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Open AccessArticle

A Time-Variant Reliability Model for Copper Bending Pipe under Seawater-Active Corrosion Based on the Stochastic Degradation Process

School of Reliability and Systems Engineering, Beihang University, Beijing 100191, China
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Materials 2018, 11(4), 507; https://doi.org/10.3390/ma11040507
Received: 1 March 2018 / Revised: 25 March 2018 / Accepted: 25 March 2018 / Published: 27 March 2018
In the degradation process, the randomness and multiplicity of variables are difficult to describe by mathematical models. However, they are common in engineering and cannot be neglected, so it is necessary to study this issue in depth. In this paper, the copper bending pipe in seawater piping systems is taken as the analysis object, and the time-variant reliability is calculated by solving the interference of limit strength and maximum stress. We did degradation experiments and tensile experiments on copper material, and obtained the limit strength at each time. In addition, degradation experiments on copper bending pipe were done and the thickness at each time has been obtained, then the response of maximum stress was calculated by simulation. Further, with the help of one kind of Monte Carlo method we propose, the time-variant reliability of copper bending pipe was calculated based on the stochastic degradation process and interference theory. Compared with traditional methods and verified by maintenance records, the results show that the time-variant reliability model based on the stochastic degradation process proposed in this paper has better applicability in the reliability analysis, and it can be more convenient and accurate to predict the replacement cycle of copper bending pipe under seawater-active corrosion. View Full-Text
Keywords: time-variant reliability; stochastic degradation process; copper bending pipe; seawater-active corrosion time-variant reliability; stochastic degradation process; copper bending pipe; seawater-active corrosion
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MDPI and ACS Style

Sun, B.; Liao, B.; Li, M.; Ren, Y.; Feng, Q.; Yang, D. A Time-Variant Reliability Model for Copper Bending Pipe under Seawater-Active Corrosion Based on the Stochastic Degradation Process. Materials 2018, 11, 507.

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