Abstract
The present study experimentally investigates the shock wave attenuation performance of various sandwiched structures made up of different polymer foams (expanded polystyrene and polyurethane foam) with and without shear thickening fluid (STF). STF is a non-Newtonian fluid whose viscosity increases with increase in shear rate due to the formation of hydro clusters produced by the increased hydrodynamic forces acting between the interstitial spaces. Two layers of polymer foams have been considered for the shock protective material and the space between the layers is filled with shear thickening fluid. The shock wave is experimentally generated from a shock tube facility and is allowed to impinge on a target plate kept at 10 mm downstream to the shock tube end. It is seen that the protective material with polyurethane foam and shear thickening fluid (polyethylene glycol+silica nanoparticles) reduces the shock overpressure by nearly 35.51 %, whereas the protective material with only polyurethane foam (with the same thickness) reduces the shock overpressure by only 13.17 %. Similarly, the protective material with expanded polystyrene and shear thickening fluid reduces the shock overpressure by nearly 32.16 %, whereas the protective material with only expanded polystyrene (with the same thickness) reduces the shock overpressure by only 10.49 %. Hence, it is evident that the shear thickening fluid between the polymer foam layers greatly helps in shock wave attenuation.
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Abbreviations
- ACH :
-
Advance combat helmet
- bTBI :
-
Blast-induced traumatic brain injury
- CFD :
-
Computational flow dynamics
- PEG :
-
Polyethylene glycol
- STF :
-
Shear thickening fluid
- UD :
-
Unidirectional
- UHMWP :
-
Ultra-high molecular weight polyethylene
- P1 :
-
Pressure at driver section
- P2 :
-
Pressure at driven section
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Acknowledgements
This research project is funded by the INSPIRE research grant (IFA-18-ENG-251) from the Department of Science and Technology (DST), India.
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Arun Kumar R is working as an Assistant Professor at the Department of Mechanical Engineering, Indian Institute of Technology Jodhpur (IITJ), India. He received his Ph.D. from Indian Institute of Technology Madras (IITM), India. His research interests include shock wave reflections, blast wave attenuation, highspeed internal and external flows, experimental aerodynamics.
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Singh, K., Raj, R., Rajagopal, A.K. et al. Shock wave attenuation using sandwiched structures made up of polymer foams and shear thickening fluid. J Mech Sci Technol 37, 1311–1316 (2023). https://doi.org/10.1007/s12206-023-0217-z
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DOI: https://doi.org/10.1007/s12206-023-0217-z