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An advanced technique to predict time-dependent corrosion damage of onshore, offshore, nearshore and ship structures: Part I = generalisation
International Journal of Naval Architecture and Ocean Engineering ( IF 2.2 ) Pub Date : 2020-08-24 , DOI: 10.1016/j.ijnaoe.2020.06.007
Do Kyun Kim , Eileen Wee Chin Wong , Nak-Kyun Cho

A reliable and cost-effective technique for the development of corrosion damage model is introduced to predict nonlinear time-dependent corrosion wastage of steel structures. A detailed explanation on how to propose a generalised mathematical formulation of the corrosion model is investigated in this paper (Part I), and verification and application of the developed method are covered in the following paper (Part II) by adopting corrosion data of a ship’s ballast tank structure. In this study, probabilistic approaches including statistical analysis were applied to select the best fit probability density function (PDF) for the measured corrosion data. The sub-parameters of selected PDF, e.g., the largest extreme value distribution consisting of scale, and shape parameters, can be formulated as a function of time using curve fitting method. The proposed technique to formulate the refined time-dependent corrosion wastage model (TDCWM) will be useful for engineers as it provides an easy and accurate prediction of the 1) starting time of corrosion, 2) remaining life of the structure, and 3) nonlinear corrosion damage amount over time. In addition, the obtained outcome can be utilised for the development of simplified engineering software shown in Appendix B.



中文翻译:

一种预测陆上,近海,近岸和船舶结构随时间变化的腐蚀破坏的先进技术:第一部分=概括

介绍了一种可靠且具有成本效益的腐蚀损伤模型开发技术,以预测钢结构的非线性时效腐蚀损耗。本文研究了关于如何提出腐蚀模型的广义数学公式的详细解释(第一部分),并在下文(第二部分)中通过采用船舶腐蚀数据来验证了所开发方法的验证和应用。压载舱结构。在这项研究中,采用包括统计分析在内的概率方法,为测量的腐蚀数据选择最佳拟合概率密度函数(PDF)。可以使用曲线拟合方法将选定PDF的子参数(例如,由比例尺和形状参数组成的最大极值分布)表达为时间的函数。拟定的精细化的随时间变化的腐蚀损耗模型(TDCWM)的技术将对工程师有用,因为它为1)腐蚀的开始时间,2)结构的剩余寿命和3)非线性提供了简单而准确的预测随着时间的流逝腐蚀破坏的数量。此外,获得的结果可用于附录B中所示的简化工程软件的开发。

更新日期:2020-08-24
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