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  本文關(guān)鍵詞：內(nèi)壓和彎曲聯(lián)合作用下鋼絲纏繞增強塑料復合管力學性能研究　出處：《浙江大學》2017年碩士論文　論文類型：學位論文

  更多相關(guān)文章： 鋼絲纏繞增強塑料復合管 內(nèi)壓 彎曲 極限彎矩 抗彎剛度

【摘要】：鋼絲纏繞增強塑料復合管(簡稱PSP)是一種新型的復合管道。它是以高密度聚乙烯(簡稱HDPE)為基體材料,以高強度的鋼絲左右纏繞成網(wǎng)狀骨架為增強體,用高性能的熱熔膠將鋼絲和HDPE緊密地粘結(jié)在一起。PSP結(jié)合了鋼絲的高強度和HDPE耐腐蝕的特性,被廣泛地應(yīng)用在海洋、石油、化工和市政等領(lǐng)域。PSP應(yīng)用在海洋條件時將受到復雜載荷的作用,除了受內(nèi)壓作用,還會受到墜落物撞擊、船只拖網(wǎng)、拋錨拖曳和波浪沖擊等彎曲載荷作用,并受溫度等因素的影響。因此內(nèi)壓和彎曲是海洋工況中典型的組合載荷,當組合載荷超過PSP的承載能力時,PSP將發(fā)生失效,并造成經(jīng)濟損失和生態(tài)破壞。而過往研究中僅分別對PSP承載內(nèi)壓和彎曲進行了相關(guān)研究,沒有考慮到PSP承受兩者聯(lián)合作用的情況,且尚無復雜載荷條件的試驗裝備。因此內(nèi)壓和彎曲聯(lián)合作用下PSP的力學性能研究很有必要,對PSP的安全應(yīng)用和工程設(shè)計具有十分重要的意義。本文在國家自然基金"基于粘彈性損傷模型的聚乙烯管材慢速裂紋擴展機理研究"(項目編號:51575480)和"聚乙烯管道電熔焊接接頭超聲檢測特征線的形成機理研究"(項目編號:51305394)的支持下，，對內(nèi)壓和彎曲聯(lián)合作用下PSP的力學性能進行試驗和有限元研究,主要完成的工作如下:(1)針對海洋復雜載荷條件和聚乙烯溫度相關(guān)、率相關(guān)的材料特性,提出試驗裝備的功能:裝備可對試樣管施加內(nèi)壓和彎曲載荷,并能控制溫度和彎曲速率;根據(jù)功能要求設(shè)計裝備的結(jié)構(gòu),分別從機械結(jié)構(gòu)、液壓回路和測試系統(tǒng)方面進行設(shè)計;機械結(jié)構(gòu)方面,實現(xiàn)將試樣管自動移到水箱內(nèi)的過程;液壓回路方面,分別設(shè)計液壓回路以實現(xiàn)多功能彎曲加載;測試系統(tǒng)方面,通過估算確定加載油缸的最大載荷等參數(shù);根據(jù)設(shè)計方案組裝和搭建試驗裝備;裝備的設(shè)計方案獲國家發(fā)明專利授權(quán)。(2)開展室溫下(20℃)PSP的內(nèi)壓和彎曲組合載荷試驗,試樣管失效前發(fā)出密集鋼絲斷裂聲,最后試樣管破裂并噴射出大量水;將破口處的外層HDPE剖開,可看到10根鋼絲發(fā)生了斷裂,將鋼絲斷裂作為PSP的失效判據(jù);根據(jù)彎矩-位移曲線圖可知彎矩呈先增大后減小的趨勢,得出極限彎矩和失效位移;通過計算內(nèi)壓降低率以表征PSP在彎曲過程中體積增大的程度;開展其他不同溫度下(40℃和60℃)PSP的內(nèi)壓和彎曲組合載荷試驗,得到不同溫度下PSP的極限彎矩、失效位移和內(nèi)壓降低率,結(jié)果顯示:溫度越高,則極限彎矩越低、失效位移越小,而內(nèi)壓降低率基本不變。(3)根據(jù)試驗加載和接觸條件建立PSP有限元模型;比較試驗和有限元的彎矩-位移曲線,兩者平均相對誤差為4.4%,從而驗證有限元模型;計算不同加載位移下的抗彎剛度,結(jié)合彎矩-位移曲線,分析PSP在不同階段下的彎曲過程,得出極限彎矩;根據(jù)HDPE和鋼絲的應(yīng)力云圖并結(jié)合試驗結(jié)論,將鋼絲斷裂作為PSP模型的失效判據(jù),計算PSP失效時的曲率;分別計算僅受內(nèi)壓作用、僅受彎曲作用和內(nèi)壓彎曲聯(lián)合作用下鋼絲的應(yīng)變,分析組合載荷之間的關(guān)系;分別計算不同溫度和內(nèi)壓下的極限彎矩,擬合二元線性回歸方程;討論鋼絲根數(shù)和纏繞角度對極限彎矩的影響;分別建立不同工作壓力規(guī)格和不同管徑的X70鋼管、X80鋼管和PSP有限元模型,討論不同類型管道的抗彎能力。PSP抗彎能力的分析和影響因素的討論對管道參數(shù)設(shè)計和工程應(yīng)用有指導意義。
[Abstract]:Plastic pipe reinforced by winding steel wire (PSP) is a new composite pipe. It is based on high density polyethylene (HDPE) as the base material, with high strength steel wire wound around into mesh skeleton for reinforcement, hot melt adhesive of high performance steel and HDPE tightly bonded together.PSP characteristics a combination of high strength and corrosion resistance of HDPE steel, widely used in petroleum chemical industry, marine,.PSP application and municipal areas will be subject to complex loads in marine conditions, in addition to the role of inner pressure, but also by the impact of falling objects, boats trawl, drag anchor role and wave impact bending load. And under the influence of temperature and other factors. Therefore, internal pressure and bending load is a combination of typical marine conditions, when the bearing capacity of the combined load of more than PSP, PSP will fail, and cause economic loss and ecological damage. While in the past the study Only for PSP bearing internal pressure and bending are studied, without taking into account the PSP under the combined action of both conditions, test equipment and no complex load conditions. So the research on the combined effect of internal pressure and bending mechanical properties of PSP is necessary and has very important significance for engineering and design of PSP safety. Based on the National Natural Science Foundation "research based on slow propagation mechanism of polyethylene pipe crack of viscoelastic damage model" (project number: 51575480) and polyethylene pipe electric fusion welded joint ultrasonic detection feature line formation mechanism research "(project number: 51305394) under the support of the test and finite element mechanics the performance of internal pressure and bending under the joint action of PSP, the main work is as follows: (1) according to the marine complex loading condition and polyethylene temperature, ratio of material properties related to the proposed test equipment Function: equipped on the sample tube Shijianei pressure and bending load, and can control the temperature and bending rate; according to the design requirements of equipment structure and function, respectively, from the mechanical structure, hydraulic circuit and test system is designed; the mechanical structure, the sample tube from moving to the water tank; hydraulic loop respectively, the design of hydraulic circuit to realize the multi function loading bending; test system, loading cylinder parameters such as maximum load is determined by estimating the assembly and test equipment; design scheme according to the design scheme of the equipment; won the national invention patents. (2) carried out at room temperature (20 C) PSP internal pressure and bending combined load test specimen tube failure issued before intensive wire breakage, finally the sample tube rupture and ejected a lot of water; will break at the outer HDPE open, can see the 10 wire fracture occurred, the steel wire fracture As the failure criterion of PSP; according to the displacement curve of bending moment increases, the ultimate bending moment and displacement failure; through the calculation of internal pressure to reduce the rate of characterization of PSP in the bending process volume increased; carry out other at different temperatures (40 C and 60 C) and the internal pressure of PSP bending combined load test, ultimate bending moment of PSP under different temperatures, the displacement and internal pressure reducing failure rate, results showed that: the higher the temperature is, the lower limit moment, failure displacement is smaller, and the reduction of the internal pressure ratio basically unchanged. (3) according to the test load and contact conditions to establish finite element model of PSP; displacement curve moment comparison test and the finite element method, the average relative error is 4.4%, so as to verify the finite element model; stiffness calculation of different loading displacement under bending moment, combined with the displacement curve, analysis of the bending process of PSP in different stages, the very The limit bending moment; according to the HDPE steel and the stress nephogram and the test results, the wire breakage as the failure criterion of the PSP model, the calculation of curvature PSP failure; were calculated only by the internal pressure, bending and internal pressure only by the combined action of bending strain of steel wire, analysis of the relationship between the combined load respectively; to calculate the ultimate bending moment of different temperature and pressure, fitting two element linear regression equation; discussing the effect of the number of the steel wire and the winding angle on the ultimate moment; work pressure were built in different specifications and different diameters of the X70 steel, X80 steel and PSP finite element model, and discussed the impact of different types of pipe bending capacity of.PSP bending capacity factor discussion of pipeline parameter design and engineering application significance.

【學位授予單位】：浙江大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TB333

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