Stress generation by shape memory alloy wires embedded in polymer composites

Bollas, D.; Pappas, Panagiotis; Parthenios, John; Galiotis, Costas

doi:10.1016/j.actamat.2007.06.006

Cited by 42 publications

(28 citation statements)

References 24 publications

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“…Similarly, some applications of martensites make use of a SMA element which is embedded in a matrix of a non-transforming material such as a polymer. 12 Since these nanosystems are embedded in a matrix, there will be geometrical constraints on the phase transformation and microstructures: the martensite variants should arrange so that there is no macroscopic shape change. Geometry will also affect mechanical behavior.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires

Bouville¹,

Ahluwalia²

2008

Acta Materialia

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We use the phase-field method to study the martensitic transformation at the nanoscale. For nanosystems such as nanowires and nanograins embedded in a stiff matrix, the geometric constraints and boundary conditions have an impact on martensite formation, leading to new microstructuressuch as dots aligned on a square lattice with axes along 01 -or preventing martensite formation altogether. We also perform tension tests on the nanowires. The stress-strain curves are very different from bulk results. Moreover, they are weakly affected by microstructures -the mechanical response of nanowires with different microstructures may be similar, while nanowires with the same microstructure may have a different mechanical behavior. We also observe that at the transition temperature, or slightly below it, the narrowest wires behave pseudoelastically whereas wider wires are in the memory-shape regime. Moreover the yield stress does not change monotonically with width: it has a minimum value at intermediate width.

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Section: Introductionmentioning

confidence: 99%

Microstructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires

Bouville¹,

Ahluwalia²

2008

Acta Materialia

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“…The present SMP has generated a maximum stress of 24 MPa at 50% fixed strain. Such high magnitude of stress generated from a SMP is promising and even comparable with that generated from the shape memory alloys [23].…”

Section: Constraint Shape Recoveriesmentioning

confidence: 95%

Characterization of unconstraint and constraint shape recoveries of an epoxy based shape memory polymer

et al. 2015

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“…The composite can act with an active or passive way depending on the application. For active applications, it has been shown that SMA wires can act as internal stress generators in polymer composite systems (Bollas et al, 2007), which induce the SMA activation. Some SMA composites models are developed for structure morphing (Brinson et al, 1997;Oh et al, 2001;Armstrong and Lorentzen, 2001;Chemisky et al, 2009a), or for vibration control (Brinson and Lammering, 1993;Aoki and Shimamoto, 2003;Zhang et al, 2007).…”

Section: Introductionmentioning

confidence: 99%

Modeling of niobium precipitates effect on the Ni47Ti44Nb9 Shape Memory Alloy behavior

Piotrowski

Zineb

Patoor

et al. 2012

International Journal of Plasticity

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a b s t r a c tCommercial Ni 47 Ti 44 Nb 9 Shape Memory Alloy (SMA) is generally adopted for tightening applications thanks to its wide transformation hysteresis, compared with classical NiTi. Its sensibility to thermo-mechanical treatments allows it to be either martensitic or austenitic in a wide range of temperature, between À60°C and 80°C. A modeling of niobium precipitates effects on Ni 47 Ti 44 Nb 9 SMA behavior is proposed. For this object, a two phase thermo-mechanical model is developed. It describes the global effective behavior of an elastoplastic inclusion (niobium precipitates) embedded within an SMA matrix. The constitutive law developed by Peultier et al. (2006) and improved by Chemisky et al.is adopted to model the matrix shape memory behavior. The elastoplastic constitutive law for inclusion is the one proposed by Wilkins with Simo and Hughes's radial return algorithm. The Mori-Tanaka scale transition scheme is considered for the determination of the effective constitutive equations. Obtained results highlight the effect of niobium precipitates on the thermomechanical behavior of Ni 47 Ti 44 Nb 9 , and particularly on the corresponding hysteresis size. It appears that the niobium plasticity increases this hysteresis size. The developed constitutive law has been implemented in the ABAQUS Ò Finite Element code and considered for the numerical prediction of the tightening pressure in a connection application.

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Stress generation by shape memory alloy wires embedded in polymer composites

Cited by 42 publications

References 24 publications

Microstructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires

Microstructure and mechanical properties of constrained shape-memory alloy nanograins and nanowires

Characterization of unconstraint and constraint shape recoveries of an epoxy based shape memory polymer

Modeling of niobium precipitates effect on the Ni47Ti44Nb9 Shape Memory Alloy behavior

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