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Damaged and failure characterization of 7075-T6 Al alloy based on GISSMO model

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Abstract

Failure simulation of 7075-T6 Al alloy is very important due to its relatively low ductility compared to conventional steel. A hybrid numerical-experimental method was developed to determine plastic strains at fracture as a function of triaxiality. The uniaxial tension tests were performed by using the specimens including pure shear, 45° shear, smooth, R5 notch and R15 notch. The fracture locus was established by calibrating the parameters of the Hosford-Coulomb fracture model and was implemented into the GISSMO damage model. The results showed that the predicted force-displacement data were in good agreement with the experimental results. The results of the mesh dependence showed that the mesh size in the range of 0.5–5 mm did not have much influence on the damage results. To assess the accuracy of the damage model, three-point bending tests of the anti-collision beam were performed. The calibrated GISSMO damage model could accurately predict the load-displacement data.

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Abbreviations

D :

Damage parameter

ΔD :

Damage parameter increment

ε f (η):

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

f j (θ):

Lode angle parameter θ dependent trigonometric functions. i = 1,2,3

θ :

The lode angle parameter

θ :

The lode angle

σ :

The current flow stress

σ u :

The maximum flow stress

ε :

The current plastic strain

ε u :

The plastic strain at the maximum flow stress

q :

The weighting factor

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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. Key Laboratory of Automobile Materials, Ministry of Education, and Roll Forging Research Institute, Jilin University, Changchun, China

    Ge Yu

Authors
  1. Zhiqiang Zhang
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  2. Yuejie Cui
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  3. Ge Yu
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Corresponding author

Correspondence to Ge Yu.

Additional information

Recommended by Editor Hyung Wook Park

Ge Yu is a Lecturer of the Roll Forging Institute, Jilin University, Jilin Province, China. She received her Ph.D. in College of Materials Science and Engineering, Jilin University. Her research interests include metal forming and damage failure simulation.

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Zhang, Z., Cui, Y. & Yu, G. Damaged and failure characterization of 7075-T6 Al alloy based on GISSMO model. J Mech Sci Technol 35, 1209–1214 (2021). https://doi.org/10.1007/s12206-021-0234-8

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  • DOI: https://doi.org/10.1007/s12206-021-0234-8

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