Stent strength improvement through the utilization of selective laser melting technology
The invention of Metal Additive Manufacturing or known as Selective Laser Melting has opened a wide application of field such as biomedical devices, automotive and Oil & Gas, Aerospace and Consolidation of parts, and in certain area where stronger parts can be produced. Furthermore, the Sele...
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| Format: | Thesis |
| Language: | English |
| Published: |
2021
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf |
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| Summary: | The invention of Metal Additive Manufacturing or known as Selective Laser
Melting has opened a wide application of field such as biomedical devices,
automotive and Oil & Gas, Aerospace and Consolidation of parts, and in
certain area where stronger parts can be produced. Furthermore, the
Selective Laser Melting (SLM) has been known to produce new net shape
and intricate design which cannot be achieved through conventional
processing. In this research, the problem statement of laser cuts stent has
been addressed to overcome the constraint of laser cutting by enhancing with
the SLM technology. The additively manufactured stent is consisting of seven
(7) type design where the purpose was manufacturability through SLM
technology by utilizing the strut, diameter, height, and angle. A set of default
parameter with the laser power of 200 Watt, with the hatching distance of
0.14mm, layer thickness of 0.02mm and scanning speed of 800mm/s has
been applied through a series of different type of additive stent. The
tolerances or shrinkage of the stent are also achieving a good result because
the dimensional accuracy reaches closely to 0.5% shrinkage (±70 μm) of
diameter and 0.03% (±30 μm) for the height. Result from testing method also
shown that, where all seven (7) AM stents showed better performance
compared with conventional stent due to the placement of strut hoops in all
connectors with highest stiffness was 1.44 N/mm (in axial) and 0.75 N/mm in
radial during compression load. Whereas the flexural test showed a better
stiffness in the value of 0.44N/mm. The heat treatment stent was then
compared with the As-built stent where there is significant increase on
compression test (2.04 N/mm). While the Flexural Test showed the decrease
of stiffness (0.36 N/mm), but still the acceptance rate was better compared to
the commercial stent in the market. The Clinical test (Cytotoxicity test) also
showed promising result where all the additively manufactured stent showed
100.3% viability cells. |
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