Fabricating NiTi SMA Components

Haberland, Christoph; Elahinia, Mohammad

doi:10.1002/9781118426913.ch6

Cited by 4 publications

(1 citation statement)

References 157 publications

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“…Overall, the tensile results indicate that the casting process causes the emergence of an internal stress field during solidification in the ceramic shell that is relieved after the heat treatment. Haberlan and Elahinia [52] reported that heat treatments after melting and solidification eliminate disadvantages, such as segregation and solidification stresses. Additionally, thermal treatments can partially or entirely recover the compromised atomic mobility and allow the manipulation of properties, such as the modulus of elasticity, transformation temperatures, stiffness, and energy dissipation capacity in NiTi-based SMAs [53].…”

Section: Tensile Behaviour Of the Meshesmentioning

confidence: 99%

NiTi shape memory alloy cellular meshes: manufacturing by investment casting and characterization

Montenegro¹,

Grassi²,

Simões³

et al. 2020

Smart Mater. Struct.

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Recent studies have shown that conventional meshes comprising pure titanium and its alloys can be used to assist the recovery of bone fractures in various parts of the human body, such as the face, jaw, skull and knee. In anticipation of an improved efficiency for these applications and other applications, this work analyses the thermomechanical behaviour of a type of metallic mesh that is fabricated with NiTi shape memory alloys (SMAs), which are smart metals that exhibit functional properties, such as the shape memory effect (SME) and superelasticity (SE). The development of NiTi SMA meshes with different cell designs, good mechanical strength and recoverable deformation to replace titanium meshes and enhance biomedical applications (as well as applications in other fields) can be considered a current technological challenge. In this framework, this study aims to perform the fabrication and mechanical characterization of NiTi SMA meshes produced by investment casting with three different cell geometries (circular, hexagonal and square) in two states (as cast and heat treated). The obtained results show that the manufactured meshes present functional properties even in the as-cast state, as thermoelastic phase transformation and deformation recovery on the order of 6% is demonstrated. The results show that between the heat treatment and mesh cell geometry, the latter factor is the most influential factor in the mechanical behaviour of the meshes. A brief numerical simulation of the tensile behaviour of the meshes is used to deepen the analysis of the influence of cell geometry on their mechanical behaviour. Overall, as-cast meshes with circular and square cells present a high stiffness under tension and bending. The produced meshes show enough thermomechanical features to enhance biomedical applications. These results support the replacement of conventional titanium alloys, which do not possess functional properties, with NiTi SMAs.

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Section: Tensile Behaviour Of the Meshesmentioning

confidence: 99%

NiTi shape memory alloy cellular meshes: manufacturing by investment casting and characterization

Montenegro¹,

Grassi²,

Simões³

et al. 2020

Smart Mater. Struct.

View full text Add to dashboard Cite

show abstract

Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Saedi

Turabi

Andani

et al. 2017

Materials Science and Engineering: A

172

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Compact flexible actuator based on a shape memory alloy for shaping surgical instruments

Fischer

Mathis-Ullrich

2023

At - Automatisierungstechnik

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Conventional flexible actuators for minimally invasive interventions come with complex and bulky actuation infrastructure. We present a proof-of-concept study of a compact flexible actuator with variable shape change featuring shape memory alloy wire loops in active-antagonist configurations for a bending and S-shape. The actuator was fabricated using heat-treated wire loops. The evaluation using optical marker tracking revealed a mean maximum absolute displacement at the distal tip of 19 mm and a force of 90 mN reached in under 15 s. For control, a closed-loop regime was evaluated with steady-state errors below 2°.

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Fabricating NiTi SMA Components

Cited by 4 publications

References 157 publications

NiTi shape memory alloy cellular meshes: manufacturing by investment casting and characterization

NiTi shape memory alloy cellular meshes: manufacturing by investment casting and characterization

Texture, aging, and superelasticity of selective laser melting fabricated Ni-rich NiTi alloys

Compact flexible actuator based on a shape memory alloy for shaping surgical instruments

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