Advanced constitutive modeling and application to industrial forming processes

Barlat, Frédéric; Kim, Dong-Jin

doi:10.1051/matecconf/20168015013

“…The strong temperature-and rate-dependent flow stress of aluminum alloy sheet under warm forming conditions can be empirically modeled through traditional hardening law coupled with strain rate dependency. These phenomenological models having accurate constitutive description ability are still greatly in demand [1]. The Wagoner model, which associated Swift hardening law with strain rate dependency, has been successfully applied to the flow stress description of aluminum alloy under warm conditions [2,3].…”

Section: Introductionmentioning

confidence: 99%

A Modified Peric Model for Al-Mg Alloy Sheet with Rate-Independent Initial Yield Stress at Warm Temperatures

Zhang

¹

,

Zhang

²

,

Sun

³

et al. 2019

SSP

0

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The constitutive modeling of aluminum alloy under warm forming conditions generally considers the influence of temperature and strain rate. It has been shown by published flow stress curves of Al-Mg alloy that there is nearly no effect of strain rate on initial yield stress at various temperatures. However, most constitutive models ignored this phenomenon and may lead to inaccurate description. In order to capture the rate-independent initial yield stress, Peric model is modified via introducing plastic strain to multiply the strain rate, for eliminating the effect of strain rate when the plastic strain is zero. Other constitutive models including the Wagoner, modified Hockett–Sherby and Peric are also considered and compared. The results show that the modified Peric model could not only describe the temperature-and rate-dependent flow stress, but also capture the rate-independent initial yield stress, while the Wagoner, modified Hockett–Sherby and Peric model can only describe the temperature-and rate-dependent flow stress. Moreover, the modified Peric model could obtain proper static yield stress more naturally, and this property may have potential applications in rate-dependent simulations.

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“…The strong temperature-and rate-dependent flow stress of aluminum alloy sheet under warm forming conditions can be empirically modeled through traditional hardening law coupled with strain rate dependency. These phenomenological models having accurate constitutive description ability are still greatly in demand [1]. The Fields-Backofen model [2] which directly associated with the strain rate could be selected to represent the flow stress of Al 6111-T4 [3].…”

Section: Introductionmentioning

confidence: 99%

A Modified Peric Model for Al-Mg Alloy Sheet with Rate-Independent Initial Yield Stress at Warm Temperatures

Zhang

¹

,

Zhang

²

,

Sun

³

et al. 2018

AEF

0

View full text Add to dashboard Cite

The constitutive modeling of aluminum alloy under warm forming conditions generally considers the influence of temperature and strain rate. It has been shown by published flow stress curves of Al-Mg alloy that there is nearly no effect of strain rate on initial yield stress at various temperatures. However, most constitutive models ignored this phenomenon and may lead to inaccurate description. In order to capture the rate-independent initial yield stress, Peric model is modified via introducing plastic strain to multiply the strain rate, for eliminating the effect of strain rate when the plastic strain is zero. Other constitutive models including the Wagoner, modified Hockett–Sherby and Peric are also considered and compared. The results show that the modified Peric model could not only describe the temperature-and rate-dependent flow stress, but also capture the rate-independent initial yield stress, while the Wagoner, modified Hockett–Sherby and Peric model can only describe the temperature-and rate-dependent flow stress. Moreover, the modified Peric model could obtain proper static yield stress more naturally, and this property may have potential applications in rate-dependent simulations.

show abstract