本文選題：CNG氣瓶 + 多尺度建模��； 參考：《浙江理工大學》2017年碩士論文

【摘要】：CNG-2型氣瓶是由鋼制內(nèi)膽和外部的纏繞層復合材料組成。氣瓶在自緊工藝中纏繞層會出現(xiàn)一定程度的樹脂開裂,并在充放氣的過程中產(chǎn)生環(huán)向裂紋,這樣使得纏繞層復合材料在外界酸性環(huán)境中更容易被腐蝕。使用過程中氣瓶內(nèi)部要保持一定的壓力,高壓作用下使得纏繞層具有一定的內(nèi)應力,在應力和腐蝕共同作用下使得纏繞層產(chǎn)生應力腐蝕裂紋。氣瓶纏繞層復合材料是一種單向纖維復合材料,傳統(tǒng)研究氣瓶力學的方法是將氣瓶纏繞層力學性質(zhì)看做是一種連續(xù)均勻的材料,通過宏觀力學分析的方法進行研究。但在氣瓶工作壓力下,纏繞層的屈服極限、斷裂強度均遠遠大于其所受到的應力,通過宏觀力學并不能對纏繞層樹脂開裂及應力腐蝕裂紋的產(chǎn)生機理進行深入研究。針對這一問題,本文首先分別對新出廠氣瓶和由于纏繞層應力腐蝕裂紋而報廢的氣瓶的纏繞層進行取樣,然后通過掃描電子顯微鏡(SEM)觀察復合材料纖維和基體的破壞形式。根據(jù)掃描電鏡拍攝的氣瓶纏繞層復合材料破壞形式提出一種氣瓶多尺度建模的方法。利用所提出的多尺度模型,首先通過微觀力學的方法探討氣瓶纏繞層的含膠量和纖維直徑這兩大重要設計參數(shù)對樹脂開裂程度的影響,并對環(huán)向裂紋對應力腐蝕裂紋擴展的影響進行了研究;然后在所建立的多尺度模型基礎對纖維引入破壞層研究了應力腐蝕裂紋的破壞機理。本文結(jié)合復合材料微觀力學的研究方法對氣瓶纏繞層的應力損傷機理進行了研究,實驗表明氣瓶多尺度模型在氣瓶仿真分析中是切實可行的。同時提出氣瓶纏繞層樹脂開裂的影響因素以及應力腐蝕裂紋的破壞機理,這對CNG-2型氣瓶的纏繞層的設計、纏繞張力等都提供了很好的理論參考。
[Abstract]:CNG-2 gas cylinder is composed of steel inner tank and outer winding layer composite material. In the process of self-tightening, the winding layer of the gas cylinder will have a certain degree of resin cracking, and a ring crack will occur in the process of gas filling and discharging, which makes the composite material of the winding layer more easily corroded in the external acidic environment. It is necessary to maintain a certain pressure in the gas cylinder during the operation. Under the action of high pressure, the winding layer has certain internal stress, and the stress corrosion crack occurs in the winding layer under the combined action of stress and corrosion. The composite material of gas cylinder winding layer is a kind of unidirectional fiber composite material. The traditional method of studying cylinder mechanics is to regard the mechanical properties of gas cylinder winding layer as a kind of continuous and uniform material, and to study it by means of macroscopic mechanical analysis. However, under the working pressure of gas cylinder, the yield limit and fracture strength of the winding layer are far greater than the stress of the winding layer. The mechanism of the cracking and stress corrosion cracking of the winding layer resin can not be deeply studied through macroscopic mechanics. In order to solve this problem, the winding layer of the newly manufactured gas cylinder and the gas cylinder which was abandoned due to the stress corrosion cracking in the winding layer were sampled respectively, and then the failure modes of the composite fiber and matrix were observed by scanning electron microscope (SEM). A multi-scale modeling method of gas cylinder was proposed according to the destruction mode of composite material of gas cylinder winding layer taken by scanning electron microscope (SEM). By using the proposed multi-scale model, the influence of two important design parameters, the rubber content and the fiber diameter, on the cracking degree of the resin is discussed by means of micromechanics. The influence of circumferential crack on stress corrosion crack propagation is studied, and the failure mechanism of stress corrosion crack is studied on the basis of multi-scale model. In this paper, the stress damage mechanism of gas cylinder winding layer is studied by means of micromechanics of composite materials. The experimental results show that the multi-scale model of gas cylinder is feasible in the simulation analysis of gas cylinder. At the same time, the influence factors of gas cylinder winding layer resin cracking and the failure mechanism of stress corrosion cracking are put forward, which provides a good theoretical reference for the design and winding tension of CNG-2 gas cylinder winding layer.
【學位授予單位】：浙江理工大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH49

【參考文獻】

相關(guān)期刊論文 前10條

1 王夢月;;我國LNG水路運輸市場的發(fā)展建議[J];水運管理;2016年07期

2 王震;劉明明;郭海濤;;中國能源清潔低碳化利用的戰(zhàn)略路徑[J];天然氣工業(yè);2016年04期

3 元世海;李彥虎;祖磊;張桂明;;纖維纏繞車載CNG氣瓶的結(jié)構(gòu)設計及其有限元分析[J];玻璃鋼/復合材料;2015年12期

4 李斌;於秋霞;熊姝濤;方羽虎;;CNG-2型氣瓶用玻璃纖維增強材料耐腐蝕性能分析[J];壓力容器;2015年01期

5 謝志剛;陳小芹;;車用CNG2氣瓶金屬內(nèi)膽低周疲勞行為分析[J];工業(yè)安全與環(huán)保;2014年05期

6 鄭津洋;李靜媛;黃強華;歐可升;趙永志;劉鵬飛;;車用高壓燃料氣瓶技術(shù)發(fā)展趨勢和我國面臨的挑戰(zhàn)[J];壓力容器;2014年02期

7 由宏新;馬凱;李斌;;CNG-Ⅱ復合氣瓶環(huán)纏繞層表面缺陷安全性分析與評價方法[J];壓力容器;2013年10期

8 王海博;孫文宇;單衛(wèi)國;;2013年中國天然氣市場年中回顧與展望[J];國際石油經(jīng)濟;2013年10期

9 魯建霞;茍惠芳;;有限元法的基本思想與發(fā)展過程[J];機械管理開發(fā);2009年02期

10 郭宗華,周儉明,吳祚平;壓縮天然氣汽車的特點[J];煤氣與熱力;2004年02期

，

本文編號：2102697