【摘要】：準(zhǔn)確預(yù)測(cè)含軸向穿透裂紋管道極限壓力對(duì)其安全運(yùn)行具有重要意義,但現(xiàn)有極限壓力預(yù)測(cè)模型已不滿足高韌性、高強(qiáng)度X80管道的評(píng)定需求。對(duì)含軸向穿透裂紋X80管道極限壓力進(jìn)行研究,建立含軸向穿透裂紋X80管道殼單元與三維實(shí)體單元數(shù)值模型,應(yīng)用殼單元模型替代三維實(shí)體單元模型以簡(jiǎn)化分析過程并提高計(jì)算效率�；诤鸭y管道殼單元模型,選用臨界裂紋尖端張開角作為斷裂參量,分析初始裂紋長度、檢測(cè)單元長度、管道壁厚等不同因素對(duì)極限壓力的影響,提出極限壓力預(yù)測(cè)修正模型。將基于修正模型的管道爆破壓力預(yù)測(cè)結(jié)果與試驗(yàn)測(cè)試結(jié)果進(jìn)行對(duì)比分析。結(jié)果表明,初始裂紋長度與極限壓力呈負(fù)相關(guān)關(guān)系;而檢測(cè)單元長度和管道壁厚與極限壓力呈正相關(guān)關(guān)系,且壁厚與極限壓力基本呈近線性關(guān)系;三者均對(duì)極限壓力具有較為顯著的影響。該模型具有更高的準(zhǔn)確性,可用于高韌性、高強(qiáng)度薄壁X80管道的止裂設(shè)計(jì)。
[Abstract]:Accurate prediction of the ultimate pressure of pipeline with axial penetration crack is of great significance for its safe operation, but the existing prediction models of ultimate pressure no longer meet the assessment requirements of high toughness and high strength X80 pipeline. The ultimate pressure of X80 pipeline with axial penetrating crack is studied, and the numerical model of shell element and three-dimensional solid element of X80 pipeline with axial penetrating crack is established. The shell element model is used to replace the three-dimensional solid element model to simplify the analysis process and improve the computational efficiency. Based on the shell element model of pipe with cracks, the critical crack tip opening angle is selected as the fracture parameter to analyze the influence of different factors, such as initial crack length, detection element length and pipe wall thickness, on the ultimate pressure. A modified model for prediction of limit pressure is proposed. The prediction results of pipeline blasting pressure based on the modified model and the test results are compared and analyzed. The results show that the initial crack length is negatively correlated with the ultimate pressure, while the detection element length and the pipe wall thickness have a positive correlation with the ultimate pressure, and the wall thickness is almost linear with the ultimate pressure. All of them have a significant effect on the ultimate pressure. The model is more accurate and can be used for crack arrest design of thin wall X80 pipe with high toughness and strength.
【作者單位】： 中國石油大學(xué)儲(chǔ)運(yùn)與建筑工程學(xué)院;中國石油大學(xué)山東省油氣儲(chǔ)運(yùn)安全重點(diǎn)實(shí)驗(yàn)室;機(jī)械結(jié)構(gòu)強(qiáng)度與振動(dòng)國家重點(diǎn)實(shí)驗(yàn)室;中國石化勝利石油工程有限公司鉆井工藝研究院;中國石油遼河油田分公司特種油開發(fā)公司;
【基金】：國家自然科學(xué)基金項(xiàng)目(11472309) 國家重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(2016YFC0802306) 中央高�；究蒲袠I(yè)務(wù)資助項(xiàng)目(14CX02208A) 國家重點(diǎn)實(shí)驗(yàn)室開放課題(SV2017-KF-02)
【分類號(hào)】：TE973

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