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High ductile fracture of a low-yield-strength steel with a part-through curve crack

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Abstract

Low-yield-strength (LYS) steels possess ultra-high ductility and low yield ratio which indicates a wide prospect of the application for energy absorption. When a LYS steel-based damper or buffer is activated by a seismic wave or a crash impact, the structural integrity usually has a high risk of failure. Hence, the fracture resistance of LYS steels should be a key parameter for their structural design and integrity assessment. Here, we report both an experimental and a numerical investigation on the fracture behavior of an LYS steel with the yield stress of 100 MPa (LYS100), where a part-through corner or surface crack is machined in specimens and the critical loading capacities of the specimens are determined by our experiments. The suitable material parameters of the extended finite element method for LYS100 are determined based on our experimental results, which can be used to describe the fracture behavior of LYS100. Our results show that the fracture toughness of LYS100 can be up to around 1019 N/mm, which is almost twice as high as that of Q235 and one order bigger than that of gray cast iron. These findings will be a great help toward understanding the fracture properties of LYS steels and designing high-performance damping structures.

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Acknowledgements

The authors gratefully acknowledge the financial support by the National Natural Science Foundation of China (Grant Nos. 11302067, 11572140 and 11302084), the Natural Science Foundation of Jiangsu Province (Grant No. BK20180031), the 111 Project (Grant No. B18027), the Fundamental Research Funds for the Central Universities (Grant No. JUSRP115A09), the Programs of Innovation and Entrepreneurship of Jiangsu Province, Primary Research & Development Plan of Jiangsu Province (Grant No. BE2017069), Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology (Grant No. FMZ201806), Science and Technology Plan Project of Wuxi, Postgraduate Research & Practice Innovation Program of Jiangsu Province (Grant No. KYCX17_1473), the Undergraduate Innovation Training Program of Jiangnan University of China (Grant No. 2015151Y), the Undergraduate Innovation and Entrepreneurship Training Program of China (201610295057), the Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures (NUAA) (Grant No. MCMS-0416G01), Project of Jiangsu provincial Six Talent Peaks in Jiangsu Province and Thousand Youth Talents Plan.

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Authors and Affiliations

  1. Jiangsu Key Laboratory of Advanced Food Manufacturing Equipment and Technology, School of Mechanical Engineering, Jiangnan University, Wuxi, 214122, China

    Peishi Yu, Jiawang Sun, Chaofeng Zhang & Junhua Zhao

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  1. Peishi Yu
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  2. Jiawang Sun
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  3. Chaofeng Zhang
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  4. Junhua Zhao
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Correspondence to Junhua Zhao.

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Yu, P., Sun, J., Zhang, C. et al. High ductile fracture of a low-yield-strength steel with a part-through curve crack. Acta Mech 230, 319–331 (2019). https://doi.org/10.1007/s00707-018-2312-2

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  • DOI: https://doi.org/10.1007/s00707-018-2312-2

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