ACTA AERONAUTICAET ASTRONAUTICA SINICA >
Experimental Study of Constitutive Relationship of Superalloy GH4169 Under High Strain Rates
Received date: 2012-04-06
Revised date: 2012-07-17
Online published: 2013-04-23
Finite element numerical simulation of the cutting of superalloy GH4169 is based on its constitutive model, which describes the relationship between stress and strain under high strain rates. In this paper, the constitutive relationship of superalloy GH4169 with temperature in the range from room temperature to 1 000 ℃ and strain rates in the range of 2 000-10 000 s-1 is studied by experiments. The results show that the relationship between flow stress and plastic strain is close to linear relationship. Meanwhile temperature affects the degree and mode of the influence of strain rate on the constitutive relationship. According to the characteristics of flow stress curve of superalloy GH4169, the Johnson-Cook constitutive model is modified. Based on experimental results, the constitutive parameter values are determined by data fitting and a constitutive model of superalloy GH4169 is built. The work of this paper provides not only a basis for the numerical simulation of cutting superalloy GH4169, but also a useful reference for similar studies in future.
Key words： constitutive relationship; flow stress; high strain rate; GH4169; superalloys
WANG Tao , CHEN Guoding , JU Jiangtao . Experimental Study of Constitutive Relationship of Superalloy GH4169 Under High Strain Rates[J]. ACTA AERONAUTICAET ASTRONAUTICA SINICA, 2013 , 34(4) : 946 -953 . DOI: 10.7527/S1000-6893.2013.0155
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