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Determination of Strain Rate Sensitivity of Micro-struts Manufactured Using the Selective Laser Melting Method

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Abstract

Micro-lattice structures manufactured using the selective laser melting (SLM) process provides the opportunity to realize optimal cellular materials for impact energy absorption. In this paper, strain rate-dependent material properties are measured for stainless steel 316L SLM micro-lattice struts in the strain rate range of 10−3 to 6000 s−1. At high strain rates, a novel version of the split Hopkinson Bar has been developed. Strain rate-dependent materials data have been used in Cowper–Symonds material model, and the scope and limit of this model in the context of SLM struts have been discussed. Strain rate material data and the Cowper–Symonds model have been applied to the finite element analysis of a micro-lattice block subjected to drop weight impact loading. The model output has been compared to experimental results, and it has been shown that the increase in crush stress due to impact loading is mainly the result of strain rate material behavior. Hence, a systematic methodology has been developed to investigate the impact energy absorption of a micro-lattice structure manufactured using additive layer manufacture (SLM). This methodology can be extended to other micro-lattice materials and configurations, and to other impact conditions.

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Acknowledgments

Access to the Selective Laser Melting machine was provided by Prof. Chris Sutcliffe, from the University of Liverpool. The visit of R. Gümrük to the University of Liverpool was supported by the Council of Higher Education of Turkey.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Karadeniz Technical University, 61080, Trabzon, Turkey

    Recep Gümrük

  2. School of Engineering, University of Liverpool, Liverpool, L69 3GH, UK

    R. A. W. Mines

  3. Department of Mechanical Engineering, University of Başkent, Ankara, Turkey

    Sami Karadeniz

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  1. Recep Gümrük
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  3. Sami Karadeniz
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Correspondence to Recep Gümrük.

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Gümrük, R., Mines, R.A.W. & Karadeniz, S. Determination of Strain Rate Sensitivity of Micro-struts Manufactured Using the Selective Laser Melting Method. J. of Materi Eng and Perform 27, 1016–1032 (2018). https://doi.org/10.1007/s11665-018-3208-y

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  • DOI: https://doi.org/10.1007/s11665-018-3208-y

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