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Research Papers: Polar and Arctic Engineering

On the Scalability of Model-Scale Ice Experiments

[+] Author and Article Information
Rüdiger U. Franz von Bock und Polach

Department of Applied Mechanics,
Aalto University,
Otakari 3,
Espoo 00076, Finland;
Department of Marine Technology,
Norwegian University of
Science and Technology,
Otto Nielsens veg 10,
Trondheim 7491, Norway
e-mail: ruediger.vonbock@aalto.fi

Sören Ehlers

Mem. ASME
Institute for Ship Structural Design and
Analysis (M-10),
Hamburg University of Technology (TUHH),
Am Schwarzenberg-Campus 4,
Hamburg 21073, Germany;
Department of Marine Technology,
Norwegian University of
Science and Technology,
Otto Nielsens veg 10,
Trondheim 7491, Norway
e-mail: ehlers@tuhh.de

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 10, 2014; final manuscript received July 17, 2015; published online August 12, 2015. Assoc. Editor: Hideyuki Suzuki.

J. Offshore Mech. Arct. Eng 137(5), 051502 (Aug 12, 2015) (8 pages) Paper No: OMAE-14-1121; doi: 10.1115/1.4031114 History: Received September 10, 2014

Ice model tests are a frequently used mean to assess and predict the performance of ships and structures in ice. The model ice composition is adjusted to comply with Froude and Cauchy similitude. Recent research indicates that the internal mechanics of Aalto model-scale ice and sea ice differ significantly. This consequently limits the scalability and challenges state-of-the-art scaling procedures. This paper presents a qualitative assessment on selected topics to assess the differences between model-scale ice and sea ice and the influence of related experiments on determined mechanical properties. Furthermore, existing scaling approaches are discussed in context of recent research findings.

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Figures

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Fig. 1

Brine inclusions in sea ice [22]

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Fig. 2

Thin section of sea ice (Baltic Sea 2012), possible irregularities are highlighted

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Fig. 3

Stress–strain relationship for Aalto model-scale ice in compression using elastic, elasto-plastic, and elasto-plastic incl. damage material models

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Fig. 9

Compressive model ice test with failed specimen at Aalto Ice Tank

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Fig. 8

Force–displacement curve of different compressive model ice specimen

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Fig. 7

Compressive full scale measurement results from Ref. [31]

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Fig. 6

Comparison of the analytically calculated and numerically computed maximum tensile stresses from numerical beam bending experiments. The length refers to the distance between load and failure.

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Fig. 5

Cantilever beam tests at Aalto Ice Tank

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Fig. 4

Force–displacement plots of cantilever beam experiments at a bending strength of 59 kPa together with linear elastic simulations of two different elastic moduli

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Fig. 10

Compressive tests at Aalto Ice Tank with model-scale ice with different width/thickness ratios

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Fig. 11

Numerical compressive stress as function with varying width/thickness ratio

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Fig. 12

Top view on numerical cantilever beam experiment with stress concentrations at the root

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