2 octobre 2018 | International, Terrestre
Future soldiers will be better protected in combat by stronger and lighter body armor thanks to innovative work at the U.S. Army Research Laboratory. Materials science engineers are using nature as the inspiration for breakthroughs in additive manufacturing.
“My project is to design a system that can 3-D print armor ceramics that will allow production of parts with graded structures similar to an abalone structure in nature that will improve the ceramic armor's toughness and survivability with lower weight,” said Joshua Pelz, a materials science and engineering doctoral candidate at the University of California San Diego. He spent this summer working with Army scientists at ARL's Rodman Materials Science Laboratory at APG to design and build a unique 3-D printer.
Two syringes containing distinct, viscous ceramic slurries are connected to a custom-made auger and print head. Pelz took advantage of his computer programming skills to hack into the 3-D printer, tricking it into using its own fan controls to manipulate the ratio of materials being printed. He designed a custom auger and print head and even used the same 3-D printer to create those parts.
“Josh found a way to implement our ideas into that machine, take apart machine, take out the polymer FDM heads that are built into it, start to look at how to design the machine to incorporate our ceramic slurries and print those slurries into the head but then he had to do a lot of really basic work looking at how to actually hack the machine,” said Dr. Lionel Vargas-Gonzalez, Ceramics Synthesis and Processing team lead at the laboratory. “We've got people like Josh who were very gifted and talented and can bring all that kind of capability and use a lot to our advantage it's a huge benefit for us.”
Current processing techniques used to create ceramic armor are limited by how engineers can combine materials into a stronger composite material.
“For ceramics, that's a bit of a challenge because with you can't really do what a one-step additive manufacturing process like you could if a metal or a polymer,” Vargas-Gonzalez said. “We see this as a next avenue for armor because we're going to be able to, in theory, design armor in a way that we can attach multiple materials together into a single armor plate, and be able to provide ways for the armor to perform better than it can be just based on one material alone.”
Full article: http://science.dodlive.mil/2018/10/01/army-looks-to-nature-to-improve-body-armor/
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ATLANTA, Oct. 15, 2019 /PRNewswire/ -- Lockheed Martin (NYSE: LMT) announced today the global community of C-130J Super Hercules operators recently surpassed 2 million flight hours. These hours were logged beginning with the C-130J's first flight on April 5, 1996, through the end of July 2019. Twenty-two operators from 18 nations contributed to this achievement, adding hours through multiple missions including combat, transport, aerial refueling, special operations, medevac, humanitarian relief, search and rescue, weather reconnaissance, firefighting and commercial freight delivery. Rod McLean, vice president and general manager of the Air Mobility & Maritime Missions line of business at Lockheed Martin, announced the milestone at the Hercules Operators Conference, the annual C-130 operator-industry event held in Atlanta. "The C-130J has earned a reputation as the world's workhorse and this most recent achievement is a powerful reminder of the Super Hercules' unmatched global reach," McLean said. "Crews continue to exemplify the C-130J's proven capability and versatility with every mission they fly. The Lockheed Martin team is proud of the work of the Super Herc crews who rely on the C-130J to support vital missions, both home and abroad." Countries with military variant C-130Js contributing to these flight hours include (in order of delivery) the United Kingdom, United States (the U.S. Air Force, Marine Corps and Coast Guard), Australia, Italy, Denmark, Norway, Canada, India, Qatar, Iraq, Oman, Tunisia, Israel, Kuwait, South Korea, Saudi Arabia, France, and Bahrain. Also contributing is Lockheed Martin Flight Operations, whose crews are the first to fly every C-130J produced. The U.S. Air Force maintains the largest C-130J fleet, with Super Hercs flown by Air Mobility Command, Air Combat Command, Air Education and Training Command, Special Operations Command, and Air National Guard and Air Force Reserve units. In addition, Defence Contract Management Agency crews support C-130J test flights at Lockheed Martin's Aeronautics site in Marietta, Georgia, home of C-130 production. The C-130J Super Hercules is the current production model of the legendary C-130 Hercules aircraft. For more information on the C-130J Super Hercules, visit www.lockheedmartin.com/c130. About Lockheed Martin Headquartered in Bethesda, Maryland, Lockheed Martin is a global security and aerospace company that employs approximately 105,000 people worldwide and is principally engaged in the research, design, development, manufacture, integration and sustainment of advanced technology systems, products and services. https://news.lockheedmartin.com/2019-10-15-Super-Herculean-Accomplishment-Global-C-130J-Fleet-Surpasses-2-Million-Flight-Hours