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Damage and failure characterization of 7075 aluminum alloy hot stamping

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Abstract

7000 series high strength aluminum alloys are increasingly used in manufacturing automobile body parts to meet the more stringent demands for automobile lightweight. Hot stamping of 7000 series high strength aluminum alloys is a complex thermal-mechanical coupling process and precise simulation is needed to predict material fracture. To obtain damage model of 7075 aluminum alloy in hot stamping, five different stress triaxiality specimens were designed. The fracture strain, critical strain and average stress triaxiality of different specimens were obtained by the hybrid finite element simulation and experiment (FE-EXP) method. GISSMO model of 7075 aluminum alloy at 400 °C was established. Compared with the experimental results of U-shaped part hot stamping under different lubrication conditions, the calibrated GISSMO model was demonstrated to predict the damage behavior of 7075 aluminum alloy during high temperature deformation accurately.

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Abbreviations

D :

Damage parameter

ΔD :

Damage parameter increment

ε f(n) :

The failure plastic strain is a function of the triaxiality

Δε pl :

Equivalent plastic strain increment

n :

Damage exponent

ε f :

Failure plastic strain under different stress states

η :

Triaxiality

F :

Instability parameter

ΔF :

Instability parameter increment

ε crit :

Critical plastic strain under different stress triaxialities

σ*:

Stress couple damage and without damage

D crit :

Threshold damage

m :

Fading exponent

σ :

The current flow stress

ε :

The current plastic strain

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Acknowledgments

This work was supported by “13th five-year” Scientific Research Planning Project of the Education Department of Jilin Province, China (JJKH20180128KJ).

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Authors and Affiliations

  1. Key Laboratory of Automobile Materials, Ministry of Education, and School of Material Science and Engineering, Jilin University, Changchun, China

    Zhiqiang Zhang & Yuejie Cui

  2. Roll Forging Research Institute, Jilin University, Changchun, China

    Qingmin Chen

Authors
  1. Zhiqiang Zhang
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  2. Yuejie Cui
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  3. Qingmin Chen
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Corresponding author

Correspondence to Qingmin Chen.

Additional information

Qingmin Chen is a Senior Engineer of Roll Forging Research Institute, Jilin University, Changchun, China. His research interests include roll forming, roll forging forming and automation of forging equipment.

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Zhang, Z., Cui, Y. & Chen, Q. Damage and failure characterization of 7075 aluminum alloy hot stamping. J Mech Sci Technol 36, 351–357 (2022). https://doi.org/10.1007/s12206-021-1234-4

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  • DOI: https://doi.org/10.1007/s12206-021-1234-4

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