本文選題：應(yīng)變線性化 + 當(dāng)量結(jié)構(gòu)應(yīng)變準(zhǔn)則��； 參考：《北京化工大學(xué)》2015年碩士論文

【摘要】：壓力容器的分析設(shè)計(DBA)作為規(guī)則設(shè)計(DBF)的并行設(shè)計方法越來越受到設(shè)計人員的重視,對于高溫、高壓容器或者規(guī)則設(shè)計所不能涵蓋的非標(biāo)設(shè)備,分析設(shè)計的使用尤為廣泛。防止壓力容器塑性垮塌失效是分析設(shè)計的重要任務(wù)之一,然而不同規(guī)范采用不同彈塑性分析方法。本論文通過數(shù)值分析的手段對六種重要彈塑性分析方法展開研究,主要包括以下內(nèi)容：1.簡要介紹歐盟EN13445-3標(biāo)準(zhǔn)附錄B中總體塑性變形設(shè)計校核及其應(yīng)用,通過對比二次外推法的兩種外推方式得出以下結(jié)論：按EN13445外推法計算時,應(yīng)首先將表面支點(diǎn)的應(yīng)變分量二次外推到熱點(diǎn)處,然后求熱點(diǎn)處的主結(jié)構(gòu)應(yīng)變。2.提出基于應(yīng)變線性化的主結(jié)構(gòu)應(yīng)變計算方法,根據(jù)建模方式的差異性對同一結(jié)構(gòu)確定六種計算結(jié)構(gòu)應(yīng)變的方法,通過對比分析六種方法的計算結(jié)果得出：應(yīng)變線性化方法與二次外推法所得結(jié)果偏差最小；應(yīng)變線性化方法可以計算壓力容器構(gòu)件中任何位置的結(jié)構(gòu)應(yīng)變,包括二次外推法無法使用的情況。3.與EN13445直接法使用的最大主結(jié)構(gòu)應(yīng)變準(zhǔn)則相對應(yīng),提出可以用于總體塑性變形校核的最大當(dāng)量結(jié)構(gòu)應(yīng)變準(zhǔn)則,該準(zhǔn)則更適用于壓力容器常用的韌性材料。4.實(shí)現(xiàn)了零曲率準(zhǔn)則的程序化并給定了載荷——應(yīng)變或者載荷——變形(P-w)曲線上零曲率點(diǎn)的判據(jù),可以準(zhǔn)確快速地判斷P-w曲線上某點(diǎn)是否為零曲率點(diǎn)或者確定零曲率點(diǎn)在曲線上的位置,從而可以使用載荷-抗力系數(shù)法進(jìn)行設(shè)計校核。5.通過對典型結(jié)構(gòu)進(jìn)行極限分析和彈塑性分析,對比六種彈塑性分析方法得出：零曲率準(zhǔn)則為確定極限載荷的最佳準(zhǔn)則；垮塌載荷和極限載荷確定許用載荷大小關(guān)系與結(jié)構(gòu)的幾何強(qiáng)化特性相關(guān),故可以選擇兩者的較小值作為結(jié)構(gòu)的最終許用載荷。
[Abstract]:Analysis and design of pressure vessels (DBA) is paid more and more attention by designers as a concurrent design method of regular design. It is widely used in analysis and design of high temperature, high pressure vessels or non-standard equipments that cannot be covered by regulation design. To prevent plastic collapse failure of pressure vessel is an important part of analysis and design, however, different methods of elastic-plastic analysis are used in different codes. In this paper, six important elastoplastic analysis methods are studied by means of numerical analysis, including the following contents: 1: 1. This paper briefly introduces the overall plastic deformation design verification and its application in Appendix B of EU EN13445-3 Standard. By comparing the two extrapolation methods of the quadratic extrapolation method, the following conclusions are drawn: when calculating with the EN13445 extrapolation method, First, the strain component of the surface fulcrum should be extrapolated to the hot spot, and then the strain of the main structure at the hot spot should be obtained. In this paper, a strain calculation method based on strain linearization is proposed. According to the difference of modeling methods, six methods for calculating the strain of the same structure are determined. By comparing and analyzing the results of the six methods, it is concluded that the strain linearization method has the least deviation from the quadratic extrapolation method, and the strain linearization method can calculate the structural strain at any position in the pressure vessel member. Including the second extrapolation method can not be used. 3. Corresponding to the maximum principal structure strain criterion used by EN13445 direct method, the maximum equivalent strain criterion, which can be used to check the total plastic deformation, is proposed. The criterion is more suitable for the ductile materials commonly used in pressure vessels. The program of zero curvature criterion is realized and the criterion of zero curvature point on load-strain or load-deformation P-w) curve is given. It can accurately and quickly judge whether a point on P-w curve is a zero curvature point or determine the position of zero curvature point on the curve, so the load-resistance coefficient method can be used to design and check. 5. Through limit analysis and elastic-plastic analysis of typical structures, six elastoplastic analysis methods are compared: zero curvature criterion is the best criterion for determining limit load; The relationship between the allowable load and the collapse load and the limit load are related to the geometric strengthening characteristics of the structure, so we can choose the smaller value of them as the final allowable load of the structure.
【學(xué)位授予單位】：北京化工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TH49

【參考文獻(xiàn)】

相關(guān)期刊論文 前2條

1 李楠;王海峰;桑芝富;;內(nèi)壓作用下斜接管容器塑性極限載荷的數(shù)值研究[J];機(jī)械設(shè)計與制造;2007年08期

2 薛麗萍,林楊杰,桑芝富,張?jiān)旅?圓柱殼大開孔結(jié)構(gòu)極限載荷的試驗(yàn)研究[J];壓力容器;2000年02期

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本文編號：1855277