A nonlinear viscoelastic iceberg material model and its numerical validation
Journal article, 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

iceberg material

reality scale

Author

Chu Shi

Shanghai Jiao Tong University

ZhiQiang Hu

Shanghai Jiao Tong University

Newcastle University

Jonas Ringsberg

Chalmers, Shipping and Marine Technology, Marine Technology

Yu Lou

Shanghai Jiao Tong University

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

1475-0902 (ISSN)

Vol. 231 2 675-689

Chalmers Area of Advance Transport – funding 2017

Chalmers, 2017-01-01 -- 2017-12-31.

Subject Categories

Mechanical Engineering

Materials Engineering

Mathematics

Vehicle Engineering

Driving Forces

Sustainable development

Innovation and entrepreneurship

Areas of Advance

Transport

Materials Science

Roots

Basic sciences

DOI

10.1177/1475090216680907

More information

Latest update

10/11/2018