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Incident Strain Pulse Sensitivity in Split Hopkinson Pressure Bar Testing Setup for Variable Conditions: A Numerical and Statistical Approach

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Abstract

The dynamic behaviour of different materials has been widely studied using the split Hopkinson pressure bar (SHPB) testing. The striker bar's velocity (SV) and the incident bar's impact surface are well known to have a significant impact on producing a clear signal in the compressive SHPB studies. Several times, the shape of the incident strain signal differs from an ideal state, and the reason is difficult to find. In this paper, a parametric investigation of such understudied instances is carried out utilising Abaqus software for finite element analysis (FEA). The numerically obtained incident strain pulse for a perfectly aligned SHPB setup with different SV was validated experimentally on compressive SHPB apparatus. The numerical output was found to have good agreement with experimental results. Further, plots of incident strain were evaluated numerically for Sv (10, 15, 20, 25 and 30 in m/s) which was used for polynomial fitting using MATLAB's curve fitting tool. A similar method was adopted for symmetrically plane non-parallel impact surface on the incident bar. The angles chosen for FEA calculations were 5°, 10°, 15° and 20°. Filleted impact surface with radius (r) 1.5, 3, 4.5 and 6 mm was also studied. The study of the variation of impact surface shape was done at a striker velocity of 25 m/s. It was observed from this study that when striker velocity increases, the absolute magnitude of incident strain at peak increases while rise time remained constant. In turn, when the symmetrically non-parallel plane surface angle and fillet radius grow, the absolute value of incident strain at peak almost stays the same but the rising time lengthens. This study can help understand the nature and discrepancy of the incident strain signal obtained in the compressive SHPB setup and find its root cause.

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Acknowledgments

The authors are obliged to the National Institute of Technology Rourkela, India, and the Indian Institute of Technology Bombay, India, for providing infrastructural backing for this study. The guidance provided by Prof. Chandra Sekher Yerramalli is deeply acknowledged. Mr. Chinmay Sumant and Mr. Rajesh Patnaik's technical support was also very much appreciated.

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  1. FRP Composite Laboratory, Department of Metallurgical and Materials Engineering, National Institute of Technology, Rourkela, 769008, India

    Shubham, Rajesh Kumar Prusty & Bankim Chandra Ray

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Shubham, Prusty, R.K. & Ray, B.C. Incident Strain Pulse Sensitivity in Split Hopkinson Pressure Bar Testing Setup for Variable Conditions: A Numerical and Statistical Approach. J. of Materi Eng and Perform 33, 463–474 (2024). https://doi.org/10.1007/s11665-023-07963-w

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