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Fracture criterion for AZ31 Mg alloy plate at elevated temperature

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Abstract

The fracture criterion was characterized for an AZ31 Mg alloy plate with the 3.0 mm thickness at the elevated temperature of 250 °C in this work. In order to properly characterize the fracture criterion, its mechanical properties were also characterized. As for mechanical properties, simple tension tests were performed to calibrate the Hill1948 yield function. Also, in order to account for the hardening deterioration (softening) behavior beyond the uniform deformation limit, the flow curves of the Mg alloy plate were numerically obtained based on the inverse calibration method, in which strain rate sensitivity was also considered. As for the fracture criterion, effective fracture strains, which are dependent on stress triaxiality and deformation paths, were numerically characterized utilizing experimental data based on specimens with four different shapes newly developed. For comparison purposes, empirical fracture criteria such as the Cockcroft-Latham, Brozzo, Ayada and Clift models were also calibrated. For validation purposes, the five fracture criteria were applied for a real part (an EL-cover) drawing case and the result confirmed that the fracture criterion developed in this work performed best among the five models tried out.

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Research Institute of Advanced Materials, Engineering Research Institute, Seoul National University, Daehak-dong, Gwanak-gu, Seoul, 151-744, Korea

    Dong-Yoon Seok, Jeonghwan Bak & Kwansoo Chung

  2. Materials Deformation Department, Korea Institute of Materials Science, 797 Changwondaero, Changwon, Gyeongnam, 642-831, Korea

    Daeyong Kim, Sang-Woo Kim & Young-Seon Lee

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  1. Dong-Yoon Seok
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  2. Daeyong Kim
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  3. Sang-Woo Kim
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  4. Jeonghwan Bak
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  5. Young-Seon Lee
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  6. Kwansoo Chung
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Correspondence to Kwansoo Chung.

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Seok, DY., Kim, D., Kim, SW. et al. Fracture criterion for AZ31 Mg alloy plate at elevated temperature. Met. Mater. Int. 21, 54–71 (2015). https://doi.org/10.1007/s12540-015-1007-7

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  • DOI: https://doi.org/10.1007/s12540-015-1007-7

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