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Research Papers

Transverse Impact Response of a Linear Elastic Ballistic Fiber Yarn

[+] Author and Article Information
Bo Song, Wei-Yang Lu

 Sandia National Laboratories, Livermore, CA 94551

Hwun Park, Weinong Chen

School of Aeronautics and Astronautics,  Purdue University, West Lafayette, IN 47907

J. Appl. Mech 78(5), 051023 (Aug 10, 2011) (9 pages) doi:10.1115/1.4004310 History: Received November 22, 2010; Accepted March 15, 2011; Published August 10, 2011; Online August 10, 2011

Transverse impact response of a linear elastic Kevlar® KM2 fiber yarn was determined at various striking speeds from Hopkinson bar and gas gun experiments incorporated with high-speed photography techniques. Upon transverse impact, a triangle shape was formed in the fiber yarn. Both longitudinal and transverse waves were produced and propagated outwards the fiber yarn. Both the angle of the triangle and Euler transverse wave speed vary with striking speeds. The relationship between the Euler transverse wave speed and the striking speed was determined. The transverse impact response of the fiber yarn was also analyzed with a model, which agrees well with the experimental results. The model shows that the longitudinal wave speed is critical in the ballistic performance of the fiber yarn. At a certain striking speed, a higher longitudinal wave speed produces a higher Euler transverse wave speed, enabling us to spread the load and dissipate the impact energy faster, such that the ballistic performance of the fiber yarn is improved.

Copyright © 2011 by American Society of Mechanical Engineers
Topics: Fibers , Yarns , Waves
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References

Figures

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Figure 1

Schematic of Hopkinson bar setup for transverse impact testing

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Figure 2

Incident and reflected pulses measured with the strain gauges on the pressure bar

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Figure 3

High-speed images of the fiber yarn at the striking speed of 53 m/s

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Figure 4

Deformation of the fiber yarn at the striking speed of 53 m/s

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Figure 5

Particle movements along the fiber yarn

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Figure 6

Particle displacement histories along X direction

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Figure 7

Trace of Lagrangian transverse wave

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Figure 8

Particle displacement histories along Y direction

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Figure 9

The gas gun for high speed transverse impact testing

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Figure 10

The projectile used in gas gun impact testing

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Figure 11

Photograph of the chamber for fiber yarn testing

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Figure 12

High-speed images of the fiber yarn at the striking speed of 241 m/s

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Figure 13

Relationship between Euler transverse wave speed and striking speed

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Figure 14

Modeling the high-speed deformation of the fiber yarn

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Figure 15

Relationship between the strain in the fiber yarn and striking speed

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