Ice crushing tests with variable structural flexibility

Määttänen, Mauri; Marjavaara, Pieti; Saarinen, Sami; Laakso, Matti

doi:10.1016/j.coldregions.2011.03.004

Cited by 36 publications

(25 citation statements)

References 3 publications

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“…The 100 Hz sampling frequency of the tactile sensor is a constraint in the sense that local, high-frequency processes at the ice-structure interface cannot be observed. Time attenuation is observed in the tactile sensor data, and the error seems to be velocity dependent during crushing; see Määttänen et al (2011) for further discussion on the tactile sensor limitations. Despite the difficulties with the tactile sensor, the data and the optimal joint estimates provide a strong means of studying the dual state and interfacial process.…”

Section: Joint Force Response and Pressure Analysismentioning

confidence: 95%

See 1 more Smart Citation

Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities

Nord

Lourens

Määttänen

et al. 2015

Cold Regions Science and Technology

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Section: Joint Force Response and Pressure Analysismentioning

confidence: 95%

“…It covered a 216 degree angle, enabling the full contact to be measured. Prior experience with this instrumentation ensured that the local pressures were not smeared out beyond the sensel area (Määttänen et al, 2011). Brackets on the backside of the indenter were used to distribute the pressure (Fig.…”

Section: Sensor Types Positions and Data Acquisitionmentioning

confidence: 99%

Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities

Nord

Lourens

Määttänen

et al. 2015

Cold Regions Science and Technology

Self Cite

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“…In earlier experimental works (i.e., Gagnon [14], [15], see overview in Timco [16] and Duthinh et al [17]) the structure was rigid compared to the striking ice masses. In Määtänen et al [18], panels with variable compliance were used and deformations of the panels were small. In Frederking et al [19] and Daley [20], ice indentation experiments with flexible flat indenters are mentioned, but data are limited (especially a description of damage caused by the ice).…”

Section: Introductionmentioning

confidence: 99%

Design and Modelling of Accidental Ship Collisions With Ice Masses at Laboratory-Scale

Kim

Storheim

Polach

et al. 2012

Volume 6: Materials Technology; Polar and Arctic Sciences and Technology; Petroleum Technology Symposium

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Knowledge about the level of damage after a collision with an ice mass is necessary for designing ships and offshore structures operating in ice-infested waters. An understanding of the physical processes during such a collision is needed to prevent (or limit) accidents, causing loss of life, the loss of a ship or environmental pollution. This study was motivated by the lack of experimental data on ship collisions with ice masses where both the ship and the structure undergo deformations. Laboratory experiments of accidental collisions with ice masses (ACIM) are essential to verify current methods for integrated analysis of the crushing and deformation of the ice and the steel structure. ACIM tests are sensitive to the structural design, i.e., the design of a structure that is flexible enough in relation to the ice mass. Both the ice and the structure should be able to deform during the collision event. The paper addresses issues related to the planning of ACIM at laboratory scale with special emphasis on the choice of: (i) process of ice manufacturing and ice mechanical properties; (ii) flexibility of impacted structure; (iii) scaling of the experiment. Experimental setup of laboratory-scale ACIM for the Aalto Ice Tank is proposed. Non-linear finite element analysis is used as a tool to predict structural damage and to guide the planning of collision experiments. The predicted damage of the test specimens caused by collision is presented.

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“…Many studies have been carried out to investigate the interaction between ice and cylindrical or sloped structures by model tests, full-scale tests and numerical simulations [9][10][11][12][13][14]. Yue et al conducted full-scale tests on a cylindrical compliant monopod platform to investigate the dynamic ice forces and structure vibrations generated by crushing failure of the ice sheet [15].…”

Section: Introductionmentioning

confidence: 99%

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

Song

Ren

Zhou

2019

JMSE

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In this paper, the interaction between level ice and wind turbine tower is simulated by the explicit nonlinear code LS-DYNA. The isotropic elasto-plastic material model is used for the level ice, in which ice crushing failure is considered. The effects of ice mesh size and ice failure strain on ice forces are investigated. The results indicate that these parameters have a significant effect on the ice crushing loads. To validate and benchmark the numerical simulations, experimental data on level ice-wind turbine tower interactions are used. First, the failure strains of the ice models with different mesh sizes are calibrated using the measured maximum ice force from one test. Next, the calibrated ice models with different mesh sizes are applied for other tests, and the simulated results are compared to corresponding model test data. The effects of the impact speed and the size of wind turbine tower on the comparison between the simulated and measured results are studied. The comparison results show that the numerical simulations can capture the trend of the ice loads with the impact speed and the size of wind turbine tower. When a mesh size of ice model is 1.5 times the ice thickness, the simulations can give more accurate estimations in terms of maximum ice loads for all tests, i.e., good agreement between the simulated and measured results is achieved.

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Ice crushing tests with variable structural flexibility

Cited by 36 publications

References 3 publications

Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities

Laboratory experiments to study ice-induced vibrations of scaled model structures during their interaction with level ice at different ice velocities

Design and Modelling of Accidental Ship Collisions With Ice Masses at Laboratory-Scale

Numerical Study of the Interaction between Level Ice and Wind Turbine Tower for Estimation of Ice Crushing Loads on Structure

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