SMA Constitutive Modeling and Analysis of Plates and Composite Laminates

Sacco, Elio; Artioli, Edoardo

doi:10.1016/b978-0-08-099920-3.00006-1

Cited by 2 publications

(1 citation statement)

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“…This test shows that it consists of Ti and Ni elements at the largest area. The atomic weights (at.%) of Ti and Ni elements are very close to the nominal compositions of Nitinol in spite of minor variations by different manufacturers [9]. Results of atomic and weigh percentages are shown in table III.…”

Section: Methodssupporting

confidence: 54%

Thermomechanical response of a viscoelastic Ni-Ti – Shape Memory Alloy composite beam

Campo-Ceballos¹,

Lima²,

Levy-Neto³

2019

ITECKNE

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This investigation is concerned with the mechanical behavior of Shape Memory Alloy Hybrid Composite Beams (SMAHC), that consist of a circular bar of NiTi alloy incorporated in a 500 mm long cylindrical pipe of polypropylene (PP), with external diameter 50 mm and nominal wall thickness 7 mm, wound with a nylon/epoxy layer. The Ni-Ti alloy was characterized using: scanning electron microscopy (SEM); X-ray diffraction (XRD) and Differential thermal analysis (DSC). The nominal chemical composition of the alloy is 50.05 %Ni / 49.95%Ti, and the softer martensite is the predominant phase at room temperature. The approximate martensite (M) to Austenitic (A) phase transformation temperatures were Mstart = 32°C, Mfinal = 46°C, Astart = 38 °C and Afinal = 60°C. For temperature T<Mfinal, Ni-Ti bar presents 100% martensitic phase, whereas for T>Afinal it is fully converted in the Austenitic phase; and its elasticity modulus increases by a factor up to three times. This significant change in stiffness of Ni-Ti, without changing its mass, has motivated the application of such alloy in machine vibration control. The SMAHC beams were subjected to static three-point bending tests, in the elastic regime. Experimental results showed that, in average, at 21°C, the PP pipes effective flexural elastic modulus increased 112%, from 757 MPa to 1609 MPa, when the Ni-Ti bar and the external layer of nylon/epoxy were incorporated to the PP pipe, creating a smart beam. These last results indicate that the SMAHC beam can work as an adaptative structure.

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Section: Methodssupporting

confidence: 54%