Axial and Lateral Quasi-Static Crushing Behaviour of Segmented and Non-Segmented Composite Tubes
Considerable research interest has been directed towards the use of composite for crashworthiness applications, because they can be designed to provide impact energy absorption capabilities which are superior to those of metals when compared on weight basis. The use of composite circular tubes i...
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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/7987/1/ITMA_2003_1_.pdf |
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| Summary: | Considerable research interest has been directed towards the use of composite for
crashworthiness applications, because they can be designed to provide impact energy
absorption capabilities which are superior to those of metals when compared on
weight basis. The use of composite circular tubes i n structural applications IS
becoming more widespread throughout the auto motives, aircraft industry.
This work examines the effect of segmentation on the crushing behaviour, energy
absorption and failure mode of composite circular tubes. The segmented composite
tube consists of more than one material, each with its own specific functions.
Through out this study, segmented and non segmented composite tubes with
different sequences were experimentally investigated under axial and lateral loading
conditions. The effect of fibre reinforcement type and segments sequence on energy
absorption and load carrying capacity were also presented and discussed. Load-displacement curves and deformation histories of typical specimens are
presented and discussed. The results showed that non-segmented composite tubes
were found to be very brittle (i.e. tissue mat glass fibre/epoxy tubes), and show very
low initial failure crush load value of 1 .8 9kN, as well as low specific energy
absorption value of O.065kJ/kg under axial crushing. Whereas, the carbon fabric fibre
reinforced plastic (CFRP) tubes showed highest load-carrying capacity among the
tested specimens with initial fai lure crush load value of I8.85kN as well as specific
energy absorption value of I9 .27kJ/kg.
On the other hand, segmented composite tubes including the tissue mat glass fibres
were found to suffer from low energy absorption and the catastrophic failure
mechanism initiated at the part made of tissue mat glass fibre/epoxy. Segmented
Composite tubes from carbon fabric fibre and cotton fabric fibres exhibited good
specific energy absorption value of 13.53 kj/kg as well as stable load-carrying
capacity under axial loading. A change in segmentation sequence affects the crush
loads significantly just for double fibre segmented composite tubes under lateral
loading.
The axial loaded segmented composite tubes have better load carrying capacity and
energy absorption capability compared to the laterally loaded segmented composite
tubes, and the failure modes were quite different. |
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