Flow and fracture behavior of aluminum alloy 6082-T6 at different tensile strain rates and triaxialities

被引:40
作者
Chen, Xuanzhen [1 ]
Peng, Yong [1 ,2 ]
Peng, Shan [1 ]
Yao, Song [1 ]
Chen, Chao [3 ]
Xu, Ping [1 ]
机构
[1] Cent S Univ, Key Lab Traff Safety Track, Sch Traff & Transportat Engn, Minist Educ, Changsha, Hunan, Peoples R China
[2] Cent S Univ, State Key Lab High Performance Complex Mfg, Changsha, Hunan, Peoples R China
[3] Hunan Ind Polytech, Changsha, Hunan, Peoples R China
基金
中国国家自然科学基金;
关键词
STRESS TRIAXIALITY; CONSTITUTIVE MODELS; DUCTILE FRACTURE; STEEL; TEMPERATURES; STRENGTH; FAILURE; GROWTH;
D O I
10.1371/journal.pone.0181983
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
This study aims to investigate the flow and fracture behavior of aluminum alloy 6082-T6 (AA6082-T6) at different strain rates and triaxialities. Two groups of Charpy impact tests were carried out to further investigate its dynamic impact fracture property. A series of tensile tests and numerical simulations based on finite element analysis (FEA) were performed. Experimental data on smooth specimens under various strain rates ranging from 0.0001 similar to 3400 s(-1) shows that AA6082-T6 is rather insensitive to strain rates in general. However, clear rate sensitivity was observed in the range of 0.001 similar to 1 s(-1) while such a characteristic is counteracted by the adiabatic heating of specimens under high strain rates. A Johnson-Cook constitutive model was proposed based on tensile tests at different strain rates. In this study, the average stress triaxiality and equivalent plastic strain at facture obtained from numerical simulations were used for the calibration of J-C fracture model. Both of the J-C constitutive model and fracture model were employed in numerical simulations and the results was compared with experimental results. The calibrated J-C fracture model exhibits higher accuracy than the J-C fracture model obtained by the common method in predicting the fracture behavior of AA6082-T6. Finally, the Scanning Electron Microscope (SEM) of fractured specimens with different initial stress triaxialities were analyzed. The magnified fractographs indicate that high initial stress triaxiality likely results in dimple fracture.
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页数:28
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