Multi-ply heterogeneous armor with viscoelastic layers and cylindrical armor elements

19 Pages·2014·1.42 MB·English

US008789454B1
(12) United States Patent (10) Patent N0.: US 8,789,454 B1
Roland et a]. (45) Date of Patent: Jul. 29, 2014
(54) MULTI-PLY HETEROGENEOUS ARMOR (56) References Cited
WITH VISCOELASTIC LAYERS AND
U.S. PATENT DOCUMENTS
CYLINDRICAL ARMOR ELEMENTS
3,431,818 A * 3/1969 King .......................... .. 89/3602
(71) Applicants:Charles M. Roland, Waldorf, MD (US); 4,404,889 A 9/1983 Miguel
Daniel M. Fragiadakis, Alexandria, VA H001061 H 6/1992 Rozner et 31.
(US); Raymond M. Gamache, Indian 5,190,802 A 3/1993 Pilato
5,349,893 A 9/1994 Dunn
Head, MD (US)
5,361,678 A * 11/1994 Roopchand et a1. ....... .. 89/3602
6,679,157 B2 1/2004 Chu et a1.
(72) Inventors: Charles M. Roland, Waldorf, MD (US); 6,895,851 B1 5/2005 Adams et a1.
Daniel M. Fragiadakis, Alexandria, VA 7,300,893 B2 * 11/2007 Barsoum et al. ............ .. 442/134
(US); Raymond M. Gamache, Indian 7,938,053 B1 5/2011 Dudt et a1.
8,087,143 B2 1/2012 DiPietro
Head, MD (US) 8,215,223 B2 7/2012 Lucuta et a1.
8,220,378 B2 7/2012 Gamache et a1.
(73) Assignee: The United States of America, as (Continued)
represented by the Secretary of the
Navy, Washington, DC (US) OTHER PUBLICATIONS
Backman M.E ., and Goldsmith W., “The mechanics of penetration of
Notice: Subject to any disclaimer, the term of this
projectiles into targets”, Int J Eng Sci 16 (1978), pp. 1-99.
patent is extended or adjusted under 35
U.S.C. 154(b) by 0 days. (Continued)
(21) Appl. N0.: 13/944,073 Primary Examiner * Bret Hayes
Assistant Examiner * Joshua Freeman
(22) Filed: Jul. 17, 2013 (74) Attorney, Agent, or Firm * US Naval Research
Laboratory; Sally A. Ferrett
Related U.S. Application Data (57) ABSTRACT
(62) Division of application No. 13/829,977, ?led on Mar. An armor system with a composite laminate having at least
four alternating layers (two bi-layers) of a ?rst material and a
14, 2013, now Pat. No. 8,746,122, which is a division
second material, the ?rst material having a lower acoustic
of application No. 13/085,130, ?led on Apr. 12, 2011.
impedance than the second material. The ?rst material is a
(60) Provisional application No. 61/322,963, ?led on Apr. viscoelastic polymer with a glass transition temperature less
12, 2010. than the expected operational temperature range, and the
second material can be a hard material such as steel, alumi
(51) Int. Cl.
num, or ceramic. The laminate can include many alternating
F41H 5/04 (2006.01)
layers of elastomer and hard material, and can be adhered or
(52) U.S. Cl. ai?xed to a thicker armor substrate. Additional protective
CPC .......... .. F41H 5/0421 (2013.01); F41H 5/0428 elements such as corrugated metal-ceramic panels and
(2013.01) armored glass cylinders can be added to improve resistance to
USPC .......................................... .. 89/36.02; 89/903 armor piercing rounds, explosively formed penetrators, or
(58) Field of Classi?cation Search other threats.
USPC ............ .. 89/36.02*36.09, 9034917; 109/495
See application ?le for complete search history. 10 Claims, 9 Drawing Sheets
US 8,789,454 B1
Page 2
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US. Patent
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EFFECTOF FRONT-SURFACE ELASTONIERLAYERSON 91919119 999109 STEELPLATES
CONSTRUCTION 91EE9111E991NN1 E1191ONE9919E991NN) 19E119EN911N1NO1N12) 99919119)
SINGLE LAYER ONE12.19 NONE 99 1991919
91N99E911ER ONE12.1b NONE 99 119199
Bl-LAYER ONE12.1b ONE12.1 119 119991
FOUR LAYERS 1999.19 9909.1 119 191992
EIGHTLAYERS 999119.29 90999.2 119 191991
9 RONEONONOOENE09911RNOR
9 111911 11199 91EEE
EFFECTOF ELASTOMER 919E999 ON 91199119 NNNN REDUCED LAMINATE WEIGHT
CONSTRUCTION 1919 LAYERS [MM] ELASTOMER LAYERS [MM] 19E119EN91111NON12) 9991919)
SINGLE LAYER ONE12.1 NONE 99 119199
Bl-LAYER ONE12.1 ONE9.1 199 199999
FOUR LAYERS 1999.1 NNO9.2 99 199991
FOUR LAYERS 1909.9 NNO9.2 99 119191
FIG. 7B
EEEEO1OELANNNANONOEE9191ONEROONNNOON9119911OPEREORNAN9E
CONSTRUCTION 1919 LAYERS 1NN) ELASTOMER 911E999 19E119EN911N1NO1N2) 9991919)
91NOEE919ER ONE11.99 NONE 99 99999
SINGLE LAYER ONE 9.9b NONE 12 99291
21 LAYERS ONE 9.9b 9.1 919101111121 99911 19 99991
21 911E999 ONE 999 9.1 119! 10111111 9091119 9199) 91 1999
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FIG. 7C