本文關(guān)鍵詞：含缺陷厚壁壓力容器J積分計(jì)算方法及失效評(píng)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

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【摘要】：厚壁壓力容器特別是大型的厚壁壓力容器長(zhǎng)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(yùn)行,屬于特種設(shè)備范疇之內(nèi)。而裂紋和缺陷的擴(kuò)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(píng)定是判斷壓力容器是否能夠安全運(yùn)行最重要的內(nèi)容之一。而結(jié)構(gòu)完整性評(píng)定中的J積分工程估算方法和失效評(píng)定曲線技術(shù)是研究者們長(zhǎng)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(duì)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(jì)算和比較,發(fā)現(xiàn)EPRI延性斷裂手冊(cè)全塑性解針對(duì)厚壁壓力容器的適用性較弱的問題。討論了全塑性解計(jì)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(bǔ)充了EPRI延性斷裂手冊(cè)內(nèi)容。 2.基于等效遠(yuǎn)場(chǎng)應(yīng)力法,給出了統(tǒng)一的J估算表達(dá)式和針對(duì)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(cè)；針對(duì)等效遠(yuǎn)場(chǎng)應(yīng)力法只能用應(yīng)力形式計(jì)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(jì)算方法；驗(yàn)證了載荷比形式x0的精度和本文中給出的J積分計(jì)算方法的有效性。 3.針對(duì)特定材料的大型厚壁壓力容器,文中以R6的選擇2失效評(píng)定曲線為基礎(chǔ),以R6的選擇3失效評(píng)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(píng)定曲線。該曲線無需通過J積分的計(jì)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(jì)算方法簡(jiǎn)便的優(yōu)點(diǎn),使文中的J積分計(jì)算方法提升到了實(shí)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(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH49

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