Tools

LEADER 03709nam a2200721Ia 4500

001 ocm64440390;

003 OCoLC;

005 20141212052107.0;

006 m d f ;

007 cr mn|||||||||;

008 080512s2005 dcua sb f000 0 eng d;

027 a| ARL-TR-3578;

029 0 a| DTICEb| ADA437117;

035 a| (Sirsi) o64440390;

035 a| (OCoLC)64440390;

040 a| DTICEc| DTICEd| GPOd| UtOrBLW;

049 a| ERE#;

074 a| 0324-A-01 (online);

086 0 a| D 101.133:3578;

100 1 a| Raftenberg , Martin N.?| UNAUTHORIZED;

245 10 a| Bending of threaded and unthreaded tungsten rods under oblique impact /c| by Martin N. Raftenberg and Todd W. Bjerke.;

260 a| Aberdeen Proving Ground, MD :b| U.S. Army Research Laboratory,c| [2005];

300 a| 1 online resource (vi, 45 pages) :b| illustrations.;

336 a| text2| rdacontent;

337 a| computer2| rdamedia;

338 a| online resource2| rdacarrier;

490 1 a| ARL-TR ;v| 3578;

500 a| Title from title screen (viewed May 28, 2010).;

500 a| "August 2005.";

500 a| The original document contains color images.;

504 a| Includes bibliographical references (p. 29).;

506 a| APPROVED FOR PUBLIC RELEASE.;

513 a| Final;b| October 2004 to August 2005.;

520 a| We employed ballistic experiments and finite element (FE) analysis to explore the extent to which. and the mechanism by which, the threading on a tungsten heavy alloy rod increases its susceptibility to break up under conditions of oblique impact. In the laboratory. small-scale rods with and without threads were launched into thin rolled homogeneous armor plates at 1300 m/s and 60 degrees' obliquity. Fracture near the nose of the rod occurred more consistently with the threaded rods. LS- DYNA(Trademark) was used to analyze plane strain elastic impact of threaded and unthreaded rods striking a rigid surface at 10 m/s and 60 degrees' obliquity. These calculations revealed a greater degree of bending in a threaded rod than in an unthreaded rod of the same diameter. The maximum principal stress, which has been used as a criterion for brittle tensile fracture, also attained larger values in the threaded than in the unthreaded rod. With the aid of static FE analyses of cantilevered, point-loaded, threaded and unthreaded rods, the results of which could be compared with an analytical result from plate theory, we associated the increased bending with a decrease in effective rod thickness.;

536 f| 1L162618AH80.;

650 0 a| Tungstenx| Metallurgy.=| ^A1017345;

650 0 a| Tungsten alloys.=| ^A1017346;

650 0 a| Weapons systems.=| ^A53491;

650 17 a| Metallurgy and Metallography.2| scgdst;

650 27 a| Numerical Mathematics.2| scgdst;

650 27 a| Ballistics.2| scgdst;

650 17 a| Brittleness.2| dtict;

650 17 a| Ballistics.2| dtict;

650 27 a| Finite element analysis.2| dtict;

650 27 a| Tensile properties.2| dtict;

650 27 a| Screw threads.2| dtict;

650 27 a| Tungsten.2| dtict;

650 27 a| Elastic properties.2| dtict;

650 27 a| Fracture(mechanics)2| dtict;

653 2 a| BENDING;

653 2 a| KE ROD;

653 2 a| OBLIQUE IMPACT;

653 2 a| THREADING;

653 2 a| TUNGSTEN HEAVY ALLOY;

700 1 a| Bjerke, Todd W.=| ^A1023392;

710 2 a| U.S. Army Research Laboratory.=| ^A367731;

830 0 a| ARL-TR (Aberdeen Proving Ground, Md.) ; 3578.?| UNAUTHORIZED;

856 40 u| https://purl.fdlp.gov/GPO/LPS122567;

949 a| Click on web addressw| ASISh| JOYNER94;

998 a| 2285002;

998 a| u2285002;

596 a| 1;

999 a| CLICK ON WEB ADDRESSw| ASISc| 1i| 2285002-1001l| JNETm| JOYNERr| Ys| Yt| JNE1DOu| 7/22/2010x| EDOCUMENTz| JERESOURCE;

Bending of threaded and unthreaded tungsten rods under oblique impact / by Martin N. Raftenberg and Todd W. Bjerke.

Author/creator	Raftenberg , Martin N.
Other author	Bjerke, Todd W.
Other author	U.S. Army Research Laboratory.
Format	Electronic
Publication Info	Aberdeen Proving Ground, MD : U.S. Army Research Laboratory, [2005]
Description	1 online resource (vi, 45 pages) : illustrations.
Supplemental Content	https://purl.fdlp.gov/GPO/LPS122567
Subjects	Tungsten--Metallurgy. Tungsten alloys. Weapons systems.

Series	ARL-TR ; 3578 ARL-TR (Aberdeen Proving Ground, Md.) ; 3578. UNAUTHORIZED
Abstract	We employed ballistic experiments and finite element (FE) analysis to explore the extent to which. and the mechanism by which, the threading on a tungsten heavy alloy rod increases its susceptibility to break up under conditions of oblique impact. In the laboratory. small-scale rods with and without threads were launched into thin rolled homogeneous armor plates at 1300 m/s and 60 degrees' obliquity. Fracture near the nose of the rod occurred more consistently with the threaded rods. LS- DYNA(Trademark) was used to analyze plane strain elastic impact of threaded and unthreaded rods striking a rigid surface at 10 m/s and 60 degrees' obliquity. These calculations revealed a greater degree of bending in a threaded rod than in an unthreaded rod of the same diameter. The maximum principal stress, which has been used as a criterion for brittle tensile fracture, also attained larger values in the threaded than in the unthreaded rod. With the aid of static FE analyses of cantilevered, point-loaded, threaded and unthreaded rods, the results of which could be compared with an analytical result from plate theory, we associated the increased bending with a decrease in effective rod thickness.
General note	Title from title screen (viewed May 28, 2010).
General note	"August 2005."
General note	The original document contains color images.
Bibliography note	Includes bibliographical references (p. 29).
Access restriction	APPROVED FOR PUBLIC RELEASE.
Report note	Final; October 2004 to August 2005.
Funding information	1L162618AH80.
Technical rpt#	ARL-TR-3578
GPO item number	0324-A-01 (online)
Govt. docs number	D 101.133:3578

Availability

Library	Location	Call Number	Status	Item Actions
	Electronic Resources	Access Content Online	✔ Available

Bending of threaded and unthreaded tungsten rods under oblique impact / by Martin N. Raftenberg and Todd W. Bjerke.

Click here for more information about this title

Availability