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dc.contributor.authorMichikami, Tatsuhiroen_UK
dc.contributor.authorHagermann, Axelen_UK
dc.contributor.authorTsuchiyama, Akiraen_UK
dc.contributor.authorYamaguchi, Hirotakaen_UK
dc.contributor.authorIrie, Terunorien_UK
dc.contributor.authorNomura, Keitaen_UK
dc.contributor.authorSasaki, Osamuen_UK
dc.contributor.authorNakamura, Michihikoen_UK
dc.contributor.authorOkumura, Satoshien_UK
dc.contributor.authorHasegawa, Sunaoen_UK
dc.description.abstractSmall asteroids such as Itokawa are covered with an unconsolidated regolith layer of centimeter-sized or smaller particles. There are two plausible formation mechanisms for regolith layers on a sub-kilometer-sized asteroid: (i) fragments produced by thermal fatigue by day-night temperature cycles on the asteroid surface and (ii) impact fragment. Previous studies suggest that thermal fatigue induces crack growth along the boundary surface of the mineral grain while impact phenomena may induce crack growth regardless of the boundary surface of the mineral grain. Therefore, it is possible that the crack growth within a mineral grain (and/or a chondrule) differs depending on the crack formation mechanism, be it thermal fatigue or an impact. In order to investigate how mineral grains and chondrules are affected by impact-induced crack growth, we fired spherical alumina projectiles (diameter ~1 mm) into 9 mm side length cubic targets of L chondrites at a nominal impact velocity of 2.0 km/s. Before and after the six successful impact experiments, the cracks within mineral grains and chondrules in the respective targets are examined using X-ray microtomography at a resolution with the voxel size of 9.0 μm. The results show that most cracks within chondrules and troilite (FeS) grow regardless of the boundary surfaces of the grains while most cracks within ductile Fe-Ni metal grow along the boundary surfaces of the grains. This may indicate that crack growth is largely affected by the strength of mineral grains (and/or chondrules). From the experimental results and the fact that the shapes of polymineralic and monomineralic particles from Itokawa are similar, we conclude that the Itokawa particles have not been produced by thermal fatigue but instead are likely to be impact fragments, as described in previous papers (Tsuchiyama et al., 2011, 2014; Michikami et al., 2018).en_UK
dc.relationMichikami T, Hagermann A, Tsuchiyama A, Yamaguchi H, Irie T, Nomura K, Sasaki O, Nakamura M, Okumura S & Hasegawa S (2019) Three-dimensional imaging of crack growth in L chondrites after high-velocity impact experiments. Planetary and Space Science, 177, Art. No.: 104690.
dc.rightsThis article is available under the terms of the Creative Commons Attribution License (CC BY). You may copy and distribute the article, create extracts, abstracts and new works from the article, alter and revise the article, text or data mine the article and otherwise reuse the article commercially (including reuse and/or resale of the article) without permission from Elsevier. You must give appropriate credit to the original work, together with a link to the formal publication through the relevant DOI and a link to the Creative Commons user license above. You must indicate if any changes are made but not in any way that suggests the licensor endorses you or your use of the work.en_UK
dc.subjectCrack growthen_UK
dc.subjectL chondriteen_UK
dc.subjectX-ray microtomographyen_UK
dc.subjectLaboratory impact experimentsen_UK
dc.titleThree-dimensional imaging of crack growth in L chondrites after high-velocity impact experimentsen_UK
dc.typeJournal Articleen_UK
dc.citation.jtitlePlanetary and Space Scienceen_UK
dc.type.statusVoR - Version of Recorden_UK
dc.contributor.funderSTFC Science & Technology Facilities Councilen_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationBiological and Environmental Sciencesen_UK
dc.contributor.affiliationRitsumeikan Universityen_UK
dc.contributor.affiliationKyoto Universityen_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationKindai Universityen_UK
dc.contributor.affiliationTohoku Universityen_UK
dc.contributor.affiliationTohoku Universityen_UK
dc.contributor.affiliationTohoku Universityen_UK
dc.contributor.affiliationJapan Aerospace Exploration Agencyen_UK
dc.description.refREF Compliant by Deposit in Stirling's Repositoryen_UK
dc.relation.funderprojectHagermann Consolidated Grants: Make or Break & Comets in the laboratoryen_UK
Appears in Collections:Biological and Environmental Sciences Journal Articles

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