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Investigation on Failure Parameters of J-C Damage Model of 18CrNiMo7-6 Alloy Steel
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[1]WU Shaoyang,ZHANG Jianwei,LU Fengqiang,et al.Investigation on Failure Parameters of J-C Damage Model of 18CrNiMo7-6 Alloy Steel[J].Journal of Zhengzhou University (Engineering Science),2023,44(01):70-76.[doi:10.13705/j.issn.1671-6833.2022.04.015]
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Journal of Zhengzhou University (Engineering Science)[ISSN 1671-6833/CN 41-1339/T] Volume: 44卷 Number of periods: 2023 01 Page number: 70-76 Column: Public date: 2022-12-06
Title:
Investigation on Failure Parameters of J-C Damage Model of 18CrNiMo7-6 Alloy Steel
Author(s):
WU Shaoyang1;  ZHANG Jianwei2;  LU Fengqiang1;  LI Yuanxin2;  QIN Jinhong1
1.School of Mechanical and Power Engineering, Zhengzhou University, Zhengzhou 450001, China; 
2.School of Mechanics and Safety Engineering, Zhengzhou University, Zhengzhou 450001, China
Keywords:
18CrNiMo7-6 alloy steel;  J-C damage model;  stress triaxiality;  failure strain;  Taylor impact tests
CLC:
O346. 5
DOI:
10.13705/j.issn.1671-6833.2022.04.015
Abstract:
In this study, three series of mechanical tests were carried out on 18CrNiMo7-6 alloy steel materials to determine the damage parameters of the Johnson-Cook (J-C) damage model, which could be widely used in numerical simulations such as high-speed impact and mechanical forming. Through the quasi-static tensile test and finite element simulation of notched specimens, the calculation method of stress triaxiality considering both spatial distribution effect and strain accumulation effect was determined. The results showed that the failure strain decreased with the increase of stress triaxiality. Through the tensile test at 10-3 s-1, 10 s-1 and 103 s-1 strain rates and the impact test of SHTB, it was found that the yield strength of the material increased with the increase of strain rate, indicating that the material had obvious strain rate strengthening effect, and the failure strain increased with the increase of strain rate. In the tensile tests at 25 ℃, 200 ℃, 300 ℃ and 400 ℃, it was found that the yield strength of the material decreased gradually with the increase of temperature, but the tensile strength of the material at 300 ℃ was higher than that at 200 ℃, and the failure strain decreased gradually with the increase of temperature. According to the above experimental results, the parameters of J-C damage model were fitted, and the reliability of the fitted parameters could be seen from the goodness of fit. Finally, experimental results and finite element results of Taylor test were compared. The results showed that when the impact speed was 430 m/s, the impact samples obtained from the experiment and simulation were damaged, and the maximum error between the failure mode of the samples obtained by finite element simulation and the experimental results was 6.3%. The rationality of the J-C damage model selected in this study and the effectiveness of the experimental parameters were verified.
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