Low Cycle Material Property Characterization and Life Prediction of Aluminum Alloy Piston

WANG Wenjie; XU Chunguang; WANG Guoying; WANG Genquan; JIA Xiaoliang; ZHAO Zhiqiang; REN Lu

doi:10.3969/j.issn.1001-2222.2020.03.009

Vehicle Engine ›› 2020, Vol. 0 ›› Issue (3) : 57. DOI: 10.3969/j.issn.1001-2222.2020.03.009

Low Cycle Material Property Characterization and Life Prediction of Aluminum Alloy Piston

WANG Wenjie¹，XU Chunguang²，WANG Guoying²，WANG Genquan²，JIA Xiaoliang³，ZHAO Zhiqiang²，REN Lu²

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Abstract

Low cycle fatigue test of aluminum alloy material was carried out through the piston of diesel engine. The plastic properties of aluminum alloy material for piston were characterized according to RambergOsgood model and the characterized parameters had good agreement with the test data. The low cycle fatigue properties were then characterized by plastic strain energy theoretical model. The plastic strain energy of aluminum alloy material had a good linear relationship with the fatigue life in doublelogarithmic coordinate systems. The nonlinear bearing characteristics of aluminum alloy piston were studied under low cycle lasting conditions and the fatigue life was predicted according to the stressstrain relationship curve of piston in the fifth cycle. The results show that the throat of piston combustion chamber has the lowest low cycle fatigue life and should be specially considered during the material selection and structural design of pistons.

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piston / aluminum alloy / plastic property / strain energy / low cycle fatigue / life prediction

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WANG Wenjie，XU Chunguang，WANG Guoying，WANG Genquan，JIA Xiaoliang，ZHAO Zhiqiang，REN Lu. Low Cycle Material Property Characterization and Life Prediction of Aluminum Alloy Piston[J]. Vehicle Engine. 2020, 0(3): 57 https://doi.org/10.3969/j.issn.1001-2222.2020.03.009