The influence of pitch (vertical yaw) angle on the penetration reduction of rod projectiles into oblique targets has been investigated for tungsten sinter alloy rods with a blunt nose and L/D = 20. Semi-infinite RHA targets with an obliquity of 30 deg, 45 deg, and 60 deg were impacted at 1650 m/s. The pitch angles were varied between ±90 deg. The strong asymmetric behavior of the target crater is dependent on whether the pitch is positive or negative relative to the obliquity of the target. The experiments provide a good overview of the penetration characteristics of long rods for the whole pitch angle range. The penetration data are described by empirical relations that show good agreement with the experiments.

References

1.
Sorensen
,
B. R.
,
Kimsey
,
K. D.
,
Silsby
,
G. F.
,
Scheffler
,
D. R.
,
Sherick
,
T. M.
, and
deRosset
,
W. S.
,
1991
, “
High Velocity Penetration of Steel Targets
,”
Int. J. Impact Eng.
,
11
(
1
), pp.
107
119
.10.1016/0734-743X(91)90034-D
2.
Bjerke
,
T. W.
,
Silsby
,
G. F.
,
Scheffler
,
D. R.
, and
Mudd
,
R. M.
,
1992
, “
Yawed Long-Rod Armor Penetration
,”
Int. J. Impact Eng.
,
12
(
2
), pp.
281
292
.10.1016/0734-743X(92)90473-7
3.
Schmidt
,
V.
,
1990
, “
A Methodology to Evaluate the Effect of Yaw on Penetration
,”
Proceedings of the 12th International Symposium on Ballistics
, San Antonio, TX, October 30-November 1, Vol.
2
, pp.
377
383
.
4.
Anderson
,
C. E.
, Jr.
,
Bless
,
S. J.
,
Sharron
,
T. R.
, and
Normandia
,
M. J.
,
1998
, “Investigation of Yawed Impacts Into a Finite Target,”
AIP Conf. Proc.
,
429
, pp.
925
928
.10.1063/1.55615
5.
Goldsmith
,
W.
,
1999
, “
Non-Ideal Projectile Impact on Targets
,”
Int. J. Impact Eng.
,
22
(
2–3
), pp.
95
395
.10.1016/S0734-743X(98)00031-1
6.
Bless
,
S. J.
,
Barber
,
J. P.
,
Bertke
,
R. J.
, and
Swift
,
H. F.
,
1978
, “
Penetration Mechanics of Yawed Rods
,”
Int. J. Eng. Sci.
,
16
(
11
), pp.
829
834
.10.1016/0020-7225(78)90068-X
7.
Yaziv
,
D.
,
Rosenberg
,
Z.
, and
Riegel
,
J. P.
,
1990
, “
Penetration Capability of Yawed Long Rod Penetrators
,”
Proceedings of the 12th International Symposium on Ballistics
, San Antonio, TX, October 30-November 1, Vol.
3
, pp.
202
207
.
8.
Yaziv
,
D.
,
Walker
,
J. D.
, and
Riegel
,
J. P.
,
1992
, “
Analytical Model of Yawed Penetration in the 0 to 90 Degrees Range
,”
Proceedings of the 13th International Symposium on Ballistics
, Stockholm, June 1–3, Vol.
3
, pp.
17
23
.
9.
Bukharev
,
Yu I.
, and
Zhukov
,
V. I.
,
1995
, “
Model of the Penetration of a Metal Barrier by a Rod Projectile With an Angle of Attack
,”
Combustion, Explosion, and Shock Waves
,
31
, pp.
362
367
.10.1007/BF00742683
10.
Wollmann
,
E.
,
Hoog
,
K.
,
Koerber
,
G.
, and
Wellige
,
B.
,
1996
, “
Endballistische Leistung Angestellter Penetratoren
,” Bericht R 110/96,
French-German Research Institute (ISL)
,
Saint Louis, France
.
11.
Hohler
,
V.
, and
Behner
,
Th.
,
1999
, “
Influence of the Yaw Angle on the Performance Reduction of Long Rod Projectiles
,”
Proceedings of the 18th International Symposium on Ballistics
, Antonio, TX, November 15–19, Vol.
2
,
Technomic Publishing Co., Inc., Lancaster, PA
, pp. 931–938.
12.
Wollmann
,
E.
,
Chanteret
,
P. Y.
, and
Wellige
,
B.
,
2001
, “
Leistung Schlanker Penetratoren Bei Kleiner Bis Mittlerer Anstellung
,” Bericht RV 207/2001,
French-German Research Institute (ISL)
,
Saint Louis, France
.
13.
Roecker
,
E.
, and
Grabarek
,
C.
,
1986
, “
The Effect of Yaw and Pitch on Long Rod Penetration Into Rolled Homogeneous Armor at Various Obliquities
,”
Proceedings of the 9th International Symposium on Ballistics
, Shrivenham, UK, April 29-May 1, Vol.
2
, pp.
467
473
.
14.
Cagliostro
,
D. J.
,
Mandell
,
D. A.
,
Schwalbe
,
L. A.
,
Adams
,
T. D.
, and
Chapyak
,
E. J.
,
1990
, “
MESA 3-D Calculations of Armor Penetration By Projectiles With Combined Obliquity and Yaw
,”
Int. J. Impact Eng.
,
10
(
1–4
), pp.
81
92
.10.1016/0734-743X(90)90050-6
15.
Johnson
,
G. R.
, and
Cook
,
W. H.
,
1993
, “
Lagrangian EPIC Code Computations for Oblique, Yawed-Rod Impacts Onto Thin-Plate and Spaced-Plate Targets at Various Velocities
,”
Int. J. Impact Eng.
,
14
(
1–4
), pp.
373
383
.10.1016/0734-743X(93)90035-6
16.
Normandia
,
M. J.
,
1999
, “
Eroded Length Model for Yawed Penetrators Impacting Finite Thickness Targets at Normal and Oblique Incidence
,”
Int. J. Impact Eng.
,
23
(
1–10
), pp.
663
674
.10.1016/S0734-743X(99)00112-8
17.
Gee
,
D. J.
,
2001
, “
Oblique Plate Perforation by Slender Rod Projectiles
,”
Proceedings of the 19th International Symposium on Ballistics
, Interlaken, Switzerland, May 7–11, Vol.
3
, pp.
1123
1132
.
18.
Rohr
,
I.
,
Nahme
,
H.
,
Thoma
,
K.
, and
Anderson
,
C. E.
, Jr.
,
2008
, “
Material Characterisation and Constitutive Modelling of a Tungsten-Sintered Alloy for a Wide Range of Strain Rates
,”
Int. J. Impact Eng.
,
35
(
8
), pp.
661
673
.10.1016/j.ijimpeng.2007.12.006
19.
Anderson
,
C. E.
, Jr.
, and
Walker
,
J. D.
,
1995
, “
An Analytic Expression for P/L for WA Long Rods Into Armor Steel
,”
AIP Conf. Proc.
,
370
, pp.
1135
1138
.10.1063/1.50782
20.
Walker
J. D.
, and
Anderson
,
C. E.
, Jr.
,
1995
, “
A Time-Dependent Model for Long-Rod Penetration
,”
Int. J. Impact Eng.
,
16
(
1
), pp.
19
48
.10.1016/0734-743X(94)00032-R
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