tuning of a shape memory alloy pseudoelastic property

Nae

Ikeda

Matsuzaki

2004

Smart Mater. Struct.

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To improve the damping performance of a shape memory alloy (SMA), we propose a concept of active tuning of its pseudoelastic property where the shape of the stress–strain curve is modified as desired by utilizing the material’s strong thermo-mechanical coupling characteristic. Simulated results are presented for a structural system in which SMA wires are used to suppress the vibration of a cantilevered beam by controlling the wire temperature using an electric current. This control increases the area of inherent hysteresis loop associated with the pseudoelastic effect and a large damping is obtained. In the system discussed, airflow is applied for cooling. It is shown that under forced heat convection the wire temperature can be changed fast enough to control a structure vibrating at more than 5 Hz. Simulated results seem to promise that the active tuning of SMA characteristics can increase its already high inherent damping by a factor of more than two. Experiments are also performed to validate the SMA model used in the numerical simulations.

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<title>Damping in SMA-reinforced composites using SMA intrinsic properties</title>

Cited by 7 publications

References 3 publications

HIV-1 integrase inhibitors as new components of antiviral therapy

HIV-1 integrase inhibitors as new components of antiviral therapy

Constitutive model of shape memory alloys for unidirectional loading considering inner hysteresis loops

The active tuning of a shape memory alloy pseudoelastic property

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