Method for Remaining Life Assessment of Highly Degraded Bellows

ZHONG Yunlong; HUANG Yonghua; WU Dong; DING Rong; YAN Liuchuan

doi:10.7643/issn.1672-9242.2026.03.018

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Equipment Environmental Engineering ›› 2026, Vol. 23 ›› Issue (3) : 170-175. DOI: 10.7643/issn.1672-9242.2026.03.018

Special Issue—Equipment Service Environment and Performance Testing

Method for Remaining Life Assessment of Highly Degraded Bellows

ZHONG Yunlong^1,2, HUANG Yonghua^1,2,*, WU Dong^1,2, DING Rong^1,2, YAN Liuchuan^1,2

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Abstract

The work aims to address the stress relaxation failure problem of the vacuum bellows in the aviation pressure regulation equipment due to long-term exposure to temperature and pressure loads. A new method for predicting the remaining life based on the residual height degradation was proposed. By designing a dedicated test device to simulate the actual working conditions (temperature ranging from 100 to 130 ℃, load of 120 N), with a height permanent deformation rate of ≥3.4% as the failure criterion, four groups of temperature gradients (100 ℃, 110 ℃, 120 ℃, 130 ℃) were set up, with 3 samples in each group. Height degradation prediction and accelerated life tests were carried out to obtain free height degradation data at 10 different time points. Based on the test data, the relationship between the performance degradation rate and temperature was established with the Arrhenius model. The accuracy of the model was verified through correlation checks, and the remaining life assessment calculation model under different temperature conditions was further derived. According to the failure criterion, the actual working life of the product could be predicted. This remedies the engineering gap in the calendar life assessment of the bellows and has the advantages of simple operation, low cost, and engineering feasibility for promotion. It provides key technical support for predicting the remaining life of aviation pressure regulation equipment and preventing field failures.

Key words

bellows / residual life prediction / height degradation / temperature / accelerated life test / Arrhenius model

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ZHONG Yunlong, HUANG Yonghua, WU Dong, DING Rong, YAN Liuchuan. Method for Remaining Life Assessment of Highly Degraded Bellows[J]. Equipment Environmental Engineering. 2026, 23(3): 170-175 https://doi.org/10.7643/issn.1672-9242.2026.03.018

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Funding

Special Fund for Promoting High-Quality Economic Development of Guangdong Province (JQR246205070); Fund of the Fifth Research Institute of Electronics, Ministry of Industry and Information Technology (24Z05)