A nonlinear viscoelastic iceberg material model and its numerical validation
Artikel i vetenskaplig tidskrift, 2017

This paper proposes a nonlinear viscoelastic iceberg material model. A nonlinear Burgers’ model in which Kelvin and Maxwell units are strain rate- and stress-dependent is adopted for the iceberg material. The strain rate effect is considered in this model based on the experimental results. The stress of the iceberg model grows linearly (in log form) with increasing strain rate before reaching the transition strain rate, after which the stress remains rather constant. A damage function that reflects microstructure changes and severe fractures in ice is adopted as the failure criterion. The iceberg model is implemented using a semi-implicit integration method and is incorporated in the commercial software LS-DYNA by a user-defined material. Laboratory-scale experiments, creep experiments and constant strain rate experiments, and reality-scale experiment, iceberg–rigid steel plate collisions, are simulated to validate the proposed iceberg material model. Simulated time–strain curves are compared with the results of creep experiments. In the constant strain rate experiments, the strain–stress curves for brittle and ductile failure and ultimate triaxial strength of the ice model are analysed. Area–pressure curves and contact force–displacement relations are investigated for different impact speeds in iceberg–steel plate collisions. Contact force is also studied in view of the kinetic energy of icebergs. The numerical results show that the proposed iceberg material model yields reasonably good results.

numerical validation

laboratory scale

nonlinear viscoelasticity

reality scale

iceberg material

Författare

Chu Shi

Shanghai Jiaotong University

ZhiQiang Hu

Shanghai Jiaotong University

Newcastle University, United Kingdom

Jonas Ringsberg

Chalmers, Sjöfart och marin teknik, Marin teknik

Yu Lou

Shanghai Jiaotong University

Proceedings of the Institution of Mechanical Engineers Part M: Journal of Engineering for the Maritime Environment

1475-0902 (ISSN)

Vol. 231 675-689

Ämneskategorier

Maskinteknik

Materialteknik

Matematik

Farkostteknik

Drivkrafter

Hållbar utveckling

Innovation och entreprenörskap

Styrkeområden

Transport

Materialvetenskap

Fundament

Grundläggande vetenskaper

DOI

10.1177/1475090216680907