Multiaxial fatigue behavior and life prediction of aerospace aluminum alloy under pre-corrosion and alternate corrosion

CHEN Yajun; LIU Chenchen; WANG Fusheng

doi:10.7527/S1000-6893.2018.22465

ACTA AERONAUTICAET ASTRONAUTICA SINICA >

2019 , Vol. 40 >Issue 4: 222465 - 222465

DOI: https://doi.org/10.7527/S1000-6893.2018.22465

Solid Mechanics and Vehicle Conceptual Design

Multiaxial fatigue behavior and life prediction of aerospace aluminum alloy under pre-corrosion and alternate corrosion

CHEN Yajun ,
LIU Chenchen ,
WANG Fusheng

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Sino-European Institute of Aviation Engineering, Civil Aviation University of China, Tianjin 300300, China

Received date: 2018-06-20

Revised date: 2019-07-17

Online published: 2018-09-17

Supported by

National Natural Science Foundation of China (11502285); Tianjin Science and Technology Support Project (18JCTPJC66800); the Fundamental Research Funds for the Central Universities (ZYGX2018020)

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Abstract

When aircraft is in service in a corrosive environment, its damage mode shows an alternate process of corrosion on ground and fatigue in air. Based on the characteristic of this working condition, the effects of pre-corrosion and alternate corrosion on multiaxial fatigue behavior of 2024-T4 and 7075-T651 aerospace aluminum alloys are studied. Under the same equivalent stress amplitude, with the increase of the pre-corrosion time, the number and size of pits on specimen's surface augment, indicating that the weight of corrosive influence increases and the multiaxial fatigue life of the two alloys decreases. When the unit loading units hold constant, the unit corrosion time increases, decreasing the multiaxial fatigue life. With the augmentation of the alternate stage, corrosion on the surface of specimen tends to be more severe. Based on the Miner model and life data from pre-corrosion fatigue tests, a modified accumulative damage model is proposed, which shows fine results within 2x scatter bands in alternate corrosion-multiaxial fatigue life prediction.

Key words： aluminum alloy; pre-corrosion; alternate corrosion; multiaxial fatigue; life prediction

Cite this article

CHEN Yajun , LIU Chenchen , WANG Fusheng . Multiaxial fatigue behavior and life prediction of aerospace aluminum alloy under pre-corrosion and alternate corrosion[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2019 , 40(4) : 222465 -222465 . DOI: 10.7527/S1000-6893.2018.22465

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