【摘要】：張拉載荷下導線的應力分布以及拉伸剛度的變化情況體現(xiàn)了導線的力學性能。本文采用理論計算方法、有限元仿真方法以及試驗測量方法,以LGJ-300/25型鋼芯鋁絞線固定端情況為例,對張拉載荷下導線的應力及剛度進行研究。理論計算部分,建立股線的受力平衡方程,得到張拉導線的載荷、應力分布情況以及截面拉伸剛度理論值;在此基礎上,考慮導線溫度變化對導線線材變形的影響,得出不同條件下溫度對導線應力、應變及載荷的影響。有限元仿真部分,利用導線的螺旋對稱特點,建立導線單股線模型,根據(jù)模型中相應節(jié)點的位移關系,建立節(jié)點組之間的約束方程,并根據(jù)約束方程施加邊界條件及載荷,從而縮小模型的計算規(guī)模,節(jié)約計算時間。試驗測量部分,根據(jù)鋼芯鋁絞線拉伸剛度的測量原理,設計安裝了導線拉伸試驗測量裝置,給出了拉伸剛度的具體試驗測量方法,完成了導線的拉伸試驗測量,并對試驗操作的過程進行了詳細的描述,得到導線的載荷-應變曲線。研究結果表明:(1)導線中心直鋼線與6根層鋼線為線接觸,接觸面積大,擠壓應力最小,其他各層股線之間的接觸區(qū)域為點接觸,擠壓應力由內(nèi)而外逐漸減小;導線橫截面上各層股線承受的載荷及應力呈現(xiàn)由內(nèi)而外減小趨勢;隨著導線溫度的升高,鋁股線承受的載荷相對減小,最內(nèi)層鋁股線的載荷及應力最先減小為零。(2)在拉伸載荷作用初期,導線截面拉伸剛度略微增加,隨著載荷增大,鋁股線發(fā)生塑性變形,導線截面拉伸剛度開始急劇減小。
[Abstract]:The stress distribution and tensile stiffness of conductors under tension load reflect the mechanical properties of conductors. In this paper, the stress and stiffness of conductors under tension load are studied by using theoretical calculation method, finite element simulation method and experimental measurement method, taking the fixed end of LGJ-300/ 25 steel core aluminum strand as an example. In the part of theoretical calculation, the stress balance equation of the strand is established, and the load, stress distribution and the theoretical value of the tensile stiffness of the section are obtained. On this basis, considering the influence of wire temperature change on wire rod deformation, the influence of temperature on conductor stress, strain and load under different conditions is obtained. In the finite element simulation part, according to the spiral symmetry characteristics of the conductor, the single strand model of the conductor is established. According to the displacement relationship of the corresponding nodes in the model, the constraint equation between the node groups is established, and the boundary conditions and loads are applied according to the constraint equation. Thus, the calculation scale of the model is reduced and the calculation time is saved. In the part of test and measurement, according to the measuring principle of tensile stiffness of steel core aluminum strand, a measuring device for conductor tensile test is designed and installed, the concrete test and measurement method of tensile stiffness is given, and the tensile test measurement of conductor is completed. The process of test operation is described in detail, and the load-strain curve of conductor is obtained. The results show that: (1) the straight wire in the center of the conductor is in contact with six steel wires, the contact area is large, the extrusion stress is the smallest, the contact area between the other strands is point contact, and the extrusion stress decreases gradually from inside to outside; The load and stress of each layer of strands on the cross section of the conductor show a decreasing trend from inside to outside. With the increase of conductor temperature, the load of aluminum strand decreases relatively, and the load and stress of innermost aluminum strand decrease to zero at first. (2) in the initial stage of tensile load, the tensile stiffness of conductor section increases slightly, and with the increase of load, The plastic deformation of aluminum strand occurs, and the tensile stiffness of wire section begins to decrease sharply.
【學位授予單位】：華北電力大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM751

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