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Försämrade materialegenskaper i aluminiumkonstruktioner - Liquid Metal Embrittlement inducerat av gallium
Swedish National Defence College.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Deteriorated material properties of aluminium structures – Liquid Metal Embrittlement induced by gallium (English)
Abstract [sv]

Denna studie undersöker möjligheten att påverka fientliga konstruktioner genom användandet av en effektiv metod, som kan medge en liten risk att upptäckas. Den tänkta påverkan uppnås genom fenomenet Liquid Metal Embrittlement (LME), med vilken höghållfasta metaller kan påverkas så mycket att de kollapsar av sin egenvikt. Uppsatsen studerar LME på ett ofta använt konstruktionsmaterial både civilt som militärt. Ett experiment genomfördes i syfte att undersöka effekterna av LME på en aluminiumlegering, där en aluminiumdetalj exponerades för metallen gallium. Förförsök genomfördes i syfte att undersöka inom vilka tidsförhållanden LME uppstod och experimentets exponeringstider planerades därefter. Efter varje exponeringstid genomfördes ett dragprov för att påvisa en minskad hållfasthet och seghet hos aluminiumet. Resultatet blev en stor minskning av hållfasthet och seghet, där hållfastheten sänktes till 20% av referensvärdet och segheten till 1% av referensvärdet, även om resultatet var spritt.

Abstract [en]

The possibility to damage enemy constructions using an efficient method, which might permit a low risk of detection, is studied in this thesis. This damage is based on the phenomena Liquid Metal Embrittlement (LME) with which high strength metals can be affected so much that they collapse under their own weight. This thesis studies this effect in a material often used for various constructions, both civilian and military. An experiment was conducted in order to evaluate the effects of LME on an aluminium alloy by exposing the aluminium to the metal known as gallium. A pre-experiment was made in order to determine how the time of exposure affected the LME-process and time-periods were decided accordingly. At each of the timeperiods a yield test was conducted in order to measure losses in strength and elasticity of the aluminium. It was shown that a great reduction in strength and elasticity occurred, where the strength was reduced to 20% of the reference sample and elasticity to 1% of the reference sample.

Place, publisher, year, edition, pages
2016. , 36 p.
Keyword [en]
Liquid Metal Embrittlement, Sabotage, Yield strength, Strength reduction, Tensile Strength, Elasticity, Gallium, Military System
Keyword [sv]
Försprödning, Infiltration, Tekniska System, Störa, Hållfasthet, Sträckgräns, Brottgräns, Aluminium
National Category
Materials Engineering Natural Sciences
Identifiers
URN: urn:nbn:se:fhs:diva-6208OAI: oai:DiVA.org:fhs-6208DiVA: diva2:941404
Subject / course
Militärteknik, självständigt arbete
Educational program
Officersprogrammet (OP)
Supervisors
Examiners
Available from: 2016-07-12 Created: 2016-06-22 Last updated: 2016-07-12Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
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  • vancouver
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More styles
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  • Other locale
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Output format
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