In order to study the energy-absorbing mechanism of T700/3234 composite thin-walled circular tubes, the material properties were measured and the quasi-static axial crush tests of the thin-walled circular tubes were performed. The energy-absorbing indexes, such as, peak load (Fmax), and specific energy absorption (Es), et al of composite thin-walled circular tubes were observed. The effects of induced mechanism and ply orientation of composite material on failure modes and energy-absorbing characteristics of the tubes were analyzed. The test results showed that the initial crushing peak load can be significantly reduced by setting 45-degree outside chamfer at the crush top end of the circular tubes; different fiber ply orientations can lead to different failure modes, and then affect the energy-absorbing characteristics of the tubes accordingly. The finite element modeling method for thin walled-tube laminated shell was developed based on Puck 2000 and Yamada Sun failure criteria, the FE model was used to study the energy-absorbing characteristics of T700/3234 composite thin-walled circular tubes. Its accuracy was verified by comparing the simulated results with test ones. The comparison showed that the initial crushing peak load and the specific energy absorption simulated agree well with test ones.
Key words
composite thin-walled circular tubes /
inducement mechanism /
ply orientation /
laminated shell /
failure modes /
energy-absorbing characteristics.
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