Flexural strength enhancement study of aluminum-CFRP at liquid nitrogen temperature

CHENG Fei; HU Yunsen

doi:10.13801/j.cnki.fhclxb.20210616.003

Volume 39 Issue 6

Jun. 2022

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CHENG Fei, HU Yunsen. Flexural strength enhancement study of aluminum-CFRP at liquid nitrogen temperature[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 3009-3019. doi: 10.13801/j.cnki.fhclxb.20210616.003

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CHENG Fei, HU Yunsen. Flexural strength enhancement study of aluminum-CFRP at liquid nitrogen temperature[J]. Acta Materiae Compositae Sinica, 2022, 39(6): 3009-3019. doi: 10.13801/j.cnki.fhclxb.20210616.003

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Flexural strength enhancement study of aluminum-CFRP at liquid nitrogen temperature

doi: 10.13801/j.cnki.fhclxb.20210616.003

CHENG Fei^{1
,
,},
HU Yunsen²

1.
School of Materials Science and Engineering, Southwest University of Science and Technology, Mianyang 621000, China
2.
Department of Mechanical Engineering, University of Western Australia, Perth 410082, Australia

Received Date: 2021-05-17
Accepted Date: 2021-06-10
Rev Recd Date: 2021-06-08

Available Online: 2021-06-17

Publish Date: 2022-06-01

Abstract

Abstract

The adhesive bonding strength enhancement of aluminum substrate and carbon fiber reinforced polymer (CFRP) at cryogenic temperature has attracted far-ranging attention with their application expanding to rocket booster. Aiming at the potential bonding interface defect of epoxy joint, we adopted the anodizing and sanding treatments to modify surface performance of Al substrate and CFRP panel respectively. The resin pre-coating (RPC) technique was used to eliminate the originally existing defect caused by macromolecular epoxy at the root of porous Al substrate. The carbon nanotubes were applied as additives to be impregnated into channels on Al substrate surface via RPC technique and construct the quasi-Z directional fiber bridging, which can further improve the adhesive bonding strength of epoxy joint. The three-point bending (3-P-B) results show the flexural strength of aluminum substrate-CFRP after treated has been enhanced by 14.6% at room temperature, and even higher 27.6% at liquid nitrogen temperature based on that of the one only cleaned by acetone. Failure mode exhibits the weaker adhesive failure on bonding interface has been transformed into main structure fracture failure of CFRP after combined surface treatments at both room temperature and liquid nitrogen temperature. Overall, the effective treatment methods can offer an alternative reference in industrial application of cryogenic liquid fuel tank.
- electrochemical etching,
- adhesive bonding strength improving,
- quasi-Z-directional carbon nano-tubes,
- resin pre-coating,
- liquid nitrogen temperature
Long Abstrsct
Innovation Points

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References(35)

References

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