Degradation of the Protection System for Civil Aircraft Hybrid Connection Structures under Environmental Impact

ZHOU Yu; LUO Chen; SUN Zhihua; HUANG Mengyao; BAI Hongbo

doi:10.7643/issn.1672-9242.2026.04.007

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (4) : 69-80. DOI: 10.7643/issn.1672-9242.2026.04.007

Aviation and Aerospace Equipment

Degradation of the Protection System for Civil Aircraft Hybrid Connection Structures under Environmental Impact

ZHOU Yu¹, LUO Chen^1,*, SUN Zhihua¹, HUANG Mengyao², BAI Hongbo³

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Abstract

The work aims to investigate the impact of fatigue loading and mold growth on the degradation behavior of the coating protection system of aircraft connection structures. Laboratory accelerated tests simulating the marine atmospheric environment were conducted on coated connectors of 2024 aluminum alloy and carbon fiber epoxy composite materials under 3 experimental conditions: no pretreatment, fatigue pretreatment, and mold pretreatment. The corrosion damage of the coated connectors was compared after accelerated tests for different time. The analytic hierarchy process was used to calculate the weights of five indicators, namely peeling size, cracking size, blistering size, color difference, and gloss loss rate, which were 0.49, 0.24, 0.13, 0.07, and 0.07 respectively. Based on the obtained weights, the damage degrees of the specimens with no pretreatment, fatigue pretreatment, and mold pretreatment were calculated to be 1.06, 3.84, and 3.59 respectively. The fatigue fracture cycle numbers of the coated connectors in the three groups (no pretreatment, fatigue pretreatment, and mold pretreatment) after the laboratory accelerated test were 345 315, 294 945, and 340 042 respectively. After fatigue pretreatment and mold pretreatment, the damage degree of the coated connectors increases by more than three times compared with that of the specimens without pretreatment. The fatigue life of the coated connectors after fatigue pretreatment and then the accelerated test decreases significantly.

Key words

connection structure / coating aging / blistering / cracking / peeling / fatigue life / analytic hierarchy process (AHP)

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ZHOU Yu, LUO Chen, SUN Zhihua, HUANG Mengyao, BAI Hongbo. Degradation of the Protection System for Civil Aircraft Hybrid Connection Structures under Environmental Impact[J]. Equipment Environmental Engineering. 2026, 23(4): 69-80 https://doi.org/10.7643/issn.1672-9242.2026.04.007

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