Blast waves generated in the field explosions impinge on the head-brain complex and induce mechanical pressure pulses in the brain resulting in traumatic brain injury. Severity of the brain injury (mild to moderate to severe) is dependent upon the magnitude and duration of the pressure pulse, which in turn depends on the intensity and duration of the oncoming blast wave. A fluid-filled cylinder is idealized to represent the head-brain complex in its simplest form; the cylinder is experimentally subjected to an air blast of Friedlander type, and the temporal variations of cylinder surface pressures and strains and fluid pressures are measured. Based on these measured data and results from computational simulations, the mechanical loading pathways from the external blast to the pressure field in the fluid are identified; it is hypothesized that the net loading at a given material point in the fluid comprises direct transmissive loads and deflection-induced indirect loads. Parametric studies show that the acoustic impedance mismatches between the cylinder and the contained fluid as well as the flexural rigidity of the cylinder determine the shape/intensity of pressure pulses in the fluid.
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June 2013
Research-Article
Blast Wave Loading Pathways in Heterogeneous Material Systems–Experimental and Numerical Approaches
Veera Selvan,
Veera Selvan
Graduate Research Assistant
e-mail: veera_1431@yahoo.co.in
e-mail: veera_1431@yahoo.co.in
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Shailesh Ganpule,
Shailesh Ganpule
Graduate Research Assistant
e-mail: shailesh@huskers.unl.edu
e-mail: shailesh@huskers.unl.edu
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Nick Kleinschmit,
Nick Kleinschmit
Graduate Research Assistant
e-mail: n_kleinschmit@yahoo.com
e-mail: n_kleinschmit@yahoo.com
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Namas Chandra
Namas Chandra
1
Professor
Fellow, ASME
e-mail: nchandra2@unl.edu
Department of Mechanical and Materials Engineering,
Fellow, ASME
e-mail: nchandra2@unl.edu
Department of Mechanical and Materials Engineering,
University of Nebraska-Lincoln
,Lincoln, NE 68588-0656
1Corresponding author.
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Veera Selvan
Graduate Research Assistant
e-mail: veera_1431@yahoo.co.in
e-mail: veera_1431@yahoo.co.in
Shailesh Ganpule
Graduate Research Assistant
e-mail: shailesh@huskers.unl.edu
e-mail: shailesh@huskers.unl.edu
Nick Kleinschmit
Graduate Research Assistant
e-mail: n_kleinschmit@yahoo.com
e-mail: n_kleinschmit@yahoo.com
Namas Chandra
Professor
Fellow, ASME
e-mail: nchandra2@unl.edu
Department of Mechanical and Materials Engineering,
Fellow, ASME
e-mail: nchandra2@unl.edu
Department of Mechanical and Materials Engineering,
University of Nebraska-Lincoln
,Lincoln, NE 68588-0656
1Corresponding author.
Contributed by the Bioengineering Division of ASME for publication in the JOURNAL OF BIOMECHANICAL ENGINEERING. Manuscript received May 19, 2012; final manuscript received March 16, 2013; accepted manuscript posted April 4, 2013; published online May 9, 2013. Assoc. Editor: Fotis Sotiropoulos.
J Biomech Eng. Jun 2013, 135(6): 061002 (14 pages)
Published Online: May 9, 2013
Article history
Received:
May 19, 2012
Revision Received:
March 16, 2013
Accepted:
April 4, 2013
Citation
Selvan, V., Ganpule, S., Kleinschmit, N., and Chandra, N. (May 9, 2013). "Blast Wave Loading Pathways in Heterogeneous Material Systems–Experimental and Numerical Approaches." ASME. J Biomech Eng. June 2013; 135(6): 061002. https://doi.org/10.1115/1.4024132
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