Stephan J. Bless

article

Failure Waves and their Possible Roles in Determining Penetration Resistance of Glass

Stephan J. Bless

International Journal of Applied Ceramic Technology > 7 > 3 > 400 - 408

¹ High‐velocity impact can produce failure waves in glass. Failure waves limit the speed at which a glass target can become comminuted. The resulting time dependence of strength is likely to influence resistance to ballistic penetration.

article

Hypervelocity jacketed penetrators

Bradley A. Pedersen, Stephan J. Bless, James U. Cazamias

International Journal of Impact Engineering > 2001 > 26 > 1-10 > 603-611

The use of steel jackets was found to significantly improve the penetration efficiency of tungsten alloy rods. Experiments and analyses were conducted with L/D=10 projectiles of constant exterior dimensions at a nominal impact velocity of 2.2 km/s. The fraction of jacket material was varied to see which geometry would have the best performance. For a core-to-jacket diameter ratio (μ) of 0.6, the experiments...

article

Transverse loads on a yawed projectile

Stephan J. Bless, Sikhanda Satapathy, Michael J. Normandia

International Journal of Impact Engineering > 1999 > 23 > 1 Part 1 > 77-86

Yaw has been known to greatly influence the penetration performance of long-rod projectiles. Experiments have shown that even small angles of yaw can significantly degrade performance. We show that a critical feature of a yawed impact is the transverse load on the penetrator. Transverse loads tend to decrease the misalignment of rod axis and velocity vector. We use classical cavity expansion theory...

article

The effect of offset on the performance of segmented penetrators

David L. Littlefield, Richard M. Garcia, Stephan J. Bless

International Journal of Impact Engineering > 1999 > 23 > 1 Part 2 > 547-560

The purpose of this investigation is to study the effect of offset on the performance of segmented penetrators. The Eulerian wave propagation code CTH is used for this purpose. The veracity of the code in predicting the penetration depth of short L/D projectiles where channel sidewall interference is present is examined by comparing to a few experiments involving penetration of tungsten alloy cylinders...

article

Cavity models for solid and hollow projectiles

Minhyung Lee, Stephan J. Bless

International Journal of Impact Engineering > 1998 > 21 > 10 > 881-894

Two analytical models for the crater size generated by long-rod and thick-walled tube projectiles are presented. The first is based on energy; in a steady-state penetration, the kinetic energy loss of a projectile is related to the total energy deposited in the target. This simple approach provides an upper bound for the crater size. The second approach is based on the observation that two mechanisms...

article

The penetration of asymmetric long-rod projectiles at 2.6 km/s

David L. Littlefield, Charles E. Anderson, Stephan J. Bless

International Journal of Impact Engineering > 1998 > 21 > 8 > 625-643

The penetration ability of asymmetric long-rod projectiles at 2.6 km/s is investigated in this numerical study. Five different projectile cross sections were considered. Results from the simulations indicate that the penetration velocity of the projectiles is only marginally influenced by the cross-sectional shape of the penetrator; the greatest reductions are seen for the projectiles with the largest...

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The penetration of steel targets finite in radial extent

David L. Littlefield, Charles E. Anderson, Yehuda Partom, Stephan J. Bless

International Journal of Impact Engineering > 1997 > 19 > 1 > 49-62

An experimental, analytical, and computational effort was undertaken to examine the effect of confinement on penetration in armor-like steel targets. For the experiments, LD 10, tungsten-alloy projectiles were fired at 1.5 km/s into 4340 steel cylindrical rounds of various diameters. Penetration efficiencies, as measured by the depth of penetration normalized by the original projectile length (PL),...

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On the L/D effect for long-rod penetrators

Charles E. Anderson, James D. Walker, Stephan J. Bless, Yehuda Partom

International Journal of Impact Engineering > 1996 > 18 > 3 > 247-264

A common measure of penetration efficiency is given by the depth of penetration P into a semi-infinite target normalized by the original length of the projectile L. It has been known for over 30 years that P/L depends upon the aspect ratio L/D for projectiles with relatively small aspect ratios, e.g. 1 L/D 10. This influence of L/D on penetration is referred to as the L/D effect. Although...

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On the velocity dependence of the L/D effect for long-rod penetrators

Charles E. Anderson, James D. Walker, Stephan J. Bless, T.R. Sharron

International Journal of Impact Engineering > 1995 > 17 > 1-3 > 13-24

At ordnance velocities (1.0 – 1.9 km/s), there is a pronounced decrease in penetration efficiency, as measured by P/L, when projectiles of larger L/D are used. The influence of L/D on penetration is referred to as the L/D effectd. We numerically examine the L/D effect at higher velocities, from 2.0 km/s to 4.5 km/s. It is found that as the velocity increases, there is a change in mechanism for the...

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Search results for: Stephan J. Bless

Failure Waves and their Possible Roles in Determining Penetration Resistance of Glass

Hypervelocity jacketed penetrators

Transverse loads on a yawed projectile

The effect of offset on the performance of segmented penetrators

Cavity models for solid and hollow projectiles

The penetration of asymmetric long-rod projectiles at 2.6 km/s

The penetration of steel targets finite in radial extent

On the L/D effect for long-rod penetrators

On the velocity dependence of the L/D effect for long-rod penetrators

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