Probabilistic modelling of the ultimate strength of ship plates with non-uniform corrosion
Probabilistic modelling of the ultimate strength of ship plates with non-uniform corrosion
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DOI：
10.1007/s00773-012-0197-7
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发表时间：
2013-03
影响因子：
2.6
通讯作者：
Â. Teixeira;C. Guedes Soares;G. Wang
中科院分区：
文献类型：
--
作者：
Â. Teixeira;C. Guedes Soares;G. Wang
本文介绍了用随机场表示的船舶非均匀腐蚀板极限强度概率模型的参数化研究结果。利用通用非线性有限元分析程序，得到了纵向压缩条件下腐蚀引起的非均匀减厚板的减载特性。基于散货船不同位置板件腐蚀实测数据，采用非线性时变腐蚀模型定义随机场的概率特征。基于蒙特卡罗模拟导出的概率模型，建立了非均匀腐蚀板极限强度均值和5%特征值的预测方程。最后，提出了一个考虑非均匀腐蚀模式对均匀腐蚀板极限强度预测影响的回归方程。
This paper presents the results of a parametric study of probabilistic modelling of the ultimate strength of ship plates with non-uniform corrosion represented by random fields. The load-shortening behaviour of the plates with non-uniform reduction of thickness due to corrosion under longitudinal compression is obtained using a general-purpose nonlinear finite element analysis program. A nonlinear time-dependent corrosion model is used to define the probabilistic characteristics of the random fields based on corrosion data measured in plate elements at different locations of bulk carriers. Based on the probabilistic models derived by Monte Carlo simulation, equations to predict the mean and the 5 % characteristic value of the ultimate strength of plates with non-uniform corrosion are developed. Finally a regression equation is proposed to take into account the effect of non-uniform corrosion patterns in the predictions of the ultimate strength of plates with uniform corrosion.