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 August 28, 2014

News: After F-15 jet crash in Virginia, rescue helicopters search for pilot - Helicopters are searching for an Air National Guard pilot after his F-15 jet crashed in the mountains of Virginia this morning, military officials said.   Business: U.S. Air Force 3DELRR contract expected soon - The U.S. Air Force could award the contract for its...
 
 

News Briefs August 28, 2014

Russian directing new offensive in Ukraine The Obama administration believes Russia is leading a new military counteroffensive in Ukraine. U.S. State Department spokeswoman Jen Psaki says Russia has sent additional columns of tanks and armored vehicles into its neighbor’s territory. She says the incursions suggest a ìRussian-directed counteroffensive is likely underway in the contested e...
 
 
LM-C5

Double Deuce

A U.S. Air Force crew ferried the 22nd C-5M Super Galaxy from the Lockheed Martin facilities in Marietta, Ga., Aug. 25. Aircraft 86-0011 was ferried by a crew led by Maj. Gen. Dwyer L. Dennis, Director, Global Reach Programs, O...
 

 
Northrop Grumman photograph

First ever RQ-4 Global Hawk hits 100th flight on NASA mission

Northrop Grumman photograph A historical look at the first Global Hawk (AV1) during its maiden flight over Edwards Air Force Base, Calif., on Feb. 28, 1998. AV1 has made history again with its 100th flight in support of NASA en...
 
 

Northrop Grumman’s CIRCM system completes U.S. Army flight testing

Northrop Grumman’s Common Infrared Countermeasures system recently completed another round of U.S. Army testing by demonstrating its capabilities on a UH-60M Black Hawk helicopter. The flight test was conducted at Redstone Arsenal in Huntsville, Ala., by the Redstone Test Center. The Northrop Grumman CIRCM system was subjected to rigorous conditions over a six-week period, after...
 
 
NASA photograph by David Olive

NASA completes successful battery of tests on composite cryotank

https://www.youtube.com/embed/qkGI6JeNY0E?enablejsapi=1&rel=0 NASA photograph by David Olive One of the largest composite cryotanks ever built recently completed a battery of tests at NASA’s Marshall Space Flight Cen...
 




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>