Compression tests of laboratory-made freshwater ice

The knowledge of the characteristics of ice is important for the construction of vessels and offshore structures, challenging ice in polar regions. In ice-structure-interactions, ice often fails under compression, but the mechanisms behind along with the properties caused by the formation process are not understood completely yet. To expand this knowledge, a number of uniaxial compression tests of three different fabrication methods of laboratory made freshwater ice have been conducted for this thesis to examine the influence of the inner structure on compressive strength values. After determining the most suitable fabrication procedure, the speed dependency of the compression strength and the failure modes of ice are analyzed and discussed by using the results of simple compression tests at different axial strain rates. For these tests, a newly installed experimental set-up in a separate cold room is used for the first time. The pressure measuring system TekScan coupled with a high-speed camera is called into action to determine the strength values and the failure modes. For the three investigated production methods significant structural and mechanical differences have been recorded. As observed in earlier research, some test series have a high degree of scattering strength values depending on the experimental speed. As a result none of the production methods shows promising results in terms of reproducibility. Nevertheless it has been possible to observe the speed dependence of the compression strength and the different failure modes based on one selected production method.

Subjects

ice

compression test

ductile failure

brittle failure

ductile-brittle transition

DDC Class

600: Technik

Lizenz

http://rightsstatements.org/vocab/InC/1.0/

Name

Project_Thesis_Robin_Haerer_March_2019.pdf

Size

97.23 MB

Format

Adobe PDF

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Compression tests of laboratory-made freshwater ice