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Experimental and theoretical investigation of forming limit diagram for Ti-6Al-4 V alloy at warm condition

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Abstract

Forming limit diagram (FLD) is an important performance index to describe the maximum limit of principal strains that can be sustained by sheet metals till to the onset of localized necking. It is useful tool to access the forming severity of a drawing or stamping processes. In the present work, FLD has been determined experimentally for Ti-6Al-4 V alloy at 400 °C by conducting a hemispherical dome test with specimens of different widths. Additionally, theoretical FLDs have been determined using Marciniak Kuczynski (M-K) model. Various yield criteria namely: Von Mises, Hill 1948, Hill 1993 and Cazacu Barlat in combination with different hardening models viz., Hollomon power law (HPL), Johnson-Cook (JC), modified Johnson-Cook (m-JC), modified Arrhenius (m-Arr.), modified Zerilli–Armstrong (m-ZA) have been used in M-K analysis for theoretical FLD prediction. The material properties required for determination of yield criteria and hardening models constants have been calculated using uniaxial tensile tests. The predicted theoretical FLDs results are compared with experimental FLD. It can be observed that influence of yield criterion in M-K analysis for theoretical FLD prediction is predominant than the hardening model. Based on the results; it is observed that the theoretical FLD using Cazacu Barlat and Hill 1993 yield criteria with m-Arr. hardening model has a very good agreement with experimental FLD.

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Acknowledgments

The financial support received for this research work from Department of Science and Technology (DST), Government of India, SERB-DST, SR/FTP/ETA-0056/2011 is gratefully acknowledged.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Hyderabad Campus, BITS-Pilani, Hyderabad, Telangana, 500078, India

    Nitin Kotkunde, Geetha Krishna, Shyam Krishna Shenoy & Amit Kumar Gupta

  2. Department of Mechanical Engineering, GRIET, Hyderabad, Telangana, 500072, India

    Swadesh Kumar Singh

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  1. Nitin Kotkunde
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  2. Geetha Krishna
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  4. Amit Kumar Gupta
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Correspondence to Nitin Kotkunde.

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Kotkunde, N., Krishna, G., Shenoy, S.K. et al. Experimental and theoretical investigation of forming limit diagram for Ti-6Al-4 V alloy at warm condition. Int J Mater Form 10, 255–266 (2017). https://doi.org/10.1007/s12289-015-1274-3

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