Axial crushing response and failure mechanism of  variable stiffness carbon fiber/epoxy resin composite thin-walled tube

SONG Tao; YU Xuduo; JIANG Shengda; YU Muhuo; FAN Liangwei; SUN Zeyu

doi:10.13801/j.cnki.fhclxb.20210126.002

Volume 38 Issue 11

Nov. 2021

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SONG Tao, YU Xuduo, JIANG Shengda, et al. Axial crushing response and failure mechanism of variable stiffness carbon fiber/epoxy resin composite thin-walled tube[J]. Acta Materiae Compositae Sinica, 2021, 38(11): 3586-3600. doi: 10.13801/j.cnki.fhclxb.20210126.002

Citation:

SONG Tao, YU Xuduo, JIANG Shengda, et al. Axial crushing response and failure mechanism of variable stiffness carbon fiber/epoxy resin composite thin-walled tube[J]. Acta Materiae Compositae Sinica, 2021, 38(11): 3586-3600. doi: 10.13801/j.cnki.fhclxb.20210126.002

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Axial crushing response and failure mechanism of variable stiffness carbon fiber/epoxy resin composite thin-walled tube

doi: 10.13801/j.cnki.fhclxb.20210126.002

SONG Tao^{1, 2, 3
,},
YU Xuduo^4
,,
JIANG Shengda²,
YU Muhuo^{1, 2
,},
FAN Liangwei^5
,,
SUN Zeyu^{1, 2, 3
,
,}

1.
College of Materials Science and Engineering, Donghua University, Shanghai 201620, China
2.
Shanghai Key Laboratory of Lightweight Structural Composites, Donghua University, Shanghai 201620, China
3.
Shanghai Collaborative Innovation Center for High Performance Fiber Composites, Donghua University, Shanghai 201620, China
4.
Shanghai Huayu New Materials Tech.Inc, Shanghai 201610, China
5.
SAIC Motor Corporation Limited Passenger Vehicle Co, Shanghai 201804, China

Received Date: 2020-11-25
Accepted Date: 2021-01-13

Available Online: 2021-01-26

Publish Date: 2021-11-01

Abstract

Abstract

The fiber angles of the winding tubes were changed by controlling the winding lines to realize the gradual change of the stiffness along the axial direction, and then the collapse-stable carbon fiber/epoxy resin composite thin-walled tubes with variable stiffness were fabricated. Finally, the axial quasi-static crushing tests were carried out for three types of winding tubes with variable stiffness, [±45°]_n and [90°]_n structures. Combined with digital image correlation (DSC) technology and finite element analysis results, the initial strain modes, damage evolution and stress states were compared to study the crushing response and failure mechanism of variable stiffness structures. The results show that the initial failure and damage evolution of the tubes with different fiber angles are different due to the various axial stiffness, so the different crushing response and failure modes are generated respectively, and the continuously changing circular fibers in the variable stiffness zone can effectively cause the delaminated and “flowering” mode mixed damage to release the strain energy slowly. Therefore, the energy absorption effect of the variable stiffness structure is obviously better than that of other two structures. Its peak load is 66.97 kN, crushing efficiency is 50.8%, and specific energy absorption is 10.1 kJ/kg. Compared with the [±45°]_n structure, the specific energy absorption increases by 156.35%, and the crushing efficiency increases by 518.76%. Compared with the [90°]_n structure, the specific energy absorption increases by 16.9%, and the crushing efficiency reduces by 27.3%.
- variable stiffness,
- composite structure,
- thin-walled tube,
- crushing test,
- failure mechanism,
- digital image correlation,
- finite element analysis
Long Abstrsct
Innovation Points

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References(23)

References

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