| CAI Qiang,ZHANG Yi,LI Chuang,ZOU Run.Fretting Fatigue Life Prediction of ZL702A Aluminum Alloy Components[J],46(4):252-257 |
| Fretting Fatigue Life Prediction of ZL702A Aluminum Alloy Components |
| Received:November 30, 2016 Revised:April 20, 2017 |
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| DOI：10.16490/j.cnki.issn.1001-3660.2017.04.041 |
| KeyWord:ZL702A aluminum alloy fretting wear fretting fatigue finite element method life prediction |
| Author | Institution |
| CAI Qiang |
School of Mechanics and Power Engineering, North University of China, Taiyuan , China |
| ZHANG Yi |
School of Mechanics and Power Engineering, North University of China, Taiyuan , China |
| LI Chuang |
School of Mechanics and Power Engineering, North University of China, Taiyuan , China |
| ZOU Run |
School of Mechanics and Power Engineering, North University of China, Taiyuan , China |
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| Abstract: |
| This work aims to study fretting damage mechanism of ZL702A aluminum alloy and find an appropriate prediction model for fretting fatigue life. Fretting fatigue experiment was carried out to ZL702A aluminum alloy by designing fretting simulation item composed of square foot bridge and specimen. Surface morphology of the fractured specimen was observed with 4XC-PC metallographic microscope, and mechanism of fretting damage was discussed. The finite element model composed of square foot bridge and specimen was established, fretting characteristic parameters including shear strain amplitude, normal stress and relative slip distance were subject to programmed calculation. FS, KBM, McDiarmid and Ruiz parameters were applied to predict fretting fatigue life of ZL702A aluminum alloy. Fatigue cracks mainly nucleate in local plastic zone, shear strain could accelerate the formation of crack nucleus, fatigue crack growth was a process of continuous polymerization of crack tip, normal stress/strain on the crack surface accelerated this polymerization. When normal load remained constant, fretting damage increased with the increase of maximum axial force. Life prediction model results of 4 kinds of fretting fatigue showed that most severe fretting damage was present in edges of specimen contact zone and may produce fretting cracks, which were consistent with experiment value. Prediction results of fretting fatigue life showed that error between results predicted based on Ruiz parameters and experimental results fell within dual factor in tolerance zone, and the prediction results were most close to experiment value. Fretting wear zone can be divided into adhesive zone, mixing zone and sliding zone. Plastic deformation is most likely present along the boundary of mixing zone, and thus producing fretting fatigue cracks easily. The prediction results show that it’s feasible to predict fretting fatigue life of ZL702A aluminum alloy based on Ruiz parameters. |
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