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Parameter Calibration of GTN Damage Model and Formability Analysis of 22MnB5 in Hot Forming Process

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Abstract

Hot forming of high strength steel at elevated temperatures is an attractive technology to achieve the lightweight of vehicle body. The mechanical behavior of boron steel 22MnB5 strongly depends on the variation of temperature which makes the process design more difficult. In this paper, the Gurson–Tvergaard–Needleman (GTN) model is used to study the formability of 22MnB5 sheet at different temperatures. Firstly, the rheological behavior of 22MnB5 is analyzed through a series of hot tensile tests at a temperature range of 600-800 °C. Then, a detailed process to calibrate the damage parameters is given based on the response surface methodology and genetic algorithm method. The GTN model together with the damage parameters calibrated is then implemented to simulate the deformation and damage evolution of 22MnB5 in the process of high-temperature Nakazima test. The capability of the GTN model as a suitable tool to evaluate the sheet formability is confirmed by comparing experimental and calculated results. Finally, as a practical application, the forming limit diagram of 22MnB5 at 700 °C is constructed using the Nakazima simulation and Marciniak–Kuczynski (M–K) model, respectively. And the simulation integrated GTN model shows a higher reliability by comparing the predicted results of these two approaches with the experimental ones.

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Acknowledgments

This research is financially supported by National Natural Science Foundation of China (51705065) and Fundamental Research Funds for the Central University (DUT16RC(4)28, DUT17JC38).

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Authors and Affiliations

  1. School of Automotive Engineering, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Liang Ying, Dantong Wang & Ping Hu

  2. Department of Engineering Mechanics, Faculty of Vehicle Engineering and Mechanics, State Key Laboratory of Structural Analysis for Industrial Equipment, Dalian University of Technology, Dalian, 116024, People’s Republic of China

    Wenquan Liu

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  1. Liang Ying
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Correspondence to Wenquan Liu.

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Ying, L., Liu, W., Wang, D. et al. Parameter Calibration of GTN Damage Model and Formability Analysis of 22MnB5 in Hot Forming Process. J. of Materi Eng and Perform 26, 5155–5165 (2017). https://doi.org/10.1007/s11665-017-2962-6

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  • DOI: https://doi.org/10.1007/s11665-017-2962-6

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