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Novel specimen for the effective measurement of the fracture strain along with stress triaxiality and Lode parameter

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Abstract

A double notched central hole, i.e., DNC specimen, which contains a center hole with a left side notch and a right side notch accompanying the slope α, is proposed to simultaneously achieve dual values of stress triaxiality and Lode parameter from one specimen in the present study. Analytical and numerical approaches are carried out under decent assumptions to characterize the plane strain behavior of DNC specimen along with the slope α. Quasi-static tensile tests with conventional specimens and DNC specimens revealed plastic strains at fracture for each specimen case in accordance with stress triaxiality and Lode parameter by digital image correlation. It is found that one DNC specimen successfully provides dual values of stress triaxiality and Lode parameter at the same time; therefore, it saves up to 50 % of experimental time and labor of conventional specimens.

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Acknowledgments

This work was supported by the research grant of the Kongju National University in 2017.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Kongju National University, Cheonan, 31080, Korea

    Seok Woo Ham, Jae Ung Cho & Seong S. Cheon

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  1. Seok Woo Ham
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  2. Jae Ung Cho
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  3. Seong S. Cheon
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Corresponding author

Correspondence to Seong S. Cheon.

Additional information

Seok Woo Ham is a Ph.D. student of the Department of Mechanical Engineering, Kongju National University, Cheonan, Korea. His research interests include crashworthiness of automotive, fracture mechanics and application of composite materials.

Jae Ung Cho received his M.S. and Ph.D. in Mechanical Engineering from Inha University, Incheon, Korea, in 1982 and 1986, respectively. Currently, he is a Professor in the Department of Mechanical Engineering at Kongju National University, Korea. He is interested in the areas of fracture mechanics (dynamic impact), composite material, fatigue and strength evaluation, and so on.

Seong S. Cheon received his M.S. and Ph.D. in Mechanical Engineering at KAIST in 1995 and 1999, respectively. He is currently a Professor in the Department of Mechanical Engineering at Kongju National University, Korea. His research interests include crashworthiness of joining parts, mechanical behavior of foams and application of composite materials.

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Ham, S.W., Cho, J.U. & Cheon, S.S. Novel specimen for the effective measurement of the fracture strain along with stress triaxiality and Lode parameter. J Mech Sci Technol 35, 3847–3854 (2021). https://doi.org/10.1007/s12206-021-2108-5

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  • DOI: https://doi.org/10.1007/s12206-021-2108-5

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