Impact and semi-static performance of reinforced thermoplastic composites
Composites, renowned for their high specific strength and stiffness, find extensive use in aerospace applications, with Thermoset (TS) Composites commonly preferred. However, the resurgence of interest in Thermoplastic (TP) Composites, owing to improved impact resistance and recyclability, has led t...
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| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2024
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| Online Access: | https://hdl.handle.net/10356/177002 |
| _version_ | 1811691280788357120 |
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| author | Akash S/O Singaram |
| author2 | Sunil Chandrakant Joshi |
| author_facet | Sunil Chandrakant Joshi Akash S/O Singaram |
| author_sort | Akash S/O Singaram |
| collection | NTU |
| description | Composites, renowned for their high specific strength and stiffness, find extensive use in aerospace applications, with Thermoset (TS) Composites commonly preferred. However, the resurgence of interest in Thermoplastic (TP) Composites, owing to improved impact resistance and recyclability, has led to the exploration of fillers to enhance their performance. Notably, studies on CF/PA6 TP composites with core-shell rubber (CSR) fillers remain limited. This report investigated the behaviour and damage experiences of TP woven composites, with CSR fillers (pristine, 2 wt%, and 4 wt%) dispersed at the ply interfaces, under impact (load, displacement and energy characteristics), bending, and compressive loads, contributing insights for future TP composite structures. The report focused on fabricating TP composite samples, conducting semi-static impact tests, and analyzing load and failure mechanisms quantitatively.
Semi-static tests, following ASTM standards, reveal the optimal configuration at 4 wt% CSR filler, demonstrating superior flexural, compression, and interlaminar shear strength along with minimal damage during fracture. Contrarily, low-velocity impact tests at varying energy levels exhibit lower stiffness at lower energies (20, 30, 40J) due to thermoplastic ductility, with the 2 wt% configuration outperforming in load-bearing, stiffness, elastic deformation recovery, and energy absorption at higher energies (50, 60, 70J). The difference in optimal configurations between semi-static and impact performance stems from varying failure mechanisms. Semi-static failures, mainly delamination, are less affected by stress concentrations introduced by the 4 wt% configuration, favoring its use. Conversely, impact-based failures, primarily induced by indentation, benefit from lower stress concentration, making the 2 wt% configuration more optimal. The findings emphasise the importance of tailoring CSR filler content for specific applications and evaluating the TP composite's suitability and cost-effectiveness, particularly in aerospace. Further studies should optimise CSR filler content, considering the unique requirements of semi-static and impact scenarios. This research contributes valuable insights for designing and maintaining future TP composite structures. |
| first_indexed | 2024-10-01T06:17:23Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/177002 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T06:17:23Z |
| publishDate | 2024 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1770022024-06-01T16:50:10Z Impact and semi-static performance of reinforced thermoplastic composites Akash S/O Singaram Sunil Chandrakant Joshi School of Mechanical and Aerospace Engineering MSCJoshi@ntu.edu.sg Engineering Physics Thermoplastic (TP) composites Core-shell rubber (CSR) fillers Impact Semi-static Composites, renowned for their high specific strength and stiffness, find extensive use in aerospace applications, with Thermoset (TS) Composites commonly preferred. However, the resurgence of interest in Thermoplastic (TP) Composites, owing to improved impact resistance and recyclability, has led to the exploration of fillers to enhance their performance. Notably, studies on CF/PA6 TP composites with core-shell rubber (CSR) fillers remain limited. This report investigated the behaviour and damage experiences of TP woven composites, with CSR fillers (pristine, 2 wt%, and 4 wt%) dispersed at the ply interfaces, under impact (load, displacement and energy characteristics), bending, and compressive loads, contributing insights for future TP composite structures. The report focused on fabricating TP composite samples, conducting semi-static impact tests, and analyzing load and failure mechanisms quantitatively. Semi-static tests, following ASTM standards, reveal the optimal configuration at 4 wt% CSR filler, demonstrating superior flexural, compression, and interlaminar shear strength along with minimal damage during fracture. Contrarily, low-velocity impact tests at varying energy levels exhibit lower stiffness at lower energies (20, 30, 40J) due to thermoplastic ductility, with the 2 wt% configuration outperforming in load-bearing, stiffness, elastic deformation recovery, and energy absorption at higher energies (50, 60, 70J). The difference in optimal configurations between semi-static and impact performance stems from varying failure mechanisms. Semi-static failures, mainly delamination, are less affected by stress concentrations introduced by the 4 wt% configuration, favoring its use. Conversely, impact-based failures, primarily induced by indentation, benefit from lower stress concentration, making the 2 wt% configuration more optimal. The findings emphasise the importance of tailoring CSR filler content for specific applications and evaluating the TP composite's suitability and cost-effectiveness, particularly in aerospace. Further studies should optimise CSR filler content, considering the unique requirements of semi-static and impact scenarios. This research contributes valuable insights for designing and maintaining future TP composite structures. Bachelor's degree 2024-05-27T01:09:55Z 2024-05-27T01:09:55Z 2024 Final Year Project (FYP) Akash S/O Singaram (2024). Impact and semi-static performance of reinforced thermoplastic composites. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177002 https://hdl.handle.net/10356/177002 en B237 application/pdf Nanyang Technological University |
| spellingShingle | Engineering Physics Thermoplastic (TP) composites Core-shell rubber (CSR) fillers Impact Semi-static Akash S/O Singaram Impact and semi-static performance of reinforced thermoplastic composites |
| title | Impact and semi-static performance of reinforced thermoplastic composites |
| title_full | Impact and semi-static performance of reinforced thermoplastic composites |
| title_fullStr | Impact and semi-static performance of reinforced thermoplastic composites |
| title_full_unstemmed | Impact and semi-static performance of reinforced thermoplastic composites |
| title_short | Impact and semi-static performance of reinforced thermoplastic composites |
| title_sort | impact and semi static performance of reinforced thermoplastic composites |
| topic | Engineering Physics Thermoplastic (TP) composites Core-shell rubber (CSR) fillers Impact Semi-static |
| url | https://hdl.handle.net/10356/177002 |
| work_keys_str_mv | AT akashsosingaram impactandsemistaticperformanceofreinforcedthermoplasticcomposites |