Constitutive modeling of flow behavior and microstructure evolution of AA7075 in hot tensile deformation

Xiao, Wenchao; Wang, Baoyu; Wu, Yong; Yang, Xiaofeng

doi:10.1016/j.msea.2017.12.028

Cited by 84 publications

(46 citation statements)

References 39 publications

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“…However, when the temperature increased to 450 °C, the FLC decreased obviously, with a similar level to that of 300 °C. This characteristic of the FLCs is similar to that in the uniaxial hot tensile tests [26], both indicated that the formability of the material is best at 400 °C.…”

Section: Thermal Forming Limitssupporting

confidence: 70%

“…(5) The meanings and values of material constants in Eq. (5) have been reported previously [26]. Based on this, only the material constants in Eq.…”

Section: Constitutive Modelingmentioning

confidence: 97%

“…A set of uniaxial constitutive equations has been established to analyze the flow behavior and microstructure evolution of AA7075 under uniaxial hot tensile tests [26]. In the metal sheet forming process, it is usually assumed that the sheet is in plane stress state as the stress in the thickness direction is extremely small [27].…”

Section: Constitutive Modelingmentioning

confidence: 99%

“…Average strain rates corresponding to the stamping speeds of 13 mm/s, 20 mm/s and 40 mm/s are 0.130 s −1 , 0.206 s −1 , 0.410 s −1 , respectively. In the uniaxial thermal tensile tests of AA7075 sheet at 400 °C [26], when strain rate increased 100 times from 0.01 to 1 s −1 , the ultimate strain of the material only increased in a very small amount. As the strain rate in the forming limit tests only increased by three times from 0.130 to 0.410 s −1 , the influence of…”

Section: Constitutive Modelingmentioning

confidence: 99%

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Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

Xiao

Wang

2020

Archiv.Civ.Mech.Eng

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The aluminum hot stamping process has been widely studied to produce lightweight parts in automobile industry. As forming limit of aluminum sheet at elevated temperatures plays a vital role in judging stamping formability, this study aims at experimentally investigating the forming limits and establishing a constitutive model to predict them. In this study, isothermal deformation test (Nakajima test) of AA7075 was conducted to determine its forming limits at temperatures of 300-450 °C and stamping speeds of 13-40 mm/s. Based on the experimental results, a constitutive model considering continuum damage mechanics was established to predict the forming limits under different deformation conditions. It was found that the formability of the material is best at 400 °C, and a higher strain rate can improve formability slightly. The comparisons between model predictions and experimental results were evaluated; results indicated a good prediction accuracy of the model in describing forming limits of AA7075 at elevated temperatures. Moreover, comparison between different studies on the thermal forming limits of AA7075 was discussed in detail.

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Section: Thermal Forming Limitssupporting

confidence: 70%

“…(5) The meanings and values of material constants in Eq. (5) have been reported previously [26]. Based on this, only the material constants in Eq.…”

Section: Constitutive Modelingmentioning

confidence: 97%

Section: Constitutive Modelingmentioning

confidence: 99%

Section: Constitutive Modelingmentioning

confidence: 99%

See 2 more Smart Citations

Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

Xiao

Wang

2020

Archiv.Civ.Mech.Eng

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“…The agreements between the predicted and experimental results are remarkable in all examined conditions as shown in figure 4. Further validation was carried out by calculating R, AARE, RMSE, and NMBE [6] to evaluate the reliability and quantitatively measure the predictability of the proposed computational homogenization strategy. These statistical parameters were calculated by:…”

Section: Verification Of the Proposed Computational Homogenization Stmentioning

confidence: 99%

Prediction of tensile deformation behavior of Al-Li alloy 2060-T8 by computational homogenization-based crystal plasticity finite element method

El-Aty

Zhang

et al. 2018

J. Phys.: Conf. Ser.

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and various loading directions. The computational homogenization strategy used a representative volume element (RVE) which describes the real microstructure of AA2060-T8 sheet to consider the in-grains deformation behavior. Besides, a periodically boundary condition was modified to consider both deformation induced anisotropy and the geometrical anisotropy. The initial microstructures and microtextures of the AA2060-T8 sheet were determined by EBSD measurements, as well as used to build up the RVE model. The material parameters used in CP modelling was determined from the stress-strain curve obtained from the tensile test at strain rate of 0.001 s -1 and loading direction of 30̊ with reference to rolling direction. The results obtained from computational homogenisation strategy keep a remarkable agreement with the results determined from experimentation. In conclusion, the computational homogenization based CPFEM is able to predict the deformation behavior and capture the anisotropic response of AA2060-T8 sheet at various deformation conditions.

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Constitutive Model and Processing Maps for a Ti‐55511 Alloy in β Region

et al. 2019

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The flow behavior of a high‐strength Ti alloy (Ti‐55511) in the β region is studied by hot compressive experiments. A dislocation density–based constitutive equation, together with processing maps, is established to describe the flow behavior and hot workability of the studied Ti alloy. It is found that the strain rate (εfalse˙) and temperature (T) distinctly influence the hot compressive deformation behavior. The flow stress increases distinctly with a rising εfalse˙ or reducing T. The main softening mechanism in the β region is dynamic recovery (DRV). The established constitutive equation based on the work hardening (WH) and DRV mechanisms has the desired prediction accuracy, and the correlation coefficient between the predicted and experimental results is 0.9912. The processing maps indicate that a high strain rate (0.4–10 s−1) easily causes unstable deformation, whereas low and medium strain rates (0.001–0.2 s−1) are suitable for hot compressive deformation of the studied alloy.

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Constitutive modeling of flow behavior and microstructure evolution of AA7075 in hot tensile deformation

Cited by 84 publications

References 39 publications

Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

Behaviors and modeling of thermal forming limits of AA7075 aluminum sheet

Prediction of tensile deformation behavior of Al-Li alloy 2060-T8 by computational homogenization-based crystal plasticity finite element method

Constitutive Model and Processing Maps for a Ti‐55511 Alloy in β Region

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