本文選題：壓印連接 + 有限元分析　； 參考：《昆明理工大學(xué)》2011年碩士論文

【摘要】：能源和環(huán)境問題是制約世界經(jīng)濟(jì)發(fā)展的瓶頸,節(jié)能減排是解決這些問題的重要途徑。為了減輕車身重量,新型材料(比如鋁合金)的應(yīng)用越來越廣泛。由于鋁具有高導(dǎo)熱性和鋁表面會(huì)形成天然氧化膜,很難用點(diǎn)焊進(jìn)行連接。所以,需要一種新的連接技術(shù)來連接這些輕型材料。壓印連接對于輕型材料的連接是一種簡單高效的連接方法。 本文主要運(yùn)用有限元方法和試驗(yàn)方法研究單搭壓印連接接頭的機(jī)械性能,包括靜態(tài)性能、動(dòng)態(tài)性能和疲勞性能。為了得到精確的仿真結(jié)果,采用ANSYS和FE-SAFE軟件進(jìn)行聯(lián)合仿真。 靜態(tài)分析和拉伸試驗(yàn)可以得出最大應(yīng)力出現(xiàn)的位置以及壓印連接接頭破壞的方式：頸部斷裂和底部剝離。靜力分析為疲勞分析提供節(jié)點(diǎn)的應(yīng)力應(yīng)變信息。模態(tài)分析主要研究了影響固有頻率的主要因素,固有頻率隨著楊氏模量的增長而顯著增加；而泊松比對固有頻率的影響很小。通過對模態(tài)振型的分析,可知橫向振動(dòng)的奇數(shù)振型關(guān)于兩板搭接位置對稱,并且搭接位置處在振型的峰值處；扭轉(zhuǎn)振型的偶數(shù)振型兩板搭接位置扭轉(zhuǎn)嚴(yán)重,所以搭接接頭的形狀非常重要,而且對單搭壓印連接結(jié)構(gòu)的動(dòng)態(tài)性能的影響很大。 本文以鋁合金2014-T6單搭壓印連接接頭的疲勞分析為例,敘述了ANSYS/FE-SAFE在疲勞分析中的應(yīng)用和一般的分析過程。通過對不同系列鋁合金壓印連接接頭的疲勞壽命對比,得出了鋁合金2014-T6的疲勞性能最好,其次是AL2024-T351和AL5456-H311。對比了異種板材不同組合接頭的疲勞性能,發(fā)現(xiàn)疲勞壽命相差很小。研究了表面粗糙度對疲勞壽命的影響,隨著表面粗糙度值的增大疲勞壽命隨之降低,并繪制了表面粗糙度與疲勞壽命關(guān)系曲線。研究了表面殘余應(yīng)力對疲勞壽命的影響,隨著表面殘余壓應(yīng)力的升高疲勞壽命隨之升高,表面殘余拉應(yīng)力會(huì)對疲勞性能產(chǎn)生不利影響。
[Abstract]:Energy and environment are the bottleneck restricting the development of world economy. Energy saving and emission reduction are the important ways to solve these problems. In order to reduce body weight, new materials (such as aluminum alloy) are more and more widely used. Due to the high thermal conductivity of aluminum and the formation of natural oxide film on aluminum surface, it is difficult to connect by spot welding. Therefore, a new connection technology is needed to connect these lightweight materials. Imprint bonding is a simple and efficient bonding method for light-duty materials. In this paper, finite element method and test method are used to study the mechanical properties, including static, dynamic and fatigue properties of single lap imprint joint. In order to obtain accurate simulation results, ANSYS and FE-SAFE software are used for joint simulation. Static analysis and tensile test can obtain the position of maximum stress and the failure mode of imprint joint: neck fracture and bottom peeling. Static analysis provides the stress and strain information for fatigue analysis. Modal analysis mainly studies the main factors affecting the natural frequency, which increases significantly with the increase of Young's modulus, while the Poisson's ratio has little effect on the natural frequency. Through the analysis of modal mode, it can be seen that the odd vibration mode of transverse vibration is symmetrical about the two plates' lap position, and the lap position is at the peak value of the mode, and the torsion of even number vibration mode of torsional mode is serious. So the shape of lap joint is very important and has great influence on the dynamic performance of single lap imprint joint. Taking the fatigue analysis of aluminum alloy 2014-T6 single-lap joint as an example, the application and general analysis process of ANSYS/FE-SAFE in fatigue analysis are described. By comparing the fatigue life of different series of aluminum alloy imprinted joints, it is concluded that the fatigue properties of aluminum alloy 2014-T6 are the best, followed by AL2024-T351 and AL5456-H311. The fatigue properties of different composite joints of dissimilar plates are compared and it is found that the difference of fatigue life is very small. The influence of surface roughness on fatigue life is studied. With the increase of surface roughness value, the fatigue life decreases, and the relationship between surface roughness and fatigue life is drawn. The influence of surface residual stress on fatigue life is studied. The fatigue life increases with the increase of surface residual compressive stress, and the surface residual tensile stress will have a negative effect on fatigue performance.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號(hào)】：TH131

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 黃志超;;板料連接技術(shù)進(jìn)展[J];鍛壓技術(shù);2006年04期

2 邵兵,白創(chuàng)明,楊得壽;壓鉚連接的成形原理及應(yīng)用[J];機(jī)械研究與應(yīng)用;2004年03期

3 韓向東,王存堂,雷玉成,何新峰;沖壓圓點(diǎn)連接機(jī)理初探[J];模具工業(yè);2001年09期

4 孫希延,李泉永,楊連發(fā);板料拉伸成形數(shù)值模擬中動(dòng)態(tài)接觸的處理[J];模具工業(yè);2002年08期

5 楊小寧;佟錚;趙麗萍;王建斌;敖英海;;金屬板件壓接數(shù)值模擬及模具設(shè)計(jì)[J];模具工業(yè);2006年10期

6 張金海;板件沖壓連接技術(shù)在汽車工業(yè)中的應(yīng)用[J];模具技術(shù);2004年01期

7 李曉靜;李曉雷;;汽車制造業(yè)中自沖鉚接的新型連接工藝初探[J];天津職業(yè)院校聯(lián)合學(xué)報(bào);2007年05期

8 韓向東 ,王存堂 ,雷玉成 ,何新峰;板料沖壓連接技術(shù)及其機(jī)理[J];新技術(shù)新工藝;2002年04期

9 劉亞麗,張益華;機(jī)械壓力連接參數(shù)與有限元模擬[J];機(jī)械制造與自動(dòng)化;2005年03期

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本文編號(hào)：1947109