NASA's Mark Hilburger prepares to buckle an
aluminum-lithium cylinder about the size of fuel tank barrels for the largest
rockets ever built. The black and white dots on the upper portion of the tank
helped 20 high-speed cameras record minute changes in the tank as almost a
million pounds of force pressed down upon the tank in a test at NASA's Marshall
Space Flight Center.
Image Credit: NASA/Fred Deaton
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NASA completed a series of high-tech can-crushing tests last week as an
enormous fuel tank crumbled under the pressure of almost a million pounds of
force, all in the name of building lighter, more affordable rockets.
During the testing for the Shell Buckling Knockdown Factor Project, which
began Dec. 9 at NASA's Marshall Space Flight Center in Huntsville, Ala., force
and pressure were increasingly applied to the top of an empty but pressurized
rocket fuel tank to evaluate its structural integrity. The resulting data will
help engineers design, build and test the gigantic fuel tanks for the Space
Launch System (SLS) rocket NASA is developing for deep space missions.
"These full-scale tests along with our computer models and subscale tests
will help NASA and industry design lighter, more affordable launch vehicles,"
said Mark Hilburger, senior research engineer in the Structural Mechanics and
Concepts Branch at NASA's Langley Research Center in Hampton, Va. Hilburger is
conducting the tests for the NASA Engineering and Safety Center. "We were
looking at real-time data from 20 cameras and more than 800 sensors during the
final test."
The aluminum-lithium tank was made from unused space shuttle tank hardware
and decked out in 70,000 black and white polka dots that helped high-speed
cameras focus on any buckles, rips or strains.
"When it buckled it was quite dramatic," Hilburger said. "We heard the bang,
almost like the sound of thunder and could see the large buckles in the test
article."
Engineers are updating design guidelines that have the potential to reduce
launch vehicle weight by 20 percent. Lighter rockets can carry more equipment
into space or travel farther away from Earth for exploration missions to
asteroids, Mars or other distant locations.
"In addition to providing data for the Space Launch System design team, these
tests are preparing us for upcoming full-scale tests," said Matt Cash,
Marshall's lead test engineer for the shell buckling efforts and the SLS forward
skirt and liquid oxygen tank structural testing. "Performing structural tests on
hardware that is the same size as SLS hardware is providing tremendous benefit
for our future development work for the rocket."
The testing was conducted at Marshall's load test annex, part of the
Structural and Dynamics Engineering Test Laboratory previously used to test
large structures for the Saturn V rocket, space shuttle and International Space
Station.
NASA's Space Launch System will provide an entirely new capability for human
exploration beyond Earth orbit. Designed to be flexible for crew or cargo
missions, the SLS will be safe, affordable and sustainable to continue America's
journey of discovery from the unique vantage point of space. SLS will carry the
Orion spacecraft's crew to deep space destinations including an asteroid and
eventually Mars.
For images and video of the big crush and to learn more about the shell
buckling project, visit:
For more information about NASA's Space Launch System, visit:
NASA
Guillermo Gonzalo Sánchez Achutegui
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