The F-22’s BMI accommodated application of resin transfer molding (RTM), including RTM internal ribs and spars, parts with "T" of "I" cross-sections. Although the air-to-air F-22 program has been canceled in favor of the air-to-surface-oriented F-35, considered more useful in foreseeable military engagements, the Raptor’s airframe has served as an important test bed for BMI processing technology, and is about 25 percent composite by weight, split 50/50 between reinforced epoxy and BMI resins. For these reasons, BMIs have served on military aircraft for decades and into 5th Generation fighter planes, such as Lockheed Martin’s F-22 Raptor and the F-35 Lightning II Joint Strike Fighter.
Battle dress for BMIsĬlose relatives of the polyimides, BMIs offer temperature performance and price between that of polyimides and epoxies and, because they cure by addition reaction rather than condensation reaction, they mitigate problems with emitted volatiles. Not as widely used as polyimides, this group of resins in composites is gaining traction because they offer aerospace engineers a broader palette of tailorable matrices from which to choose when called on to meet thermal challenges within program cost targets. Here, in Part II, we do the same for bismaleimides (BMIs), cyanate esters (CEs), benzoxazines and phthalonitriles.
THE HOT ZONE UPDATE
In Part I of this two-part series, HPC offered an update on the earliest and most widely used of these high-temperature alternatives, the polyimides (see "Editor's Picks under “Learn More,” at right). Though it’s no small feat to compete with well-developed and still-evolving epoxy chemistry in aerospace components, other thermoset resins are expanding the high-temperature operations regime. Lynda Obst is an executive producer, while Richard Preston is on board as a co-executive producer on the series.Today, the rigors of flight demand robust materials that can handle thermal extremes: military aircraft require thousands of hours of service from engine nozzles that see up to 750☏/399☌, and spacecraft and missiles must endure short-duration launch and re-entry temperatures to 1500☏/816☌. In addition to Souders and Peterson, “The Hot Zone: Anthrax” will be exeucutive produced by Scott Free’s Ridley Scott and David W. We’re eager to tell this extraordinary story of all the drama that unfolded to overcome the attacks and identify the perpetrator.” “All of us well remember the anthrax attacks in 2001, which rocked and terrified the country.
THE HOT ZONE FREE
Zucker, president of Scott Free Television. “After a terrific collaboration with our friends at National Geographic on ‘The Hot Zone,’ we couldn’t be more excited to be back in business with the same stellar team for another season,” said David W.
It was inspired by the true events surrounding the origins of the Ebola virus and its arrival on U.S. Season 1 of “Hot Zone” starred Julianna Margulies and was based on Richard Preston’s bestselling book.
THE HOT ZONE SERIES
“The second season of our anthology series will dive deep into the forensic investigation of a simple envelope that sent the entire Eastern Seaboard into a panic.”
“While many of us can recall the breaking news headlines and the widespread fear that ensued when anthrax emerged in America, there are still layers to this story that have not yet been told,” said Souders. Nat Geo renewing the series is hardly surprising, given that it touts “Hot Zone” as its highest-rated scripted series ever. An unlikely team of USAMRIID scientists, FBI agents and Justice Department personnel slowly closed in on a shocking prime suspect. The anonymous assault claimed five lives, left 17 others sick and caused panic throughout the U.S.
The second season will depict the events which occurred just weeks after 9/11 and which involved letters containing anthrax being sent to unsuspecting victims in Florida, Washington, D.C.
0 kommentar(er)
