CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

A nonlinear viscoelastic iceberg material model and its numerical validation

Chu Shi ; Zhiqiang Hu ; Jonas Ringsberg (Institutionen för sjöfart och marin teknik, Marin teknik) ; Yu Lou
Journal of Engineering for the Maritime Environment (1475-0902). Vol. 231 (2017), 2, p. 675-689.
[Artikel, refereegranskad vetenskaplig]

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.

Nyckelord: nonlinear viscoelasticity, iceberg material, numerical validation, laboratory scale, reality scale



Den här publikationen ingår i följande styrkeområden:

Läs mer om Chalmers styrkeområden  

Denna post skapades 2016-10-27. Senast ändrad 2017-07-06.
CPL Pubid: 244268

 

Läs direkt!


Länk till annan sajt (kan kräva inloggning)


Institutioner (Chalmers)

Institutionen för sjöfart och marin teknik, Marin teknik (2015-2017)

Ämnesområden

Materialvetenskap
Transport
Hållbar utveckling
Innovation och entreprenörskap (nyttiggörande)
Matematik
Teknisk mekanik
Farkostteknik
Materialteknik

Chalmers infrastruktur