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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| Online Access: | http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf |
| _version_ | 1796984405275705344 |
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| author | Omar, Mohd Asnawi |
| author_facet | Omar, Mohd Asnawi |
| author_sort | Omar, Mohd Asnawi |
| collection | UPM |
| description | 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. |
| first_indexed | 2024-03-06T11:19:54Z |
| format | Thesis |
| id | upm.eprints-103989 |
| institution | Universiti Putra Malaysia |
| language | English |
| last_indexed | 2024-03-06T11:19:54Z |
| publishDate | 2021 |
| record_format | dspace |
| spelling | upm.eprints-1039892023-07-04T03:03:35Z http://psasir.upm.edu.my/id/eprint/103989/ Stent strength improvement through the utilization of selective laser melting technology Omar, Mohd Asnawi 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. 2021-07 Thesis NonPeerReviewed text en http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf Omar, Mohd Asnawi (2021) Stent strength improvement through the utilization of selective laser melting technology. Doctoral thesis, Universiti Putra Malaysia. Stents (Surgery) Metal catalysts |
| spellingShingle | Stents (Surgery) Metal catalysts Omar, Mohd Asnawi Stent strength improvement through the utilization of selective laser melting technology |
| title | Stent strength improvement through the utilization of selective laser melting technology |
| title_full | Stent strength improvement through the utilization of selective laser melting technology |
| title_fullStr | Stent strength improvement through the utilization of selective laser melting technology |
| title_full_unstemmed | Stent strength improvement through the utilization of selective laser melting technology |
| title_short | Stent strength improvement through the utilization of selective laser melting technology |
| title_sort | stent strength improvement through the utilization of selective laser melting technology |
| topic | Stents (Surgery) Metal catalysts |
| url | http://psasir.upm.edu.my/id/eprint/103989/1/MOHD%20ASNAWI%20BIN%20OMAR%20-%20IR.pdf |
| work_keys_str_mv | AT omarmohdasnawi stentstrengthimprovementthroughtheutilizationofselectivelasermeltingtechnology |