本文選題：鋁鋰合金　切入點(diǎn)：T型自沖鉚接頭　出處：《昆明理工大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：自沖鉚接技術(shù)作為一種冷成型的方法其工程應(yīng)用極其廣泛。本論文選擇自沖鉚接技術(shù)為研究對(duì)象,以現(xiàn)今發(fā)展?jié)摿薮蟮匿X鋰合金1420、8090及鈦合金TA1為主要連接基板,對(duì)其T型自沖鉚接性能進(jìn)行研究。文中具體工作可以分以下幾個(gè)方面。以1420鋁鋰合金T型自沖鉚接頭為主要研究對(duì)象,借助鋁鋰合金1420同種搭接及其與銅合金H62、不銹鋼410異種搭接的方式詳細(xì)地介紹了T型接頭的制備過(guò)程,并通過(guò)拉伸-剝離試驗(yàn)對(duì)接頭在剝離過(guò)程中的靜強(qiáng)度、能量吸收、失效形式及其機(jī)理進(jìn)行了比較分析。另外,還設(shè)置了一組鋁鋰合金1420單搭接頭進(jìn)行相關(guān)的比較分析。在拉-拉循環(huán)加載下對(duì)上述三組T型自沖鉚接頭進(jìn)行疲勞試驗(yàn),獲得這三組接頭的疲勞壽命曲線等信息并分析三組接頭的疲勞強(qiáng)度。文章還通過(guò)宏觀與微觀兩個(gè)層面對(duì)接頭的失效形式及其機(jī)理作了詳細(xì)的分析。疲勞斷口宏觀分析表明隨著加載降低,接頭薄弱環(huán)節(jié)有由鉚釘向板材轉(zhuǎn)移的趨勢(shì)。斷口微觀分析結(jié)果表明裂紋萌生區(qū)為較平坦的準(zhǔn)解理,裂紋瞬斷區(qū)為較突出的沿晶或韌窩特征。對(duì)微動(dòng)的研究發(fā)現(xiàn)其跟所受載荷、材料組合、材料性能和內(nèi)應(yīng)力有關(guān)。以鋁鋰合金8090同種及其與銅合金H62、鈦合金TA1異種組合的T型自沖鉚接頭為主要研究對(duì)象,對(duì)該組接頭的力學(xué)性能、能量吸收性能及相關(guān)失效形式進(jìn)行分析。制作8090鋁鋰合金與鍍鋅鋼正反組合的T型接頭,以分析鉚釘不同刺穿方向?qū)宇^力學(xué)性能及失效形式的影響。為了研究自沖鉚-粘接復(fù)合連接技術(shù)在T型結(jié)構(gòu)中的應(yīng)用,本文還對(duì)8090鋁鋰合金的自沖鉚-粘接復(fù)合連接的接頭成形質(zhì)量、力學(xué)性能與粘接劑、板材組合及模具的關(guān)系進(jìn)行研究。為拓展T型自沖鉚接頭的材料應(yīng)用領(lǐng)域,本文還針對(duì)鈦合金TA1的T型自沖鉚接頭進(jìn)行了相關(guān)研究。
[Abstract]:Self-punching riveting technology is widely used in engineering as a kind of cold forming method. In this paper, self-punching riveting technology is chosen as the research object, taking the Al-Li alloy 1420 / 8090 and titanium alloy TA1 as the main connection substrate, which has great development potential nowadays. The performance of T-type self-punching riveting is studied. The concrete work in this paper can be divided into the following aspects. Taking 1420 Al-Li alloy T-type self-punching riveting head as the main research object, With the aid of Al-Li alloy 1420 allograft and its dissimilar splicing with copper alloy H62and stainless steel 410, the preparation process of T-type joint is introduced in detail, and the static strength and energy absorption of the joint in the process of peeling are studied by tensile peeling test. In addition, a group of Al-Li alloy 1420 single lap joints were set up to carry out the relative comparative analysis. The fatigue tests of the above three groups of T-type self-impact riveting heads were carried out under pull-pull cyclic loading. The fatigue life curve of the three groups of joints was obtained and the fatigue strength of the three groups of joints was analyzed. The failure form and mechanism of the joints were also analyzed in detail through macroscopic and microscopic aspects. The analysis shows that as the load decreases, The fracture microanalysis results show that the crack initiation zone is a flat quasi-cleavage, and the crack transient fracture zone is a prominent intergranular or dimple feature. Material combination, material properties and internal stress. The mechanical properties of Al-Li alloy 8090 and its T-type self-impact riveting head combined with copper alloy H62and titanium alloy TA1 were studied. The energy absorption properties and related failure modes were analyzed. The T-shaped joints with the combination of 8090 Al-Li alloy and galvanized steel were made. In order to study the effect of different piercing directions of rivets on mechanical properties and failure modes of joints, the application of self-impact rivet-bonding composite connection technology in T-type structure was studied. In order to expand the material application field of T-type self-impact riveting riveting head, this paper also studies the joint forming quality, mechanical properties, adhesive agent, sheet combination and die of the self-impact rivet-bonding composite connection of 8090 Al-Li alloy, in order to expand the material application field of T-type self-impact riveting head. The T-type self-impact riveting head of titanium alloy TA1 is also studied in this paper.
【學(xué)位授予單位】：昆明理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TG938

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本文編號(hào)：1627537