本文選題：矩形彎管 + 數(shù)值模擬��； 參考：《山東建筑大學(xué)》2015年碩士論文

【摘要】：管道運輸作為一種高效、廉價的運輸系統(tǒng),在國家生產(chǎn)建設(shè)過程中占據(jù)著重要地位,它廣泛地應(yīng)用于電力、冶金、化工、建筑、石油等工業(yè)領(lǐng)域。矩形截面彎管具有強度大、質(zhì)量輕等優(yōu)點,因此通常被用于輸送流體介質(zhì),它可以在保證強度的同時節(jié)省一定的材料,在汽車工業(yè)領(lǐng)域有著非常廣闊的應(yīng)用前景。矩形管的彎曲成形方式主要有兩種,種是在矩形管的寬面進(jìn)行加工彎曲,稱之為E彎；另一種是在矩形管的窄面進(jìn)行加工彎曲,稱之為H彎。在實際工程中,彎管在流體介質(zhì)的作用下,易受到不均勻壓力荷載作用而產(chǎn)生應(yīng)力集中現(xiàn)象。本文針對流體作用下矩形截面彎管內(nèi)壁面受力不均和彎管成形過程容易出現(xiàn)質(zhì)量缺陷等問題,開展了相關(guān)研究。主要通過Fluent研究矩形截面彎管內(nèi)流體流動的情況,以及采用ABAQUS建立矩形截面管彎曲成形的有限元模型,對矩形管材在不同彎曲程度時的應(yīng)力及應(yīng)變分布規(guī)律進(jìn)行分析研究,得出了流體作用下彎管內(nèi)壁面壓力的分布規(guī)律并擬合出了矩形彎管內(nèi)壁面凸凹邊的壓力公式以及管材彎曲成形過程中不同工藝參數(shù)變化對彎曲成形彎管件截面質(zhì)量的影響規(guī)律。所得的研究結(jié)果對流體作用下彎管內(nèi)壁面受力的準(zhǔn)確分析以及成形過程中工藝參數(shù)的選取具有重要意義。為此,本文主要做了以下工作：(1)通過三維建模軟件UG分別建立三種截面面積相等的矩形彎管(E彎、H彎、方形彎管),采用Fluent軟件分析比較不同截面形式下的彎管內(nèi)流體的流動狀況和彎管內(nèi)壁面的壓力值,得出矩形截面彎管E彎是承受壓力的最優(yōu)情況。(2)采用Fluent對不同工況下E彎矩形管內(nèi)壁面的壓力值進(jìn)行數(shù)值模擬,然后改變相關(guān)參數(shù)(流體入口流速、流體出口壓力、彎管度、流體密度等),研究參數(shù)變化對彎管內(nèi)壁面所受壓力分布規(guī)律的影響。分析影響參數(shù)與壓力差△P的關(guān)系,最終根據(jù)1stOpt擬合軟件擬合出彎管凸凹邊內(nèi)壁面壓力關(guān)于流體入口流速v、流體出口壓力P0、彎管彎曲度k、彎管的軸向角度α和流體介質(zhì)密度ρ變化的壓力公式。(3)采用有限元分析軟件ABAQUS,建立三維的矩形截面管材彎曲成形的有限元模型,通過仿真模擬得到管坯在不同彎曲程度時的應(yīng)力及應(yīng)變分布規(guī)律。深入分析了不同工藝參數(shù)變化對彎曲成形彎管件截面質(zhì)量的影響,對于改進(jìn)加工成形工藝、解釋成形中缺陷的產(chǎn)生、控制彎管件的成形質(zhì)量有著十分重要意義。
[Abstract]:As an efficient and cheap transportation system, pipeline transportation occupies an important position in the process of national production and construction. It is widely used in the fields of electric power, metallurgy, chemical industry, construction, petroleum and other industries. Rectangular section bends have the advantages of high strength and light mass, so they are usually used to transport fluid media, which can save some materials while ensuring strength, and have a very broad application prospect in automobile industry. There are two main bending methods of rectangular tube, one is machining bending on the wide surface of rectangular tube, which is called E bend, and the other is machining bending on the narrow surface of rectangular tube, which is called H bend. In practical engineering, the bending pipe is easy to be subjected to inhomogeneous pressure load under the action of fluid medium, which leads to stress concentration phenomenon. In order to solve the problems such as uneven force on the inner surface of rectangular section bend tube under the action of fluid and the easy appearance of mass defects in the forming process of the bend pipe, the relevant research has been carried out in this paper. The flow of fluid in rectangular bend tube is studied by Fluent, and the finite element model of rectangular section tube bending is established by ABAQUS. The distribution of stress and strain in rectangular tube with different bending degree is analyzed and studied. The distribution law of pressure on the inner wall of curved pipe under the action of fluid is obtained, and the pressure formula of the convex and concave edge on the inner wall of rectangular bend is fitted. The influence of different technological parameters on the cross section quality of bend tube in bending forming process of tube is also obtained. The results obtained are of great significance to the accurate analysis of the inner surface force of the curved pipe under the action of fluid and the selection of the technological parameters in the forming process. Therefore, the main work of this paper is as follows: 1) by using the 3D modeling software UG, three kinds of rectangular bend with equal cross-section area are established respectively. In this paper, the flow state of fluid and the pressure on the inner wall of the curved pipe are analyzed and compared by Fluent software. It is concluded that the E bend of rectangular section is the best case of bearing pressure. (2) numerical simulation of the pressure on the inner wall of the rectangular tube under different working conditions is carried out by using Fluent, and then the relevant parameters (fluid inlet velocity, fluid outlet pressure, bend degree) are changed. The influence of fluid density on the pressure distribution on the inner wall of curved pipe is studied. The relationship between influence parameters and pressure difference P is analyzed. Finally, according to the 1stOpt fitting software, the pressure on the inner wall of the convex and concave edge of the elbow is fitted with the pressure formula of fluid inlet velocity v, fluid outlet pressure P0, bend degree k, axial angle 偽 of the bend pipe and density 蟻 of the fluid medium. The finite element analysis software Abaqus is used to establish a three-dimensional finite element model of tube bending forming with rectangular section. The distribution of stress and strain of tube billet under different bending degree was obtained by simulation. The influence of different process parameters on the cross section quality of bending tube bending parts is deeply analyzed. It is of great significance to improve the forming process, explain the production of defects in the forming process and control the forming quality of the tube bending parts.
【學(xué)位授予單位】：山東建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TQ055.81

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