本文選題：復(fù)合材料　切入點(diǎn)：缺陷氣瓶　出處：《華南理工大學(xué)》2015年碩士論文

【摘要】：鋼內(nèi)膽環(huán)纏繞氣瓶具有輕質(zhì)、高強(qiáng)度、耐腐蝕及生產(chǎn)成本低等優(yōu)點(diǎn)而廣泛用于汽車(chē)行業(yè)。然而在使用過(guò)程中，氣瓶容易產(chǎn)生不同的缺陷，影響氣瓶使用安全。缺陷主要分為兩類(lèi)：一是內(nèi)膽缺陷，主要來(lái)源于充裝氣體不符合要求而產(chǎn)生的腐蝕性缺陷和反復(fù)加載產(chǎn)生的疲勞缺陷；二是纏繞層缺陷，主要是由于摩擦、劃傷等外界因素造成的缺陷。本文主要對(duì)內(nèi)膽和纏繞層缺陷展開(kāi)研究，考慮了三個(gè)位置缺陷（內(nèi)膽中部、纏繞層中部、纏繞層端部），兩種缺陷尺度（深度和長(zhǎng)度）。首先考慮缺陷單獨(dú)出現(xiàn)在內(nèi)膽中部?jī)?nèi)壁面，然后在其基礎(chǔ)上，同時(shí)考慮出現(xiàn)在纏繞層的情況，最終得到本文研究的三種缺陷模型（內(nèi)膽中部存在缺陷模型、內(nèi)膽和纏繞層中部存在缺陷模型、內(nèi)膽中部和纏繞層端部存在缺陷模型）。 本文利用ANSYS建立了無(wú)缺陷和有缺陷3D氣瓶模型，研究工作狀態(tài)下應(yīng)力分布，，然后采用設(shè)定路徑分量疊加的方法得到軟件無(wú)法直接得到的缺陷氣瓶工作狀態(tài)下的實(shí)際應(yīng)力、應(yīng)力強(qiáng)度、等效應(yīng)力和界面應(yīng)力等分布，比較分析不同位置缺陷和尺寸對(duì)氣瓶強(qiáng)度性能的影響。 參照分析設(shè)計(jì)標(biāo)準(zhǔn)中疲勞分析的方法，計(jì)算不同余壓和缺陷尺寸下氣瓶的疲勞壽命，比較不同缺陷位置、余壓、缺陷深度和長(zhǎng)度對(duì)疲勞壽命的影響：結(jié)果發(fā)現(xiàn)，相同余壓下，缺陷位于筒體中部（僅內(nèi)膽中部缺陷或者內(nèi)膽和纏繞層中部存在缺陷）時(shí)，缺陷深度存在一臨界值，在臨界值以?xún)?nèi)氣瓶疲勞壽命與缺陷深度無(wú)關(guān)，而超過(guò)臨界值，缺陷深度將直接決定氣瓶的疲勞壽命；纏繞層端部缺陷對(duì)疲勞壽命的影響與端部無(wú)缺陷時(shí)的變化趨勢(shì)完全不同，此時(shí)疲勞壽命隨缺陷深度的增大而減小。爆破和疲勞試驗(yàn)進(jìn)一步驗(yàn)證了模擬和疲勞分析結(jié)果的合理性和準(zhǔn)確性。分析還尋找到了氣瓶最大環(huán)向應(yīng)力和疲勞壽命與余壓和不同位置缺陷尺寸的變化規(guī)律，比較了不同缺陷模型對(duì)氣瓶疲勞壽命的影響；擬合了缺陷氣瓶?jī)?nèi)膽外壁上最大環(huán)向應(yīng)力和疲勞壽命與余壓和缺陷深度的關(guān)系，為缺陷氣瓶壽命預(yù)測(cè)提供了一種評(píng)估方法。
[Abstract]:Steel tank ring winding gas cylinders are widely used in automobile industry due to their advantages of light weight, high strength, corrosion resistance and low production cost. However, gas cylinders are prone to produce different defects in the process of use. The defects are mainly divided into two categories: one is the inner bile defect, which mainly comes from the corrosive defect caused by the filling gas which does not meet the requirements and the fatigue defect caused by repeated loading; the other is the wound layer defect, which is mainly caused by friction, The defects caused by external factors, such as scratches, are studied in this paper, and three defects are considered: the middle of the inner bile, the middle of the winding layer, the middle of the winding layer, the middle of the winding layer, and the defect of the winding layer. At the end of the winding layer, there are two kinds of defect scales (depth and length). First, it is considered that the defect appears separately on the inner wall of the middle part of the inner bile, then on its basis, and at the same time, the case of the winding layer is taken into account. Finally, three kinds of defect models (the middle of the inner bile duct, the middle of the inner bile and the winding layer, the defect model of the middle of the inner bile and the end of the winding layer) are obtained. In this paper, ANSYS is used to establish the model of non-defect and defect-free 3D gas cylinder. The stress distribution in working state is studied, and then the actual stress in the working state of defective gas cylinder can not be directly obtained by using the method of setting path component superposition. The distribution of stress intensity, equivalent stress and interfacial stress were compared and analyzed, and the effects of defects and sizes of different positions on the strength properties of gas cylinders were compared and analyzed. Referring to the fatigue analysis method in the analytical design standard, the fatigue life of gas cylinder under different residual pressure and defect size is calculated, and the effects of different defect location, residual pressure, defect depth and length on fatigue life are compared. When the defect is located in the middle of the tube (only in the middle of the inner bile or in the middle of the inner tank and winding layer), there is a critical value in the depth of the defect, within which the fatigue life of the cylinder is independent of the depth of the defect but exceeds the critical value. The depth of defect will directly determine the fatigue life of gas cylinder, and the effect of wound end defect on fatigue life is completely different from the change trend of the end without defect. At the same time, the fatigue life decreases with the increase of defect depth. Blasting and fatigue tests further verify the rationality and accuracy of the simulation and fatigue analysis results. The maximum circumferential stress, fatigue life and fatigue life of gas cylinder are also found. The variation of residual pressure and defect size in different positions, The effects of different defect models on the fatigue life of gas cylinders are compared, and the relationship between the maximum circumferential stress and fatigue life, residual pressure and defect depth on the inner and outer wall of the defective gas cylinders is fitted, which provides an evaluation method for the life prediction of defective gas cylinders.
【學(xué)位授予單位】：華南理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TQ053.2;TB33

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