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Laboratory experiments with a laser-based attachment mechanism for spacecraft at small bodies
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology.
Luleå University of Technology, Department of Engineering Sciences and Mathematics, Product and Production Development.ORCID iD: 0000-0003-4265-1541
Department of Physics, University of Helsinki, P.O. Box 64, 00014, Finland.
Luleå University of Technology, Department of Computer Science, Electrical and Space Engineering, Space Technology. Department of Physics, University of Helsinki, P.O. Box 64, 00014, Finland.ORCID iD: 0000-0002-5624-1888
2021 (English)In: Acta Astronautica, ISSN 0094-5765, E-ISSN 1879-2030, Vol. 189, p. 391-397Article in journal (Refereed) Published
Abstract [en]

We present the results of two sets of experiments that investigate laser-based metal-to-rock attachment techniques. Asteroids and comets have low surface gravity which pose a challenge to landers with moving parts. Such parts can generate torques and forces which may tip the lander over or launch it into deep space. Thus, if a lander on a small body is to have moving parts, the spacecraft must be equipped with an anchoring mechanism. To this end, we sought to use a laser to melt and bind a piece of metal mimicking a part of a spacecraft to a rock mimicking the surface of a typical asteroid. In the first set of experiments, extra material was not fed in during the processing. The second set were performed using a standard wire feeder used in laser welding, which added metal to the experiment during processing. During the first experiments, we discovered that a traditional weld, where two melt pools mix and solidify to form a strong bond, was not possible—the melt pools would not mix, and when they did, the resulting weld was extremely brittle. The second set of experiments resulted in a physico-mechanical bond, where a hole was drilled with a laser, and a wire was melted and fed into the hole. These latter experiments were successful in forming bonds as strong as 115 N. Such an attachment mechanism can also be used to maneuver small boulders on asteroid surfaces, to redirect small, monolithic asteroids, or in space-debris removal.

Place, publisher, year, edition, pages
Elsevier, 2021. Vol. 189, p. 391-397
Keywords [en]
Spacecraft anchoring, Laser drilling, High-speed imaging, X-ray micro-tomography, Asteroid mining
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Astronomy, Astrophysics and Cosmology
Research subject
Manufacturing Systems Engineering; Onboard space systems
Identifiers
URN: urn:nbn:se:ltu:diva-86924DOI: 10.1016/j.actaastro.2021.08.028ISI: 000703817900035Scopus ID: 2-s2.0-85114802051OAI: oai:DiVA.org:ltu-86924DiVA, id: diva2:1589372
Funder
Knut and Alice Wallenberg Foundation
Note

Validerad;2021;Nivå 2;2021-09-14 (beamah)

Available from: 2021-08-31 Created: 2021-08-31 Last updated: 2021-12-13Bibliographically approved

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Anthony, NiklasFrostevarg, JanGranvik, Mikael

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