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Fracture limit analysis of DP590 steel using single point incremental forming: experimental approach, theoretical modeling and microstructural evolution

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Abstract

The single point incremental forming (SPIF) process is gaining special attention in the aerospace, biomedical and manufacturing industries for making intricate asymmetric components. In the present study, SPIF process has been performed for forming varied wall angle conical and pyramidal frustums using DP590 steel. Initially, the conventional stretch forming process has been performed for finding the fracture forming limit diagram (FFLD). Further, it has been validated with the limiting strains found using SPIF process. The conical and pyramidal frustums deformed near to the plane strain and biaxial region, respectively. The theoretical FFLD has been predicted using seven different ductile damage models. The effect of sheet anisotropy while predicting the fracture strains has been included using Hill 1948 and Barlat 1989 yielding functions. Among the used damage models, the Bao-Wierzbicki (BW) model along with Barlat 1989 yield criterion displayed the least error of 2.92% while predicting the fracture locus. The stress triaxiality in the different forming region has been thoroughly investigated and it has been found that the higher triaxiality value reveals high rate of accumulated damage which lead to early failure of the material in the respective region. The stress triaxiality and effective fracture strains have also been found to be significantly affected by the anisotropy. The micro-textural studies have also been performed and it has been found that the increase in local misorientations and shift in the textural components from γ-fiber to ε-fiber in the corner region of the frustums worked towards limiting the formability of material and ultimately leading towards the fracture of frustums.

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Acknowledgements

The authors are thankful for the services provided by the mechanical workshop and materials testing lab of BITS-Pilani, Hyderabad Campus, India.

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  1. Sandeep Pandre and Ayush Morchhale contributed equally to this work.

Authors and Affiliations

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

    Sandeep Pandre, Ayush Morchhale, Gauri Mahalle, Nitin Kotkunde & Kurra Suresh

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

    Swadesh Kumar Singh

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  1. Sandeep Pandre
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Correspondence to Nitin Kotkunde.

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Pandre, S., Morchhale, A., Mahalle, G. et al. Fracture limit analysis of DP590 steel using single point incremental forming: experimental approach, theoretical modeling and microstructural evolution. Archiv.Civ.Mech.Eng 21, 95 (2021). https://doi.org/10.1007/s43452-021-00243-1

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