MECHANICAL BEHAVIOR OF Ni-Ti SMA HELICAL SPRINGS MANUFACTURED BY INVESTMENT CASTING

This work aimed to produce mechanical components of nickel–titanium shape memory alloys using investment casting processes. Then, in order to validate processing, different designs of nickel–titanium shape memory alloy components as staple implants, Belleville springs, meshes, helical springs, screws and hexagonal honeycombs were produced and submitted to thermal and mechanical characterization. Thermoelastic martensitic transformation of the nickel–titanium shape memory alloy parts was determined by differential scanning calorimetry and electrical resistance with temperature, while the superelastic behaviour was verified by cyclic tensile and compression tests. It has been demonstrated that the employed investment casting processes are suitable to manufacture nickel–titanium shape memory alloy mechanical components with simple and complicated designs as well as functional properties related to phase transformation and superelasticity.

Download Full-text

Nonlinear geometric influence on the mechanical behavior of shape memory alloy helical springs

Smart Materials and Structures ◽

10.1088/0964-1726/24/3/035012 ◽

2015 ◽

Vol 24 (3) ◽

pp. 035012 ◽

Cited By ~ 22

Author(s):

Marcelo A Savi ◽

Pedro Manuel C L Pacheco ◽

Mauricio S Garcia ◽

Ricardo A A Aguiar ◽

Luís Felipe G de Souza ◽

...

Keyword(s):

Shape Memory Alloy ◽

Mechanical Behavior ◽

Shape Memory ◽

Helical Springs ◽

Nonlinear Geometric

Download Full-text

Mechanical behavior of a NiTi superelastic bone plate obtained by investment casting assisted by additive manufacturing

Smart Materials and Structures ◽

10.1088/1361-665x/abca83 ◽

2020 ◽

Vol 30 (2) ◽

pp. 025009

Author(s):

Antonio Aristófanes Da Cruz Gomes ◽

Estephanie Nobre Dantas Grassi ◽

Paulo César Sales da Silva ◽

Carlos José de Araújo

Keyword(s):

Additive Manufacturing ◽

Mechanical Behavior ◽

Investment Casting ◽

Bone Plate

Download Full-text

Analysis of the Geometric Nonlinear Effect on the Mechanical Behavior of Pseudoelastic Shape Memory Alloy Helical Springs

10.20906/cps/cob-2015-0480 ◽

2015 ◽

Author(s):

Marcelo Amorim Savi ◽

Mauricio S. Garcia ◽

Pedro Manuel Calas Lopes Pacheco ◽

Ricardo Alexandre Amar de Aguiar ◽

Luís Felipe Guimarães de Souza ◽

...

Keyword(s):

Shape Memory Alloy ◽

Mechanical Behavior ◽

Shape Memory ◽

Nonlinear Effect ◽

Helical Springs ◽

Geometric Nonlinear

Download Full-text

Application of TEM to Deformation, Wear, and Fracture of Ceramics

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100052377 ◽

1974 ◽

Vol 32 ◽

pp. 472-473

Author(s):

B. J. Hockey

Keyword(s):

Wear Resistance ◽

High Temperature ◽

Mechanical Behavior ◽

Brittle Materials ◽

High Temperature Strength ◽

Wide Range ◽

Corrosive Environments ◽

Further Development

Ceramics, such as Al2O3 and SiC have numerous current and potential uses in applications where high temperature strength, hardness, and wear resistance are required often in corrosive environments. These materials are, however, highly anisotropic and brittle, so that their mechanical behavior is often unpredictable. The further development of these materials will require a better understanding of the basic mechanisms controlling deformation, wear, and fracture.The purpose of this talk is to describe applications of TEM to the study of the deformation, wear, and fracture of Al2O3. Similar studies are currently being conducted on SiC and the techniques involved should be applicable to a wide range of hard, brittle materials.

Download Full-text