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Meteorite Material Model for Structural Properties
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Author and Affiliation:
Agrawal, Parul(Analytical Mechanics Associates, Inc., Moffett Field, CA, United States)
Carlozzi, Alexander A.(Lockheed Martin Corp., Sunnyvale, CA, United States)
Karajeh, Zaid S.(Universities Space Research Association, Moffett Field, CA, United States)
Bryson, Kathryn L.(Bay Area Environmental Research Inst., Moffett Field, CA, United States)
Abstract: To assess the threat posed by an asteroid entering Earth's atmosphere, one must predict if, when, and how it fragments during entry. A comprehensive understanding of the asteroid material properties is needed to achieve this objective. At present, the meteorite material found on earth are the only objects from an entering asteroid that can be used as representative material and be tested inside a laboratory setting. Due to complex petrology, it is technically challenging and expensive to obtain reliable material properties by means of laboratory test for a family of meteorites. In order to circumvent this challenge, meteorite unit models are developed to determine the effective material properties including Youngs modulus, compressive and tensile strengths and Poissons ratio, that in turn would help deduce the properties of asteroids. The meteorite unit is a representative volume that accounts for diverse minerals, porosity, cracks and matrix composition. The Youngs Modulus and Poissons Ratio in the meteorite units are calculated by performing several hundreds of Monte-Carlo simulations by randomly distributing the various phases inside these units. Once these values are obtained, cracks are introduced in these meteorite units. The size, orientation and distribution of cracks are derived by extensive CT-scans and visual scans of various meteorites from the same family. Subsequently, simulations are performed to attain stress-strain relations, strength and effective modulus values in the presence of these cracks. The meteorite unit models are presented for H, L and LL ordinary chondrites, as well as for terrestrial basalt. In the case of the latter, data from the simulations is compared with experimental data to validate the methodology. These material models will be subsequently used in fragmentation modeling of full scale asteroids.
Publication Date: Oct 15, 2017
Document ID:
20170011543
(Acquired Dec 11, 2017)
Subject Category: GEOPHYSICS
Report/Patent Number: ARC-E-DAA-TN45086
Document Type: Conference Paper
Meeting Information: Annual AAS Division for Planetary Sciences Meeting ; 49th; 15-20 Oct. 2017; Provo, UT; United States
Meeting Sponsor: American Astronomical Society; Washington, DC, United States
Contract/Grant/Task Num: NNA15BB15C; NNX13AJ38A; NNX14AR61A
Financial Sponsor: NASA Ames Research Center; Moffett Field, CA, United States
Organization Source: NASA Ames Research Center; Moffett Field, CA, United States
Description: 1p; In English
Distribution Limits: Unclassified; Publicly available; Unlimited
Rights: Copyright; Public use permitted
NASA Terms: METEORITES; SIZE DISTRIBUTION; CHONDRITES; FRAGMENTATION; MODULUS OF ELASTICITY; PETROLOGY; ASTEROIDS; STRESS-STRAIN RELATIONSHIPS; POISSON RATIO; SIMULATION; FRAGMENTS; MINERALS; POROSITY
Other Descriptors: METEORITE; MATERIAL; MODEL; STRUCTURAL PROPERTIES
Availability Notes: Abstract Only
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Last Modified: December 11, 2017
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