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Citation:
　Chu Shi,Zhiqiang Hu,Yu Luo.An Elastic-Plastic Iceberg Material Model Considering Temperature Gradient Effects and its Application to Numerical Study[J].Journal of Marine Science and Application,2016,(4):370-375.[doi:10.1007/s11804-016-1384-4]
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An Elastic-Plastic Iceberg Material Model Considering Temperature Gradient Effects and its Application to Numerical Study

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Title:
An Elastic-Plastic Iceberg Material Model Considering Temperature Gradient Effects and its Application to Numerical Study
Author(s):
Chu Shi1; 2;  Zhiqiang Hu1; 2;  Yu Luo1; 2
Affilations:
Author(s):
Chu Shi1; 2;  Zhiqiang Hu1; 2;  Yu Luo1; 2
1. State Key Laboratory of Ocean Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;
2. Collaborative Innovation Center for Advanced Ship and Deep-Sea Exploration, Shanghai Jiao Tong University, Shanghai 200240, China
Keywords:
iceberg material model|FPSO-iceberg collision|temperature gradient|numerical simulation|iceberg shape|failure criteria
分类号:
-
DOI:
10.1007/s11804-016-1384-4
Abstract:
To simulate the FPSO-iceberg collision process more accurately, an elastic-plastic iceberg material model considering temperature gradient effects is proposed and applied. The model behaves linearly elastic until it reaches the ‘Tsai-Wu’ yield surfaces, which are a series of concentric elliptical curves of different sizes. Decreasing temperature results in a large yield surface. Failure criteria, based on the influence of accumulated plastic strain and hydrostatic pressure, are built into the model. Based on published experimental data on the relationship between depth and temperature in icebergs, three typical iceberg temperature profiles are proposed. According to these, ice elements located at different depths have different temperatures. The model is incorporated into LS-DYNA using a user-defined subroutine and applied to a simulation of FPSO collisions with different types of icebergs. Simulated area-pressure curves are compared with design codes to validate the iceberg model. The influence of iceberg shape and temperature on the collision process is analyzed. It is indicated that FPSO structural damage not only depends on the relative strength between the iceberg and the structure, but also depends on the local shape of the iceberg.

References:

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Memo

Memo:
Received date:2016-6-7;Accepted date:2016-7-27。
Foundation item:Supported by the National Natural Science Foundation of China under Grant No. 51239007
Corresponding author:Zhiqiang Hu
Last Update: 2016-11-24