Research Papers: Flows in Complex Systems

On the Fluidic Response of Structures in Hypervelocity Impacts

[+] Author and Article Information
Andrew Thurber

Crashworthiness for Aerospace Structures and
Hybrids (CRASH) Lab,
Department of Mechanical Engineering,
Virginia Tech,
Signature Engineering Building,
Blacksburg, VA 24061-0238

Javid Bayandor

Fellow ASME
Crashworthiness for Aerospace Structures and
Hybrids (CRASH) Lab,
Department of Mechanical Engineering,
Virginia Tech,
Signature Engineering Building,
Blacksburg, VA 24061-0238
e-mail: bayandor@vt.edu

1Corresponding author.

Contributed by the Fluids Engineering Division of ASME for publication in the JOURNAL OF FLUIDS ENGINEERING. Manuscript received April 2, 2014; final manuscript received October 12, 2014; published online December 3, 2014. Assoc. Editor: Alfredo Soldati.

J. Fluids Eng 137(4), 041101 (Apr 01, 2015) (8 pages) Paper No: FE-14-1171; doi: 10.1115/1.4028854 History: Received April 02, 2014; Revised October 12, 2014; Online December 03, 2014

In a hypervelocity impact (HVI) event, the shock pressures exceed the strength of common aerospace materials, and brief shock-induced temperature rises cause melting and vaporization of most structural bodies. Under these extreme conditions, the failure and deformation of solids can resemble fluid flow. By using meshless Lagrangian models in an explicit computational framework, this work identifies analogous fluidic interactions and further quantifies the role of shear and inertial forces in HVIs.

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Fig. 1

Initial geometry of projectile and plate (left) and particle approximation of projectile and plate impact zone (right)

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Fig. 2

Simulation and radiograph of 6.64 km/s impact at 6 μs, with true material constants for aluminum on the bottom, strengthless fluid formulation on the top

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Fig. 3

Primary eddy formation in the strengthless formulation (left) versus more random behavior in the solid model (right)

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Fig. 4

Initial configuration (top) and time history of four particles near the center of the aforementioned eddy for the fluidic formulation (center) versus the solid model (bottom)

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Fig. 5

Definition of α, between normal and plume, seen in 500 m/s Al–Al impact

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Fig. 6

α versus V/C0 for HVI and fluid impacts

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Fig. 7

Models of fluid impacts at 25 μs with increasing viscosity: (a) 0.001 Pa·s (water), (b) 1 Pa·s, (c) 10 Pa·s, and (d) 100 Pa·s

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Fig. 8

Viscous metal formulation (top) compared to experimental radiograph (bottom) of 6.64 km/s impact at 6 μs

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Fig. 9

Comparison of kinetic (top) and internal (center) energy in Mbar cm3 transferred from impactor to plate between the strengthless, viscous, and solid formulations, along with percent error from solid (bottom)

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Fig. 10

The volume used for convergence analysis, encompassing multiple particles under high deformation



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