本文選題：壓力管道 + 碳纖維布　； 參考：《西南科技大學(xué)》2015年碩士論文

【摘要】：壓力管道的腐蝕缺陷常分為內(nèi)腐蝕和外腐蝕,一般外腐蝕缺陷又分為:全面積均勻腐蝕、局部腐蝕、點蝕、組合腐蝕四類,而缺陷的主要形狀一般為方形或橢圓形。同時壓力管道常常含有沿軸向、沿環(huán)向、沿軸向和環(huán)向同時分布的多個點蝕缺陷,因其靠得太近會產(chǎn)生相互作用。非金屬纖維材料在結(jié)構(gòu)修復(fù)加固中的應(yīng)用逐漸廣泛,但是在修復(fù)含缺陷壓力管道尚屬起步階段,對其補強效果的評價仍處于探索階段,缺少評價準(zhǔn)則。本文主要研究碳纖維布加固含全面積均勻腐蝕缺陷以及橢圓形點蝕缺陷這兩類缺陷的壓力管道的補強效果,為實際的壓力管道加固工程提供一些參考性意見和建議。在全面積均勻腐蝕方向上,采用試驗和數(shù)值模擬兩種方法分別對其進行研究。且在數(shù)值模擬方法上采用“三維實體-接觸-殼元”有限元模型,反復(fù)斟酌后選擇合理單元類型,并基于基礎(chǔ)試驗得到相關(guān)參數(shù),然后使用這些基礎(chǔ)參數(shù)反過來完善模型,確保建模正確性。而試驗和數(shù)值模擬的結(jié)果又相互匹配,進一步間接驗證了建模的正確性。在點腐蝕方向上,采用數(shù)值模擬方法進行研究得到相關(guān)結(jié)論。結(jié)果表明:碳纖維布加固全面積均勻腐蝕缺陷壓力管道的補強效果出現(xiàn)邊際效益遞減的情況,整個加固區(qū)從中間到兩端滑移距離逐漸增大。單個橢圓形點蝕缺陷的管道缺陷形狀越尖銳、深度越深,則應(yīng)力集中系數(shù)越大、補強層數(shù)越多。壓力管道壁厚對應(yīng)力集中系數(shù)的影響主要是因為缺陷深度占管道壁厚的比例(深厚比)發(fā)生了變化。同時對比缺陷群的深度、軸向間距、環(huán)向間距對壓力管道應(yīng)力集中系數(shù)的影響,可知缺陷群深度對其影響最大,軸向間距次之,因此當(dāng)對含缺陷群壓力管道進行補強計算時主要考慮缺陷群深度和軸向間距對其的影響。
[Abstract]:The corrosion defects of pressure pipeline are usually divided into internal corrosion and external corrosion. The general external corrosion defects are divided into four categories: uniform corrosion of the whole area, local corrosion, pitting corrosion and combined corrosion, and the main shape of the defects is generally square or elliptical. At the same time pressure pipelines often contain multiple pitting defects distributed simultaneously along the axial circumferential axial and circumferential directions because they interact with each other when they are too close. The application of non-metallic fiber materials in structural repair and reinforcement is gradually widespread, but the repair of pressure pipes containing defects is still in the initial stage, the evaluation of its reinforcement effect is still in the exploratory stage, and the evaluation criteria are lacking. This paper mainly studies the reinforcement effect of carbon fiber sheet in strengthening pressure pipeline with uniform corrosion defects and elliptical pitting defects, and provides some reference opinions and suggestions for practical pressure pipeline strengthening projects. Both experimental and numerical simulation methods were used to study the uniform corrosion direction of the whole area. In the numerical simulation method, the finite element model of "three-dimensional solid contact shell element" is adopted, the reasonable element type is selected after repeated consideration, and the relevant parameters are obtained based on the basic test, and then the model is improved by using these basic parameters in turn. Make sure the modeling is correct. The results of experiments and numerical simulations match each other, which further indirectly verifies the correctness of the modeling. In the direction of pitting corrosion, the numerical simulation method is used to study the relevant conclusions. The results show that the reinforcement effect of uniform corrosion defect pressure pipeline strengthened by carbon fiber sheet decreases with the increasing of marginal benefit, and the slip distance from middle to both ends increases gradually. The more sharp the defect shape and the deeper the depth of the single elliptical pitting defect, the greater the stress concentration factor and the number of reinforcing layers. The influence of pressure pipe wall thickness on stress concentration factor is mainly due to the change of the ratio of defect depth to pipe wall thickness (depth ratio). At the same time, comparing the influence of depth of defect group, axial distance and circumferential spacing on stress concentration factor of pressure pipeline, it can be seen that the depth of defect group has the greatest influence on the stress concentration factor of pressure pipeline, and the axial spacing is the second. Therefore, the influence of defect group depth and axial spacing on the reinforcement of pressure pipes with defects is considered.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：U178

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本文編號：2096638