Crescimento de trincas em ligas de memória de forma sob vida em fadiga
Resumen
Shape memory alloys are a class of metallic alloys that arouse interest in both the
academic and industrial spheres due to their properties of shape memory effect and
superelasticity that arise from the reversible transformation of martensite.
This type of alloy was discovered in the early 1930s when reversible martensitic
transformations and pseudoelastic behavior were first observed. As studies in LMF
advanced and more practical applications were developed a commercial opportunity
was created for this class of metal alloys and in 1960, in a laboratory in the United
States a NiTi alloy was developed under the trade name NiTiNOL, in reference to the
laboratory where it was developed, Naval Ordnance Laboratory.
Over time, LMFs have gained ground in different commercial applications in the
automotive, aerospace and robotics industries. They have also been introduced in the
field of medicine and dentistry for their good biocompatibility and biofunctional
properties.
Like conventional metal alloy components, LMFs are also subject to fatigue fractures.
This work aims to relate some concepts of fracture mechanics with the study of how
the crack propagation rate is affected by some factors such as the temperature at
which the alloy is subjected as well as its characteristic temperatures for phase
transition, grain size, anisotropy and texture.
The understanding of how the propagation rate is influenced by these factors is of
paramount importance so that it is possible to improve designs and components by
increasing fatigue life, efficiency and the possibility of designing new applications
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