Dynamic Finite Element Predictions For Mars Sample Return Cellular Impact Test 4

Author : Edwin L. Fasanella
Publisher :
ISBN 13 :
Total Pages : 28 pages
Book Rating : 4.16/5 ( download)

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Download or read book Dynamic Finite Element Predictions for Mars Sample Return Cellular Impact Test #4 written by Edwin L. Fasanella and published by . This book was released on 2001 with total page 28 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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
ISBN 13 : 9781721264070
Total Pages : 40 pages
Book Rating : 4.78/5 ( download)

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Download or read book Dynamic Finite Element Predictions for Mars Sample Return Cellular Impact Test #4 written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-16 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. EEVOs 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 EEVOs cellular structure. Pre-test analytical predictions were compared with the test results from a bungee accelerator. The 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 FOAM1 model for the foam and a 20% failure strain criteria for the cell walls gave an accurate prediction of the acceleration pulse for cellular impact. Fasanella, Edwin L. and Billings, Marcus D. Langley Research Center NASA/TM-2001-211023, L-18087, NAS 1.15:211023, ARL-TR-2539

Author : Marcus Dwight Billings
Publisher :
ISBN 13 :
Total Pages : 90 pages
Book Rating : 4.87/5 ( download)

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Download or read book Analytical Simulations of Energy-Absorbing Impact Spheres for a Mars Sample Return Earth Entry Vehicle written by Marcus Dwight Billings and published by . This book was released on 2002 with total page 90 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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ISBN 13 :
Total Pages : 736 pages
Book Rating : 4.36/5 ( download)

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Author : National Aeronautics and Space Adm Nasa
Publisher : Independently Published
ISBN 13 : 9781723943249
Total Pages : 88 pages
Book Rating : 4.4X/5 ( download)

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Download or read book Analytical Simulations of Energy-Absorbing Impact Spheres for a Mars Sample Return Earth Entry Vehicle written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-23 with total page 88 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nonlinear dynamic finite element simulations were performed to aid in the design of an energy-absorbing impact sphere for a passive Earth Entry Vehicle (EEV) that is a possible architecture for the Mars Sample Return (MSR) mission. The MSR EEV concept uses an entry capsule and energy-absorbing impact sphere designed to contain and limit the acceleration of collected samples during Earth impact without a parachute. The spherical shaped impact sphere is composed of solid hexagonal and pentagonal foam-filled cells with hybrid composite, graphite-epoxy/Kevlar cell walls. Collected Martian samples will fit inside a smaller spherical sample container at the center of the EEV's cellular structure. Comparisons were made of analytical results obtained using MSC.Dytran with test results obtained from impact tests performed at NASA Langley Research Center for impact velocities from 30 to 40 m/s. Acceleration, velocity, and deformation results compared well with the test results. The correlated finite element model was then used for simulations of various off-nominal impact scenarios. Off-nominal simulations at an impact velocity of 40 m/s included a rotated cellular structure impact onto a flat surface, a cellular structure impact onto an angled surface, and a cellular structure impact onto the corner of a step.Billings, Marcus Dwight and Fasanella, Edwin L. (Technical Monitor)Langley Research CenterMARS SAMPLE RETURN MISSIONS; REENTRY VEHICLES; DEFORMATION; FINITE ELEMENT METHOD; COMPOSITE STRUCTURES; IMPACT TESTS; SPHERES; SIMULATION; PARTITIONS (STRUCTURES); NONLINEARITY; ATMOSPHERIC ENTRY; FLAT SURFACES; HYBRID COMPOSITES; IMPACT VELOCITY

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ISBN 13 :
Total Pages : 166 pages
Book Rating : 4.25/5 ( download)

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Download or read book NASA Langley Scientific and Technical Information Output-2001 written by and published by . This book was released on 2002 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt:

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ISBN 13 :
Total Pages : 312 pages
Book Rating : 4.04/5 ( download)

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ISBN 13 :
Total Pages : 594 pages
Book Rating : 4.37/5 ( download)

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ISBN 13 :
Total Pages : 88 pages
Book Rating : 4./5 ( download)

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Author : Michael E. Tauber
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ISBN 13 :
Total Pages : 44 pages
Book Rating : 4.99/5 ( download)

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Download or read book A Review of High-speed, Convective, Heat-transfer Computation Methods written by Michael E. Tauber and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: