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Balanced Biaxial Testing of Advanced High Strength Steels in Warm Conditions

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Abstract

The main purpose of the present work is to measure the stress–strain behavior under warm conditions (about 100 °C) of advanced high strength steel (AHSS) sheets up to large strains compared to uniaxial tension. The test equipment consists of two main parts, i.e., a hydraulic bulge tester and a heating device. A mechanical system is attached to the test equipment for measuring the membrane stress and thickness strain at the bulge pole. The stress–strain curves were measured for three kinds of AHSS sheets with the proposed test method for various initial temperatures (10, 50 and 100 °C). The proposed method does not provide isothermal stress–strain curves because the specimen temperature increases during the test due to the effect of deformation-induced heating. A numerical scheme using thermo-mechanical finite element (FE) simulations is suggested to deconvolute the isothermal stress–strain curves.

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Acknowledgments

This research was supported by POSCO. Myoung-Gyu Lee appreciates the supports by the grants from the Industrial Source Technology Development Program (#10040078) of MKE and by the NRF Grant funded by MEST (NRF-2012R1A5A1048294). Mr. Hyun-Ho Bok and Mr. Hyuk-Jong Bong from the Materials Mechanics Laboratory, GIFT, POSTECH are gratefully acknowledged for their supports in conducting experiments.

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Authors and Affiliations

  1. Graduate Institute of Ferrous Technology (GIFT), Pohang University of Science and Technology (POSTECH), San 31 Hyoja-dong, Nam-gu, Pohang, Gyeongbuk, 790-784, Republic of Korea

    J.-Y. Lee, L. Xu, F. Barlat & M.-G. Lee

  2. Department of Materials Science and Engineering, The Ohio State University, 2041 College Road, Columbus, OH, 43210, USA

    R. H. Wagoner

Authors
  1. J.-Y. Lee
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  2. L. Xu
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  3. F. Barlat
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  4. R. H. Wagoner
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  5. M.-G. Lee
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Correspondence to M.-G. Lee.

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Lee, JY., Xu, L., Barlat, F. et al. Balanced Biaxial Testing of Advanced High Strength Steels in Warm Conditions. Exp Mech 53, 1681–1692 (2013). https://doi.org/10.1007/s11340-013-9758-x

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  • DOI: https://doi.org/10.1007/s11340-013-9758-x

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