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https://hdl.handle.net/10356/177504| Title: | Impact response of repaired hybrid sandwich structures | Authors: | Low, Zheng Bin | Keywords: | Engineering | Issue Date: | 2024 | Publisher: | Nanyang Technological University | Source: | Low, Z. B. (2024). Impact response of repaired hybrid sandwich structures. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177504 | Project: | C079 | Abstract: | The impact response of dual layer honeycomb sandwich structure repaired with polymeric foam core plugs was studied using low-velocity centre and edge impact. The specimens are constructed using aluminium alloy honeycomb core layers (CRPIII-5052-1/8-.003N and CRPAA-5052-1/4-.002), polymeric foam (Divinycell H250 and H45) core plug and HEXPLY8552 laminates, with the repair implemented using bonded stepped repair. The impact tests were conducted using CADEX Twin Wire impact machine with an impactor weight of 5.468kg and impact energy of 90J. Test results were analysed using the Newtonian method, and the specimen was sectioned with waterjet cutting for damage characterisation. The use of polymeric foam core plugs in bonded stepped repair exhibited a lower peak load, similar energy signature, and a greater displacement when compared to the use of honeycomb core plug for centre impact. Damage characterisation revealed localised damage within the high-density foam core plug with no visible damage on the low-density foam core plug for centre impact. In the case of edge impact, the specimen exhibits similar damage characteristics to the specimen repaired with honeycomb core plugs. However, the specimen of the foam core plug showed greater damage depth and width on the honeycomb core layers. The preliminary Finite Element Model used to predict the impact response showed good agreement with the experimental results up to the point of peak load. However, discrepancies in the response were observed after the peak load was achieved. | URI: | https://hdl.handle.net/10356/177504 | Schools: | School of Mechanical and Aerospace Engineering | Fulltext Permission: | restricted | Fulltext Availability: | With Fulltext |
| Appears in Collections: | MAE Student Reports (FYP/IA/PA/PI) |
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|---|---|---|---|---|
| FYP_report_v3_LZB.PDF Restricted Access | 6.09 MB | Adobe PDF | View/Open |
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