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| Modeling and Life Prediction of Creep Behavior of Lightweight Alloys for Aircraft Cabin Structures |
| Received:March 28, 2025 Revised:May 12, 2025 |
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| DOI：10.7643/issn.1672-9242.2025.05.002 |
| KeyWord:creep creep damage ZM6 alloy constitutive model dislocation slip grain coarsening life prediction |
| Author | Institution |
| LI Hongmin |
School of Reliability and Systems Engineering, Beihang University, Beijing , China |
| TANG Yubin |
Aerospace Science and Industry Defense Technology Research and Test Center, Beijing , China |
| ZHAO Pengfei |
Aerospace Science and Industry Defense Technology Research and Test Center, Beijing , China |
| ZHANG Xiangyu |
Aerospace Science and Industry Defense Technology Research and Test Center, Beijing , China |
| ZHANG Shengpeng |
Aerospace Science and Industry Defense Technology Research and Test Center, Beijing , China |
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| Abstract: |
| The work aims to establish a creep constitutive model for the lightweight alloy of the aircraft cabin structures to predict the creep damage behavior and its life. Based on the creep damage mechanics model, a steady-state creep rate model determined by the material creep mechanism was introduced to establish an improved creep damage model. Uniaxial tensile creep tests and material microstructure analysis were conducted to determine the creep mechanism of the alloy. Considering the influence of the creep mechanism on the creep rate of the alloy, a dimensionless damage factor was established and substituted into the improved creep damage model to obtain the creep constitutive model of the alloy. According to the creep test and material microstructure analysis results of ZM6 alloy, it was determined that ZM6 alloy had the dislocation slip creep mechanism and grain coarsening creep damage. The model parameters of the ZM6 alloy creep constitutive model were determined by data fitting method. The prediction results of the ZM6 alloy creep constitutive model were compared with the test results, and the prediction error of the steady-state creep stage was less than 5%. In conclusion, this model can effectively predict the creep behavior of the lightweight alloy in the aircraft cabin structures, providing a basis for evaluating its storage life. |
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