Influence of stress concentration on the recovery stress generation

Braïlovski, Vladimir; Clément, Eric; Terriault, Patrick; Trochu, F.

doi:10.1051/jp4:2003872

Cited by 5 publications

(3 citation statements)

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“…Significant changes in the elastic properties of solids are known mainly for certain solid-solid phase transformations, such as the γ ↔ α phase transformation in NiTi shape memory alloys. In this case, the high temperature (body centred cubic, bcc) γ phase has an E-modulus of approximately 80 GPa, compared to 30 GPa for the low temperature (face centred cubic, fcc) α phase [3]. The noticeable change in elastic properties in this case is not due to changes in the interaction potentials at an atomic level but rather to the activation of twinning/detwinning mechanisms in the bcc phase that are not available in the fcc phase.…”

Section: Introductionmentioning

confidence: 98%

A sandwich beam with electrostatically tunable bending stiffness

Bergamini¹,

Christen

Maag

et al. 2006

Smart Mater. Struct.

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The tuning of the bending stiffness of structural elements is of interest for, among other things, the suppression of vibrations related to resonance phenomena. For a given cross-sectional area and geometry, the variation of the elastic properties of the material composing the structure provides a viable approach to this task. Only very limited options are available for such changes in material properties. The use of NiTi shape memory alloys has been proposed for this purpose. A new, energetically less expensive method for the modification of the bending stiffness of sandwich beams is presented. The proposed method makes use of electrostatic forces to modify the transfer of shear stresses at the interface between the faces and the core of the sandwich. Changes in bending stiffness of up to 18 times could be obtained for a prototype beam. A simple model for describing the behavior of the beam is presented.

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Section: Introductionmentioning

confidence: 98%

A sandwich beam with electrostatically tunable bending stiffness

Bergamini¹,

Christen

Maag

et al. 2006

Smart Mater. Struct.

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show abstract

“…This property makes SMA ideally suited for use as fasteners, seals, connectors and clamps [1]. The generation and evolution of recovery stresses strongly depends on thermomechanical treatments [2], annealing [3,4], pre-strain [5][6][7], thermocycling [8][9][10][11], matrix [12][13][14][15], etc. Meanwhile, the constrained phase transformations of SMAs associated with recovery stress have been investigated [16][17][18][19].…”

Section: Introductionmentioning

confidence: 99%

Influence of pre-strain on recovery stress of annealed NiTi thin wire during isothermal holding

Yan

Humbeeck

2011

Journal of Alloys and Compounds

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“…investigated the generation of recovery stresses in a NiTiCu wire with complex pre‐strained conditions . The influence of pre‐strain of SMA wires, thermal cycling, thermal expansion and stiffness of matrix materials on the course of the generated recovery stresses have been investigated in . K. A. Tsoi et al .…”

Section: Introductionmentioning

confidence: 99%

Temperature and Time Dependence on Recovery Stress Relaxation in Nickel Titanium Wire during Isothermal Holding at High Temperatures

Yan

Humbeeck

2013

Strain

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In this study, the influence of kinematically constrained thermal cycling (heating, isothermal holding and cooling) on the recovery stress in annealed nickel titanium wire was investigated. A 4% pre-strained nickel titanium wire was heated to temperatures (150, 200, 250 and 300°C) much higher than the austenite finish temperature. It was observed that the maximum recovery stress obtained at different conditions decreases significantly after the first thermal cycle and reduces gradually with further increasing the number of thermal cycles. It was also seen that the recovery stress increases with time during isothermal holding at 150°C. During isothermal holding at other temperatures, the recovery stress shows an exponential decrease, and the decrease rate of the recovery stress depends on the isothermal holding temperature. The higher isothermal holding temperature is the more the recovery stress decreases. The decrease rate reduces with increasing the number of thermal cycles.

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Influence of stress concentration on the recovery stress generation

Cited by 5 publications

References 0 publications

A sandwich beam with electrostatically tunable bending stiffness

A sandwich beam with electrostatically tunable bending stiffness

Influence of pre-strain on recovery stress of annealed NiTi thin wire during isothermal holding

Temperature and Time Dependence on Recovery Stress Relaxation in Nickel Titanium Wire during Isothermal Holding at High Temperatures

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