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Material Characterization of 550D Reinforcing Steel Bar at High Strain Rates

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Abstract

Reinforcing steel bars play a crucial role in reinforced concrete constructions. To comprehend the behavior of reinforced concrete structures under extreme conditions like impact and blast, it is imperative to investigate the influence of strain rate on reinforcing steel bars. This study aims to investigate the performance of 550D reinforcing steel bars with diameters of 8 and 10 mm under high-strain-rate loading conditions. The experiments were conducted using a Split Hopkinson Pressure Bar setup to analyze the tensile and compressive behavior of the reinforcing steel bars at high strain rates. Precise calibration of both compressive and tensile Split Hopkinson Pressure Bars was carried out to ensure the dynamic equilibrium of the propagating waves within the specimen. Specimens featuring a 3 mm gauge diameter were utilized for dynamic tension, whereas specimens with l/d ratios of 0.5 and 1.0 were employed for dynamic compression at various strain rates. Stress–strain curves for the reinforcing steel bars were plotted at different strain rates, and the strain rate sensitivity was analyzed. High-speed photography was used to examine the deformation of samples under compression at high strain rates. It was observed that the percentage of elongation was higher for l/d 0.5 compared to l/d 1.0 at nearly the same strain rate. The research further assessed the Cowper–Symonds and Johnson–Cook constitutive models for tension and compression at high strain rates, providing an accurate prediction of the true stress–strain relationship. The derived strain rate parameters indicated that both 8- and 10-mm reinforcing steel bars exhibited similar behavior under dynamic tension. However, the 10-mm reinforcing steel under dynamic compression demonstrated higher values than the 8-mm reinforcing steel. These findings offer potential applications in exploring the dynamic characteristics of similar reinforcing steels and their corresponding structural components in future investigations.

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Acknowledgments

The authors gratefully acknowledge the experimental facility provided by the Indian Institute of Technology Roorkee, India, and the financial assistance provided by the Atomic Energy Regulatory Board (AERB), Government of India.

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  1. Indian Institute of Technology Roorkee, Roorkee, 247667, India

    Ajay Kumar & M. A. Iqbal

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  1. Ajay Kumar
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Kumar, A., Iqbal, M.A. Material Characterization of 550D Reinforcing Steel Bar at High Strain Rates. J. of Materi Eng and Perform (2024). https://doi.org/10.1007/s11665-024-09615-z

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