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Published: Friday, February 09, 2018 @ 9:21 AM
Bonded composite airframe structures offer a potential to achieve more affordable manufacturing and more efficient structures, ultimately meeting the goals of the Air Force for increased range and reduced fuel consumption.
Laser bond inspection (LBI) in conjunction with bond process control is an enabling technology to transition primary bonded composite structures and realize these goals.
Composite structures, when joined using adhesive bonding rather than traditional rivets or fasteners, require a new inspection process to verify the strength and safety of the composite bonds.
LBI is a stress test to ensure that adhesively fastened structures are joined correctly using a bond’s response to a high-energy pulsed laser generated stress wave to detect structurally substandard bonds.
A weak, improperly prepared bond will be broken by the pulse, but a standard bond will remain unchanged after pulse excitation. Substandard adhesive bonds can result from errors created by poor adhesive mixing, improper surface preparation or contamination.
LBI is the only reliable and mature method capable of assessing the integrity of adhesive bonds in composite structures and detecting kissing bonds, a bond line defect where two surfaces are in intimate contact but are not properly bonded.
“This effort is a significant progression of more than a decade of collaboration and development work by the U.S. Air Force, The Boeing Company, LSP Technologies and additional major aerospace original equipment manufacturers,” said Andrea Helbach, Structures team lead in Air Force Research Laboratory’s Materials and Manufacturing Directorate.
“However, it is far from finished. On-going efforts will prove the technology on multiple representative aircraft structures and prototype a fiber optic delivery system to increase device reach.”
Future work in this technology area includes analyzing data for bond integrity in the field. Tests also need to be done to define a wider gamut of materials, thicknesses, and joint designs so the technology can be expanded to other platforms. Additionally, hardware improvements must be made to the laser bond inspection unit for usability in a manufacturing environment.
Published: Tuesday, February 20, 2018 @ 9:05 PM
PYEONGCHANG, South Korea — Vice President Mike Pence was ready for a secret meeting with North Korean officials at the 2018 Winter Olympics in Pyeongchang, South Korea, earlier this month, but the North backed out, according to news outlets.
Pence attended the Olympics Opening Ceremony on Feb. 9 as part of a five-day trip to Asia and was seated near Kim Jong-un’s sister, but did not speak to her, creating a media sensation.
The North canceled the meeting just two hours before Pence was scheduled to meet with Kim Jong-un’s sister, Kim Yo Jong, and another North Korean state official, Kim Yong Nam, on Feb. 10 after Pence announced new sanctions against the North Korean regime during his trip and rebuked it for its nuclear program, according to the Washington Post, which was the first to report on the secret meeting.
“North Korea dangled a meeting in hopes of the vice president softening his message, which would have ceded the world stage for their propaganda during the Olympics,” the vice president’s chief of staff, Nick Ayers, said in a statement, according to The Hill.
State Dept: Pence planned to meet with North Koreans to "drive home the necessity" of abandoning nuclear/ missile programs, but North Korea pulled out "at the last minute."https://t.co/CdVuTVpoZA— Axios World (@AxiosWorld) February 21, 2018
News of the secret meeting comes as relations between the communist north and democratic south seem to be thawing in recent weeks with the announcement last month from Kim Jong-un that he was sending a delegation to the Olympics. He sent his sister to lead the group.
“We regret [the North Koreans'] failure to seize this opportunity," State Department spokesperson Heather Nauert said in a statement. "We will not apologize for American values, for calling attention to human rights abuses, or for mourning a young American’s unjust death."
Pence said he planned to use his trip to the Olympics to prevent North Korea from using the games as a ploy for favorable propaganda on the communist regime.
From the State Dept: Pence agreed to a secret meeting with North Korean officials at the Winter Olympics -- North Korea cancelled at the last minute pic.twitter.com/mVuSTDuUB6— Matt Marohl (@mattmarohl) February 21, 2018
Published: Tuesday, February 20, 2018 @ 5:16 PM
Updated: Tuesday, February 20, 2018 @ 9:16 PM
SPRINGFIELD — UPDATE @ 8:44 p.m.:
The gun found in an 8-year-old’s book bag at Simon Kenton Elementary School was discovered at the end of the day before dismissal, according to Superintendent Dr. Robert Hill.
“As a parent and as a resident, you wonder if it’s safe to send your children to school and if they will return safely,” Nina Wiley of Springfield said to News Center 7’s James Buechele about the incident Tuesday.
UPDATE @ 7:36 p.m.:
The 8-year-old student who brought a gun to school in his book bag will face discipline in accordance with Springfield City School Districts student code of conduct, according to Superintendent Dr. Robert Hill.
Hill said he was proud of the staff at Simon Kenton for their quick response in ensuring the safety of the students.
A student at Simon Kenton Elementary School brought a gun to school in his book bag on Tuesday according to Springfield Police.
The 8-year-old told police that he thought another student was going to hurt him and that is why he had a gun. The gun was found unloaded by a teacher who was putting homework in the suspect’s backpack.
Police responded to Simon Kenton Elementary School at around 3:30 p.m. Tuesday and arrested the student in question. According to police the suspect will be charged with Illegal conveyance or possession of a deadly weapon in a school safety zone.
Published: Tuesday, February 20, 2018 @ 1:59 AM
PARKLAND, Fla. — The man allegedly behind the fatal Florida high school shooting apparently has a disturbing past that is coming to light. A school fight that was captured on camera a little more than a year ago is the latest development.
A September 2016 video shared by ABC News shows Cruz wearing a white shirt and khakis while fighting with other students. Cruz was reportedly handed a two-day suspension following the incident.
Another incident that reportedly contributed to Cruz’s expulsion was his alleged fight with his ex-girlfriend’s new boyfriend. Cruz was allegedly abusive toward her before they broke up.
Published: Tuesday, February 20, 2018 @ 7:16 AM
BOISE, Idaho — President Donald Trump took last place in a new survey that aims to measure "presidential greatness."
According to the results posted Monday by Boise State University, 170 political scientists participated in the 2018 Presidents and Executive Politics Presidential Greatness Survey. More than 57 percent of the respondents – current and recent members of the Presidents and Executive Politics Section of the American Political Science Association – were Democrats, while 13 percent were Republicans and 27 percent were Independents. Respondents gave each president a score of 0-100 for "overall greatness," then each president's scores were averaged.
So who took the No. 1 spot? Abraham Lincoln led the pack with a score of 95.03, followed by George Washington, Franklin Delano Roosevelt, Theodore Roosevelt, Thomas Jefferson, Harry Truman and Dwight Eisenhower. Those presidents' ranks remained unchanged from 2014.
2018 Presidential Greatness Survey— Judd Legum (@JuddLegum) February 19, 2018
4. T. Roosevelt
41. A. Johnson
43. Wm Harrison
Among recent presidents, Barack Obama fared the best, placing eighth with a score of 71.13. Ronald Reagan took the No. 9 spot, while Bill Clinton came in at No. 13, George H.W. Bush at No. 17, Jimmy Carter at No. 26 and George W. Bush at No. 30.
Trump ranked No. 44 – last place – with a score of 12.34. Among Republican respondents, he fared slightly better, coming in at No. 40.