Defense

January 24, 2014

Army program secures critical component for artillery, mortar ammunition

Tags:
Dan Lafontaine
Aberdeen Proving Ground, Md.

Soldiers assigned to Bulldog Battery, Field Artillery Squadron, 2nd Cavalry Regiment, load a M777A2 Howitzer during 2nd Cavalry Regiment’s Maneuver Rehearsal Exercise at Grafenwoehr Training Area, Germany, Feb. 13, 2013. The U.S. Army is nearing completion on a project to eliminate its dependency on foreign countries for a critical energetic component in artillery and mortar ammunition.

The U.S. Army is nearing completion on a project to eliminate its dependency on foreign countries for a critical energetic component in artillery and mortar ammunition, officials said.

Because of changes in the global cotton industry, the United States no longer has a domestic source of quality raw material for manufacturing nitrocellulose for combustible cartridge cases that are used extensively by the military. A domestic source is necessary to ensure a sufficient supply of quality cartridge cases, which is vital to maintaining readiness of the armed forces, according to Army experts.

Kristy Klein, project officer, Office of the Project Manager for Combat Ammunition Systems, and her colleagues immediately began to investigate possible technology solutions to meet the military’s operational needs.

“The American cotton industry has changed from producing raw material that is a loose fiber to a pressed stock material,” Klein said. “The processes downstream in our manufacturing facilities are not capable of handling the physical change. The pressed stock material could not meet the Army’s needs for combustible case materials.”

Since foreign companies are the only source of nitrocellulose from baled cotton linters, the Army needed a solution that will allow the use of domestically produced nitrocellulose from pressed stock, which is readily available from domestic sources, Klein said.

“The problem in the manufacturing of the combustible cases using pressed stock nitrocellulose is that cutting or shredding the material using the existing process results in tight clumps of cotton fibers,” she said. “Several attempts at breaking up these clumps were unsuccessful. In fact, a study by a leading pressed stock producer showed that cutting actually welded the fibers together.”

Klein explained that these clumps inhibit achieving a homogeneous composition of the slurry used to manufacture combustible cases, thus causing variations in energetic composition throughout the product. This non-homogeneity caused by the clumps of pressed stock within the combustible case results in burning residue in the gun chamber after firing.

“It’s a safety issue as the burning debris could ignite the next round during insertion into the chamber,” Klein said.

Another major concern is the poor performance in terms of muzzle velocity variation, she said. Production data have shown the muzzle velocity variance to be four times greater when using nitrocellulose with clumps.

To establish a manufacturing process using domestic pressed sheet and alleviate these performance and safety issues, the Army turned to the Office of the Secretary of Defense Comparative Technology Office’s Foreign Comparative Testing, or FCT, program, in 2010. FCT’s mission is to find and evaluate “here and now” solutions to meet operational needs, regardless of the origin of that technology.

The U.S. Army Research, Development and Engineering Command, known as RDECOM, manages the FCT for the Army.

“FCT provides foreign companies with the ‘on ramp’ to Army acquisition,” said William “Randy” Everett, FCT project officer at RDECOM headquarters. “When a foreign company has a mature technology or product the U.S. Army has a requirement for, FCT allows program managers to leverage [Office of the Secretary of Defense] funds for test and evaluation.”

The Army leveraged FCT funds to review foreign nitrocellulose manufacturers’ processes that utilize pressed stock. Klein’s team evaluated technologies from companies in France and the Czech Republic.

“How are they breaking down the pressed stock? That is, taking something like pressed cardboard and fluff it again into loose fibers? What processes are they using, and what can we do to bring it to the U.S.? We tested their processed material through the FCT program, and we specifically used a domestic source for the pressed stock,” Klein said. “Their nitrocellulose worked in our combustible cases, eliminating the safety and performance issues.”

The key to the process was a Hammer Mill machine, which fluffed the pressed stock without major damage to the fibers. The tests of these technologies were successful, and the Army has subsequently purchased a Hammer Mill machine that will enable this manufacturing process for nitrocellulose to be transitioned to the United States.

Two Program Executive Office Ammunition offices, PM-CAS and Project Manager for Maneuver Ammunition Systems, are working closely with BAE Systems, the operating contractor of the Radford Army Ammunition Plant, to install, prove-out and commission the Hammer Mill.

“The true success is that we’re going to implement the process in the U.S. and will again be able to use a domestic source for quality raw nitrocellulose material. This would not have happened without the support from the FCT office,” Klein said.




All of this week's top headlines to your email every Friday.


 
 

 

Headlines July 30, 2014

News: Software to power F-35 running as much as 14 months late¬†- Software needed to operate Lockheed Martin’s F-35 jet, the Pentagon’s costliest weapons system, may be as much as 14 months late for required flight testing, according to a Pentagon review.   Business: Lockheed will turn on JLTV production line In August; 6-D truck...
 
 

News Briefs July 30, 2014

U.S. military deaths in Afghanistan at 2,197 As of July 29, 2014, at least 2,197 members of the U.S. military had died in Afghanistan as a result of the U.S.-led invasion of Afghanistan in late 2001, according to an Associated Press count. At least 1,819 military service members have died in Afghanistan as a result...
 
 
Lockheed Martin photograph by Tom Reynolds

F-35B successfully completes wet runway, crosswind testing

Lockheed Martin photograph by Tom Reynolds F-35B aircraft BF-4, piloted by Lockheed Martin Test Pilot Dan Levin, starts down the runway as part of wet runway and crosswind testing at Edwards AFB, Calif. In an important program ...
 

 
boeing-chinook

Boeing delivers first U.S. Army multiyear II configured Chinook

Boeing July 29 delivered the first multiyear II configured CH-47F Chinook helicopter to the U.S. Army one month ahead of schedule. The delivery was celebrated in a ceremony at the production facility in Ridley Township, Penn. ‚...
 
 
Army photograph by SSgt. Angela Stafford

Engineers developing safer, more accurate tracer round

Army photograph Tracer rounds enable the shooter to follow the projectile trajectory to make aiming corrections. However, the light emitted by these rounds also gives away the position of the shooter. Engineers at Picatinny Ars...
 
 
NASA photograph by Carla Thomas

Katherine Lott awarded NASA Armstrong employee scholarship

NASA photograph by Carla Thomas Katherine Lott, the recipient of the 2014 NASA Armstrong Employee Exchange Council Joseph R. Vensel Memorial Scholarship, is congratulated by NASA Armstrong center director David McBride. Flankin...
 




0 Comments


Be the first to comment!


Leave a Reply

Your email address will not be published. Required fields are marked *

You may use these HTML tags and attributes: <a href="" title=""> <abbr title=""> <acronym title=""> <b> <blockquote cite=""> <cite> <code> <del datetime=""> <em> <i> <q cite=""> <strike> <strong>