本文關(guān)鍵詞：含缺陷厚壁壓力容器J積分計算方法及失效評定曲線方法研究　出處：《華東理工大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 厚壁壓力容器 全塑性解 J積分計算方法 失效評定曲線

【摘要】：厚壁壓力容器特別是大型的厚壁壓力容器長期承受高溫高壓和化學(xué)介質(zhì)的作用,在極端的工作條件下運行,屬于特種設(shè)備范疇之內(nèi)。而裂紋和缺陷的擴展是造成壓力容器事故的重要原因,因此結(jié)構(gòu)完整性評定是判斷壓力容器是否能夠安全運行最重要的內(nèi)容之一。而結(jié)構(gòu)完整性評定中的J積分工程估算方法和失效評定曲線技術(shù)是研究者們長期關(guān)注和研究的重要課題。作者基于上述關(guān)鍵技術(shù)展開了研究,主要包括以下內(nèi)容： 1.針對大型厚壁壓力容器,以內(nèi)壓作用下內(nèi)表面半橢圓裂紋厚壁圓筒為模型,利用ABAQUS軟件進(jìn)行了大量建模計算和比較,發(fā)現(xiàn)EPRI延性斷裂手冊全塑性解針對厚壁壓力容器的適用性較弱的問題。討論了全塑性解計算方法,重新給出大量的內(nèi)壓作用下內(nèi)表面半橢圓裂紋厚壁圓筒的全塑性解,補充了EPRI延性斷裂手冊內(nèi)容。 2.基于等效遠(yuǎn)場應(yīng)力法,給出了統(tǒng)一的J估算表達(dá)式和針對于厚壁壓力容器載荷比形式的n無關(guān)全塑性解系數(shù)x0手冊；針對等效遠(yuǎn)場應(yīng)力法只能用應(yīng)力形式計算J積分的問題,推導(dǎo)了基于載荷比形式x0解的J積分計算方法；驗證了載荷比形式x0的精度和本文中給出的J積分計算方法的有效性。 3.針對特定材料的大型厚壁壓力容器,文中以R6的選擇2失效評定曲線為基礎(chǔ),以R6的選擇3失效評定曲線為標(biāo)準(zhǔn),利用轉(zhuǎn)化應(yīng)力σTeff建立了基于載荷比形式x0解的失效評定曲線。該曲線無需通過J積分的計算,只需知道材料真應(yīng)力真應(yīng)變關(guān)系即可得到；不僅具有R6選擇3的精度和R6選擇2與結(jié)構(gòu)無關(guān)的特性,并且具有計算方法簡便的優(yōu)點,使文中的J積分計算方法提升到了實際工程應(yīng)用層面。
[Abstract]:Thick-walled pressure vessels, especially large thick-walled pressure vessels, operate under extreme working conditions under the action of high temperature and high pressure and chemical medium for a long time. It belongs to the category of special equipment, and the crack and defect propagation is the important cause of the accident of pressure vessel. Therefore, structural integrity assessment is one of the most important contents in judging whether the pressure vessel can operate safely. The J integral engineering estimation method and failure assessment curve technique in structural integrity assessment are concerned by researchers for a long time. The author has carried out the research based on the above key technologies. It mainly includes the following: 1. For a large thick-walled pressure vessel, a large number of modeling calculations and comparisons have been carried out by using ABAQUS software to model the inner surface semi-elliptical cracked thick wall cylinder under internal pressure. It is found that the full plastic solution of EPRI ductile fracture manual is weak for the applicability of thick-walled pressure vessel, and the calculation method of full plastic solution is discussed. The full plastic solution of the thick wall cylinder with semi-elliptic crack on the inner surface under a large amount of internal pressure is given again, which complements the EPRI ductile fracture manual. 2. Based on the equivalent far-field stress method, the unified J-estimation expression and the n-independent fully plastic solution coefficient x0 for the form of load ratio of thick-walled pressure vessel are given. In order to solve the problem that the equivalent far-field stress method can only calculate the J-integral in the form of stress, the J-integral calculation method based on the form of load ratio x _ 0 is derived. The accuracy of the load ratio form x0 and the validity of the J integral calculation method given in this paper are verified. 3. For large thick-walled pressure vessels with specific materials, this paper bases on the failure evaluation curve of choice 2 of R6 and takes the curve of failure assessment of choice 3 of R6 as the standard. The failure evaluation curve based on the form of load ratio x 0 is established by means of transformation stress 蟽 Teff. The curve does not need to be calculated by J integral, but only need to know the true strain relation of material true stress. Not only has the accuracy of R6 selection 3 and R6 selection 2 independent of the structure, but also has the advantage of simple calculation method, so the J integral calculation method in this paper has been raised to the practical engineering application level.
【學(xué)位授予單位】：華東理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH49

【參考文獻(xiàn)】

相關(guān)期刊論文 前6條

1 李承亮;張明乾;;壓水堆核電站反應(yīng)堆壓力容器材料概述[J];材料導(dǎo)報;2008年09期

2 鐘群鵬;李培寧;李學(xué)仁;陳鋼;;國家標(biāo)準(zhǔn)《在用含缺陷壓力容器安全評定》的特色和創(chuàng)新點綜述[J];管道技術(shù)與設(shè)備;2006年01期

3 劉俊;霍立興;張玉鳳;;SINTAP標(biāo)準(zhǔn)和BS 7910標(biāo)準(zhǔn)中FAD圖評定方法橫坐標(biāo)求解方法的比較及分析[J];焊接學(xué)報;2006年01期

4 魏東吼;鄭賢斌;;含缺陷油氣管道斷裂失效評定方法探討[J];石油規(guī)劃設(shè)計;2009年04期

5 ;壓力容器學(xué)會 化工機械與自動化學(xué)會 壓力容器缺陷評定規(guī)范CVDA—1984[J];壓力容器;1985年01期

6 王賓;荊洪陽;任曉波;;平面型缺陷斷裂評定的BS 7910標(biāo)準(zhǔn)簡介[J];壓力容器;2006年08期

，

本文編號：1427731