發(fā)布時(shí)間：2018-07-11 18:21

  本文選題：裂紋生長 + 動(dòng)態(tài)疲勞��； 參考：《武漢郵電科學(xué)研究院》2017年碩士論文

【摘要】：光纖通信相比電纜等具有較多優(yōu)點(diǎn),例如低損耗、大寬帶、保密性好等,從而越來越多的得到應(yīng)用。從我國第一批光纜敷設(shè)至今已有近25年時(shí)間,接近或基本達(dá)到通訊行業(yè)標(biāo)準(zhǔn)YD/T 769中規(guī)定的25年最短光纜使用壽命。因此,有必要對(duì)光纜的使用壽命的評(píng)估及延長技術(shù)進(jìn)行研究。光纖是光纜中最重要的關(guān)鍵材料,要提高光纜的使用壽命,最根本的是要提高光纖可靠性。本論文選取光纖機(jī)械可靠性及壽命研究作為研究課題,主要內(nèi)容可歸納如下:(1)研究了影響光纖機(jī)械可靠性的主要因素。具體研究了光纖裂紋生長理論、光纖疲勞斷裂機(jī)理、疲勞參數(shù)及試驗(yàn)方法、光纖的零應(yīng)力腐蝕現(xiàn)象及機(jī)理、涂層對(duì)光纖機(jī)械性能的影響。(2)結(jié)合影響光纖機(jī)械可靠性的因素,根據(jù)篩選試驗(yàn)篩選斷裂點(diǎn)的頻次、長度和使用應(yīng)力的斷裂概率,以及威布爾參數(shù)模型,建立了篩選實(shí)驗(yàn)?zāi)Ｐ皖A(yù)期光纖壽命。由該模型發(fā)現(xiàn),威布爾參數(shù)m、疲勞指數(shù)n、及施加應(yīng)變?chǔ)臺(tái)a是光纖壽命評(píng)估較為敏感的參數(shù)。(3)測(cè)試及調(diào)研了影響光纖可靠性的主要參數(shù)。探究了光纖Nd值的兩點(diǎn)彎曲和軸向張力兩種測(cè)方法及其差異分析,此外探究了光纖m值的測(cè)試。(4)探究提高光纖機(jī)械可靠性方案。通過分析現(xiàn)有的光纖生產(chǎn)制造和施工工藝,研究改善疲勞指數(shù)n和施加應(yīng)變?chǔ)臺(tái)a途徑,從而提高光纖可靠性。論文創(chuàng)新點(diǎn)在于:(1)借鑒光纖疲勞斷裂機(jī)理,威布爾模型及篩選試驗(yàn)來建立光纖壽命預(yù)期模型,從而對(duì)光纖壽命進(jìn)行評(píng)估。(2)對(duì)光纖動(dòng)態(tài)疲勞參數(shù)兩種測(cè)試方法進(jìn)行差異分析。(3)綜合考慮光纖n值及制造工藝,探究提高光纖機(jī)械可靠性方案,這在工程中均為具體可施的,對(duì)光纖制造、施工具有切實(shí)指導(dǎo)意義。
[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.
【學(xué)位授予單位】：武漢郵電科學(xué)研究院
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TN818

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