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Tensile strength of dust-ice mixtures and their relevance as cometary analog material

Haack, David and Otto, Katharina A. and Gundlach, B. and Kreuzig, Christopher and Bischoff, Dorothea and Kührt, Ekkehard and Blum, J. (2020) Tensile strength of dust-ice mixtures and their relevance as cometary analog material. Astronomy & Astrophysics, 642, A218. EDP Sciences. doi: 10.1051/0004-6361/202037763. ISSN 0004-6361.

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Official URL: https://www.aanda.org/articles/aa/abs/2020/10/aa37763-20/aa37763-20.html

Abstract

Aims. The tensile strength of granular matter is of great importance to our understanding of the evolution of comets and to our attempts to reproduce processes on cometary surfaces in laboratory experiments. In this work, we investigate the tensile strength of three different materials and their mixtures, which can be used as cometary analog materials in the laboratory. Methods. We used two types of siliceous dusts and granular water ice whose polydisperse particles were either angular or spherical. Our samples were cooled to below 150 K to better simulate the conditions of a cometary surface and to avoid thermal alteration of the material. We used the Brazilian disk test method to exert stress on the cooled samples and determine the tensile strength at the moment the samples broke. Results. We find that the tensile strength of two component mixtures is strongly dominated by the component with the higher tensile strength. The materials made of mostly angular dust particles have a lower filling fraction, but a higher tensile strength compared to materials made of spherical particles. Furthermore, the tensile strength of the cooled components is substantially lower than the tensile strength of the same components at room temperature. This implies that the surface energy of the investigated materials at low temperatures is significantly lower than previously assumed.

Item URL in elib:https://elib.dlr.de/136317/
Document Type:Article
Title:Tensile strength of dust-ice mixtures and their relevance as cometary analog material
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Haack, DavidDavid.Haack (at) dlr.deUNSPECIFIED
Otto, Katharina A.Katharina.Otto (at) dlr.dehttps://orcid.org/0000-0002-0675-1177
Gundlach, B.institut für geophysik und extraterrestrische physik (igep), technische universität braunschweig, mendelssohnstr. 3, 38106 braunschweig, germanyUNSPECIFIED
Kreuzig, ChristopherInstitut fur Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig,Braunschweig, GermanyUNSPECIFIED
Bischoff, DorotheaInstitut für Geophysik und Extraterrestrische Physik, Technische Universität Braunschweig, Braunschweig, GermanyUNSPECIFIED
Kührt, EkkehardEkkehard.Kuehrt (at) dlr.deUNSPECIFIED
Blum, J.TU Braunschweig, GermanyUNSPECIFIED
Date:September 2020
Journal or Publication Title:Astronomy & Astrophysics
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:642
DOI :10.1051/0004-6361/202037763
Page Range:A218
Publisher:EDP Sciences
ISSN:0004-6361
Status:Published
Keywords:comets: general – methods: laboratory: solid state – planest and satellites: formation
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Space Exploration
DLR - Research theme (Project):Vorhaben asteroids and comets (old)
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geology
Deposited By: Haack, David
Deposited On:03 Dec 2020 13:05
Last Modified:03 Dec 2020 13:05

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