光纤机械可靠性及寿命研究

发布时间：2018-07-11 18:21

本文选题：裂纹生长 + 动态疲劳　；参考：《武汉邮电科学研究院》2017年硕士论文

【摘要】：光纤通信相比电缆等具有较多优点,例如低损耗、大宽带、保密性好等,从而越来越多的得到应用。从我国第一批光缆敷设至今已有近25年时间,接近或基本达到通讯行业标准YD/T 769中规定的25年最短光缆使用寿命。因此,有必要对光缆的使用寿命的评估及延长技术进行研究。光纤是光缆中最重要的关键材料,要提高光缆的使用寿命,最根本的是要提高光纤可靠性。本论文选取光纤机械可靠性及寿命研究作为研究课题,主要内容可归纳如下:(1)研究了影响光纤机械可靠性的主要因素。具体研究了光纤裂纹生长理论、光纤疲劳断裂机理、疲劳参数及试验方法、光纤的零应力腐蚀现象及机理、涂层对光纤机械性能的影响。(2)结合影响光纤机械可靠性的因素,根据筛选试验筛选断裂点的频次、长度和使用应力的断裂概率,以及威布尔参数模型,建立了筛选实验模型预期光纤寿命。由该模型发现,威布尔参数m、疲劳指数n、及施加应变ε_a是光纤寿命评估较为敏感的参数。(3)测试及调研了影响光纤可靠性的主要参数。探究了光纤Nd值的两点弯曲和轴向张力两种测方法及其差异分析,此外探究了光纤m值的测试。(4)探究提高光纤机械可靠性方案。通过分析现有的光纤生产制造和施工工艺,研究改善疲劳指数n和施加应变ε_a途径,从而提高光纤可靠性。论文创新点在于:(1)借鉴光纤疲劳断裂机理,威布尔模型及筛选试验来建立光纤寿命预期模型,从而对光纤寿命进行评估。(2)对光纤动态疲劳参数两种测试方法进行差异分析。(3)综合考虑光纤n值及制造工艺,探究提高光纤机械可靠性方案,这在工程中均为具体可施的,对光纤制造、施工具有切实指导意义。
[Abstract]:Compared with cable, optical fiber communication has many advantages, such as low loss, large bandwidth, good confidentiality and so on. It has been nearly 25 years since the first batch of optical cables were laid in our country, which is close to or basically up to the minimum service life of 25 years stipulated in YD / T769, the standard of communication industry. Therefore, it is necessary to evaluate and extend the service life of optical cable. Optical fiber is the most important material in optical cable. To improve the service life of optical fiber cable, the most fundamental is to improve the reliability of optical fiber. The main contents of this thesis are summarized as follows: (1) the main factors affecting the mechanical reliability of optical fiber are studied. The theory of fiber crack growth, the fatigue fracture mechanism, fatigue parameters and test methods, the zero stress corrosion phenomenon and mechanism of fiber, the influence of coating on the mechanical properties of optical fiber are studied. (2) the factors influencing the mechanical reliability of optical fiber are combined. According to the frequency of the screening test, the fracture probability of the length and the use stress, and the Weibull parameter model, the life expectancy of the fiber was established. It is found from the model that Weibull parameter m, fatigue exponent n, and applied strain 蔚 A are sensitive parameters for fiber life evaluation. (3) the main parameters affecting the reliability of optical fiber are measured and investigated. In this paper, two measuring methods of fiber ND value, namely, two-point bending and axial tension, as well as their difference analysis are discussed. In addition, the measurement of optical fiber m value is explored. (4) the scheme of improving the mechanical reliability of optical fiber is explored. Based on the analysis of the existing manufacturing and construction technology of optical fiber, the fatigue index n and strain 蔚 a method are studied to improve the reliability of the fiber. The innovations of this paper are as follows: (1) the fatigue fracture mechanism of optical fiber, Weibull model and screening test are used to establish the model of fiber life expectancy. Therefore, the life of optical fiber is evaluated. (2) the difference between two testing methods of fiber dynamic fatigue parameters is analyzed. (3) considering the n value of optical fiber and manufacturing technology, the scheme of improving the mechanical reliability of optical fiber is explored, which is practical in engineering. It has practical guiding significance for optical fiber manufacture and construction.
【学位授予单位】：武汉邮电科学研究院
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TN818

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