Projects per year
Abstract
A threedimensional finite elementdiscrete element model of an ice sheet is presented. The model consists of an inplane beam lattice of corotational, viscously damped Timoshenko beam finite elements connected with the mass centroids of rigid discrete elements that form the actual ice sheet. A sheet is generated and meshed via a centroidal Voronoi tessellation procedure. Due to the internally damped, latticebased construction, the mechanical response becomes both strain rate and sizedependent, the examination of which forms a central part of the present study. Four displacementcontrolled, inplane, constitutive tests are thus performed to compute the effective, quasistatic, inplane Young's (in tension and compression); shear (in simple shear); and bulk (in equibiaxial tension) moduli E,G, and K, respectively, of a modelled ice sheet. Examined is a set of square, selfsimilar (plan view) ice sheet samples with the side lengths of L=10, 20, 40, 80, and 160 m; thicknesses of h=0.5, 1.0, and 1.5 m; and the discrete element sizes of l=2h and 3h. The moduli are computed as functions of a relative sheet size parameter L_{rel} (L_{rel}=L/l) and the applied strain rate. The results indicate that the samples exhibit a moderately strong size dependence, whereas the strain rate has only a minor effect. In each test the size effect approximately vanishes if the relative sheet size parameter L_{rel}⪆25.
Original language  English 

Article number  106107 
Number of pages  19 
Journal  Computers and Structures 
Volume  224 
Early online date  9 Sep 2019 
DOIs  
Publication status  Published  Nov 2019 
MoE publication type  A1 Journal articlerefereed 
Keywords
 Beam lattice network
 Centroidal Voronoi tessellation
 Effective material properties
 Finite elementdiscrete element method
 Ice
 Size effect
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Projects
 2 Finished

ICESCALE: Scaling of Ice Strength: Measurements and Modeling
Kantola, K., Forsström, A. & Polojärvi, A.
03/11/2015 → 31/12/2018
Project: Business Finland: Other research funding

ARAJÄÄ: Arktisten rakenteiden jääkuormat: mallikokeista teollisuuden mittakaavaan (ARAJÄÄ)
El Gharamti, I., Forsström, A., Taimuri, G., Kulovesi, J., Polojärvi, A. & Lemström, I.
01/09/2015 → 31/03/2019
Project: Business Finland: Other research funding