Photographic Investigation of High-Speed Missile Impact upon Nylon Fabric

Abstract

Single layers of nylon fabric have been subjected to high-speed missile impact at velocities ranging from 116 to 537 m/sec. The transient responses of the fabric and missile have been observed by high-speed photography. The photo graphs have shown that fabric deformation was pyramidal before penetration and more conical after penetration. The photographs have permitted measurements of the missile exit velocity from the fabric, the missile energy loss due to interaction with the fabric, the time required to penetrate the fabric, and the size and growth rate of the resultant fabric deformation cones. These results, together with a simplified mechanical model, have indicated that the broken orthogonal yarns within the deformation cone could account for 50 100% of the observed missile energy loss. In addition, during penetration of the fabric, the measured average cone-radial velocities in the fabric ranged from 50 to 80% of the values derived from fiber impact theory.

Keywords

Nylon fabric. Missile impact broken orthogonal yarns. High-speed photography. Transient response interaction time fabric deformation cone cone radial velocity transverse wave velocity. Missile energy loss energy partition fabric strain energy yarn breaking energy fabric kinetic energy energy transfer termination. Fiber impact theory.

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References

Lyons, W.J. , Impact Phenomena in Textiles, Cambridge, Mass., M. I. T. Press, 1963, p. 159.

Petterson, D.R. , Stewart, G.M. , Odell, F.A. , aqd Maheux, R.C. , Dynamic Distribution of Strain in Textile Materials Under High-Speed Impact. Part I: Experimental Methods and Preliminary Results on Single Yarns, Textile Res. J. 30, 411 - 421 ( 1960).

Roylance, D. , Wilde, A. , and Tocci, G. , Ballistic Impact of Textile Structures, Textile Res. J. 43, 34 41 ( 1973).

Smith, J.C. , Fenstermaker, C.A. , and Shouse, P.J. , Stress-Strain Relationships in Yarns Subjected to Rapid Impact Loading. Part X: Stress-Strain Curves Obtained by Impacts with Rifle Bullets, Textile Res. J. 33, 919-934 (1963).

Wilde, A.F. , Ricca, J.J. , Rogers, J.M. , and Cole, L.M. , Breaking Energies of a Nylon Series Subjected to High-Speed Transverse Impact , Polymer Eng. Sci. 12, 41-47 (1972).

Wilde, A.F. , Ricca, J.J. , Roylance, D.K. , Tocci, G.C. , and Rogers, J.M. , Deformation and Rupture of Fibers and, Films Under Missile Impact, Army Materials and Mechanics Research Center, Watertown, Mass., Technical Report TR72-12, 1972.