Experimental Damage Investigation of Composite Plates Subjected to Impact Loading Conditions
The use of synthetic fibers such as glass fiber and aramid fiber carbon fiber as composite reinforcement is being increasingly applied in high performance applications since they provide certain advantage of specific high strength and stiffness as compared to metallic materials. In contrast, impl...
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| Main Author: | |
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| Format: | Thesis |
| Language: | English English |
| Published: |
2003
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/7990/1/ITMA_2003_3_.pdf |
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| Summary: | The use of synthetic fibers such as glass fiber and aramid fiber carbon fiber as
composite reinforcement is being increasingly applied in high performance
applications since they provide certain advantage of specific high strength and
stiffness as compared to metallic materials. In contrast, implementation of natural
fiber as reinforcement has not yet received adequate attention from the research
community.
This study investigates the damage characterization and impact resistance of
synthetic and natural fiber reinforced composite square plates subjected to the
changes of impact loading and width over thickness (bId) ratio of the composite.
For low velocity impact, the testing was performed using Dynatup 8250 equipped
with GRC 930-1 Data Interpretation System on fabricated square plates with
different impact energy levels and velocities. The severity of impact damage is macroscopically and microscopically investigated. A compressed gas gun
equipped with velocity measurement system was designed and fabricated in
order to facilitate the high velocity impact testing experimentations.
From the results, it has been found that mechanical and impact properties of
EFBC and CFC do not posses toughness and modulus as high as GRC.
Although EFBC and CFC specimens eXllibit total perforation to the specimens at
most impact velocities, EFBC specimen with plate thickness of 8 millimetres was
found to have penetration resistance at 22 joules of impact energy level. This is
due the performance of Coir as reinforcement in polymer composites is
unsatisfactory and not comparable with other natural fibers due to its mechanical
properties. It can also be conclude that the impact response of EFBC and CFC
specimen chances significantly as the composite thickness increases.
Impact damage was found to be in the forms of matrix cracking, fiber fracture and
perforation. This study results can be a valuable reference in designing of
lightweight composite structure and in developing a better understanding of test
methods used to characterize impact behaviours. |
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