Abstract
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.
Highlights
Copper material with good corrosion resistance is widely used in a variety of harsh environments [1], but will still be affected by the inevitable seawater-active corrosion [2,3]
The time-variant reliability model of copper bending pipe under seawater-active corrosion is studied in order to provide a basis for improving the safety of seawater piping systems by reducing the failure caused by corrosion
It can be considered that the copper bending pipe is reliable when the limit strength is larger than the maximum stress, and the reliability calculated by the traditional method is subject to the extreme distribution of 0–1
Summary
Copper material with good corrosion resistance is widely used in a variety of harsh environments [1], but will still be affected by the inevitable seawater-active corrosion [2,3]. The copper bending pipe, which is applied in seawater piping systems, can change the direction of seawater flow. The impact of seawater-active corrosion and pressure on the copper bending pipe will lead to the degradation of the material properties, and leakage will occur. The time-variant reliability model of copper bending pipe under seawater-active corrosion is studied in order to provide a basis for improving the safety of seawater piping systems by reducing the failure caused by corrosion. The environment can adversely affect the mechanical behavior of material, and the copper bending pipe works in both the seawater environment and the atmospheric environment, simultaneously. Lin [7] and Hodgkiess [8] studied the corrosion behavior of copper material in seawater
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