Journal of Shanghai Jiaotong University ›› 2018, Vol. 52 ›› Issue (5): 587-592.doi: 10.16183/j.cnki.jsjtu.2018.05.013

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Oxygen Free Copper Dynamic Mechanical Property in High Speed Machining Process

YU Jianchao,LIN Youxi   

  1. School of Mechanical Engineering and Automation, Fuzhou University, Fuzhou 350116, China
  • Online:2018-05-28 Published:2018-05-28

Abstract: Hopkinson pressure bar experiments of oxygen free copper in high speed machining process were carried out with temperature ranging from 20℃ to 900℃ and strain rate ranging from 1.0×103 to 1.5×104s-1. The true stress-true strain curves obtained from experiments showed that the mechanical property of oxygen free copper showed obvious strain rate and temperature sensitivity. The flow stress increased significantly with the increase of strain rate and decreased with the increase of deformed temperature. The empirical Johnson-Cook constitutive model had a large error in describing the dynamic mechanical property. Based on the analysis of dynamic mechanical property, a modified Johnson-Cook constitutive model was proposed. It can predicte experimental results well, and then can be used to simulate dynamic mechanical property of oxygen free copper in high speed machining process.

Key words: oxygen free copper, high speed machining, dynamic mechanical property, constitutive model

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