It’s hard to believe that anything could have been done cheaply to save costs on the NASA space shuttle. Yet that appears to be exactly the case with the insulation problems that have been plaguing recent flights. On Friday, cracked insulation was found on all three of the fuel tanks scheduled for upcoming flights. And the cracks have probably been there a while.
Cracks are appearing in foam-covered cork insulation that is applied to aluminum alloy brackets. The brackets, which are 17 inches long and four inches wide when foamed, support the liquid oxygen feedline on the external fuel tank. The cork prevents ice from forming on the brackets. Super-cold fuel is inside the tank. Engineers are now finally developing a better solution—replacement of the aluminum alloy with titanium. For the next shuttle flight, the foam and high-density cork insulation will be removed and replaced with foam only. The titanium parts will be ready by spring.
Bad materials engineering has been one of the banes of the space shuttle program. And the problems have not exactly been rocket science. The most famous, or course, was the O-ring failure that led to the disintegration of the Challenger in 1986. It was well known that the fluoroelastomeric materials in the O-rings had extremely poor low-temperature capabilities. Once compressed, very cold O-rings take time to return to their normal shape. Temperatures were very cold the night before the Challenger launch, but temperatures at launch time were within allowable guidelines. Because of poor communications, the problems with the O-ring materials’ properties were not adequately known, and the launch proceeded. O-ring joints now have on-board heaters that are turned on when temperatures drop below 50F.
Inspired by the hooks a parasitic worm uses to penetrate its host's intestines, the Karp Lab has invented a flexible adhesive patch covered with microneedles that adheres well to wet, soft tissues, but doesn't cause damage when removed.
Researchers at the Missouri University of Science & Technology have designed a new nanoscale material that can transmit light faster than the 186,000 miles per second it usually takes to travel through air.
It has often been said that as California goes, so goes the nation. This spring, the state's wind power is setting energy generation records and solar energy generation is expected to rise sharply during the second half of 2013.
A quick look into the merger of two powerhouse 3D printing OEMs and the new leader in rapid prototyping solutions, Stratasys. The industrial revolution is now led by 3D printing and engineers are given the opportunity to fully maximize their design capabilities, reduce their time-to-market and functionally test prototypes cheaper, faster and easier. Bruce Bradshaw, Director of Marketing in North America, will explore the large product offering and variety of materials that will help CAD designers articulate their product design with actual, physical prototypes. This broadcast will dive deep into technical information including application specific stories from real world customers and their experiences with 3D printing. 3D Printing is