Dynamic Finite Element Predictions For Mars Sample Return Cellular Impact Test 4 PDF Download
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Author | : United States. National Aeronautics and Space Administration |
Publisher | : |
Total Pages | : |
Release | : 2003* |
Genre | : |
ISBN | : |
Download Dynamic Finite Element Predictions for Mars Sample Return Cellular Impact Test #4 ... Nasa Book in PDF, ePub and Kindle
Author | : Edwin L. Fasanella |
Publisher | : |
Total Pages | : 28 |
Release | : 2001 |
Genre | : Astrodynamics |
ISBN | : |
Download Dynamic Finite Element Predictions for Mars Sample Return Cellular Impact Test #4 Book in PDF, ePub and Kindle
The nonlinear, transient dynamic finite element code, MSC. Dytran, was used to simulate an impact test of an energy absorbing Earth Entry Vehicle (EEV) that will impact without a parachute. EEV's are designed to return materials from asteroids, comets, or planets for laboratory analysis on Earth. The EEV concept uses an energy absorbing cellular structure designed to contain and limit the acceleration of space exploration samples during Earth impact. The spherical shaped cellular structure is composed of solid hexagonal and pentagonal foam-filled cells with hybrid graphite-epoxy/Kevlar cell walls. Space samples fit inside a smaller sphere at the center of the EEV's cellular structure. Pre-test analytical predictions were compared with the test results from a bungee accelerator.
Author | : National Aeronautics and Space Administration (NASA) |
Publisher | : Createspace Independent Publishing Platform |
Total Pages | : 40 |
Release | : 2018-06-19 |
Genre | : |
ISBN | : 9781721257997 |
Download Dynamic Finite Element Predictions for Mars Sample Return Cellular Impact Test #4 Book in PDF, ePub and Kindle
The nonlinear finite element program MSC.Dytran was used to predict the impact pulse for (he drop test of an energy absorbing cellular structure. This pre-test simulation was performed to aid in the design of an energy absorbing concept for a highly reliable passive Earth Entry Vehicle (EEV) that will directly impact the Earth without a parachute. In addition, a goal of the simulation was to bound the acceleration pulse produced and delivered to the simulated space cargo container. EEV's are designed to return materials from asteroids, comets, or planets for laboratory analysis on Earth. The EEV concept uses an energy absorbing cellular structure designed to contain and limit the acceleration of space exploration samples during Earth impact. The spherical shaped cellular structure is composed of solid hexagonal and pentagonal foam-filled cells with hybrid graphite-epoxy/Kevlar cell walls. Space samples fit inside a smaller sphere at the enter of the EEV's cellular structure. The material models and failure criteria were varied to determine their effect on the resulting acceleration pulse. Pre-test analytical predictions using MSC.Dytran were compared with the test results obtained from impact test #4 using bungee accelerator located at the NASA Langley Research Center Impact Dynamics Research Facility. The material model used to represent the foam and the proper failure criteria for the cell walls were critical in predicting the impact loads of the cellular structure. It was determined that a FOAMI model for the foam and a 20% failure strain criteria for the cell walls gave an accurate prediction of the acceleration pulse for drop test #4. Fasanella, Edwin L. and Billings, Marcus D. Langley Research Center VTD-NR-01-04
Author | : Marcus Dwight Billings |
Publisher | : |
Total Pages | : 90 |
Release | : 2002 |
Genre | : Impact |
ISBN | : |
Download Analytical Simulations of Energy-Absorbing Impact Spheres for a Mars Sample Return Earth Entry Vehicle Book in PDF, ePub and Kindle
Author | : |
Publisher | : |
Total Pages | : 738 |
Release | : 2003 |
Genre | : Government publications |
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Download Monthly Catalog of United States Government Publications Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 166 |
Release | : 2002 |
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Download NASA Langley Scientific and Technical Information Output-2001 Book in PDF, ePub and Kindle
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Total Pages | : 312 |
Release | : 1992 |
Genre | : Aeronautics |
ISBN | : |
Download Scientific and Technical Aerospace Reports Book in PDF, ePub and Kindle
Author | : Michael E. Tauber |
Publisher | : |
Total Pages | : 44 |
Release | : 1989 |
Genre | : Aerodynamic heating |
ISBN | : |
Download A Review of High-speed, Convective, Heat-transfer Computation Methods Book in PDF, ePub and Kindle
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Publisher | : |
Total Pages | : 594 |
Release | : 2002 |
Genre | : Aeronautics |
ISBN | : |
Download 40th AIAA Aerospace Sciences Meeting & Exhibit Book in PDF, ePub and Kindle
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Total Pages | : 88 |
Release | : 1961-05 |
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Download Bulletin of the Atomic Scientists Book in PDF, ePub and Kindle
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.