Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Factors Contributing to Increased Blast Overpressure inside Modern Ballistic Helmets

Version 1 : Received: 18 September 2020 / Approved: 20 September 2020 / Online: 20 September 2020 (14:21:02 CEST)

A peer-reviewed article of this Preprint also exists.

Skotak, M.; Salib, J.; Misistia, A.; Cardenas, A.; Alay, E.; Chandra, N.; Kamimori, G.H. Factors Contributing to Increased Blast Overpressure Inside Modern Ballistic Helmets. Appl. Sci. 2020, 10, 7193. Skotak, M.; Salib, J.; Misistia, A.; Cardenas, A.; Alay, E.; Chandra, N.; Kamimori, G.H. Factors Contributing to Increased Blast Overpressure Inside Modern Ballistic Helmets. Appl. Sci. 2020, 10, 7193.

Journal reference: Appl. Sci. 2020, 10, 7193
DOI: 10.3390/app10207193

Abstract

This study demonstrates the orientation and the ‘shape factor’ have pronounced effects on the development of the localized pressure fields inside of the helmet. We used anatomically accurate headform to evaluate four modern combat helmets under blast loading conditions in the shock tube. The Advanced Combat Helmet (ACH) is used to capture the effect of the orientation on pressure under the helmet. The three modern combat helmets: ECH, Ops-Core, and Airframe, were tested in frontal orientation to determine the effect of helmet geometry. Using the unhelmeted headform data as a reference, we characterized pressure distribution inside each helmet and identified pressure focal points. The nature of these localized “hot spots” is different than the elevated pressure in the parietal region of the headform under the helmet widely recognized as the under-wash effect also observed in our tests. It is the first experimental study which indicates that the helmet presence increased the pressure experienced by the eyes (as evidenced by the pressure sensors in the H8 and H9 locations), and the forehead (denoted as H1 location). Pressure fingerprinting using an array of sensors combined with the application of principle component analysis (PCA) helped elucidate the subtle differences between helmets.

Subject Areas

helmet; blast overpressure; shock wave; peak overpressure; impulse; shock tube

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