On the scalability of model-scale ice experiments

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

Researchers

  • Rüdiger U Franz Von Bock und Polach
  • Sören Ehlers

Research units

  • Norwegian University of Science and Technology

Abstract

Ice model-scale tests are a frequently used mean to assess and predict the performance of ships and structures in ice. However, ice model-scale tests may not be treated as a blackbox where any full-scale scenario can be tested and a Froude-scalable result is obtained. Prior to scaling a thorough analysis of the physical processes is required and whether they can be transferred to full-scale. Model-scale ice is an empirically developed compound-material, consisting of frozen water, voids of air and other artificial dopants. The model ice manufacturing process and dopant amounts have been adjusted to achieve Froude-scalability for the ice thickness and certain force response levels, i.e. ice resistance tests of ships breaking ice in the bending mode. However, not much is known about the internal mechanical processes of model-scale ice and how the scaled force levels are reached. This may add uncertainty to ice model tests and their application on new fields. Recent research indicated that the internal mechanics of model-scale ice and natural sea ice are different, which is also challenging some of the existing scaling approaches. Mechanical specimen tests in full-scale and model-scale are usually compared by stresses, i.e. relating the failure load to the cross-sectional properties. However, depending on the tests different stress combinations might lead to failure, such as different geometries and dimensions may cause qualitatively different stress distribution, which ultimately limits the comparability of the tests. Subsequently, this paper presents a qualitative assessment on selected topics to assess the differences of model-scale ice and natural ice and the influence of the specimen geometry. Furthermore, existing scaling approaches are discussed in context with recent research findings.

Details

Original languageEnglish
Title of host publicationPolar and Arctic Science and Technology
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Ocean, Offshore and Arctic Engineering
- San Francisco, United States
Duration: 8 Jun 201413 Jun 2014
Conference number: 33

Conference

ConferenceInternational Conference on Ocean, Offshore and Arctic Engineering
Abbreviated titleOMAE
CountryUnited States
CitySan Francisco
Period08/06/201413/06/2014

ID: 9846360