Damage in steel plates from hypervelocity impact. I. Physical changes and effects of projectile material

Journal of Applied Physics

Volumn 46, Issue 9, 1975, Pages 3766-3775

  Shockey, D A ^a   Curran, D R ^a   De Carli, P S ^a  

^a SRI INTERNATIONAL   (United States)

Author keywords

[No Author keywords available]

Indexed keywords

STEEL - HIGH PRESSURE EFFECTS;

PLATES;

EID: 0016557379     PISSN: 00218979     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.322162     Document Type: Article

References (29)

1. The hypervelocity impact experiments reported in this paper were performed by Walter Atkins and Mario Persechino of the Naval Research Laboratory, Washington, D.C., at the NRL facility.
2. Abbott (Ref. 4) examined similar steel targets impacted at lower velocities and observed the etch-darkened region, shear bands extending from the crater surfaces, and associated shear cracks, but he did not observe the voids or the crosshatched shear band network in the subscrater region.
3. An initial rapid fall off in hardness occurred within the etch-darkened zone and may be attributable to the arrival of unloading waves from the area of the front surface not impacted by the projectile (see Paper II).
4. Since the high-pressure ε phase reverts completely to the α phase upon pressure release, it was not possible to obtain rigorous proof in postshot analyses.
5. Stevens (Ref. 12) performed flat-plate impact experiments on two austenitic steels using a gas gun to accelerate the plates and a laser interferometer to monitor the free surface velocities.
6. One percent nital ([formula omitted] conc. [formula omitted] in [formula omitted] methyl alcohol) or Vilella’s reagent [[formula omitted] ethanol (Ref. 3), [formula omitted] conc.
7. The impact of a steel sphere at this velocity may cause melting of portions of the projectile and target (Ref. 20).
8. These measurements were made by G. Ullrich of Mobility Equipment Research and Development Center, Fort Belvoir, Va.