Establishment and Verification of a Constitutive Model of Ice Material Considering the Effect of Temperature

Tongqiang Yu,Jiaxia Wang,Zili Wang,Kun Liu

doi:10.3390/jmse8030193

Tongqiang Yu, Jiaxia Wang + Show 2 more

Open Access

https://doi.org/10.3390/jmse8030193

Copy DOI

Abstract

The increase in global warming has secured the arctic region as a research hotspot, and the existence of ice floes and massive icebergs poses a great challenge to the navigational safety of polar ships. For the finite simulation of ship–ice collisions, a reasonable description of the ice constitutive model is the most important factor for the accuracy of ice load prediction and structural deformation assessment. Due to the complex physical properties of natural sea ice materials, there are still many difficulties in achieving a widely accepted ice material model. In this paper, a constitutive model of ice material considering the influence of temperature is established and embedded into finite element software LS-DYNA, and the material property parameters are validated and analyzed. Then, the drop test in a published paper is recapitulated by the numerical simulation with the proposed method, and the results are compared. Good agreement is attained between the numerical simulation and published results. The influences of temperature and drop height are discussed, and the results show that both of them have an important effect on structural deformation. The research results can be used for ice load prediction and polar ship structure design.

Highlights

The vast arctic waters are currently the largest area with undiscovered oil and gas reserves on earth, and the actual proven reserves are equivalent to 10% of the currently known petroleum resources [1]
An ice material constitutive model considering the influence of temperature is proposed, and the corresponding LS-DYNA material subroutine is established
The ice material constitutive model proposed in this paper can effectively simulate the ice load under collision and correctly reflect the three-dimensional compressive strength characteristics of ice materials

Summary

Introduction

The vast arctic waters are currently the largest area with undiscovered oil and gas reserves on earth, and the actual proven reserves are equivalent to 10% of the currently known petroleum resources [1]. With the development of testing technology, triaxial compression tests have been carried out, and the three-dimensional mechanical characteristics of sea ice are intuitively and comprehensively reflected, which provides effective data support for numerical simulations [11,12,13]. Hardened foam materials and other similar brittle materials have been used in the simulation of sea ice materials [17,18], which is convenient and fast but cannot fully reflect the actual physical properties of ice. In recent years, based on reliable test data, user-defined constitutive subroutines have been developed and applied to ship-ice collision scenarios [19,20,21], which have been improved as a feasible and effective method. The research results in this paper can be used for ice load prediction and polar ship structure design

Ice Material Model Considering the Temperature Effects

Stress Update Algorithm

Effect on the Temperature of the Ice Block

Effect of the Drop Height of the Ice Block

Findings

Conclusions