TY - JOUR
T1 - Constitutive Modelling of Impact Flow Behaviour of 7075-T6 Aluminium Alloy
AU - Lee, Woei Shyan
AU - Liang, Pao Ting
N1 - Funding Information:
The authors gratefully acknowledge the financial support provided to this study by the Ministry of Science and Technology of the Republic of China under Grant No. MOST 103-2221-E-006-036.
Publisher Copyright:
© 2016, Chinese Mechanical Engineering Society. All right reserved.
PY - 2016/12/1
Y1 - 2016/12/1
N2 - A compressive split-Hopkinson pressure bar (SHPB) system was used to investigate the impact flow behaviour of 7075-T6 aluminium alloy in the longitudinal and transverse directions. The impact tests were performed at strain rates of 1 ×103 s-1, 2×103 s-1, 3×103 s-1 and 5 ×103 s-1, respectively, under temperatures of 25℃ and 350℃ for the longitudinal specimens and 25℃ for the transverse specimens. The results showed that the strain rate, temperature and grain structure direction all have a significant effect on the flow behaviour. The measured stress-strain response of the 7075-T6 specimens was fitted using both the Zerilli-Armstrong (ZA) model and the combined Johnson-Cook and Zerilli-Armstrong (JC-ZA) model. Notably, both models take account of the coupled effect of the strain rate and temperature on the flow stress. The predicted stress-strain values obtained from the two models were compared with the experimental data. It was found that the results obtained from both models were in good agreement with the experimental observations. However, the accuracy of the JC-ZA model was slightly better than that of the ZA model. The superior performance of the JC-ZA model can be attributed to the joint consideration of both the yield and strain hardening phenomena and the coupled effects of the temperature and strain rate on the flow behaviour.
AB - A compressive split-Hopkinson pressure bar (SHPB) system was used to investigate the impact flow behaviour of 7075-T6 aluminium alloy in the longitudinal and transverse directions. The impact tests were performed at strain rates of 1 ×103 s-1, 2×103 s-1, 3×103 s-1 and 5 ×103 s-1, respectively, under temperatures of 25℃ and 350℃ for the longitudinal specimens and 25℃ for the transverse specimens. The results showed that the strain rate, temperature and grain structure direction all have a significant effect on the flow behaviour. The measured stress-strain response of the 7075-T6 specimens was fitted using both the Zerilli-Armstrong (ZA) model and the combined Johnson-Cook and Zerilli-Armstrong (JC-ZA) model. Notably, both models take account of the coupled effect of the strain rate and temperature on the flow stress. The predicted stress-strain values obtained from the two models were compared with the experimental data. It was found that the results obtained from both models were in good agreement with the experimental observations. However, the accuracy of the JC-ZA model was slightly better than that of the ZA model. The superior performance of the JC-ZA model can be attributed to the joint consideration of both the yield and strain hardening phenomena and the coupled effects of the temperature and strain rate on the flow behaviour.
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M3 - Article
AN - SCOPUS:85031312790
SN - 0257-9731
VL - 37
SP - 547
EP - 554
JO - Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
JF - Journal of the Chinese Society of Mechanical Engineers, Transactions of the Chinese Institute of Engineers, Series C/Chung-Kuo Chi Hsueh Kung Ch'eng Hsuebo Pao
IS - 6
ER -