biomaterials-materials-physics-2019-keynote

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May 20-21, 2019 | Vienna, Austria
Biomaterials and Nanomaterials &
Materials Physics and Materials Science
2nd International Conference on
Page 21
Journal of Materials Science and Nanotechnology | Volume 3
Andrea Spaggiari
Eugenio Dragoni
University of Modena and Reggio Emilia, Italy
Nickel-Titanium shape memory alloys: Design and development of
biomedical devices
Nickel-Titanium shape memory alloys (SMAs) are a
smart material with peculiar properties, which are
widely exploited in the biomedical field. These materials
exhibit two very interesting behavior, the shape memory
effect and pseudo-elastic effect, which could be thermally
or mechanically triggered. SMAs could undergo very large
deformation, even more than 10% and yet recovering
the initial shape when the load is removed. They can be
deformed and recover the initial shape upon a thermal
activation, or they are able to provide a constant force for
a given displacement. Their intrinsic hysteretic behavior,
along with a quite low elastic modulus, are two elements
that makes SMA quite interesting in the prosthetic devices.
The excellent corrosion properties, the mechanical
strength, the biological and magnetic resonance
compatibility, explain the large use of SMA devices
in the biomedical field, in particular for mini-invasive
techniques. These extraordinary capabilities are due to the
microstructural properties of the alloys, which present two
stable phases, austenite or martensite, according to the
thermomechanical condition applied. Many biomedical
devices based on the NiTi SMA are nowadays already on
the market in dental, orthopedics, vascular, neurological,
and surgical field. However, the smart exploitation of
these materials could lead to these results even though
these materials presents a high complexity in the design
problem, only thanks to a very close collaboration between
material scientist, clinicians, engineers and designer. This
concurrent engineering approach is needed to overcome
several drawbacks such as the thermomechanical fatigue,
the temperature sensitivity in order to increase the
repeatability of the results. The correct thermomechanical
design could be a first step in the exploitation of this very
interesting class of materials.
Speaker Biography
Andrea Spaggiari is a 36 years old mechatronics engineer. From 2011
he works as assistant professor at the University of Modena and Reggio
Emilia and he is the lecturer of the academic course of “New Materials
for Mechatronics Constructions” and of “Integrated 3D Modelling for
Mechatronic design” in the master in mechatronic engineering. His
current research interests are threefold. First, studying the properties
and the mechanical behavior of structural adhesives and their efficient
modelling. Second, working on smart materials applications, especially
with magneto-rheological fluids and shape memory alloys and his third
research covers the multiscale computational simulations of voids and
defects in polymeric materials. The research activities led to several
industrial projects and to more than 50 papers in international journals.
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