Research and revise on constitutive equation of 7050-T7451 aluminum alloy in high strain rate and high temperature condition

The flow stress behavior of 7050-T7451 aluminum alloy at high temperature and high strain rate was investigated by split Hopkinson pressure bar (SHPB) and quasi-static test system. The strain hardening parameters were obtained by the quasi-static test experiment data. The strain rate hardening param...

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Bibliographic Details
Published inCai liao gong cheng = Journal of materials engineering no. 12; pp. 7 - 13
Main Authors Hua, Yong-Zhi, Guan, Li-Wen, Liu, Xin-Jun, Cui, Hai-Long
Format Journal Article
LanguageChinese
Published 01.12.2012
Subjects
Alloy systems
Aluminum base alloys
Constitutive equations
Constitutive relationships
High strain rate
Mathematical analysis
Softening
Strain rate
Stress-strain relationships
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Summary:The flow stress behavior of 7050-T7451 aluminum alloy at high temperature and high strain rate was investigated by split Hopkinson pressure bar (SHPB) and quasi-static test system. The strain hardening parameters were obtained by the quasi-static test experiment data. The strain rate hardening parameter at various strain rates (400-2500s(-1)) and room temperature, and the thermal softening parameter at various temperatures where strain rate is 2500s(-1), were obtained by the split Hopkinson pressure bar experiment data. A new thermal softening equation is proposed to revise the Johnson-Cook constitutive equation, where the a quintic polynomial equation is choosed as the new thermal softening equation. According to the comparison between predict curves and experiment curves of stress-strain at various temperatures, the modified constitutive equation can fit the experiment date well.
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ISSN:1001-4381